Permanent magnet motor with rotary transformer

Abstract

The utility model discloses a permanent magnet motor with a rotary transformer. The permanent magnet motor comprises a stator, a rotor, a casing, a front end cover and a rear end cover, the casing is located between the front end cover and the rear end cover, and the casing, the front end cover and the rear end cover define an accommodating cavity for accommodating the stator and the rotor; the middle part of the rotor penetrates through the stator, and the stator is fixedly arranged on the shell; the front end cover and the rear end cover are located at the two ends of the rotor respectively, and a rotary transformer is installed on the rear end cover. A mark is arranged on the casing, a fixed angle is formed between the mark and a positioning groove of the stator, and the positioning groove is one stator groove of the stator. Due to the adoption of the technical scheme, compared with the prior art, when different motors with the same specification are produced on a large scale, the initial position angles of the motor and the rotary transformer are kept consistent, the angle deviation is the machining tolerance in the motor manufacturing process, and only the angle of the rotary transformer stator needs to be slightly adjusted.

Description

Technical Field

[0001] The utility model relates to the field of motors, and particularly to a permanent magnet motor with a resolver. Background Art

[0002] In a permanent magnet synchronous motor speed regulation system using field-oriented control, it is necessary to detect the rotor position and speed of the motor in real time to achieve closed-loop control of torque and speed. The resolver has been widely used in permanent magnet motors that require fast response due to its advantages such as high temperature resistance and earthquake resistance. To accurately obtain the position and speed of the motor rotor, the resolver as a position detection element needs to be accurately positioned at its initial position during installation. How to make the permanent magnet motors produced in large quantities maintain the same initial position angle when leaving the factory, while simplifying the work difficulty of adjusting the resolver angle during assembly as much as possible and improving the adjustment efficiency is a difficult problem in the design of permanent magnet motors.

[0003] The utility model patent with the publication number CN208862702U discloses an installation structure for controlling a permanent magnet motor and a resolver, including a motor and a resolver. The motor includes a stator, a rotor, a housing, and a rear end cover. The resolver includes a resolver stator and a resolver rotor. By determining the positions between the stator, rotor, housing, rear end cover, and resolver rotor, the relative position between the resolver stator and the rear end cover is obtained, and end cover screw holes are pre-processed on the rear end cover so that after the resolver stator is zeroed, the positioning holes of the resolver stator and the end cover screw holes can be directly installed and fixed by screws. Its disadvantages are as follows: Since the position of the starting stator slot of the first U phase is not fixed, it is impossible to make the center line of the U-phase winding of the motor form a fixed angle with the zero line of the resolver, resulting in the resolver being unable to maintain the same initial position angle when the permanent magnet motors produced in large quantities leave the factory. Summary of the Invention

[0004] This application provides a permanent magnet motor with a resolver, which solves the technical problem that in the prior art, it is impossible to make the center line of the U-phase winding of the motor form a fixed angle with the zero line of the resolver, resulting in the resolver being unable to maintain the same initial position angle when the permanent magnet motors produced in large quantities leave the factory.

[0005] To achieve the above object, this application adopts the following technical solutions.

[0006] Provide a motor with a resolver, including a stator, a rotor, a housing, and an end cover; the housing and the end cover enclose a receiving cavity for receiving the stator and the rotor; the middle of the rotor passes through the stator, and the stator is fixedly installed on the housing; a resolver is installed on the end cover; a mark is provided on the housing, and a positioning groove is provided on the stator; a fixed angle is formed between the positioning groove and the starting stator slot of the first U phase of the stator, and a fixed angle is formed between the mark and the positioning groove.

[0007] Since the deviation in the installation angle between the end cover and the housing or the stator will be superimposed on the resolver angle, in some embodiments, the housing is provided with mounting holes, and the end cover is mounted on the housing through the mounting holes, and a fixed angle is formed between the mounting holes and the marks.

[0008] In some embodiments, a rotor retaining ring is sleeved on the rotor. The rotor is provided with a first cooling channel and a first keyway, and the rotor retaining ring is provided with a second cooling channel and a second keyway that mates with the first keyway; the rotor and the rotor retaining ring are mounted in cooperation through the first keyway and the second keyway, and the first cooling channel communicates with the second cooling channel.

[0009] In some embodiments, a fixed angle is formed between the central axis of the first keyway and the d-axis axis corresponding to the N pole of the rotor.

[0010] In some embodiments, the resolver includes a resolver stator and a resolver rotor. The resolver rotor is mounted on the rotor. The resolver rotor is provided with a third keyway, and a fixed angle is formed between the third keyway and the first keyway.

[0011] In some embodiments, the positioning groove is the starting groove of the first U phase, and a fixed angle is formed between the axis of the first U phase and the d-axis axis corresponding to the salient pole of the resolver rotor.

[0012] In some embodiments, a fixed angle is formed between the d-axis axis corresponding to the salient pole of the resolver rotor and the zero position line of the resolver stator.

[0013] In some embodiments, the resolver stator is provided with kidney-shaped holes, and the resolver stator is mounted on the end cover through the kidney-shaped holes.

[0014] In some embodiments, the rotor and the resolver rotor are integrated.

[0015] In some embodiments, the shape of the housing is an annular tube, and the outer side of the stator is fixedly connected to the inside of the housing; or

[0016] The housing includes a first flange and a second flange, and the end cover includes a front end cover and a rear end cover; one side of the first flange is fixedly connected to the front end cover, and the other side is fixedly connected to one side of the stator; one side of the second flange is fixedly connected to the other side of the stator, and the other side is fixedly connected to the rear end cover.

[0017] The present application has at least the following technical effects or advantages: When mass-producing motors of the same specification but different models, the initial position angles of the motors and resolvers are kept consistent, and the angular deviation is the machining tolerance during the motor manufacturing process. Only slight adjustment of the resolver stator angle is required. Secondly, it can also ensure that the rotor retaining ring is aligned with the cooling channels on the rotor punching sheet. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 FIG. is a schematic structural diagram of a motor with a resolver in an embodiment of the present application;

[0019] Figure 2 FIG. is a sectional view of a motor with a resolver in an embodiment of the present application (Structure 1);

[0020] Figure 3 is Figure 2 a partially enlarged schematic view of area A in;

[0021] Figure 4 FIG. is a sectional view of a motor with a resolver in an embodiment of the present application (Structure 2);

[0022] Figure 5 FIG. is a schematic structural diagram of a rotor shaft and a resolver rotor in an embodiment of the present application;

[0023] Figure 6 FIG. is a schematic structural diagram of a rotor retaining ring in an embodiment of the present application;

[0024] Figure 7 FIG. is a schematic structural diagram of a resolver stator in an embodiment of the present application. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0025] In order to better understand the above technical solutions, the above technical solutions will be described in detail below in conjunction with the accompanying drawings of the specification and specific embodiments.

[0026] Referring to Figures 1 - 4 , a motor with a resolver includes a stator 1, a rotor, a housing 3, a front end cover 41, and a rear end cover 42. The housing 3 is located between the front end cover 41 and the rear end cover 42, and the housing 3, the front end cover 41, and the rear end cover 42 enclose a receiving cavity for receiving the stator 1 and the rotor. The rotor includes a rotor shaft 21 and a rotor punching sheet 22. The middle of the rotor shaft 21 passes through the stator 1, and the stator 1 is fixedly installed on the housing 3. The front end cover 41 and the rear end cover 42 are respectively located at both ends of the rotor shaft 21, and a resolver 5 is installed on the rear end cover 42.

[0027] There is a mark 31 on the housing 3, and a positioning groove 11 is provided on the stator 1. There is a fixed angle between the positioning groove 11 and the starting stator groove of the first U-phase in the stator grooves of the stator 1 (preferably, this angle is 0, that is, the positioning groove 11 is the starting stator groove of the first U-phase in the stator grooves of the stator 1), and there is a fixed angle between the mark 31 and the positioning groove 11 of the stator 1 (preferably, this angle is 0, that is, the mark 31 is aligned with the positioning groove 11). There are also mounting holes 32 on the housing 3, and the rear end cover 42 is installed on the housing 3 through the mounting holes 32. There is a fixed angle between the mounting holes 32 and the mark 31, such as 30°, as Figure 1 shown. The mark 31 can be a convex structure or a certain kind of mark, such as a mark engraved with a pen, paint or laser.

[0028] As Figure 2 , Figure 4 , Figure 5 and Figure 6 shown, there is a first keyway 81 on the rotor shaft 21, and a first cooling channel 71 is provided on the rotor punching 22. A rotor retaining ring 6 is sleeved on the rotor shaft 21, and a second cooling channel 72 and a second keyway 82 matching with the first keyway 81 are provided on the rotor retaining ring 6. The rotor punching 22 and the rotor retaining ring 6 are installed by the cooperation of the first keyway 81 and the second keyway 82, and the first cooling channel 71 is communicated with the second cooling channel 72. There is a fixed angle between the central axis of the first keyway 81 and the d-axis axis corresponding to the N pole of the rotor 1 (preferably, this angle is 0, that is, they are aligned).

[0029] As Figure 3 , Figure 5 and Figure 7 shown, the resolver 5 includes a resolver stator 51 and a resolver rotor 52. The resolver rotor 52 is installed on the rotor shaft 21. A kidney-shaped hole 53 is provided on the resolver stator 51, and the resolver stator 51 is installed on the rear end cover 42 through the kidney-shaped hole 53. Preferably, the rotor shaft 21 and the resolver rotor 52 are integrated.

[0030] As Figure 5 shown, there is a third keyway 83 on the resolver rotor 52. There is a fixed angle between the third keyway 83 and the first keyway 81 (preferably, this angle is 0, that is, the third keyway 83 is aligned with the first keyway 81). There is a fixed angle between the axis of the first U-phase of the stator groove and the d-axis axis corresponding to the salient pole of the resolver rotor 52 (preferably, this angle is 0, that is, they are aligned). There is a fixed angle between the d-axis axis corresponding to the salient pole of the resolver rotor 52 and the zero line of the resolver stator 51 (preferably, this angle is 0, that is, they are aligned).

[0031] As Figure 2As shown, the housing 3 may include a first flange 33 and a second flange 34. One side of the first flange 33 is fixedly connected to the front end cover 31, and the other side is fixedly connected to one side of the stator 1. One side of the second flange 34 is fixedly connected to the other side of the stator 1, and the other side is fixedly connected to the rear end cover 42.

[0032] As Figure 4 shown, the housing 3 may also be an annular tube, and the outside of the stator 1 is fixedly connected to the inside of the housing 3.

[0033] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments or perform equivalent replacements for some of the technical features. However, such modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A permanent magnet motor with a rotary transformer, comprising a stator, a rotor, a housing and an end cover; the housing and the end cover form a receiving cavity for receiving the stator and the rotor; the middle part of the rotor passes through the stator, and the stator is fixedly mounted on the housing; the end cover is mounted with a rotary transformer; the characteristics are: The housing is provided with a mark, and the stator is provided with a positioning groove; the positioning groove and the starting stator groove of the first U phase of the stator form a fixed angle, and the mark and the positioning groove form a fixed angle.

2. The permanent magnet motor with a rotary transformer according to claim 1, characterized in that: The casing is provided with a mounting hole, and the end cover comprises a front end cover and a rear end cover; the rear end cover is mounted on the casing through the mounting hole, and a fixed angle is formed between the mounting hole and the mark.

3. The permanent magnet motor with a rotary transformer according to claim 2, characterized in that: The rotor is sleeved with a rotor pressing ring, the rotor is provided with a first cooling channel and a first keyway, the rotor pressing ring is provided with a second cooling channel and a second keyway matching the first keyway; the rotor and the rotor pressing ring are installed by matching the first keyway and the second keyway, and the first cooling channel is connected to the second cooling channel.

4. The permanent magnet motor with a rotary transformer according to claim 3, characterized in that: A central axis of the first keyway forms a fixed angle with an axis of the d-axis corresponding to the N pole of the rotor.

5. The permanent magnet motor with a rotary transformer according to claim 4, characterized in that: The rotary transformer comprises a rotary transformer stator and a rotary transformer rotor. The rotary transformer rotor is mounted on the rotor. A third keyway is provided on the rotary transformer rotor. The third keyway forms a fixed angle with the first keyway.

6. The permanent magnet motor with a rotary transformer according to claim 5, characterized in that: The positioning groove is a starting groove of the first U phase, and the axis of the first U phase forms a fixed angle with the axis of the d-axis of the corresponding salient pole of the resolver rotor.

7. The permanent magnet motor with a rotary transformer according to claim 6, characterized in that: A fixed angle is formed between the d-axis axis of the resolver rotor corresponding to the salient pole and the zero line of the resolver stator.

8. The permanent magnet motor with a rotary transformer according to claim 5, characterized in that: The resolver stator is provided with a waist-shaped hole, and the resolver stator is installed on the rear end cover through the waist-shaped hole.

9. The permanent magnet motor with a rotary transformer according to claim 5, characterized in that: The rotor is integrated with the resolver rotor.

10. The permanent magnet motor with a rotary transformer according to claim 2, characterized in that: The housing is in the shape of an annular tube, and the outer side of the stator is fixedly connected to the inner side of the housing; or The housing includes a first flange and a second flange, one side of the first flange is fixedly connected to the front end cover, and the other side is fixedly connected to one side of the stator; one side of the second flange is fixedly connected to the other side of the stator, and the other side is fixedly connected to the rear end cover.

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