CN106787318A - Permagnetic synchronous motor p-m rotor punching and permagnetic synchronous motor - Google Patents

Abstract

The application discloses a permanent magnet rotor punching sheet for a permanent magnet synchronous motor and a permanent magnet synchronous motor, wherein the permanent magnet rotor punching sheet for a permanent magnet synchronous motor includes a punching body, and the punching body is uniformly arranged with a plurality of pairs of V Shaped magnetic steel groove; each pair of V-shaped magnetic steel grooves includes two symmetrically arranged magnetic steel installation grooves, and there are reinforcing ribs between the adjacent sides of the two magnetic steel installation grooves, and the magnetic steel installation grooves are far away from the reinforcing ribs One side of the magnetic steel mounting groove has a magnetic bridge between poles, and both ends of the side of the magnetic steel installation groove adjacent to the reinforcing rib have magnetic bridges within poles. In this application, the mechanical strength of the rotor under high-speed operation can be improved by setting reinforcing ribs, and the magnetic bridge between poles can be set to effectively reduce the magnetic flux leakage between the poles and the sharp angle of the magnetic steel without affecting the main magnetic circuit. In order to avoid the risk of demagnetization, the two magnetic isolation bridges in the magnetic steel installation groove can effectively reduce the magnetic flux leakage between the end of the magnetic steel itself and the magnetic steel caused by the reinforcing rib, so that the magnetic flux leakage in the pole is reduced.

Description

Permanent magnet rotor lamination for permanent magnet synchronous motor and permanent magnet synchronous motor

technical field

The invention relates to the technical field of motors, in particular to permanent magnet rotor stamping sheets for permanent magnet synchronous motors and permanent magnet synchronous motors.

Background technique

In recent years, rare earth permanent magnet synchronous motors, as energy-saving products, have the advantages of small size, high power density, light weight, high efficiency, and good output characteristics, and have been used more and more widely. The permanent magnet is introduced into the rotor of the permanent magnet synchronous motor, and its magnetic circuit structure is complex and diverse, and the calculation and analysis are much more complicated than ordinary motors. Therefore, the rational selection of the rotor structure of the permanent magnet synchronous motor has become the focus and difficulty of the motor design. The rotor magnetic circuit structure of the permanent magnet synchronous motor can be roughly divided into two categories, namely the surface-mounted magnetic circuit structure and the inserted magnetic circuit structure. For the rotor-inserted magnetic circuit structure, the utilization rate of the magnetic steel is low due to the large magnetic flux leakage of the magnetic circuit, and the unreasonable design of the rotor structure often results in poor overload capacity of the motor, low power density, and stray The loss and rotor eddy current loss are too large. How to reduce the magnetic flux leakage of the magnet and improve the utilization rate of the magnet to improve the power density and overload capacity of the motor has become a key point in the design of the interior permanent magnet motor.

Contents of the invention

In view of the above problems, the present invention proposes a permanent magnet rotor stamping piece for a permanent magnet synchronous motor and a permanent magnet synchronous motor that can effectively reduce the flux leakage of the magnet.

The technical scheme that the present invention takes is as follows:

A permanent magnet rotor stamping for a permanent magnet synchronous motor, including a stamping body, the stamping body is uniformly provided with n pairs of V-shaped magnetic steel grooves around its axis, where n is the number of poles of the rotor, and n is greater than or equal to 2 Integer; each pair of V-shaped magnetic steel grooves includes two symmetrically arranged magnetic steel installation grooves, and there is a reinforcing rib between the two adjacent sides of the two magnetic steel installation grooves, and the magnetic steel installation groove is far away from the reinforcement rib. There is a magnetic bridge for pole intervals on one side, and both ends of the side of the magnetic steel installation groove adjacent to the reinforcing ribs have intra-pole magnetic isolation bridges, which are respectively the first intra-pole magnetic isolation bridge and the second intra-polar magnetic isolation bridge.

The mechanical strength of the rotor under high-speed operation can be improved by setting ribs, and the magnetic bridge between poles can be set to effectively reduce the magnetic flux leakage between the poles and the sharp corner of the magnetic steel without affecting the main magnetic circuit. The risk of demagnetization, the magnetic isolation bridges in the two poles of the magnetic steel installation groove can effectively reduce the magnetic flux leakage between the end of the magnetic steel itself and the magnetic steel caused by the reinforcing rib, so that the magnetic flux leakage in the pole is reduced. Through the rational design of the pole interval magnetic bridge and the two inner pole magnetic bridges, the magnetic field of the main magnetic circuit is enhanced, the magnetic flux leakage of the rotor magnetic circuit is reduced, the utilization rate of the magnetic steel is improved, and the power density of the motor is increased.

Furthermore, the angle formed by the two magnetic steel installation grooves of the V-shaped magnetic steel groove is 125°-140°.

Further, the punch body includes 8 pairs of V-shaped magnetic steel grooves.

Further, the width of the reinforcing rib is 1-3 mm.

Furthermore, the minimum distance between the V-shaped magnetic steel groove and the outer periphery of the punch body is 1-3 mm.

The mechanical strength of the rotor under high-speed operation can be improved by limiting the minimum distance between the V-shaped magnetic steel groove and the outer periphery of the stamping body.

Further, the punch body includes a mounting hole in the middle, and a side wall of the mounting hole has a keyway, and the keyway is used for positioning and fixing with the rotating shaft.

The rotating shaft is provided with a keyway, and the rotating shaft is positioned and fixed with the keyway on the rotor punch through the flat key, and at the same time, the keyway also plays a positioning role when the rotor punches are stacked.

Furthermore, the side wall of the installation hole also has a film sorting groove, and the angle between the film sorting slot and the keyway relative to the center of the punch body is not 180°.

The angle between the slot and the keyway relative to the center of the punching body is not 180°. This setting ensures that the burrs on the rotor are in the same direction when the rotor is stacked through the slot, which can effectively improve the stacking coefficient.

The present application also discloses a permanent magnet synchronous motor, which includes a rotor punch, and the rotor punch is the above-mentioned permanent magnet rotor punch for a permanent magnet synchronous motor.

The beneficial effects of the present invention are: the mechanical strength of the rotor under high-speed operation can be improved by arranging reinforcing ribs, and the magnetic flux leakage between poles can be effectively reduced without affecting the main magnetic circuit by arranging a magnetic bridge between poles. The risk of demagnetization at the sharp corner of the magnetic steel is small. The magnetic isolation bridge in the two poles of the magnetic steel installation groove can effectively reduce the magnetic flux leakage between the end of the magnetic steel itself and the magnetic steel caused by the reinforcing rib, so that the leakage in the pole Magnetism is reduced. Through the rational design of the pole interval magnetic bridge and the two inner pole magnetic bridges, the magnetic field of the main magnetic circuit is enhanced, the magnetic flux leakage of the rotor magnetic circuit is reduced, the utilization rate of the magnetic steel is improved, and the power density of the motor is increased.

Description of drawings:

Fig. 1 is a schematic diagram of a permanent magnet rotor punching sheet for a permanent magnet synchronous motor of the present invention.

Each reference mark in the figure is:

1. Film processing slot; 2. Punching body; 3. Magnetic bridge between poles; 4. Magnetic steel installation slot; 5. Magnetic bridge in the first pole; 6. Magnetic bridge in the second pole; 7. Mounting hole ; 9, ribs; 10, keyway.

detailed description:

Below in conjunction with each accompanying drawing, the present invention is described in detail.

Example 1

As shown in Figure 1, a permanent magnet rotor punching for a permanent magnet synchronous motor includes a punching body 2, and the punching body 2 is uniformly provided with n pairs of V-shaped magnetic steel grooves around its axis, where n is the pole of the rotor number, and n is an integer greater than or equal to 2; each pair of V-shaped magnetic steel grooves includes two symmetrically arranged magnetic steel installation grooves 4, and there are reinforcing ribs between the two adjacent sides of the magnetic steel installation grooves 4 9. The side of the magnetic steel installation groove 4 away from the reinforcing rib 9 has a magnetic bridge 3 with pole interval (see point I), and the two ends of the side of the magnetic steel installation groove 4 adjacent to the reinforcing rib 9 have an inner pole magnetic bridge, respectively It is the magnetic isolation bridge 5 in the first pole and the magnetic isolation bridge 6 in the second pole (see II).

In this embodiment, the angle formed by the two magnetic steel installation grooves 4 of the V-shaped magnetic steel groove is 125°-140°.

In this embodiment, the punch body 2 includes 8 pairs of V-shaped magnetic steel grooves.

In this embodiment, the width of the reinforcing rib 9 is 1-3 mm.

In this embodiment, the minimum distance between the V-shaped magnetic steel groove and the outer periphery of the punch body 2 is 1-3 mm.

The mechanical strength of the rotor under high-speed operation can be improved by limiting the minimum distance between the V-shaped magnetic steel groove and the outer periphery of the punch body 2 .

In this embodiment, the punch body 2 includes a mounting hole 7 in the middle, and a side wall of the mounting hole 7 has a key groove 10 for positioning and fixing with the rotating shaft.

A keyway 10 is provided on the rotating shaft, and the rotating shaft is positioned and fixed with the keyway 10 on the rotor punch through a flat key, and the keyway 10 also plays a positioning role when the rotor punches are stacked.

In this embodiment, the side wall of the mounting hole 7 also has a slot 1 , and the angle between the slot 1 and the keyway 10 relative to the center of the punching body 2 is not 180°. The angle between the slot 1 and the keyway 10 relative to the center of the punching body 2 is not 180°. With this setting, the slot 1 ensures that the burrs of the rotor are in the same direction when the rotor is stacked, which can effectively improve the stacking effect. pressure factor.

In this embodiment, the permanent magnet rotor punching piece for the permanent magnet synchronous motor can improve the mechanical strength of the rotor under high-speed operation by setting the reinforcing rib 9, and by setting the pole interval magnetic bridge 3, it can be effectively reduced without affecting the main magnetic circuit The magnetic flux leakage between the poles is reduced, and the risk of demagnetization at the sharp corner of the magnetic steel is reduced. The magnetic isolation bridge between the two poles of the magnetic steel installation groove 4 can effectively reduce the gap between the end of the magnetic steel itself and the magnetic steel caused by the reinforcing rib 9. The magnetic flux leakage between poles reduces the magnetic flux leakage in the pole. Through the rational design of the magnetic bridge 3 between the poles and the two magnetic bridges within the poles, the magnetic field of the main magnetic circuit is enhanced, the magnetic flux leakage of the rotor magnetic circuit is reduced, the utilization rate of the magnetic steel is improved, and the power density of the motor is increased.

Example 2

This embodiment discloses a permanent magnet synchronous motor, including a rotor. The rotor is formed by laminating a plurality of rotor punches. The rotor punches in this embodiment are the permanent magnet rotors for permanent magnet synchronous motors mentioned in Embodiment 1. film.

The permanent magnet synchronous motor of this embodiment can improve the mechanical strength of the rotor under high-speed operation by providing reinforcing ribs, and can effectively reduce the magnetic flux leakage between the poles without affecting the main magnetic circuit by providing magnetic bridges between poles. To reduce the risk of demagnetization at the sharp corners of the magnetic steel, the magnetic isolation bridges in the two poles of the magnetic steel installation groove can effectively reduce the magnetic flux leakage between the end of the magnetic steel itself and the magnetic steel caused by the reinforcing rib, so that the magnetic steel in the pole Flux leakage is reduced. Through the rational design of the pole interval magnetic bridge and the two inner pole magnetic isolation bridges, the magnetic field of the main magnetic circuit is enhanced, the magnetic flux leakage of the rotor magnetic circuit is reduced, the utilization rate of the magnetic steel is improved, and the power density of the motor is increased.

The above is only a preferred embodiment of the present invention, and does not limit the scope of patent protection of the present invention. Any equivalent structural transformation made by using the description of the present invention and the contents of the accompanying drawings is directly or indirectly used in other related technical fields. All are equally included in the scope of protection of the present invention.

Claims (8)

1. a kind of permagnetic synchronous motor p-m rotor punching, it is characterised in that including punching body (2), punching body (2) around Its axis direction is evenly arranged with n to V-arrangement magnet steel groove, and wherein n is the number of poles of rotor, and n is the integer more than or equal to 2；Each pair V Shape magnet steel groove is included between two symmetrically arranged magnet steel mounting grooves (4), and the adjoining both sides of two magnet steel mounting grooves (4) With reinforcement (9), magnet steel mounting groove (4) has interpolar every magnetic bridge (3), magnet steel mounting groove (4) away from the side of reinforcement (9) The two ends of the side of neighbouring reinforcement (9) be respectively provided with it is extremely interior every magnetic bridge, respectively first it is extremely interior every magnetic bridge (5) and second it is extremely interior every Magnetic bridge (6).

2. permagnetic synchronous motor as claimed in claim 1 p-m rotor punching, it is characterised in that two of V-arrangement magnet steel groove It is 125 °~140 ° that magnet steel mounting groove (4) institute is angled.

3. permagnetic synchronous motor as claimed in claim 2 p-m rotor punching, it is characterised in that the punching body (2) Including 8 pairs of V-arrangement magnet steel grooves.

4. permagnetic synchronous motor as claimed in claim 1 p-m rotor punching, it is characterised in that the reinforcement (9) Width is 1~3mm.

5. permagnetic synchronous motor as claimed in claim 1 p-m rotor punching, it is characterised in that the V-arrangement magnet steel slot pitch Minimum range from punching body (2) periphery is 1~3mm.

6. permagnetic synchronous motor as claimed in claim 1 p-m rotor punching, it is characterised in that the punching body (2) Mounting hole (7) including being arranged on middle, the side wall of mounting hole (7) has a keyway (10), the keyway (10) for turn Axle positioning is fixed.

7. permagnetic synchronous motor as claimed in claim 6 p-m rotor punching, it is characterised in that the mounting hole (7) Side wall also has reason film trap (1), described to manage the angled not relative to punching body (2) center institute with keyway (10) of film trap (1) It is 180 °.

8. a kind of permagnetic synchronous motor, it is characterised in that including the permanent magnet synchronous electric as described in claim 1~7 any one Machine p-m rotor punching.