CN114024384A

CN114024384A - Permanent magnet synchronous motor segmented skewed pole rotor structure

Info

Publication number: CN114024384A
Application number: CN202111266338.8A
Authority: CN
Inventors: 佟宁泽; 陈勇; 郭海伦; 党成涛
Original assignee: Automation Research and Design Institute of Metallurgical Industry
Current assignee: Automation Research and Design Institute of Metallurgical Industry
Priority date: 2021-10-28
Filing date: 2021-10-28
Publication date: 2022-02-08

Abstract

A permanent magnet synchronous motor segmented skewed pole rotor structure belongs to the technical field of industrial automatic control technology and new energy automobile driving motors. The multi-key-groove rotor comprises a multi-key-groove main shaft (1), a flat key (2), a first segmented rotor core (3) and a second segmented rotor core (4). The first segmented rotor core (3) and the second segmented rotor core (4) are identical in structure, the same punching sheet is used, and the front side and the back side are exchanged only during installation. The rotor segmented oblique pole is realized by matching a first eccentric key groove (5) and a second eccentric key groove (6) on a first segmented rotor core (3) and a second segmented rotor core (4) with a first key groove (7), a second key groove (8) and a third key groove (9) on a multi-key-groove main shaft (1). The segmented rotor core structure has the advantages that the segmented rotor core structure is completely consistent on the premise of realizing rotor slant poles, the mold cost can be effectively reduced, and large-scale automatic production is easy to realize.

Description

Permanent magnet synchronous motor segmented skewed pole rotor structure

Technical Field

The invention belongs to the technical field of industrial automatic control technology and new energy automobile driving motors, and particularly relates to a segmented skewed pole rotor structure of a permanent magnet synchronous motor, which is suitable for various inner rotor permanent magnet synchronous motors.

Background

Due to the development of motor control technology and the application of motors in the field of new energy automobiles, more and more driving motors are widely used. Aiming at some occasions with higher precision requirements, the output torque of the motor is required to have small fluctuation and low cogging torque, and the vibration noise of the motor is also required to have correspondingly higher requirements, so that the motor is required to be optimally designed. In order to achieve the above optimized indexes and weaken the influence caused by harmonic waves, the permanent magnet synchronous motor usually uses a stator skewed slot or a rotor skewed pole mode, so that the output torque fluctuation and the cogging torque of the motor can be effectively weakened, and the vibration and the noise of the motor can be inhibited. The current method is to segment the rotor according to the rotor slant pole structure, each segment of the rotor is provided with key slots with different positioning, and the key slots are matched with the main shaft through a flat key, so that each segment of the rotor is different, the same type of rotor corresponds to various different rotor punching sheets, great difficulty is brought to production, and in addition, the mold cost of the motor is increased.

Disclosure of Invention

The invention aims to provide a permanent magnet synchronous motor segmented skewed pole rotor structure which is easy to produce; the rotor core only keeps one structural form while the rotor core is segmented.

The rotor core and the main shaft are positioned in a key groove mode, the key groove mode is different from the mode that a plurality of different rotor cores are matched with the original key groove, the segmented rotor cores are completely consistent, and the oblique poles are formed by adjusting the distribution of the key grooves in the main shaft and the opening positions of the key grooves in the segmented rotor cores. The rotor core structure and the multi-keyway main shaft matched structure are used for realizing the rotor segmented skewed pole structure of the permanent magnet synchronous motor, so that the design of the rotor core of the motor keeps a structure, the cost of a die is reduced, the assembly process of the rotor is simplified, and the production efficiency of the motor with a related structure is greatly improved.

The permanent magnet synchronous motor rotor comprises a multi-keyway main shaft 1, a flat key 2, a segmented rotor core 3 and a segmented rotor core 4, wherein the segmented rotor core 3 and the segmented rotor core 4 are symmetrical in structure, the same rotor punching sheet is used, the front side and the back side are exchanged only during installation, and the segmented rotor core 3 and the segmented rotor core 4 are installed in a matched mode through the flat key 2 and the multi-keyway main shaft 1 to form the segmented skewed pole permanent magnet synchronous motor rotor. The following structure of the present invention is further illustrated:

1 asymmetric keyway rotor core

The inner hole of the first sectional rotor core 3 connected with the main shaft is provided with a first eccentric key groove 5 and a second eccentric key groove 6, the first eccentric key groove 5 and the second eccentric key groove 6 are symmetrically distributed on two sides of the transverse shaft, but are on the same side of the longitudinal shaft, so that an eccentric structure is formed, and the eccentric angles are the same.

The second sectional rotor core 4 and the first sectional rotor core 3 are completely symmetrical in structure, and are processed by using the same rotor punching die, so that the die cost is greatly reduced, and the front side and the back side are interchanged only during assembly to form symmetrical distribution. As can be seen from fig. 2 and 3, the first eccentric key groove 5 and the second eccentric key groove 6 are both on the left side of the longitudinal axis for the first segmented rotor core 3, and the first eccentric key groove 5 and the second eccentric key groove 6 are both on the right side of the longitudinal axis for the second segmented rotor core 4.

2 multi-keyway spindle

A plurality of key grooves are formed in the multi-key-groove spindle 1 and used for being matched with a rotor core, and the rotor core is matched with different positions of the first groove 7, the second key groove 8 and the third key groove 9 to achieve rotor slant poles. The lengths of the key grooves are completely consistent, the number of the key grooves is one less than the number of the rotor core sections, and the used flat keys 2 are also of the same type. The first keyway 7, second keyway 8 and third keyway 9 are staggered relative to the axis of the multi-keyway spindle 1 as shown in the schematic views of fig. 6, 7, 8 and 9. The front half section of the first key groove 7 is matched with the first segmented rotor core 3, and the rear half section of the first key groove 7 is matched with the second segmented rotor core 4; the front half section of the second key groove 8 is matched with the second sectional rotor core 4, and the rear half section of the second key groove 8 is matched with the first sectional rotor core 3; the first half section of the third key slot 9 is matched with the first sectional rotor core 3, and the second half section of the third key slot 9 is matched with the second sectional rotor core 4. The rotor slant poles are realized by staggered matching assembly.

The invention has the advantages that on the premise of realizing the rotor slant pole, the segmented rotor core structures are completely consistent, the mold cost can be effectively reduced, and the large-scale automatic production is easy to realize.

Drawings

Fig. 1 is an assembly view of a rotor of a segmented skewed pole permanent magnet synchronous motor.

Fig. 2 is a schematic view of segmented rotor core 3.

Fig. 3 is a schematic view of segmented rotor core 4.

Fig. 4 is an isometric view of a multi-keyway spindle.

FIG. 5 is a side view of a multi-keyway spindle.

Fig. 6 is a view from direction a-a of fig. 5.

Fig. 7 is a view from direction B-B of fig. 5.

Fig. 8 is a view in the direction of C-C of fig. 5.

Fig. 9 is a view from direction D-D of fig. 5.

Fig. 10 is a schematic view of a rotor of a segmented skewed pole permanent magnet synchronous motor.

Fig. 11 is a view from direction E-E of fig. 10.

Fig. 12 is a view from direction F-F of fig. 10.

Fig. 13 is a view from direction G-G of fig. 10.

Fig. 14 is a view from direction H-H of fig. 10.

In the figure, a multi-key-groove spindle 1, a flat key 2, a first segmented rotor core 3, a first segmented rotor core 4, a first eccentric key groove 5, a second eccentric key groove 6, a first key groove 7, a second key groove 8 and a third key groove 9.

Detailed Description

The invention aims to provide a scheme for realizing the rotor oblique poles of a permanent magnet synchronous motor in a segmented oblique pole mode, which is different from the traditional method for realizing the oblique poles by matching a single key slot with various rotor cores.

The rotor comprises a multi-keyway main shaft 1, a flat key 2, a first segmented rotor iron core 3 and a second segmented rotor iron core 4. Wherein multi-keyway spindle 1 is connected to first segmented rotor core 3 and second segmented rotor core 4 by flat key 2. The first segmented rotor core 3 and the second segmented rotor core 4 are symmetrical in structure, the same type of rotor punching sheet is used, and only installation modes are different. A first eccentric key groove 5 and a second eccentric key groove 6 are formed in the iron core and matched with a first key groove 7, a second key groove 8 and a third key groove 9 in the multi-key-groove spindle 1 to form a complete segmented skewed-pole permanent magnet synchronous motor rotor.

In order to realize the structure, the first segmented rotor core 3 and the second segmented rotor core 4 are structurally symmetrical, the same rotor punching sheet structure is used, and the front surface and the back surface of the first segmented rotor core 3 are exchanged only when the rotor punching sheet structure is used, so that the first segmented rotor core 4 is formed. The first segmented rotor core 3 is provided with a first eccentric slot 5 and a second eccentric key slot 6. The first eccentric key groove 5 and the second eccentric key groove 6 are symmetrically distributed on two sides of the transverse shaft, but are on the same side of the longitudinal shaft, so that an eccentric structure is formed, and the eccentric angles are the same. The control of the oblique pole angle is realized through the control of the eccentric angle.

The multi-keyway main shaft 1 is alternately provided with a plurality of keyways, namely a first keyway 7, a second keyway 8 and a third keyway 9. The keyway length is about two segmented rotor cores and the single flat key 2 is identical in length. The number of the key slots is one less than that of the segmented rotor cores, and two segmented rotor cores are fixed by each flat key 2.

The assembly of the segmented skewed pole rotor is schematically shown in fig. 10, and the eccentric key slot on the segmented rotor core is matched with the key slot on the multi-key-slot spindle 1 through a flat key. The first eccentric key slot 5 on the first section of the first segmented rotor core 3 is overlapped with the first key slot 7 on the multi-key-slot main shaft 1 in a sequence from left to right; a first eccentric key slot 5 on the second section of the second segmented rotor core 4 is superposed with a first key slot 7 on the multi-key-slot main shaft 1, and a second eccentric key slot 6 on the second segmented rotor core 4 is superposed with a second key slot 8 on the multi-key-slot main shaft 1; a first eccentric key groove 5 on the third section of the first segmented rotor core 3 is superposed with a third key groove 9 on the multi-key-groove main shaft 1, and a second eccentric key groove 6 on the first segmented rotor core 3 is superposed with a second key groove 8 on the multi-key-groove main shaft 1; the first eccentric key slot 5 on the fourth section of the second segmented rotor core 4 coincides with the third key slot 9 on the multi-key-slot spindle 1. First subsection rotor core 3 of first festival and fourth festival second subsection rotor core 4 only cooperate with many key ways main shaft 1 through a flat key 2, and second festival second subsection rotor core 4 and third festival first subsection rotor core 3 cooperate with many key ways main shaft 1 through two flat keys 2. By the above matching manner, the rotor slant pole effect in fig. 1 is achieved.

Claims

1. A permanent magnet synchronous motor segmented skewed pole rotor structure is characterized by comprising a multi-key-groove main shaft (1), a flat key (2), a segmented rotor iron core (3) and a segmented rotor iron core (4), wherein the segmented rotor iron core (3) and the segmented rotor iron core (4) are installed in a matched mode through the flat key (2) and the multi-key-groove main shaft (1) to form a segmented skewed pole permanent magnet synchronous motor rotor;

the first segmented rotor core (4) and the second segmented rotor core (3) are completely symmetrical in structure, the same rotor punching sheets are used, and the front side and the back side are interchanged only during assembly;

an inner hole of the first segmented rotor core (3) connected with the main shaft is provided with a first eccentric key groove (5) and a second eccentric key groove (6), the first eccentric key groove (5) and the second eccentric key groove (6) are symmetrically distributed on two sides of the transverse shaft, but are on the same side of the longitudinal shaft to form an eccentric structure, and the eccentric angles are the same;

the first key groove (7), the second key groove (8) and the third key groove (9) are arranged on the multi-key-groove main shaft (1) in a staggered mode.

2. The segmented skewed pole rotor structure of claim 1, wherein the number of keyways on the multi-keyway spindle (1) is the number of rotor core segments minus 1.

3. The segmented skewed pole rotor structure of claim 1, wherein the first eccentric key slot (5) of the first segmented rotor core (3) coincides with the first key slot (7) of the multi-key-slot spindle (1); a first eccentric key groove (5) on the second section of the second segmented rotor core (4) is superposed with a first key groove (7) on the multi-key-groove main shaft (1), and a second eccentric key groove (6) on the first segmented rotor core (4) is superposed with a second key groove (8) on the multi-key-groove main shaft (1); a first eccentric key groove (5) on the third section of the first segmented rotor core (3) is superposed with a third key groove (9) on the multi-key-groove main shaft (1), and a second eccentric key groove (6) on the first segmented rotor core (3) is superposed with a second key groove (8) on the multi-key-groove main shaft (1); a first eccentric key groove (5) on the fourth section of second segmented rotor core (4) is overlapped with a third key groove (9) on the multi-key-groove main shaft (1).

4. The segmented skewed pole rotor structure of claim 1, wherein the first segmented rotor core (3) and the fourth segmented rotor core (4) are only matched with the multi-keyway spindle (1) through one flat key (2), and the second segmented rotor core (4) and the third segmented rotor core (3) are matched with the multi-keyway spindle (1) through two flat keys (2).

5. The permanent magnet synchronous motor segmented skewed pole rotor structure of claim 1, wherein the skewed pole angle is controlled by the eccentric angle of the first eccentric key slot (5), the second eccentric key slot (6), and the staggered angle between the first key slot (7), the second key slot (8) and the third key slot (9).