CN109861426B

CN109861426B - Rotor structure of rotor magnetic field sinusoidal permanent magnet reluctance synchronous motor

Info

Publication number: CN109861426B
Application number: CN201910203808.2A
Authority: CN
Inventors: 林明耀; 孔永�; 伍锡坤; 张旭
Original assignee: Southeast University
Current assignee: Southeast University
Priority date: 2019-03-18
Filing date: 2019-03-18
Publication date: 2021-07-27
Anticipated expiration: 2039-03-18
Also published as: CN109861426A

Abstract

The invention discloses a rotor structure of a rotor magnetic field sinusoidal permanent magnet reluctance synchronous motor, which comprises a central rotating shaft and a rotor iron core sleeved on the central rotating shaft, wherein P through groove groups with the same shape and size are uniformly arranged in the rotor iron core around the central rotating shaft, P is the number of rotor magnetic poles, each through groove group comprises a plurality of through grooves, permanent magnets are arranged in the through grooves, the polarities of the permanent magnets in the same through groove group are the same, the polarities of the permanent magnets in two adjacent through groove groups are different, and the lengths of the permanent magnets in the same through groove group are also different. The length of the permanent magnets in the same through slot group is set to be different, so that the sine of the magnetic field of the rotor is improved, and the ripple torque is reduced. The invention can reduce the harmonic content of the air gap magnetic field, reduce the eddy current loss and improve the operation efficiency of the motor.

Description

Rotor structure of rotor magnetic field sinusoidal permanent magnet reluctance synchronous motor

Technical Field

The invention relates to a rotor structure of a permanent magnet reluctance synchronous motor, in particular to a rotor structure of a permanent magnet reluctance synchronous motor with a sinusoidal rotor magnetic field.

Background

Magnetic barriers are distributed in the multilayer magnetic barrier type permanent magnet reluctance synchronous motor rotor according to a certain rule and used for increasing the salient polarity of the motor to generate reluctance torque, and permanent magnets are embedded in the magnetic barriers, so that the torque density and the power factor of the motor are further improved. However, the arrangement of the rotor multi-layer magnetic barriers causes the magnetic resistance distribution to be uneven, the air gap magnetomotive force harmonic content is large, and the ripple torque is high. The addition of the permanent magnet causes cogging torque, and the cogging torque and ripple torque together cause the defect of large output torque pulsation of the multilayer magnetic barrier type permanent magnet reluctance synchronous motor.

In applications with high requirements for noise and vibration, low torque ripple becomes an important index for motor design.

Disclosure of Invention

The purpose of the invention is as follows: the invention aims to provide a rotor structure of a rotor magnetic field sinusoidal permanent magnet reluctance synchronous motor, which can enable the sine property of the rotor magnetic field to be higher, thereby reducing the torque pulsation of the motor.

The technical scheme is as follows: in order to achieve the purpose, the invention adopts the following technical scheme:

the rotor structure of the rotor magnetic field sinusoidal permanent magnet reluctance synchronous motor comprises a central rotating shaft and a rotor iron core sleeved on the central rotating shaft, wherein P through groove groups with the same shape and size are uniformly arranged in the rotor iron core around the central rotating shaft, P is the number of rotor magnetic poles, each through groove group comprises a plurality of through grooves, permanent magnets are arranged in the through grooves, the polarities of the permanent magnets in the same through groove group are the same, the polarities of the permanent magnets in two adjacent through groove groups are different, and the lengths of the permanent magnets in the same through groove group are also different.

Further, it includes three logical groove to lead to the groove group, it leads to the groove to be the inlayer in proper order in the direction of keeping away from central pivot, intermediate level leads to the groove and outer logical groove, the symmetry axis of three logical groove all passes through the centre of a circle of central pivot, the permanent magnet of locating in the logical groove of inlayer is the inlayer permanent magnet, the permanent magnet of locating in the logical groove of intermediate level is the intermediate level permanent magnet, the permanent magnet of locating in the outer logical groove is outer permanent magnet, the symmetry axis of inlayer permanent magnet coincides with the symmetry axis that the logical groove of inlayer, the symmetry axis of intermediate level permanent magnet coincides with the symmetry axis that the logical groove of intermediate level, the symmetry axis of outer permanent magnet coincides with the symmetry axis that the outer logical groove.

Further, the length l of the inner permanent magnet_PM1Satisfy l_PM1≤l_RLength l of the intermediate layer permanent magnet_PM2Satisfy l_PM2＝0.866×l_RLength l of outer permanent magnet_PM3Satisfy l_PM3＝0.5×l_R，l_RIs the axial length of the rotor core.

Further, the shape that the groove is led to inlayer, intermediate level and skin is the U-shaped, and the groove is led to inlayer, intermediate level and skin all includes a base and two sides, and the base that the groove is led to inlayer, intermediate level and skin is led to the groove and is parallel to each other.

Further, a magnetic guiding bridge is arranged between the side edges of the inner layer through groove, the middle layer through groove and the outer wall of the rotor core. This maintains the integrity of the rotor and serves to conduct the flux.

Further, the length l of the magnetic conducting bridge_rib≥0.5mm。

Has the advantages that: the invention discloses a rotor structure of a rotor magnetic field sinusoidal permanent magnet reluctance synchronous motor, which improves the sine of a rotor magnetic field and reduces ripple torque by setting the lengths of permanent magnets in the same through slot group to be different. The invention can reduce the harmonic content of the air gap magnetic field, reduce the eddy current loss and improve the operation efficiency of the motor.

Drawings

FIG. 1 is a perspective view of a rotor structure in accordance with an embodiment of the present invention;

FIG. 2 is a plan view of a rotor structure in accordance with an embodiment of the present invention;

fig. 3 is a structural diagram of a permanent magnet in a through slot group in an embodiment of the present invention.

Detailed Description

The technical solution of the present invention will be further described with reference to the following detailed description and accompanying drawings.

The specific embodiment discloses a rotor structure of a rotor magnetic field sinusoidal permanent magnet reluctance synchronous motor, as shown in fig. 1, the rotor structure comprises a central rotating shaft 1 and a rotor core 2 sleeved on the central rotating shaft 1, wherein P through groove groups 3 with the same shape and size are uniformly arranged in the rotor core 2 around the central rotating shaft 1, P is the number of rotor magnetic poles, each through groove group 3 comprises a plurality of through grooves, permanent magnets are arranged in the through grooves, the polarities of the permanent magnets in the same through groove group 3 are the same, the polarities of the permanent magnets in two adjacent through groove groups 3 are different, and the lengths of the permanent magnets in the same through groove group 3 are also different.

As shown in fig. 2, the through groove group 3 includes three through grooves, it is the inlayer that it leads to the groove 4 in proper order to lead to the groove in the direction of keeping away from central pivot 1, intermediate level leads to groove 5 and outer logical groove 6, the symmetry axis of three through groove all passes through the centre of a circle of central pivot 1, the permanent magnet of locating in the interior level leads to the groove 4 is inlayer permanent magnet 7, the permanent magnet of locating in the intermediate level leads to the groove 5 is intermediate level permanent magnet 8, the permanent magnet of locating in the outer logical groove 6 is outer permanent magnet 9, the symmetry axis of inlayer permanent magnet 7 coincides with the symmetry axis of inlayer through groove 4, the symmetry axis of intermediate level permanent magnet 8 coincides with the symmetry axis of intermediate level leads to the groove 5, the symmetry axis of outer permanent magnet 9 coincides with the symmetry axis of outer logical groove 6.

As shown in fig. 3, the length l of the inner permanent magnet 7_PM1Satisfy l_PM1≤l_RMiddle layer ofLength l of permanent magnet 8_PM2Satisfy l_PM2＝0.866×l_RLength l of outer permanent magnet 9_PM3Satisfy l_PM3＝0.5×l_R，l_RIs the axial length of the rotor core.

The shape that the groove 4 is led to inlayer, intermediate level leads to groove 5 and outer logical groove 6 can be the U-shaped, and the groove 4 is led to the inlayer, intermediate level leads to groove 5 and outer logical groove 6 and all includes a base and two sides, and the base that the groove 4 is led to the inlayer, intermediate level leads to groove 5 and outer logical groove 6 is parallel to each other. And magnetic guiding bridges 10 are arranged between the side edges of the inner-layer through groove 4, the middle-layer through groove 5 and the outer-layer through groove 6 and the outer wall of the rotor core 2. Length l of magnetic conducting bridge 10_rib≥0.5mm。

Example 1:

this embodiment is a 6-pole permanent magnet reluctance synchronous motor rotor, where P is 6. The other parameters are: l_R＝50mm，l_rib＝0.5mm，l_PM1＝50mm，l_PM2＝43.3mm，l_PM3＝25mm。

Claims

1. The utility model provides a rotor magnetic field sinusoidal permanent magnetism reluctance synchronous machine rotor structure which characterized in that: the permanent magnet synchronous motor comprises a central rotating shaft (1) and a rotor core (2) sleeved on the central rotating shaft (1), wherein P through groove groups (3) with the same shape and size are uniformly arranged in the rotor core (2) around the central rotating shaft (1), P is the number of rotor magnetic poles, permanent magnets are arranged in through grooves, the polarities of the permanent magnets in the same through groove group (3) are the same, the polarities of the permanent magnets in two adjacent through groove groups (3) are different, and the lengths of the permanent magnets in the same through groove group (3) are also different; lead to groove group (3) including three logical groove, it leads to groove (4) to be the inlayer in proper order in the direction of keeping away from central pivot (1), intermediate level leads to groove (5) and outer logical groove (6), the symmetry axis of three logical groove all passes through the centre of a circle of central pivot (1), the permanent magnet of locating in the logical groove of inlayer (4) is inlayer permanent magnet (7), the permanent magnet of locating in the logical groove of intermediate level (5) is intermediate level permanent magnet (8), the permanent magnet of locating in the outer logical groove (6) is outer permanent magnet (9), the symmetry axis of inlayer permanent magnet (7) and the symmetry axis coincidence that the logical groove of inlayer (4), the symmetry axis of intermediate level permanent magnet (8) and the symmetry axis coincidence that the logical groove of intermediate level (5), outer permanent magnet coincidesThe symmetry axis of the body (9) coincides with the symmetry axis of the outer through groove (6), and the length l of the inner permanent magnet (7)_PM1Satisfy l_PM1≤l_RLength l of the intermediate layer permanent magnet (8)_PM2Satisfy l_PM2＝0.866×l_RLength l of outer permanent magnet (9)_PM3Satisfy l_PM3＝0.5×l_R，l_RIs the axial length of the rotor core.

2. The rotor structure of the rotor magnetic field sinusoidal permanent magnet reluctance synchronous motor according to claim 1, wherein: the shape that the groove (4) are led to inlayer, intermediate level lead to groove (5) and outer logical groove (6) is the U-shaped, and inlayer leads to groove (4), intermediate level lead to groove (5) and outer logical groove (6) and all includes a base and two sides, and the base that the groove (4) are led to inlayer, intermediate level lead to groove (5) and outer logical groove (6) is parallel to each other.

3. The rotor structure of the rotor magnetic field sinusoidal permanent magnet reluctance synchronous motor according to claim 2, wherein: and magnetic guiding bridges (10) are arranged between the side edges of the inner layer through groove (4), the middle layer through groove (5) and the outer layer through groove (6) and the outer wall of the rotor core (2).

4. The rotor structure of the rotor magnetic field sinusoidal permanent magnet reluctance synchronous motor according to claim 3, wherein: the length l of the magnetic conducting bridge (10)_rib≥0.5mm。