Assembly structure of permanent magnet motor and rotary transformer

Abstract

The invention discloses an assembly structure of a permanent magnet motor and a rotary transformer, which belongs to the technical field of motors and comprises a motor rotating shaft, a stator core, a rotor core, a base, a bearing inner cover, a rotary transformer stator, a rotary transformer rotor and an end cover. The rotary transformer rotor, the rotary transformer stator and the stator iron core are respectively provided with a datum line, and the datum lines are respectively overlapped with special lines arranged on the corresponding rotor iron core, the bearing inner cover and the machine base. The bearing inner cover and the stator core are detachably connected and can rotate relative to the central shaft so as to adjust the relative position. In the generating process of a single batch of motors, the relative position relation between a rotary transformer rotor and a rotor core, between a rotary transformer stator and a bearing inner cover and between a stator core and a machine base in each motor forms specific standardization through positioning control so as to be assembled, and the consistency of the electric angles of the motors in the same batch is improved; the potential variable parameters in the motor debugging process are reduced, and the debugging program is simplified.

Description

Technical Field

[0001] The invention belongs to the technical field of motors, and in particular relates to an assembly structure of a permanent magnet motor and a resolver. Background Art

[0002] A motor resolver (resolver for short) is a sensor device specifically designed to detect the angle and position of a rotating motor, and can provide high-precision rotor angle feedback information. The working principle of a motor resolver is similar to that of a traditional transformer. It consists of two parts: a stator and a rotor. The stator part usually has an excitation winding. When alternating current is applied to the winding, a magnetic field is generated between the stator and the rotor. The rotor part has an induction winding. As the motor rotates, the rotor moves in the magnetic field, which causes changes in the output signal. The signal output by the resolver changes according to the angle and position of the rotor. Through the signal processing circuit, the output can be converted into an angle or speed signal to achieve accurate angle measurement.

[0003] The resolver of a traditional automotive permanent magnet motor is installed on the bearing cover, and a uniform electrical angle is achieved by adjusting the resolver stator. The resolver is installed on the bearing cover, which occupies the axial space and is difficult to meet the use requirements of motors with strict axial dimensions. Some permanent magnet motors with strict axial dimension requirements prefer to shorten the axial dimension of the motor and reduce the space occupied by the motor.

[0004] Compared with the motor structure with the resolver installed on the outer cover of the bearing, the motor structure with the resolver installed on the inner cover of the bearing is more compact. However, the resolver installed on the inner cover of the bearing is not easy to adjust, and it is difficult to meet the consistency of the electrical angle of the same batch of motors. In order to ensure that each motor runs in the best state, each motor needs to be debugged, which increases the difficulty and time of debugging, and requires each controller to correspond to the motor one by one. In order to simplify the debugging of the controller program and ensure that one controller can control the same batch or multiple batches of permanent magnet motors, the consistency of motor installation is extremely important. In addition, the interchangeability of the controller can save a lot of debugging steps and shorten the replacement and maintenance time. Summary of the invention

[0005] The object of the present invention is to provide an assembly structure of a permanent magnet motor and a resolver to solve the above-mentioned problems in the prior art.

[0006] Provided is an assembly structure of a permanent magnet motor and a resolver, comprising:

[0007] Motor shaft, stator core, rotor core, base, bearing inner cover, resolver stator, resolver rotor and end cover;

[0008] The stator core is interference-fitted in the base, the rotor core is fixedly sleeved on the periphery of the motor shaft and arranged opposite to the inner ring of the stator core, the resolver stator is interference-fitted in the bearing inner cover, the resolver rotor is fixedly sleeved on the periphery of the motor shaft and arranged opposite to the inner ring of the resolver stator, and the end cover is fixedly connected to the base;

[0009] A reference line is set on the resolver rotor, and the reference line coincides with a special line set on the rotor core;

[0010] A reference line is set on the resolver stator, and the reference line coincides with a special line set on the bearing inner cover;

[0011] A reference line is arranged on the stator core, and the reference line coincides with a special line arranged on the base;

[0012] The bearing inner cover is detachably connected to the end cover and can rotate relative to the central axis to adjust the relative position with the stator core.

[0013] As a further solution of the present invention: after the rotor core is fixedly sleeved on the periphery of the motor shaft, a keyway is machined on the motor shaft, and the center line of the keyway on the motor shaft coincides with the center line of the N pole on the rotor core; the keyway on the resolver rotor and the keyway on the motor shaft are positioned by key matching, and the resolver rotor is interference fit on the periphery of the motor shaft. The keyway machining of the motor shaft is performed after the rotor core and the motor shaft are assembled, so as to accurately control the center line of the keyway on the motor shaft as the reference line to coincide with the special line on the rotor core, thereby forming a standardized assembly for the positional relationship between the resolver rotor and the rotor core.

[0014] As a further solution of the present invention: a keyway is provided on the outer ring of the resolver stator, and a positioning hole is provided on the side of the bearing inner cover relative to the resolver stator. When the resolver stator and the bearing inner cover are interference fit, a guide pin is passed through the positioning hole on the bearing inner cover and the guide pin and the keyway are used to limit the movement direction of the resolver stator. Through the positioning of the keyway, the positioning hole and the guide pin, the positional relationship between the resolver stator and the bearing inner cover forms a standardized assembly.

[0015] As a further solution of the present invention: end plates are respectively provided at both ends of the stator core, and the two end plates are tightened by a buckle, a protrusion is formed on the outer ring of at least one end plate, and a key slot is provided on the inner ring of the base, and when the stator core and the base are interference fit, the protrusion of the end plate and the key slot of the base cooperate with each other. The end cover is used to press the stacked punching sheets of the stator core to ensure that the stator teeth will not open, and in addition, the positional relationship between the stator core and the base is standardized by positioning the protrusion on the end cover and the key slot on the base.

[0016] As a further solution of the present invention: a plurality of waist-shaped holes are arranged on the end cover along the circumferential direction, and the end cover is detachably connected to the bearing inner cover after bolts penetrate the waist-shaped holes. The waist-shaped holes have a certain extension length, and the bearing inner cover can rotate around the central axis relative to the stator core under the limiting effect between the bolts, so as to facilitate the adjustment of the electrical angle.

[0017] As a further solution of the present invention: the side wall of the bearing inner cover extends outward to form a sleeve, and the rotary stator is interference-fitted with the inner ring of the sleeve. The sleeve provides a bearing base for the rotary stator that is interference-fitted with the bearing inner cover.

[0018] As a further solution of the present invention: the inner ring of the sleeve is provided with a first step, and the resolver stator abuts against the first step after the resolver stator and the sleeve are interference fit. The first step is used to limit the resolver stator and accurately control the assembly position of the resolver stator on the bearing inner cover.

[0019] As a further solution of the present invention: a second step is provided on the motor shaft, and after the resolver rotor and the motor shaft are interference-fitted, the resolver rotor abuts against the second step. The second step is used to limit the resolver rotor and accurately control the assembly position of the resolver rotor on the motor shaft.

[0020] As a further solution of the present invention: a rotary oil seal is arranged between the bearing inner cover and the motor shaft. The space inside the bearing inner cover is filled with lubricating oil for lubricating and cooling the bearing, and the rotary oil seal is used to prevent the lubricating oil from leaking to the resolver rotor position and the inside of the motor.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] During the production process of a single batch of motors, the relative position relationships between the resolver rotor and the rotor core, between the resolver stator and the bearing inner cover, and between the stator core and the base of each motor are positioned and controlled to form a specific standardized assembly process, thereby improving the consistency of the electrical angles of motors in the same batch; reducing the potential variable parameters during the motor debugging process and simplifying the debugging procedure; if there are slight differences in the resolver position angles due to machining tolerances, the relative angular position between the bearing inner cover and the stator core can be adjusted by rotation to ensure that the motors have a uniform electrical angle. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present drawings or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present drawings. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0024] Figure 1 It is a schematic diagram of the overall structure of the permanent magnet motor and the resolver assembly structure;

[0025] Figure 2 It is a partial enlarged view of the rotating structure;

[0026] Figure 3 A schematic diagram of the assembly of a resolver stator and a resolver rotor provided by the present invention;

[0027] Figure 4 A schematic diagram of the assembly of the rotor core and the resolver rotor provided by the present invention;

[0028] Figure 5 A schematic diagram of the assembly of the stator core and the base provided by the present invention;

[0029] Figure 6 This is a schematic structural diagram of the end cover provided by the present invention.

[0030] In the figure: 1. motor shaft; 11. second step; 2. stator core; 21. end plate; 3. rotor core; 4. base; 5. bearing inner cover; 51. sleeve; 52. first step; 6. resolver stator; 7. resolver rotor; 8. end cover; 81. waist-shaped hole; 9. rotary oil seal. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solutions and advantages of the present application clearer, the present application is described and illustrated below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not intended to limit the present application. Based on the embodiments provided in the present application, all other embodiments obtained by ordinary technicians in the field without making creative work are within the scope of protection of the present application.

[0032] Obviously, the drawings described below are only some examples or embodiments of the present application. For ordinary technicians in this field, the present application can also be applied to other similar scenarios based on these drawings without creative work. In addition, it can also be understood that although the efforts made in this development process may be complicated and lengthy, for ordinary technicians in this field related to the content disclosed in this application, some changes in design, manufacturing or production based on the technical content disclosed in this application are just conventional technical means, and should not be understood as insufficient content disclosed in this application.

[0033] However, unnecessary detailed descriptions may be omitted. For example, detailed descriptions of well-known matters and repeated descriptions of substantially the same structures may be omitted. This is to avoid the following description from becoming unnecessarily lengthy and to facilitate understanding by those skilled in the art. In addition, the drawings and the following description are provided to enable those skilled in the art to fully understand the present application and are not intended to limit the subject matter described in the claims.

[0034] See also Figure 1 and Figure 2 As shown, in the embodiment of the present invention, it includes a motor shaft 1, a stator core 2, a rotor core 3, a base 4, a bearing inner cover 5, a resolver stator 6, a resolver rotor 7 and an end cover 8. The stator core 2 is interference-fitted in the base 4, the rotor core 3 is fixedly sleeved on the periphery of the motor shaft 1 and arranged opposite to the inner ring of the stator core 2, the resolver stator 6 is interference-fitted in the bearing inner cover 5, the resolver rotor 7 is fixedly sleeved on the periphery of the motor shaft 1 and arranged opposite to the inner ring of the resolver stator 6, and the end cover 8 is fixedly connected to the base 4. A reference line is set on the resolver rotor 7, and the reference line coincides with a special line set on the rotor core 3. A reference line is set on the resolver stator 6, and the reference line coincides with a special line set on the bearing inner cover 5. A reference line is set on the stator core 2, and the reference line coincides with a special line set on the base 4. The bearing inner cover 5 and the end cover 8 are detachably connected and can rotate relative to the central axis to adjust the relative position with the stator core 2 .

[0035] The two ends of the motor shaft 1 are rotatably connected to the inside of the base 4 through the support of bearings. The rotor core 3 is equipped with permanent magnets and assembled on the periphery of the motor shaft 1. The stator core 2 is wound with an energized coil and assembled inside the base 4. The stator core 2 and the rotor core 3 are arranged opposite to each other. The interaction of the magnetic field and the current between the stator core 2 and the rotor core 3 generates torque, so that the motor shaft 1 rotates.

[0036] The bearing inner cover 5 and the base 4 are usually integrally formed or fixedly connected, and the bearing at one end of the motor shaft 1 is assembled through the bearing inner cover 5. In order to improve the compactness of the motor structure, the resolver is arranged inside the motor through the bearing inner cover 5. Specifically, the resolver stator 6 of the resolver is interference-fitted with the bearing inner cover 5, and the resolver rotor 7 of the resolver is fixedly fitted with the motor shaft 1, and the resolver stator 6 and the resolver rotor 7 are arranged relative to each other.

[0037] In one embodiment, see Figure 3 and Figure 4As shown, a reference line is set on the resolver rotor 7, and the reference line coincides with a special line set on the rotor core 3. Specifically, after the rotor core 3 is fixedly sleeved on the periphery of the motor shaft 1, a keyway is machined on the motor shaft 1, and the center line of the keyway on the motor shaft 1 coincides with the center line of the N pole on the rotor core 3. The keyway on the resolver rotor 7 and the keyway on the motor shaft 1 are positioned by key fitting, and the resolver rotor 7 is interference fit on the periphery of the motor shaft 1.

[0038] Through the cooperation of two keyways and keys, the center line of the keyway on the resolver rotor 7 is made to coincide with the center line of the keyway on the motor shaft 1, so the center line of the keyway on the resolver rotor 7 is the reference line, and the center line of the N pole on the rotor core 3 is the special line. The reference line on the resolver rotor 7 is made to coincide with the special line on the rotor core 3 through the positioning of the keyway, so that the resolver rotor 7 and the rotor core 3 are assembled in a standardized manner. Since it is difficult to control the specific position of the resolver rotor 7 when the resolver rotor 7 and the motor shaft 1 are interference-fitted, the reference line on the resolver rotor 7 and the special line on the rotor core 3 cannot be precisely coincident, so the keyway processing of the motor shaft 1 is performed after the rotor core 3 and the motor shaft 1 are assembled, which can improve the assembly accuracy.

[0039] In one embodiment, a reference line is provided on the resolver stator 6, and the reference line coincides with a special line provided on the bearing inner cover 5. Specifically, a keyway is provided on the outer ring of the resolver stator 6, and a positioning hole is provided on the side of the bearing inner cover 5 relative to the resolver stator 6. When the resolver stator 6 and the bearing inner cover 5 are interference fit, a guide pin penetrates the positioning hole on the bearing inner cover 5 and is limited by the guide pin and the keyway to guide the moving direction of the resolver stator 6.

[0040] Since the thickness of the bearing inner cover 5 is relatively thin, it is difficult to machine the keyway thereon, so a positioning hole is directly opened on the side wall of the bearing inner cover 5, and after the guide pin passes through the positioning hole, a convex positioning structure is realized on the inner ring side wall of the bearing inner cover 5. After the keyway is opened on the resolver stator 6, the precise positioning of the resolver stator 6 and the bearing inner cover 5 is realized through the cooperation of the keyway and the guide pin, so that the resolver stator 6 and the bearing inner cover 5 can be assembled in a standardized manner.

[0041] In one embodiment, see Figure 5As shown, a reference line is set on the stator core 2, and the reference line coincides with a special line set on the base 4. Specifically, the stator core 2 is a composite structure formed by stacking a plurality of stator punching sheets and insulating gaskets in the length direction. End plates 21 are respectively provided at both ends of the stator core 2, and the two end plates 21 are tightened by buckles to press the stator core 2 into a stable whole. A protrusion is formed on the outer ring of at least one end plate 21, and a keyway is provided on the inner ring of the base 4. When the stator core 2 and the base 4 are interference fit, the protrusion of the end plate 21 and the keyway of the base 4 cooperate with each other. The protrusion of the end plate 21 and the keyway of the base 4 are used to achieve precise positioning of the end plate 21 and the base 4, so that the stator core 2 and the base 4 can be assembled in a standardized manner.

[0042] In one embodiment, see Figure 1 , Figure 2 and Figure 6 As shown, a plurality of waist-shaped holes 81 are provided on the circumferential direction of the end cover 8, and the end cover 8 is detachably connected to the bearing inner cover 5 after bolts penetrate the waist-shaped holes 81. The waist-shaped hole 81 is a through hole extending for a certain length in the arc direction, and a plurality of waist-shaped holes 81 are rotationally symmetrically arranged along the central axis of the motor shaft 1. The outer side of the end cover 8 and the bearing outer cover, as well as the inner side of the end cover 8 and the bearing inner cover 5 are connected by bolts. After adjusting the tightness of the bolts, the electrical angle of the bearing inner cover 5 inside the motor can be adjusted through the waist-shaped holes 81. Specifically, if there is a slight difference in the position angle of the resolver due to machining tolerances, the bearing inner cover 5 can be rotated through the waist-shaped holes 81 on the end cover 8, so that the resolver stator 6 and the bearing inner cover 5 rotate around the motor shaft 1 at the same time, thereby adjusting the initial position angle of the motor to ensure that the motor has a uniform electrical angle.

[0043] Since the motor resolver is usually installed on the bearing outer cover, the bearing inner cover 5 is not designed for the resolver installation structure. Therefore, the present application is provided with a sleeve 51 on the side wall of the bearing inner cover 5, and the resolver stator 6 can be interference-fitted with the inner ring of the sleeve 51 to achieve the fixation of the resolver stator 6 and the bearing inner cover 5. The inner ring of the sleeve 51 is provided with a first step 52, and after the resolver stator 6 and the sleeve 51 are interference-fitted, the resolver stator 6 abuts against the first step 52, which is used to limit the resolver stator 6 and accurately control the assembly position of the resolver stator 6 on the bearing inner cover 5.

[0044] The motor shaft 1 is provided with a second step 11, and the resolver rotor 7 abuts against the second step 11 after the resolver rotor 7 is interference-fitted with the motor shaft 1. Under the limitation of the first step 52 and the second step 11, the relative position of the resolver stator 6 and the resolver rotor 7 can be accurately positioned.

[0045] It should be noted that the present application is not limited to the above-mentioned embodiments. The above-mentioned embodiments are only examples, and the embodiments having the same structure as the technical idea and exerting the same effect within the scope of the technical solution of the present application are all included in the technical scope of the present application. In addition, without departing from the scope of the main purpose of the present application, various modifications that can be thought of by those skilled in the art to the embodiments and other methods of combining some of the constituent elements in the embodiments are also included in the scope of the present application.

Claims

1. An assembly structure of a permanent magnet motor and a resolver, characterized in that: include: A motor shaft (1), a stator core (2), a rotor core (3), a base (4), a bearing inner cover (5), a resolver stator (6), a resolver rotor (7) and an end cover (8); The stator core (2) is interference-fitted in the base (4); the rotor core (3) is fixedly sleeved on the periphery of the motor shaft (1) and arranged opposite to the inner ring of the stator core (2); the resolver stator (6) is interference-fitted in the bearing inner cover (5); the resolver rotor (7) is fixedly sleeved on the periphery of the motor shaft (1) and arranged opposite to the inner ring of the resolver stator (6); and the end cover (8) is fixedly connected to the base (4); A reference line is arranged on the resolver rotor (7), and the reference line coincides with a special line arranged on the rotor core (3); A reference line is arranged on the resolver stator (6), and the reference line coincides with a special line arranged on the bearing inner cover (5); A reference line is arranged on the stator core (2), and the reference line coincides with a special line arranged on the base (4); The bearing inner cover (5) and the end cover (8) are detachably connected and can rotate relative to the central axis to adjust the relative position with the stator core (2).

2. The assembly structure of a permanent magnet motor and a resolver according to claim 1, characterized in that: After the rotor core (3) is fixedly sleeved on the periphery of the motor shaft (1), a keyway is machined on the motor shaft (1), and the center line of the keyway on the motor shaft (1) coincides with the center line of the N pole on the rotor core (3); the keyway on the resolver rotor (7) and the keyway on the motor shaft (1) are positioned by key fitting, and the resolver rotor (7) is interference fitted on the periphery of the motor shaft (1).

3. The assembly structure of a permanent magnet motor and a resolver according to claim 1, characterized in that: A keyway is provided on the outer ring of the rotary stator (6), and a positioning hole is provided on a side of the bearing inner cover (5) relative to the rotary stator (6). When the rotary stator (6) and the bearing inner cover (5) are interference fit, a guide pin passes through the positioning hole on the bearing inner cover (5) and is limited by the guide pin and the keyway to guide the moving direction of the rotary stator (6).

4. The assembly structure of a permanent magnet motor and a resolver according to claim 1, characterized in that: End plates (21) are respectively provided at both ends of the stator core (2), and the two end plates (21) are tightened by a buckle plate. A protrusion is formed on the outer ring of at least one end plate (21), and a key slot is provided on the inner ring of the machine base (4). When the stator core (2) and the machine base (4) are interference-fitted, the protrusion of the end plate (21) and the key slot of the machine base (4) cooperate with each other.

5. The assembly structure of a permanent magnet motor and a resolver according to claim 1, characterized in that: A plurality of waist-shaped holes (81) are arranged on the end cover (8) along the circumferential direction. The end cover (8) is detachably connected to the bearing inner cover (5) by bolts passing through the waist-shaped holes (81).

6. The assembly structure of a permanent magnet motor and a resolver according to claim 1, characterized in that: The side wall of the bearing inner cover (5) extends outward to form a sleeve (51), and the rotary stator (6) is interference-fitted with the inner ring of the sleeve (51).

7. The assembly structure of a permanent magnet motor and a resolver according to claim 6, characterized in that: The inner ring of the sleeve (51) is provided with a first step (52), and after the rotational transformer stator (6) and the sleeve (51) are interference-fitted, the rotational transformer stator (6) abuts against the first step (52).

8. The permanent magnet motor and resolver assembly structure according to claim 1, characterized in that: A second step (11) is provided on the motor shaft (1), and after the resolver rotor (7) and the motor shaft (1) are interference-fitted, the resolver rotor (7) abuts against the second step (11).

9. The permanent magnet motor and resolver assembly structure according to claim 1, characterized in that: A rotating oil seal (9) is provided between the bearing inner cover (5) and the motor shaft (1).

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