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WO2018062656A1 - Moteur bldc - Google Patents

Moteur bldc Download PDF

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Publication number
WO2018062656A1
WO2018062656A1 PCT/KR2017/004745 KR2017004745W WO2018062656A1 WO 2018062656 A1 WO2018062656 A1 WO 2018062656A1 KR 2017004745 W KR2017004745 W KR 2017004745W WO 2018062656 A1 WO2018062656 A1 WO 2018062656A1
Authority
WO
WIPO (PCT)
Prior art keywords
rotor
pole shoe
circumferential surface
bldc motor
stator
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/KR2017/004745
Other languages
English (en)
Korean (ko)
Inventor
신현재
임호빈
정경훈
조성국
진재경
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.)
Hanon Systems Corp
Original Assignee
Hanon Systems Corp
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
Priority claimed from KR1020170052375A external-priority patent/KR102191647B1/ko
Application filed by Hanon Systems Corp filed Critical Hanon Systems Corp
Priority to US16/063,590 priority Critical patent/US10879753B2/en
Priority to DE112017000188.9T priority patent/DE112017000188T5/de
Priority to CN201780003996.3A priority patent/CN108292865B/zh
Publication of WO2018062656A1 publication Critical patent/WO2018062656A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • 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
    • H02K1/12—Stationary parts of the magnetic circuit
    • 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
    • H02K29/00—Motors or generators having non-mechanical commutating devices, e.g. discharge tubes or semiconductor devices

Definitions

  • the present invention relates to a BLDC motor, and more particularly to a BLDC motor capable of reducing cogging torque and torque ripple.
  • BLDC motors can prevent friction and wear, which are disadvantages of conventional DC motors, and are relatively high in efficiency. Recently, BLDC motors are being applied as a cooling fan rotation motor in hybrid vehicles.
  • the BLDC motor is a motor that removes brushes and commutators from the DC motor and installs an electronic commutator.
  • the electric BLDC motor is provided with a rotor having a permanent magnet rotated at the center thereof, and a stator in which a driving coil is wound is fixed around the BLDC motor. That is, the stator in which the driving coil is wound on the outside is fixed, and the rotor having the permanent magnet on the inside is rotated.
  • the rotor 5 is arrange
  • the stator 2 is formed in a ring shape, and a plurality of teeth 3 are protruded inwardly and radially disposed, and a driving coil is wound around the teeth 3, and the teeth 3 adjacent to the rotor 5 are formed.
  • the pole shoe 5 is formed at the inner end.
  • the rotor 3 is coupled to a plurality of permanent magnets 6, the permanent magnets 6 are arranged spaced apart in the circumferential direction.
  • BLDC motor has a different magnitude of magnetoresistance (degree of preventing magnetic flux from flowing) according to the rotated position of the rotor, and pulsation of the motor torque is generated by the difference in magnetoresistance.
  • the pulsation of torque generated when the rotor rotates before applying electricity to the coil of the motor is called cogging torque, and the pulsation of the torque causes the motor to have an excitation circle for vibration and noise.
  • noise of the motor such as a cooling fan that is driven by the motor.
  • an object of the present invention is to provide a BLDC motor that can reduce the cogging torque and torque ripple of the motor accordingly to reduce the magnetic resistance between the stator and the rotor. It is.
  • a plurality of teeth 120 is formed extending into the core 110, each of the poles at the radially inner end of the teeth (120) A stator 100 in which the shoe 130 is extended; And a rotor 200 spaced apart from the inner side surrounded by the pole shoes 130 of the stator 100 and having a plurality of permanent magnets 220 coupled to the core 210.
  • the outer circumferential surface of the rotor 200 is formed in a circular shape, and the outer circumferential surface of a partial region corresponding to a specific angle range based on the center of rotation C of the rotor 200 is a straight line part having a straight shape ( 230, a radially inner circumferential surface of the pole shoe 130 is formed in an arc-shaped predetermined region, and an inner circumferential surface of both circumferential end portions 131 of the pole shoe 130 is a center line of the pole shoe ( It may be formed so that the distance from the outer peripheral surface of the rotor 200 increases as the circumferential direction away from CL).
  • both end portions 131 of the pole shoe 130 may be formed of a straight line portion 132 having a straight shape.
  • the pole shoe 130 may have a symmetrical inner circumferential surface of both end portions 131 based on the center line CL of the pole shoe.
  • the angular range ⁇ t between the starting points A and A 'of the inner circumferential surfaces of the circumferential opposite ends 131 of the pole shoe 130 formed such that the distance from the outer circumferential surface of the rotor 200 increases as the distance to the circumferential direction increases. It may be formed large ( ⁇ m ⁇ t).
  • linear part 230 of the outer circumferential surface of the rotor 200 may be disposed at positions between the permanent magnets 220 adjacent to each other.
  • An angular range ⁇ c between S) and the end point E may be large ( ⁇ m ⁇ c).
  • starting points A of the inner circumferential surfaces of both ends 131 of the circumferential direction of the pole shoe 130 are formed so that the distance from the outer circumferential surface of the rotor 200 increases as the circumferential direction moves away from the center line CL of the pole shoe.
  • An angle range ⁇ t between A ′) may be formed larger than the angle range ⁇ c between the start point S and the end point E of the straight line 230 ( ⁇ t> ⁇ c).
  • BLDC motor of the present invention has the advantage that the magnetic resistance between the stator and the rotor is reduced to reduce the cogging torque and torque ripple.
  • the counter electromotive force waveform is sine, thereby reducing the noise and vibration of the motor.
  • FIG. 1 is a partial schematic view showing a conventional BLDC motor.
  • FIG. 2 is a schematic diagram illustrating a BLDC motor according to an embodiment of the present invention.
  • Figure 3 is a partially enlarged view showing a BLDC motor according to an embodiment of the present invention.
  • FIG. 4 is a graph showing a back EMF waveform of a conventional BLDC motor.
  • FIG. 5 is a graph showing a back EMF waveform of a BLDC motor according to an embodiment of the present invention.
  • Figure 6 is a graph comparing the analysis by converting the back electromotive force waveform of the conventional BLDC motor and the BLDC motor of the present invention.
  • Figure 7 is a graph showing a comparison of the change in cogging torque according to the rotor rotation angle of the conventional BLDC motor and BLDC motor of the present invention.
  • FIG. 2 is a schematic view showing a BLDC motor according to an embodiment of the present invention
  • Figure 3 is a partially enlarged view showing a BLDC motor according to an embodiment of the present invention.
  • a plurality of teeth 120 are formed extending into the core 110, and the pole shoes 130 are respectively formed at radially inner ends of the teeth 120.
  • the outer circumferential surface of the rotor 200 is formed in a circular shape, and the outer circumferential surface of a partial region corresponding to a specific angle range based on the center of rotation C of the rotor 200 is a straight line part having a straight shape ( 230, a radially inner circumferential surface of the pole shoe 130 is formed in an arc-shaped predetermined region, and an inner circumferential surface of both circumferential end portions 131 of the pole shoe 130 is a center line of the pole shoe ( It may be formed so that the distance from the outer peripheral surface of the rotor 200 increases as the circumferential direction away from CL).
  • the stator 100 is a part fixed to the housing of the motor, and the core 110 may be formed in a cylindrical shape so that the inner center part is empty.
  • the plurality of teeth 120 extend in a radial direction toward the center from the inner circumferential surface of the core 110, but the teeth 120 may be arranged to be spaced apart in the circumferential direction.
  • the pole shoes 130 are formed at the radially inner end portions of the teeth 120, respectively, and the pole shoes 130 are formed in the form in which both ends of the circumferential protrusion protrude from the teeth 120.
  • the 120 and the pole shoe 130 may be formed in an inverted "T" shape.
  • the pole shoes 130 formed on the teeth 120 adjacent to each other may be formed to be spaced apart from each other.
  • coils may be wound around the teeth 120, and the coils to be wound may be disposed between the inner circumferential surface of the core 110 and the radial outer circumferential surface of the pole shoe 130.
  • the rotor 200 may be disposed at an empty portion in the inner center of the stator 100, and may be spaced apart from the inner side surrounded by the pole shoes 130. In this case, the rotor 200 may be formed such that the rotating shaft is coupled so that both ends of the rotating shaft are coupled to the housing of the motor by a bearing or a bush.
  • the rotor 200 may be formed by coupling a plurality of permanent magnets 220 to a cylindrical or cylindrical core 210.
  • the permanent magnets 220 may be spaced apart from each other along the circumferential direction at a position slightly spaced radially inward from the outer circumferential surface 211 of the core 210, each of the permanent magnets 220 in a straight form
  • the end portions of the permanent magnets 220 adjacent to each other may be formed to face each other so that the ends of the plurality of permanent magnets 220 may be arranged to form a circle.
  • the core 210 may be formed in a shape in which a plurality of grooves are arranged along the circumferential direction so that the permanent magnet may be inserted and coupled thereto.
  • the permanent magnet 220 has an N pole and an S pole, one permanent magnet is disposed so that the N pole is located radially outward, and the neighboring permanent magnets are disposed so that the S pole is located radially outward.
  • the plurality of permanent magnets may be alternately arranged in a form in which the positions of the N pole and the S pole are changed along the circumferential direction.
  • stator 100 may include 12 teeth 120
  • rotor 200 may include 10 permanent magnets 220 arranged in 10 poles.
  • the cross-section of the core 210 of the rotor 200 as shown in FIGS. 2 and 3 is seen. Is formed in a circular shape, the outer circumferential surface of the core 210 corresponding to a specific angle range ( ⁇ c) relative to the center of rotation (C) of the rotor 200 may be formed of a straight line portion 230 of a straight shape.
  • the inner circumferential surface of the pole shoe 130 of the portion corresponding to a specific angular range ⁇ t, which is a predetermined region of the central portion of the radially inner circumferential surface of the pole shoe 130 is formed of an arc-shaped arc portion 133, the pole shoe
  • the inner circumferential surface of the circumferential opposite end portions 131 of the 130 is circumferentially away from the center line CL of the pole shoe at both ends of the arc portion 133 and the outer circumferential surface formed in a circular shape of the core 200 of the rotor 200.
  • the straight portion 132 may be formed such that the distance of the large portion increases.
  • a circular outer circumferential surface 211 of the core 210 which is the outermost surface of the rotor 200, which is closest to the arc 133 of the inner circumferential surface of the pole shoe 130, which is the innermost surface of the stator 100, in the radial direction.
  • the distance is not constant, and the straight portion 132, which is the inner circumferential surface of the radially opposite ends 131 of the stator 100 and the pole shoe 130, and the circular outer circumferential surface 211 of the core 200 of the rotor 200 are mutually different.
  • the radial distance is not constant.
  • the BLDC motor of the present invention can reduce cogging torque and torque ripple by reducing the magnetoresistance between the stator and the rotor. Accordingly, the counter electromotive force waveform is sine, thereby reducing the noise and vibration of the motor.
  • both end portions 131 of the pole shoe 130 may be formed of a straight line portion 132 having a straight shape.
  • the inner circumferential surfaces of both end portions 131 of the pole shoe 130 may be formed as a straight line portion 132 having a linear shape, and the straight portion 132 may be the center line CL of the pole shoe 130. It may be formed in a straight line toward the direction and the radially outward direction in the circumferential direction with respect to).
  • the inner circumferential surfaces of both end portions 131 of the pole shoe 130 may be formed in a curved shape in addition to the straight shape.
  • the magnetoresistance is reduced when the polarity of the permanent magnet is changed while passing through the pole shoe portion of the stator when the rotor is rotated, thereby reducing the change in the magnetoresistance, thereby reducing cogging torque and torque ripple.
  • the pole shoe 130 may have a symmetrical inner circumferential surface of both end portions 131 based on the center line CL of the pole shoe.
  • both end portions 131 of the pole shoe 130 are formed as straight portions 132 so as to be symmetrical with respect to the center line CL of the pole shoe.
  • a pair of straight portions 132 may be formed in the.
  • the angular range ⁇ t between the starting points A and A 'of the inner circumferential surfaces of the circumferential opposite ends 131 of the pole shoe 130 formed such that the distance from the outer circumferential surface of the rotor 200 increases as the distance to the circumferential direction increases. It may be formed large ( ⁇ m ⁇ t).
  • the center of rotation of the rotor C The circular arc portion of the pole shoe 130 of the stator 100 than the angular range ( ⁇ m) between the outer ends (Mo, Mo '), which are radially outer edges of the adjacent portions of the two permanent magnets 220, An angular range ⁇ t between the starting points A and A ′ of the straight portion 132 of the pole shoe 130, which is the point where the 133 and the straight portion 132 meet, may be large ( ⁇ m ⁇ t). And the center of the stator and the center of rotation of the rotor can be formed to match.
  • the magnetic flux generated by the permanent magnets 220 can be formed in a more natural curve shape, it is possible to effectively reduce the change in magnetoresistance and magnetoresistance during rotation of the rotor.
  • linear part 230 of the outer circumferential surface of the rotor 200 may be disposed at positions between the permanent magnets 220 adjacent to each other.
  • the straight portion 230 of the core 200 of the rotor 200 may be formed on the outer circumferential surface of the core corresponding to the position between two permanent magnets 220 adjacent to each other in the circumferential direction. Accordingly, when the rotor is rotated and the polarity of the permanent magnet passing through the pole shoe is changed, the magnetoresistance is reduced and thus the change in the magnetoresistance is reduced, thereby reducing cogging torque and torque ripple.
  • An angular range ⁇ c between S) and the end point E may be large ( ⁇ m ⁇ c).
  • the center of rotation of the rotor C Rotor relative to the center of rotation (C) of the rotor than the angular range ( ⁇ m) between the outer ends (Mo, Mo ') of the radially outer edges of the adjacent portions of the two permanent magnets 220 200, an angular range ⁇ c between the starting point S and the end point E of the straight portion 230 of the core 210 may be large ( ⁇ m ⁇ c).
  • the magnetic flux generated by the permanent magnets 220 can be formed in a more natural curve shape, it is possible to effectively reduce the change in magnetoresistance and magnetoresistance during rotation of the rotor.
  • starting points A of the inner circumferential surfaces of both ends 131 of the circumferential direction of the pole shoe 130 are formed so that the distance from the outer circumferential surface of the rotor 200 increases as the circumferential direction moves away from the center line CL of the pole shoe.
  • An angle range ⁇ t between A ′) may be formed larger than the angle range ⁇ c between the start point S and the end point E of the straight line 230 ( ⁇ t> ⁇ c).
  • the center of rotation of the rotor C Between the starting points (A, A ') of the straight portion 132 of the pole shoe 130, which is the point where the arc portion 133 and the straight portion 132 of the stator 100 pole shoe 130 meet.
  • the angular range ⁇ t is greater than the angular range ⁇ c between the starting point S and the end point E of the straight line 230 of the core 200 of the rotor 200 on the basis of the center of rotation C of the rotor ( ⁇ t> ⁇ c).
  • the magnetic flux generated by the permanent magnets 220 can be formed in a more natural curve shape, it is possible to effectively reduce the change in magnetoresistance and magnetoresistance during rotation of the rotor.
  • the inner circumferential surfaces of both ends 131 of the stator 100 and the pole shoe 130 in the circumferential direction are formed of the straight portions 132, and the straight portions 230 of the straight shape are formed on the outer circumferential surfaces of the core 210 of the rotor 200.
  • sine of the counter electromotive force waveform may be performed, thereby reducing cogging torque and torque ripple.
  • the counter electromotive force waveform of the motor in which the entire inner circumferential surface of the pole shoe of the conventional stator is formed in an arc shape and the entire outer surface of the core of the rotor is formed in the circumferential surface as shown in FIG.
  • the magnitude of the counter electromotive force and the shape of the counter electromotive force waveform can be determined by the permanent magnet of the rotor, the pole shoe of the stator, and the shape of the rotor. Can be determined.
  • the current flowing when the motor is driven is determined by the voltage supplied from the inverter, and as the shape of the counter electromotive force is closer to the voltage that can be supplied by the inverter, torque ripple or vibration may be reduced during driving.
  • the fundamental wave component of the counter electromotive force increases, the performance is not unconditionally improved, and the range of the driving speed may be determined according to the fundamental wave size of the counter electromotive force.
  • more harmonics contained in the back EMF waveform can be disadvantageous in terms of vibration and noise.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Permanent Field Magnets Of Synchronous Machinery (AREA)
  • Iron Core Of Rotating Electric Machines (AREA)

Abstract

La présente invention concerne un moteur BLDC, le moteur BLDC comprenant : un stator ayant une pluralité de dents s'étendant vers l'intérieur du noyau, et ayant une pièce polaire étendue au niveau de l'extrémité interne, dans la direction radiale, de chaque dent ; et un rotor agencé avec une distance de séparation à l'intérieur du stator entouré par les pièces polaires, et ayant une pluralité d'aimants permanents fixés au noyau, la surface circonférentielle externe du rotor étant circulaire, mais, par rapport au centre de rotation (C) du rotor, une partie de la surface circonférentielle externe correspondant à une plage angulaire particulière étant une partie droite linéaire, et une région définie dans la partie centrale de la surface circonférentielle interne dans la direction radiale de la pièce polaire étant circulaire, et comme la surface circonférentielle interne de chacune des extrémités dans la direction circonférentielle de la pièce polaire est formée de telle sorte que la distance jusqu'à la surface circonférentielle externe du rotor augmente à mesure que la distance à partir de la ligne centrale (CL) de la pièce polaire augmente dans la direction circonférentielle, la résistance magnétique entre le stator et le rotor étant réduite, ce qui permet de réduire le couple de détente et l'ondulation de couple.
PCT/KR2017/004745 2016-09-29 2017-05-08 Moteur bldc Ceased WO2018062656A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
US16/063,590 US10879753B2 (en) 2016-09-29 2017-05-08 Brushless direct current motor
DE112017000188.9T DE112017000188T5 (de) 2016-09-29 2017-05-08 Bürstenloser Gleichstrommotor
CN201780003996.3A CN108292865B (zh) 2016-09-29 2017-05-08 无刷直流电机

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
KR20160125183 2016-09-29
KR10-2016-0125183 2016-09-29
KR10-2017-0052375 2017-04-24
KR1020170052375A KR102191647B1 (ko) 2016-09-29 2017-04-24 Ｂｌｄｃ 모터

Publications (1)

Publication Number Publication Date
WO2018062656A1 true WO2018062656A1 (fr) 2018-04-05

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ID=61760069

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/KR2017/004745 Ceased WO2018062656A1 (fr) 2016-09-29 2017-05-08 Moteur bldc

Country Status (1)

Country Link
WO (1) WO2018062656A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108832737A (zh) * 2018-07-16 2018-11-16 珠海格力电器股份有限公司 电机定子冲片、电机定子、电机
CN110380525A (zh) * 2018-04-13 2019-10-25 现代自动车株式会社 内置式永磁电动机
CN116742845A (zh) * 2023-05-16 2023-09-12 石河子大学 一种降振减噪的定转子结构及开关磁阻电机

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003047181A (ja) * 2001-07-26 2003-02-14 Mitsumi Electric Co Ltd ブラシレスモータ
JP2003284269A (ja) * 2002-03-25 2003-10-03 Toyota Motor Corp 分割ステータ構造を有する回転電動機
JP2014107939A (ja) * 2012-11-27 2014-06-09 Mitsuba Corp ブラシレスモータ
JP2014209828A (ja) * 2012-07-31 2014-11-06 アスモ株式会社 ロータ、モータ、及び、ロータの製造方法
KR20160024801A (ko) * 2014-08-25 2016-03-07 한온시스템 주식회사 브러시리스 모터

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003047181A (ja) * 2001-07-26 2003-02-14 Mitsumi Electric Co Ltd ブラシレスモータ
JP2003284269A (ja) * 2002-03-25 2003-10-03 Toyota Motor Corp 分割ステータ構造を有する回転電動機
JP2014209828A (ja) * 2012-07-31 2014-11-06 アスモ株式会社 ロータ、モータ、及び、ロータの製造方法
JP2014107939A (ja) * 2012-11-27 2014-06-09 Mitsuba Corp ブラシレスモータ
KR20160024801A (ko) * 2014-08-25 2016-03-07 한온시스템 주식회사 브러시리스 모터

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110380525A (zh) * 2018-04-13 2019-10-25 现代自动车株式会社 内置式永磁电动机
CN108832737A (zh) * 2018-07-16 2018-11-16 珠海格力电器股份有限公司 电机定子冲片、电机定子、电机
CN108832737B (zh) * 2018-07-16 2024-04-19 珠海格力电器股份有限公司 电机定子冲片、电机定子、电机
CN116742845A (zh) * 2023-05-16 2023-09-12 石河子大学 一种降振减噪的定转子结构及开关磁阻电机
CN116742845B (zh) * 2023-05-16 2024-03-15 石河子大学 一种降振减噪的定转子结构及开关磁阻电机

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