CN115642726A

CN115642726A - Vehicle permanent magnet motor rotor with oblique poles in any sections and design method

Info

Publication number: CN115642726A
Application number: CN202211388002.3A
Authority: CN
Inventors: 谭平; 陈建文; 李仕平; 肖强; 王艳艳; 欧阳宏; 刘东浩
Original assignee: Jianglu Machinery and Electronics Group Co Ltd
Current assignee: Jianglu Machinery and Electronics Group Co Ltd
Priority date: 2022-11-07
Filing date: 2022-11-07
Publication date: 2023-01-24

Abstract

The invention discloses an automotive permanent magnet motor rotor with oblique poles in any sections, which relates to the technical field of motors and solves the technical problems of high investment cost, difficult visual inspection and incomplete consideration in the prior art, and comprises a rotating shaft, wherein the rotating shaft is axially provided with a flat key groove, a flat key is inserted into the flat key groove, a plurality of sections of rotor iron core components are stacked on the rotating shaft, each rotor iron core component is formed by laminating a plurality of rotor punching sheets, the plurality of sections of rotor iron core components are arranged in an oblique pole manner, and rotor end plates are mounted at two ends of the rotating shaft; the invention realizes the rotor segmented oblique pole, is suitable for any linear, V-shaped and any deformation structure rotor multi-segment oblique pole structure, can solve the problem of rotor structure diversity in the related technology, improves NVH performance, realizes visual detection, simplifies the manufacturing process and reduces the production cost.

Description

Vehicle permanent magnet motor rotor with oblique poles in any sections and design method

Technical Field

The invention relates to the technical field of motors, in particular to a permanent magnet motor rotor for an automobile with an arbitrarily segmented oblique pole and a design method.

Background

The motor driving system is used as a core component of the electric automobile, the performance of the motor driving system directly influences the performance of the whole automobile, and the permanent magnet synchronous motor becomes the first choice of the energy automobile by virtue of the characteristics of high efficiency, high power density, high torque density and the like. The cogging torque generated due to the non-sine of the field of the permanent magnet synchronous motor and the stator cogging is one of the main causes of NVH (Noise, vibration, and Harshness) of the motor. In order to effectively reduce the cogging torque, a stator skewed slot, a rotor skewed pole and an auxiliary slot arranged on a rotor are often adopted, the rotor skewed pole is formed by staggering magnetic poles at a certain angle, so that the cogging effect caused by stator slotting is reduced, for a segmented skewed pole motor, because the angles of the magnetic steels facing in different rotor core sections are different, the composite air gap magnetic density waveforms on different segments of the segmented skewed pole motor are different, and the segmented skewed pole motor mainly has a deformed rotor multi-segment skewed pole structure such as a linear structure, a V-shaped structure, a ZigZag structure and the like. The rotor auxiliary groove is formed in the rotor punching sheet, so that the air gap flux density waveform is optimized.

At present, a lot of patents related to segmented oblique poles exist in China, for example, the Chinese patent application with the publication number of CN 214380351U, the relative positions of magnetic poles of each segment of rotor are different, so that each segment of rotor core is required to be processed and formed by a rotor punching die, the investment cost of the die is greatly increased, and the manufacturing difficulty is greatly increased. For example, in the chinese patent application with publication number CN 210404878U, it is not fully considered that the forward and reverse assembly has operation errors and processing errors in the actual assembly process, and a high-precision, direct, and fast detection scheme is not provided, and it is difficult to determine whether each rotor skewed pole unit has completed skewed pole torsion, whether the NS pole is assembled correctly, and the influence of the forward and reverse assembly burrs is not considered. The calculation formula given as application publication No. CN 111953100A only considers the number of slots, and does not consider the influence of the pole pair number. Therefore, the above patent has problems of high investment cost, difficulty in visual inspection, and insufficient comprehensive consideration.

Disclosure of Invention

The invention aims to: in order to solve the technical problem, the invention provides a permanent magnet motor rotor for a vehicle with an arbitrarily segmented skewed pole and a design method.

The invention specifically adopts the following technical scheme for realizing the purpose:

the utility model provides an arbitrary segmentation oblique polar automobile-used permanent-magnet machine rotor, includes the pivot, and the flat key groove has been seted up along the axial to the pivot, and the flat key inslot inserts and is provided with the flat key, and the stack is equipped with a plurality of sections rotor core subassemblies in the pivot, and the rotor core subassembly is folded by a plurality of rotor punching and is pressed and form, and multistage rotor core subassembly is oblique polar arrangement, and the rotor end plate is installed at the both ends of pivot.

Furthermore, a plurality of key grooves are formed in the inner diameter of each rotor punching sheet along the circumferential direction, and the same rotor iron core component is formed by laminating the same type of rotor punching sheets.

Furthermore, a plurality of positioning grooves parallel to the axial direction of each rotor punching sheet are formed in the outer diameter of each rotor punching sheet along the circumferential direction, and the same rotor core component is formed by laminating the same type of rotor punching sheets.

In addition, the invention also provides a design method of the permanent magnet motor rotor for the vehicle with any segmented oblique poles, which comprises the following steps:

step S1, a plurality of key grooves are formed in the inner diameter of each rotor punching sheet along the circumferential direction, a plurality of positioning grooves are formed in the outer diameter of each rotor punching sheet along the circumferential direction, and the same type of rotor punching sheet is laminated to form a section of rotor iron core assembly, so that a plurality of sections of rotor iron core assemblies are obtained;

step S2, arranging a flat key groove on the rotating shaft along the axial direction, penetrating the flat key through the flat key groove, and sequentially stacking the multiple sections of rotor iron core components obtained in the step S1 on the rotating shaft, wherein one key groove of two adjacent sections of rotor iron core components is overlapped, and the center line of a magnetic pole has an angle difference in the circumferential direction;

and S3, filling by using a fixing agent, and mounting rotor end plates at two ends of the rotating shaft.

Further, in step S1, the number of keyways N = N, N < P; wherein n is the different position degrees of the magnetic pole central line of the rotor core component in the circumferential direction, and P is the pole pair number.

Further, in step S1, one of the key slots on each of the rotor sheets is set as a first key slot, and one side of the first key slot is provided with a mark slot.

Furthermore, the included angle between every two adjacent key slots is alpha, and the included angle between the first key slot and the Nth key slot is (360- (N-1) × alpha).

Further, the calculation formula of the included angle α is:

α<180°

N×α<360°。

furthermore, a plurality of positioning grooves are sequentially distributed on each rotor punching sheet along the circumferential direction according to the NSNS rule of the magnetic steel.

Further, in step S2, the total oblique pole angle of the magnetic pole center line = (360/m) × (n-1)/n, where m is a common multiple of the number of slots of the stator of the motor and the number of poles of the rotor, and n is different position degrees of the magnetic pole center line of the rotor core assembly in the circumferential direction.

The invention has the following beneficial effects:

according to the invention, according to different positions of the magnetic pole center line of the rotor core assembly in the circumferential direction, a plurality of circumferential key grooves are arranged in the inner diameter of the rotor punching sheet, the rotor core is manufactured by utilizing the same set of rotor punching sheet punching and laminating dies, and different angles are rotated according to design requirements during assembly to enable one of the key grooves to coincide, so that the rotor is segmented and has an oblique pole.

Drawings

FIG. 1 is a schematic view of the motor construction of the present invention;

FIG. 2 is a schematic structural diagram of a rotor sheet and an iron core with two-position V-shaped grooves according to an embodiment of the present invention;

FIG. 3a is a schematic diagram of two position-degree V-groove in-line segmented rotor core laminations in an embodiment of the present invention;

FIG. 3b is a schematic diagram of two position V-groove V-shaped segmented rotor cores laminated in accordance with an embodiment of the present invention;

FIG. 3c is a schematic diagram illustrating the included angles of the key slots of the two-position V-groove rotor sheets according to the embodiment of the present invention;

FIG. 3d is a schematic view of a multi-stage slant-pole laminated main view of a V-shaped groove-in-line and V-shaped rotor with two positions according to an embodiment of the present invention;

FIG. 4a is a schematic diagram of an exemplary stacked arrangement of three position V-groove linear segmented rotor cores in accordance with an embodiment of the present invention;

FIG. 4b is a schematic diagram of an exemplary stacked three-position V-groove V-segment rotor core of an embodiment of the present invention;

FIG. 4c is a schematic diagram of included angles of key slots of an example one of three position-degree V-groove rotor laminations in an embodiment of the present invention;

FIG. 4d is a schematic view of an example of a laminated main structure of a multi-stage slant pole of a three-dimensional V-shaped groove linear and V-shaped rotor according to an embodiment of the present invention;

FIG. 5a is a schematic diagram of an exemplary two-fold lamination of a three-position degree V-groove linear segmented rotor core in an embodiment of the present invention;

FIG. 5b is a schematic diagram of an exemplary two-fold stack of three position degree V-groove V-shaped segmented rotor cores in an embodiment of the present invention;

FIG. 5c is a schematic diagram of included angles of key slots of an example two of a three-position degree V-groove rotor sheet in an embodiment of the present invention;

fig. 5d is a schematic view of an example of two-fold pressing of a multi-segment oblique pole of a three-position degree V-shaped groove linear and V-shaped rotor in the embodiment of the present invention.

Reference numerals: 1-a first keyway; 2-a second keyway; 3-a mark slot; 4-N pole concave groove; 5-S pole concave groove.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Example 1

As shown in fig. 1, this embodiment provides an arbitrary segmentation oblique polar automobile-used permanent magnet motor rotor, including the pivot, the flat keyway has been seted up along the axial to the pivot, and the flat keyway inserts and is provided with the flat key, and the stack is equipped with a plurality of sections rotor core subassemblies in the pivot, and the rotor core subassembly is laminated by a plurality of rotor punching sheets and is formed, and multistage rotor core subassembly is oblique polar arrangement, and the rotor end plate is installed at the both ends of pivot.

Example 2

This embodiment is explained with respect to the structure of the rotor core assembly on the basis of embodiment 1.

As shown in fig. 1, a plurality of key slots are formed in the inner diameter of each rotor sheet along the circumferential direction, and the same rotor core assembly is formed by laminating the same type of rotor sheets.

The outer diameter of the rotor punching sheet is provided with positioning grooves which are different in quantity and parallel to the axial direction of the rotor punching sheet according to the NS pole alternate arrangement rule, the number of the grooves under the same pole is equal, lamination of the punching sheet and lamination visual inspection of a rotor iron core assembly are facilitated, and the rotor punching sheet is also used for quickly and accurately judging and identifying the position of the N, S magnetic steel during assembly.

Example 3

On the basis of the above embodiment, the present invention further provides a method for designing a vehicle permanent magnet motor rotor with an arbitrarily segmented skewed pole, including the following steps:

step S1, a plurality of key grooves are formed in the inner diameter of each rotor punching sheet along the circumferential direction, a plurality of positioning grooves are formed in the outer diameter of each rotor punching sheet along the circumferential direction, and the same type of rotor punching sheets are laminated to form a section of rotor iron core assembly, so that a plurality of sections of rotor iron core assemblies are obtained;

Example 4

This embodiment is specifically explained about step S1 on the basis of the above embodiment.

Further, in step S1, the number of keyways N = N, N < P; wherein n is the different position degree of magnetic pole central line of rotor core subassembly in the circumferencial direction, and P is the pole pair number.

Furthermore, in step S1, one of the key slots on each rotor sheet is set as a first key slot 1, and one side of the first key slot 1 is provided with a mark slot 3.

Specifically, the rotor punching sheet inner diameter is equipped with the keyway, and the keyway quantity is decided by the different quantity in the circumferencial direction position of the magnetic pole central line of rotor core subassembly. The 1 st keyway on the rotor punching is the benchmark keyway, is equipped with asymmetric mark groove 3, is convenient for discern rotor punching and is folded and press direction and rotor core subassembly closed assembly direction.

Furthermore, the included angle between every two adjacent key slots is α, and the included angle between the first key slot 1 and the nth key slot is (360- (N-1) × α).

Further, the calculation formula of the included angle α is:

α<180°

N×α<360°。

Example 5

This embodiment is specifically explained with respect to step S2 on the basis of the above embodiment.

The rotor consists of a rotating shaft, n sections of rotor core assemblies, rotor baffles, a flat key and the like; a flat key groove extending along the axial direction is formed in the rotating shaft, and the rotor core assembly is sequentially stacked on the motor rotating shaft in a clockwise or anticlockwise direction by penetrating the flat key groove through the flat key; then encapsulating epoxy resin or adhesive, and installing rotor end plates at two ends. When the multi-section rotor core assemblies are stacked, the difference between the central lines of the magnetic poles in the circumferential direction is a certain angle, and the total oblique pole angle = (360/m) × (n-1)/n, wherein m is the number of slots of the motor stator.

Example 6

This example specifically explains the present invention based on the above examples.

As shown in fig. 1, the number of pole pairs P =8, the number of stator slots m =96, and the rotor slot type is a V-shaped slot.

As shown in fig. 2, the outer diameter N pole of the rotor sheet corresponds to 2N pole concave grooves 4,S, and corresponds to 1S pole concave grooves 5,N, S are arranged in sequence along the circumference in a staggered manner, and the concave grooves are distributed in sequence along the circumference along the NSNS rule. Rotor punching internal diameter is equipped with 2 keyways, first keyway 1 is the benchmark keyway, the upper left corner of this keyway sets up a mark groove 3, be used for distinguishing with other keyways, mark groove 3 position is in the upper left corner as the front of folding the rotor punching, also as rotor core closed assembly in the front of pivot direction, second keyway 2 and the certain angle of 1 skew of first keyway, the left side view is the rotor core after closed assembly, because the inconsistency of fluting position, can fold the exactness of pressing through the surface quick range estimation.

As shown in fig. 3a and 3b, the structure is a "linear" or "V-shaped" rotor multi-stage oblique structure with two positions V-shaped grooves, which is formed by stacking 8 small segments, the left side view shows that the rotor core has two positions, and the included angle between the second key groove 2 and the first key groove 1 is:

taking M =4;

n＝N＝2

the angle between the second key groove 2 and the first key groove 1 is 178.125 °, see fig. 3c.

As shown in fig. 3d, the main schematic diagram of "linear" and "V-shaped" rotor multi-stage oblique-pole lamination is shown, and it can be seen from the figure that N poles are at the same position, and S poles are at the same position, so as to detect the correctness of lamination and the consistency of magnetic field directions.

As shown in fig. 4a-4d, an example of a V-shaped groove multi-stage slant-pole structure with three position degrees is shown, wherein fig. 4a is a "straight" rotor multi-stage slant-pole structure, fig. 4b is a "V-shaped" rotor multi-stage slant-pole structure, and the rotor core is formed by stacking 6 segments, and it can be seen from the left side that there are three position degrees, 3 key slots are formed in the inner diameter of the rotor sheet, the included angle between the second key slot 2 and the first key slot 1 is α, and the included angle between the third key slot (not shown in the figure) and the second key slot 2 is α.

Taking M =1;

n＝N＝3

the angle between the second key groove 2 and the first key groove 1 is equal to the angle between the third key groove and the second key groove 2, specifically 43.75 °, see fig. 4c.

As shown in fig. 4d, the main schematic diagram of "linear" and "V-shaped" rotor multi-stage oblique-pole lamination is shown, and it can be seen from the figure that N poles are at the same position, and S poles are at the same position, so as to detect the correctness of lamination and the consistency of magnetic field directions.

As shown in fig. 5a-5d, the structure is an example two of a three-position V-shaped groove multi-segment oblique pole structure, fig. 5a is a "straight-line" rotor multi-segment oblique pole structure, fig. 5b is a "V-shaped" rotor multi-segment oblique pole structure, and the structure is formed by stacking 6 segments, and it can be seen from a left side view that a rotor core has three position degrees, 3 key grooves are formed in the inner diameter of a rotor sheet, an included angle between a second key groove 2 and a first key groove 1 is α, and an included angle between a third key groove and the second key groove 2 is α.

Taking M =2;

n＝N＝3

the angle between the second key groove 2 and the first key groove 1 is equal to the angle between the third key groove and the second key groove 2, specifically 88.75 °, see fig. 5c.

As shown in fig. 5d, the main schematic diagram of "linear" and "V-shaped" rotor multi-stage oblique-pole lamination is shown, and it can be seen from the figure that N poles are at the same position, and S poles are at the same position, so as to detect the correctness of lamination and the consistency of magnetic field directions.

The above description only describes the specific implementation of the technical solution of the present invention by taking the 16-pole motor as an equivalent divided into 8 segments and 6 segments as an example, but the scope of the present invention is not limited thereto, and the present invention is applicable to all permanent magnet motors with built-in magnetic steel, including a linear slot, a V-shaped slot, a double V, etc., the segmented structure of the skewed pole includes a linear type, a V-shaped, and other modified structures, the pole pair includes but is not limited to 4 poles, 6 poles, 8 poles, 10 poles, etc., the principle of the method is the same, and any person skilled in the art can be within the technical scope of the present invention, and the equivalent replacement or change according to the technical solution of the present invention and the inventive concept thereof should be covered within the scope of the present invention.

Claims

1. The utility model provides an arbitrary segmentation oblique polar automobile-used permanent-magnet machine rotor, a serial communication port, including the pivot, flat keyway has been seted up along the axial in the pivot, flat keyway inserts and is provided with the parallel key, and the stack is equipped with a plurality of sections rotor iron core group spare in the pivot, rotor iron core group spare is folded by a plurality of rotor punching and is pressed and form, and multistage rotor iron core group spare is the oblique polar arrangement, and the rotor end plate is installed at the both ends of pivot.

2. The vehicle permanent magnet motor rotor with the arbitrarily segmented skewed poles as claimed in claim 1, wherein a plurality of key slots are circumferentially formed in the inner diameter of each rotor punching, and the same rotor core assembly is formed by laminating the same type of rotor punching.

3. The automotive permanent magnet motor rotor with the oblique poles at any sections according to claim 1, wherein a plurality of positioning grooves parallel to the axial direction of each rotor punching are formed in the outer diameter of each rotor punching along the circumferential direction, and the same rotor core component is formed by laminating the same type of rotor punching.

4. A method for designing a rotor for a permanent magnet motor for vehicles according to any one of claims 1 to 3, comprising the steps of:

step S2, arranging a flat key groove on the rotating shaft along the axial direction, enabling the flat key to penetrate through the flat key groove, and sequentially stacking the plurality of sections of rotor iron core components obtained in the step S1 on the rotating shaft, wherein one key groove of two adjacent sections of rotor iron core components is overlapped, and the center line of a magnetic pole has an angle difference in the circumferential direction;

and S3, filling by using a fixing agent, and installing rotor end plates at two ends of the rotating shaft.

5. The design method of the permanent magnet motor rotor for the vehicle with the arbitrarily segmented skewed pole is characterized in that the number of the key slots in the step S1 is N = N, N < P; wherein n is the different position degree of magnetic pole central line of rotor core subassembly in the circumferencial direction, and P is the pole pair number.

6. The design method of the permanent magnet motor rotor for the vehicle with the arbitrarily segmented skewed pole is characterized in that in the step S1, one key slot on each rotor sheet is set as a first key slot (1), and a mark slot (3) is formed in one side of the first key slot (1).

7. The design method of the automotive permanent magnet motor rotor with the arbitrarily segmented skewed poles according to claim 6, wherein the included angle between every two adjacent key slots is α, and the included angle between the first key slot (1) and the Nth key slot is (360- (N-1) × α).

8. The method for designing the vehicle permanent magnet motor rotor with the arbitrarily segmented skewed pole according to claim 7, wherein the included angle α is calculated by the formula:

α<180°

N×α<360°。

9. the method for designing the automotive permanent magnet motor rotor with the arbitrarily segmented skewed poles according to claim 4, wherein a plurality of positioning grooves are sequentially distributed on each rotor punching sheet along the circumferential direction according to a magnetic steel NSNS rule.

10. The method as claimed in claim 4, wherein the total pole-slant angle of the pole center line in step S2 = (360/m) × (n-1)/n, where m is a common multiple of the number of slots of the stator of the motor and the number of poles of the rotor, and n is different positions of the pole center line of the rotor core assembly in the circumferential direction.