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WO2009068736A1 - Surface-mountable permanent magnet element - Google Patents

Surface-mountable permanent magnet element Download PDF

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Publication number
WO2009068736A1
WO2009068736A1 PCT/FI2008/050673 FI2008050673W WO2009068736A1 WO 2009068736 A1 WO2009068736 A1 WO 2009068736A1 FI 2008050673 W FI2008050673 W FI 2008050673W WO 2009068736 A1 WO2009068736 A1 WO 2009068736A1
Authority
WO
WIPO (PCT)
Prior art keywords
permanent magnet
base plate
groove
magnet element
planar surface
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/FI2008/050673
Other languages
French (fr)
Inventor
Pauli Santala
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Neorem Magnets Oy
Original Assignee
Neorem Magnets Oy
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Neorem Magnets Oy filed Critical Neorem Magnets Oy
Priority to EP08855424.1A priority Critical patent/EP2215702A4/en
Publication of WO2009068736A1 publication Critical patent/WO2009068736A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F7/00—Magnets
    • H01F7/02—Permanent magnets [PM]
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F7/00—Magnets
    • H01F7/02—Permanent magnets [PM]
    • H01F7/0205—Magnetic circuits with PM in general
    • H01F7/0221—Mounting means for PM, supporting, coating, encapsulating PM
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/22—Rotating parts of the magnetic circuit
    • H02K1/27—Rotor cores with permanent magnets
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/22—Rotating parts of the magnetic circuit
    • H02K1/27—Rotor cores with permanent magnets
    • H02K1/2706—Inner rotors
    • H02K1/272—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis
    • H02K1/274—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets
    • H02K1/2753—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets the rotor consisting of magnets or groups of magnets arranged with alternating polarity
    • H02K1/278—Surface mounted magnets; Inset magnets

Definitions

  • the invention relates to a permanent magnet element as defined in the preamble of claim 1.
  • Permanent magnet elements are used secured to the rotor of permanent magnet machines, such as elec- trie motors and generators, to provide the required magnetic field.
  • the types of permanent magnet elements used in the permanent magnet machines include both ones embedded in the rotor and ones which are surface- mountable onto the periphery.
  • This disclosure relates to surface-mountable permanent magnet elements.
  • the elements should be magnetable without the risk of breakage and, when magnetized, easily mountable onto the peripheral surface of the rotor in files and/or rows.
  • the permanent magnet element should be protected against corrosion as efficiently as possible by coating and encasing against outside air.
  • the element should hold both tangential and radial mechanical stress, which is why the magnets should be locked, in addition to the magnetic grip, in place as reliably as possible, either mechanically only or mechanically and by gluing.
  • a surface-mountable permanent magnet element which is intended to be mounted onto the pe- riphery of the rotor of a permanent magnet machine as the polar element.
  • the permanent magnet element comprises at least one permanent magnet and a protective case enclosing said at least one permanent magnet.
  • the protective case comprises a base plate which comprises a securing member for securing the base plate to the rotor.
  • the base plate comprises a base surface which can be placed against the periphery of the rotor, a top surface on which said at least one permanent magnet is arranged, and at least one lateral surface which extends substantially perpendicularly between the base surface and the top surface.
  • the lateral surface comprises a recess.
  • the protective case further comprises a housing formed from a metal thin sheet material.
  • the housing comprises a top wall which covers the permanent magnet, and a skirt which extends from the top wall over the lateral wall of the base plate.
  • the skirt comprises a joint member, which in the WO- publication is a projection formed from the ' skirt and pressed inside the recess to secure the housing and the base plate to each other in such manner that the joint is within the outer dimensions of the element, which is preferred so that the elements can be disposed in file and/or row as close to each other as possible.
  • the projection which is pressed inside the recess provides stress resistance which is sufficient in many applications for maintaining the coherence of the element .
  • the radial and tangential stresses applied to the permanent magnet element become quite high, even if the rotating speed was relatively low (in the order of 16 to 20 r/min) . In the course of time, this may weaken the coherence, compactness and corrosion resistance of the parts of the element.
  • the air gap between the stationary stator and the rotating rotor is typically in the order of 1 mm, so it is obvious that the joint between the housing and the base plate cannot be allowed to become loose. In requiring high operational reliability with high confidence coefficient, the strength of the joint is a critical factor.
  • the objective of the invention is to eliminate the drawbacks referred to above.
  • the objective of the invention is to disclose a permanent magnet element in which the joint between the housing and the base plate has been further improved.
  • the objective of the invention is to disclose a strong and compact permanent magnet element with good corrosion resistance.
  • the objective of the invention is to disclose a permanent magnet element which is simple in construction, affordable and easily assembled.
  • the permanent magnet element according to the invention is characterized by what has been presented in claim 1.
  • the recess is a groove which extends substantially over the entire length of the lateral surface of the base plate.
  • the joint member is formed by bending the edge of the skirt of the housing inside the groove over a substantial portion of the total length of the skirt.
  • the edge of the skirt of the housing which is bent inside the groove extending substantially over the entire width of the lateral surface and which is almost equal in length locks the housing and the base plate to each other tightly and efficiently in such manner that they are not able to detach from each other during static and dynamic long-term stress.
  • the permanent magnet element is strong, compact, simple in construction, affordable, easily assembled and has good corrosion resistance.
  • the groove is limited by a first planar surface which is disposed at an angle to the lateral surface of the base plate, the first planar surface facing a first direction.
  • the groove is further limited by a second planar surface facing a second direction which is substantially opposite to the first direction.
  • the bending of the skirt inside the groove comprises a first flange which is parallel to the first planar surface and rests against the first planar sur- face.
  • the bending of the skirt inside the groove comprises a second flange which is disposed at an angle to the first flange.
  • the second flange is prefera- bly held in compressive stress against the second planar surface.
  • the free edge of the second flange rests against the second planar surface, further ensuring the strength of the joint.
  • This is preferably provided in such manner that the bending is formed by compressing, i.e. deep drawing, the edge of the skirt inside the groove.
  • the first planar surface and the second planar surface are parallel to each other and spaced at a distance from each other.
  • the first planar surface and the second planar surface are disposed at a right angle to the lateral surface.
  • the groove is rectangular in cross-section. In one embodiment of the permanent magnet element, the first planar surface and the second planar surface are disposed at such angle to the lateral surface that deviates from the right angle. In one embodiment of the permanent magnet element, the groove is a V-groove.
  • the groove is in the form of a parallelogram or trapezoid in cross-section. In one embodiment of the permanent magnet element, the groove is a dovetail.
  • the point of connection of the second planar surface and the lateral surface comprises a formation inside the groove, such as a ridge, protuberance or the like, fitted to ensure that the bending inside the groove stays in the groove.
  • the base plate and the housing are in the form of a parallelepiped.
  • the base plate is rectangular, whereby it comprises four lateral surfaces with the groove formed in each one of them.
  • the skirt of the housing comprises four planar skirt portions wherein the bendings inside the groove are formed.
  • the base plate is made from a ferromagnetic material and the housing is made from a non-magnetic material.
  • FIG. 1 schematically presents a rotor of a permanent magnet machine with a set of permanent magnet elements according to one embodiment of the invention mounted onto the periphery thereof
  • Fig. 2 presents the rotor of Fig. 1 as seen from direction II-II of Fig. 1,
  • Fig. 3 axonometrically presents a permanent magnet element according to one embodiment of the invention as seen from the top, Fig. 4 shows section IV-IV of Fig. 3,
  • Fig. 5 to 7 present a detail of the permanent magnet element according to one embodiment of the invention and steps of bending the skirt bending into the groove by deep drawing, Fig. 8 to 10 present, correspondingly to Fig.
  • Fig. 1 and 2 schematically present an example of a permanent magnet electric machine, such as a motor or generator, wherein the periphery of the rotor 2 comprises in four adjacent files parallel to the pe- riphery a large number of surface-mounted permanent magnet elements 1 disposed side by side and close to each other.
  • Fig. 3 and 4 present one such surface- mountable permanent magnet element 1. It comprises at least one permanent magnet 3 or a number of permanent magnets 3 side by side, and a protective case 4 enclosing the permanent magnet/s 3.
  • the protective case 4 comprises a base plate 5 made from a ferromagnetic material, such as steel, and having on the base a se- curing member 6, shown in Fig. 4, i.e. in this case a closed hole provided with threading, in which a secur- ing bolt can be threaded to secure the base plate to the rotor 2.
  • the base plate comprises a base surface 7 which can be placed against the periphery of the rotor 2.
  • the base plate 5 further comprises a top surface 8 on which the permanent magnet 3 is arranged.
  • the base plate 5 is a rectangular parallelepiped with four lateral surfaces 9 which extend perpendicularly between the base surface 7 and the top surface 12. As seen in Fig. 3 and 4, straight grooves 10 have been formed on the lateral surfaces 9 and they extend over the entire width of the lateral surface 9.
  • the protective case further comprises a housing 11 formed from a non-magnetic metal thin sheet material.
  • the housing 11 comprises a top wall 12 which covers the permanent magnet 3.
  • Extending from the top wall 12 over the lateral surfaces 9 of the base plate 5 are skirts 13.
  • the lower edge of the skirt 13 comprises as a joint member 14 a bending 15 of the skirt 13 inside the groove 10 to secure the housing 11 and the base plate 5 to each other.
  • Fig. 5 to 10 present different groove forms 10 and correspondingly different forms of the bendings 15 of the skirt 13.
  • the groove 10 is rectangular in cross-section, whereby the upper first planar surface 16 and the lower second planar surface 17 which limit the groove 10 in the vertical direction are parallel to each other and spaced at a distance s from each other and at a right angle to the lateral surface 9 of the base plate.
  • the bending 15 comprises a first flange 18 which is parallel to the first planar surface 16 and rests against the first planar surface, and a second flange 19 which is disposed at an angle to the first flange 18.
  • the bending 15 is formed ac- cording to Fig.
  • Fig. 7 also shows that at the same time, a formation 20, such as a ridge, protuberance or the like, is formed by a clenching tool inside the groove 10 to the point of connection of the second planar surface 17 and the lateral surface 9 to ensure that the bending 15 stays in the groove 10.
  • the first planar surface 16 and the second planar surface 17 are dis- posed at such angle to the lateral surface 9 which deviates from the right angle, and the groove 10 is V- shaped in cross-section.
  • the first flange 16 forms an obtuse angle to the lateral surface 9 and rests against the upper first planar surface 16.
  • the first planar surface 16 and the second planar surface 17 are disposed at such angle to the lateral surface 9 which deviates from the right angle, but the groove 10 is here a dovetail.
  • the groove 10 is trapezoidal in cross-section and the first planar surface 16 and the second planar surface 17 which are parallel to each other and spaced at a distance s from each other are disposed at a skew angle to the lateral surface 9.
  • the grooves 10 according to Fig. 5 to 7, 8 and 10 are easily and quickly made by a rotating flange blade.
  • the dovetail 10 of Fig. 9 has to be made by end milling, which is somewhat slower.
  • the invention is not limited merely to the exemplifying embodiments referred to above; instead, many variations are possible within the scope of the inventive idea defined by the claims.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Permanent Field Magnets Of Synchronous Machinery (AREA)

Abstract

A surface-mountable permanent magnet element (1) to be mounted onto the periphery of the rotor (2) of a permanent magnet machine as the polar element. The permanent magnet element (1) comprises at least one permanent magnet (3) and a protective case (4) enclosing said at least one permanent magnet. The protective case comprises a base plate (5) comprising a securing member (6) for securing the base plate to the rotor (2). The base plate comprises a base surface (7) which can be placed against the periphery of the rotor (2), a top surface (8) on which said at least one permanent magnet is arranged, and at least one lateral surface (9) which extends substantially perpendicularly between the base surface and the top surface. The lateral surface comprises a recess (10). The protective case further comprises a housing (11) formed from a metal thin sheet material, the housing comprising a top wall (12) which covers the permanent magnet (3), and a skirt (13) which extends from the top wall over the lateral surface (9) of the base plate, the skirt comprising a joint member (14) fitted in co-operation with the recess (10) to secure the housing (11) and the base plate (5) to each other. The recess (10) is a groove which extends substantially over the entire length of the lateral surface (9) of the base plate (5). The joint member (14) is formed by the bending (15) of the edge of the skirt (13) inside the groove (10) over a substantial portion of the total length of the skirt.

Description

SURFACE-MOUNTABLE PERMANENT MAGNET ELEMENT
FIELD OF THE INVENTION
The invention relates to a permanent magnet element as defined in the preamble of claim 1.
BACKGROUND OF THE INVENTION
Permanent magnet elements are used secured to the rotor of permanent magnet machines, such as elec- trie motors and generators, to provide the required magnetic field. The types of permanent magnet elements used in the permanent magnet machines include both ones embedded in the rotor and ones which are surface- mountable onto the periphery. This disclosure relates to surface-mountable permanent magnet elements. The elements should be magnetable without the risk of breakage and, when magnetized, easily mountable onto the peripheral surface of the rotor in files and/or rows. The permanent magnet element should be protected against corrosion as efficiently as possible by coating and encasing against outside air. The element should hold both tangential and radial mechanical stress, which is why the magnets should be locked, in addition to the magnetic grip, in place as reliably as possible, either mechanically only or mechanically and by gluing.
Previously known from publication WO 2007/116118 Al is a surface-mountable permanent magnet element which is intended to be mounted onto the pe- riphery of the rotor of a permanent magnet machine as the polar element. The permanent magnet element comprises at least one permanent magnet and a protective case enclosing said at least one permanent magnet. The protective case comprises a base plate which comprises a securing member for securing the base plate to the rotor. The base plate comprises a base surface which can be placed against the periphery of the rotor, a top surface on which said at least one permanent magnet is arranged, and at least one lateral surface which extends substantially perpendicularly between the base surface and the top surface. The lateral surface comprises a recess. The protective case further comprises a housing formed from a metal thin sheet material. The housing comprises a top wall which covers the permanent magnet, and a skirt which extends from the top wall over the lateral wall of the base plate. The skirt comprises a joint member, which in the WO- publication is a projection formed from the ' skirt and pressed inside the recess to secure the housing and the base plate to each other in such manner that the joint is within the outer dimensions of the element, which is preferred so that the elements can be disposed in file and/or row as close to each other as possible. The projection which is pressed inside the recess provides stress resistance which is sufficient in many applications for maintaining the coherence of the element .
For example in very large generator applications, such as wind power generators, in which the permanent magnet elements are mounted onto the periphery of a rotor having the diameter in the order of meters, the radial and tangential stresses applied to the permanent magnet element become quite high, even if the rotating speed was relatively low (in the order of 16 to 20 r/min) . In the course of time, this may weaken the coherence, compactness and corrosion resistance of the parts of the element. The air gap between the stationary stator and the rotating rotor is typically in the order of 1 mm, so it is obvious that the joint between the housing and the base plate cannot be allowed to become loose. In requiring high operational reliability with high confidence coefficient, the strength of the joint is a critical factor.
OBJECTIVE OF THE INVENTION The objective of the invention is to eliminate the drawbacks referred to above.
Specifically, the objective of the invention is to disclose a permanent magnet element in which the joint between the housing and the base plate has been further improved.
Further, the objective of the invention is to disclose a strong and compact permanent magnet element with good corrosion resistance.
In addition, the objective of the invention is to disclose a permanent magnet element which is simple in construction, affordable and easily assembled.
SUMMARY OF THE INVENTION The permanent magnet element according to the invention is characterized by what has been presented in claim 1.
According to the invention, the recess is a groove which extends substantially over the entire length of the lateral surface of the base plate. The joint member is formed by bending the edge of the skirt of the housing inside the groove over a substantial portion of the total length of the skirt.
The advantage of the invention is that the edge of the skirt of the housing which is bent inside the groove extending substantially over the entire width of the lateral surface and which is almost equal in length locks the housing and the base plate to each other tightly and efficiently in such manner that they are not able to detach from each other during static and dynamic long-term stress. A further advantage is that the permanent magnet element is strong, compact, simple in construction, affordable, easily assembled and has good corrosion resistance. In one embodiment of the permanent magnet element, the groove is limited by a first planar surface which is disposed at an angle to the lateral surface of the base plate, the first planar surface facing a first direction. The groove is further limited by a second planar surface facing a second direction which is substantially opposite to the first direction. The bending of the skirt inside the groove comprises a first flange which is parallel to the first planar surface and rests against the first planar sur- face.
In one embodiment of the permanent magnet element, the bending of the skirt inside the groove comprises a second flange which is disposed at an angle to the first flange. The second flange is prefera- bly held in compressive stress against the second planar surface. In other words, the free edge of the second flange rests against the second planar surface, further ensuring the strength of the joint. This is preferably provided in such manner that the bending is formed by compressing, i.e. deep drawing, the edge of the skirt inside the groove.
In one embodiment of the permanent magnet element, the first planar surface and the second planar surface are parallel to each other and spaced at a distance from each other.
In one embodiment of the permanent magnet element, the first planar surface and the second planar surface are disposed at a right angle to the lateral surface. In one embodiment of the permanent magnet element, the groove is rectangular in cross-section. In one embodiment of the permanent magnet element, the first planar surface and the second planar surface are disposed at such angle to the lateral surface that deviates from the right angle. In one embodiment of the permanent magnet element, the groove is a V-groove.
In one embodiment of the permanent magnet element, the groove is in the form of a parallelogram or trapezoid in cross-section. In one embodiment of the permanent magnet element, the groove is a dovetail.
In one embodiment of the permanent magnet element, the point of connection of the second planar surface and the lateral surface comprises a formation inside the groove, such as a ridge, protuberance or the like, fitted to ensure that the bending inside the groove stays in the groove.
In one embodiment of the permanent magnet element, the base plate and the housing are in the form of a parallelepiped.
In one embodiment of the permanent magnet element, the base plate is rectangular, whereby it comprises four lateral surfaces with the groove formed in each one of them. Correspondingly, the skirt of the housing comprises four planar skirt portions wherein the bendings inside the groove are formed.
In one embodiment of the permanent magnet element, the base plate is made from a ferromagnetic material and the housing is made from a non-magnetic material.
LIST OF FIGURES
In the following section, the invention will be described in detail by means of exemplifying em- bodiments, with reference to the accompanying drawing in which Fig. 1 schematically presents a rotor of a permanent magnet machine with a set of permanent magnet elements according to one embodiment of the invention mounted onto the periphery thereof, Fig. 2 presents the rotor of Fig. 1 as seen from direction II-II of Fig. 1,
Fig. 3 axonometrically presents a permanent magnet element according to one embodiment of the invention as seen from the top, Fig. 4 shows section IV-IV of Fig. 3,
Fig. 5 to 7 present a detail of the permanent magnet element according to one embodiment of the invention and steps of bending the skirt bending into the groove by deep drawing, Fig. 8 to 10 present, correspondingly to Fig.
7, various forms of grooves and bendings in different embodiments of the permanent magnet element according to the invention.
DETAILED DESCRIPTION OF THE INVENTION
Fig. 1 and 2 schematically present an example of a permanent magnet electric machine, such as a motor or generator, wherein the periphery of the rotor 2 comprises in four adjacent files parallel to the pe- riphery a large number of surface-mounted permanent magnet elements 1 disposed side by side and close to each other.
Fig. 3 and 4 present one such surface- mountable permanent magnet element 1. It comprises at least one permanent magnet 3 or a number of permanent magnets 3 side by side, and a protective case 4 enclosing the permanent magnet/s 3. The protective case 4 comprises a base plate 5 made from a ferromagnetic material, such as steel, and having on the base a se- curing member 6, shown in Fig. 4, i.e. in this case a closed hole provided with threading, in which a secur- ing bolt can be threaded to secure the base plate to the rotor 2. The base plate comprises a base surface 7 which can be placed against the periphery of the rotor 2. The base plate 5 further comprises a top surface 8 on which the permanent magnet 3 is arranged. The base plate 5 is a rectangular parallelepiped with four lateral surfaces 9 which extend perpendicularly between the base surface 7 and the top surface 12. As seen in Fig. 3 and 4, straight grooves 10 have been formed on the lateral surfaces 9 and they extend over the entire width of the lateral surface 9.
The protective case further comprises a housing 11 formed from a non-magnetic metal thin sheet material. The housing 11 comprises a top wall 12 which covers the permanent magnet 3. Extending from the top wall 12 over the lateral surfaces 9 of the base plate 5 are skirts 13. The lower edge of the skirt 13 comprises as a joint member 14 a bending 15 of the skirt 13 inside the groove 10 to secure the housing 11 and the base plate 5 to each other.
Fig. 5 to 10 present different groove forms 10 and correspondingly different forms of the bendings 15 of the skirt 13.
In Fig. 5 to 7, the groove 10 is rectangular in cross-section, whereby the upper first planar surface 16 and the lower second planar surface 17 which limit the groove 10 in the vertical direction are parallel to each other and spaced at a distance s from each other and at a right angle to the lateral surface 9 of the base plate. The bending 15 comprises a first flange 18 which is parallel to the first planar surface 16 and rests against the first planar surface, and a second flange 19 which is disposed at an angle to the first flange 18. The bending 15 is formed ac- cording to Fig. 5 to 7 by pressing the skirt 13 close to the lower edge thereof and close to the upper edge of the groove 10 by a knife-type pressing blade to curve inside the groove 10 so as to form the first flange 18 which rests against the first planar surface 16, and the second flange 19 which is held in compres- sive stress between the first planar surface 16 and the second planar surface 17 against the second planar surface 17. Fig. 7 also shows that at the same time, a formation 20, such as a ridge, protuberance or the like, is formed by a clenching tool inside the groove 10 to the point of connection of the second planar surface 17 and the lateral surface 9 to ensure that the bending 15 stays in the groove 10.
In the embodiment of Fig. 8, the first planar surface 16 and the second planar surface 17 are dis- posed at such angle to the lateral surface 9 which deviates from the right angle, and the groove 10 is V- shaped in cross-section. The first flange 16 forms an obtuse angle to the lateral surface 9 and rests against the upper first planar surface 16. In the embodiment of Fig. 9, the first planar surface 16 and the second planar surface 17 are disposed at such angle to the lateral surface 9 which deviates from the right angle, but the groove 10 is here a dovetail. In the embodiment of Fig. 10, the groove 10 is trapezoidal in cross-section and the first planar surface 16 and the second planar surface 17 which are parallel to each other and spaced at a distance s from each other are disposed at a skew angle to the lateral surface 9.
The grooves 10 according to Fig. 5 to 7, 8 and 10 are easily and quickly made by a rotating flange blade. The dovetail 10 of Fig. 9 has to be made by end milling, which is somewhat slower. The invention is not limited merely to the exemplifying embodiments referred to above; instead, many variations are possible within the scope of the inventive idea defined by the claims.

Claims

1. A surface-mountable permanent magnet element (1) intended to be mounted onto the periphery of the rotor (2) of a permanent magnet machine as the polar ele- ment, the permanent magnet element (1) comprising at least one permanent magnet (3) and a protective case
(4) enclosing said at least one permanent magnet, the protective case comprising:
- a base plate (5) comprising a securing mem- ber .(6) for securing the base plate to the rotor (2), the base plate also comprising a base surface (7) which can be placed against the periphery of the rotor (2), a top surface (8) on which said at least one permanent magnet is arranged, and at least one lateral surface (9) which extends substantially perpendicularly between the base surface and the top surface, the lateral surface comprising a recess (10), and
- a housing (11) which is formed from a metal thin sheet material, the housing comprising a top wall (12) which covers the permanent magnet (3), and a skirt (13) which extends from the top wall over the lateral surface (9) of the base plate, the skirt comprising a joint member (14) which is fitted in cooperation with the recess (10) to secure the housing (11) and the base plate (5) to each other, c h a r a c t e r i z e d in that the recess (10) is a groove (10) which extends substantially over the entire length of the lateral surface (9) of the base plate
(5) and which is limited by a first planar surface (16) which is disposed at an angle (α) to the lateral surface (9) of the base plate, the first planar surface (16) facing a first direction, and by a second planar surface (17) facing a second direction which is substantially opposite to the first direction; and that the joint member (14) is formed by the bending (15) of the edge of the skirt (13) inside the groove (10) for a substantial portion of the total length of the skirt, the bending (15) comprising a first flange (18) which is parallel to the first planar surface
(16) and rests against the first planar surface, and a second flange (19) which is at an angle to the first flange (18), the second flange (19) being held by compressive stress against the second planar surface
(17) .
2. The permanent magnet element according to claim 1, c h a r a c t e r i z e d in that the first planar surface (16) and the second planar surface (17) are parallel to each other and spaced at a distance (s) from each other.
3. The permanent magnet element according to claim 2, c h a r a c t e r i z e d in that the first planar surface (16) and the second planar surface (17) are disposed at a right angle to the lateral surface (9) .
4. The permanent magnet element according to claim 3, c h a r a c t e r i z e d in that the groove (10) is rectangular in cross-section.
5. The permanent magnet element according to claim 2, c h a r a c t e r i z e d in that the first planar surface (16) and the second planar surface (17) are disposed at such angle to the lateral surface (9) which deviates from the right angle.
6. The permanent magnet element according to claim 5, c h a r a c t e r i z e d in that the groove (10) is in the form of a parallelogram or trapezoid in cross- section.
7. The permanent magnet element according to claim 5, c h a r a c t e r i z e d in that the groove (10) is a dovetail .
8. The permanent magnet element according to any one of claims 1 to 7, c h a r a c t e r i z e d in that the point of connection of the second planar surface (17) and the lateral surface (9) comprises inside the groove (10) a formation (20), such as a ridge, protu- berance or the like, fitted to ensure that the bending
(15) inside the groove (10) stays in the groove.
9. The permanent magnet element according to any one of claims 1 to 9, c h a r a c t e r i z e d in that the base plate (5) and the housing (11) are in the form of a parallelepiped.
10. The permanent magnet element according to claim 9, c h a r a c t e r i z e d in that the base plate (5) is rectangular, whereby it comprises four lateral surfaces (9) with the groove (10) formed in each one of them.
11. The permanent magnet element according to any one of claims 1 to 10, c h a r a c t e r i z e d in that the bending (15) is deep drawn inside the groove (10) .
12. The permanent magnet element according to any one of claims 1 to 11, c h a r a c t e r i z e d in that the base plate (5) is made from a ferromagnetic material and the housing (11) is made from a non-magnetic material.
PCT/FI2008/050673 2007-11-30 2008-11-21 Surface-mountable permanent magnet element Ceased WO2009068736A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP08855424.1A EP2215702A4 (en) 2007-11-30 2008-11-21 Surface-mountable permanent magnet element

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI20075865A FI123167B (en) 2007-11-30 2007-11-30 Surface mounted permanent magnet element
FI20075865 2007-11-30

Publications (1)

Publication Number Publication Date
WO2009068736A1 true WO2009068736A1 (en) 2009-06-04

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EP (1) EP2215702A4 (en)
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EP2346144A1 (en) * 2010-01-11 2011-07-20 Converteam Technology Ltd Permanent magnet arrangement for an electrical machine
WO2011107168A1 (en) * 2010-03-03 2011-09-09 Siemens Aktiengesellschaft Method of attaching a magnet to a rotor or a stator of an electrical machine
WO2011129702A1 (en) * 2010-04-13 2011-10-20 Smartmotor As Arrangement and method for protection, mounting and retention of magnetic pole
US8063531B2 (en) 2010-01-11 2011-11-22 Converteam Technology Ltd. Permanent magnet arrangement for an electrical machine
EP2410633A1 (en) * 2010-07-20 2012-01-25 Siemens Aktiengesellschaft Permanent magnet rotor and method for producing such a rotor
EP2525474A1 (en) * 2011-05-20 2012-11-21 Alstom Wind, S.L.U. Generator rotor and method of assembling
EP2555383A1 (en) * 2011-08-01 2013-02-06 Siemens Aktiengesellschaft Permanent magnet assembly with sliding fixing arrangement and method for fixing a permanent magnet onto a base plate
GB2511574A (en) * 2013-03-08 2014-09-10 Magnomatics Ltd Apparatus and methods for magnet retention
WO2016146129A1 (en) * 2015-03-16 2016-09-22 Your Global Solution Aps A magnet protector, a method for adapting a magnet protector and use thereof
EP3435523A1 (en) * 2017-07-26 2019-01-30 TDK Corporation Magnet structure and motor
WO2019052938A1 (en) * 2017-09-12 2019-03-21 Brose Fahrzeugteile GmbH & Co. Kommanditgesellschaft, Würzburg ROTOR OF AN ELECTRIC MOTOR AND ELECTRIC MOTOR
EP2705595B1 (en) * 2011-05-06 2019-04-24 TA Instruments-Waters L.L.C. Linear motor with moving magnets and reduced cogging force
EP3567701A1 (en) * 2018-05-09 2019-11-13 Siemens Gamesa Renewable Energy A/S Magnet module for a permanent magnet machine

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DE102009054191B4 (en) * 2009-11-20 2020-09-17 Jenoptik Advanced Systems Gmbh Device and method for fastening magnets on a rotor
DE102009054191A1 (en) * 2009-11-20 2011-05-26 Esw Gmbh Apparatus and method for attaching magnets to a rotor
EP2498378A3 (en) * 2010-01-11 2013-01-23 Converteam Technology Ltd Permanent magnet arrangement for an electrical machine
US8063531B2 (en) 2010-01-11 2011-11-22 Converteam Technology Ltd. Permanent magnet arrangement for an electrical machine
EP2346144A1 (en) * 2010-01-11 2011-07-20 Converteam Technology Ltd Permanent magnet arrangement for an electrical machine
US8378544B2 (en) 2010-01-11 2013-02-19 Converteam Technology Ltd. Permanent magnet arrangement for an electrical machine
US9071104B2 (en) 2010-03-03 2015-06-30 Siemens Aktiengesellschaft Method of attaching a magnet to a rotor or a stator of an electrical machine
WO2011107168A1 (en) * 2010-03-03 2011-09-09 Siemens Aktiengesellschaft Method of attaching a magnet to a rotor or a stator of an electrical machine
WO2011129702A1 (en) * 2010-04-13 2011-10-20 Smartmotor As Arrangement and method for protection, mounting and retention of magnetic pole
EP2410633A1 (en) * 2010-07-20 2012-01-25 Siemens Aktiengesellschaft Permanent magnet rotor and method for producing such a rotor
US8629595B2 (en) 2010-07-20 2014-01-14 Siemens Aktiengesellschaft Permanent magnet rotor arrangement and method for producing such an arrangement
EP2705595B1 (en) * 2011-05-06 2019-04-24 TA Instruments-Waters L.L.C. Linear motor with moving magnets and reduced cogging force
CN103548241A (en) * 2011-05-20 2014-01-29 阿尔斯通可再生能源西班牙有限公司 Generator rotor and method of assembly
CN103548241B (en) * 2011-05-20 2016-07-13 阿尔斯通可再生能源西班牙有限公司 Generator rotor and method of assembly
WO2012159973A1 (en) * 2011-05-20 2012-11-29 Alstom Wind, S.L.U. Generator rotor and method of assembling
EP2525474A1 (en) * 2011-05-20 2012-11-21 Alstom Wind, S.L.U. Generator rotor and method of assembling
US9431858B2 (en) 2011-05-20 2016-08-30 Alstom Renovables España, S.L. Generator rotor and method of assembling
EP2555383A1 (en) * 2011-08-01 2013-02-06 Siemens Aktiengesellschaft Permanent magnet assembly with sliding fixing arrangement and method for fixing a permanent magnet onto a base plate
CN105164767A (en) * 2013-03-08 2015-12-16 马格诺麦克斯有限公司 Apparatus and methods for magnet retention
WO2014135902A1 (en) * 2013-03-08 2014-09-12 Magnomatics Limited Apparatus and methods for magnet retention
GB2511574A (en) * 2013-03-08 2014-09-10 Magnomatics Ltd Apparatus and methods for magnet retention
GB2511574B (en) * 2013-03-08 2017-10-04 Magnomatics Ltd Permanent magnet assembly for mounting to a rotor
US10102953B2 (en) 2013-03-08 2018-10-16 Magnomatics Limited Apparatus and methods for magnet retention
CN105164767B (en) * 2013-03-08 2019-01-18 马格诺麦克斯有限公司 Apparatus and method for magnet retention
JP2016513946A (en) * 2013-03-08 2016-05-16 マグノマティックス リミテッドＭａｇｎｏｍａｔｉｃｓ Ｌｉｍｉｔｅｄ Magnet holding apparatus and method
WO2016146129A1 (en) * 2015-03-16 2016-09-22 Your Global Solution Aps A magnet protector, a method for adapting a magnet protector and use thereof
CN109309418A (en) * 2017-07-26 2019-02-05 Tdk株式会社 Magnet tectosome and motor
JP2019030063A (en) * 2017-07-26 2019-02-21 Tdk株式会社 Magnet structure and motor
EP3435523A1 (en) * 2017-07-26 2019-01-30 TDK Corporation Magnet structure and motor
CN109309418B (en) * 2017-07-26 2021-10-22 Tdk株式会社 Magnet structure and motor
WO2019052938A1 (en) * 2017-09-12 2019-03-21 Brose Fahrzeugteile GmbH & Co. Kommanditgesellschaft, Würzburg ROTOR OF AN ELECTRIC MOTOR AND ELECTRIC MOTOR
EP3567701A1 (en) * 2018-05-09 2019-11-13 Siemens Gamesa Renewable Energy A/S Magnet module for a permanent magnet machine
CN110474447A (en) * 2018-05-09 2019-11-19 西门子歌美飒可再生能源公司 Magnetic body module for magneto

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Publication number Publication date
EP2215702A4 (en) 2016-10-26
EP2215702A1 (en) 2010-08-11
FI20075865A0 (en) 2007-11-30
FI123167B (en) 2012-11-30
FI20075865L (en) 2009-05-31

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