A permanent magnet synchronous motor for electrostatic hydraulic actuator

Abstract

The present invention provides a permanent magnet synchronous motor for an electrostatic-hydraulic actuator. By limiting the structure and installation of a motor housing, an iron core, a motor rotor, a motor back cover, and a resolver, and clearly stipulating the winding starting positions and winding directions of the motor windings and the resolver windings, after the resolver is installed on the motor according to the limiting structure, the resolver zero position is consistent, the resolver zero position calibration process is eliminated, and the problem of difficult resolver calibration in the permanent magnet synchronous motor for the electrostatic-hydraulic actuator is solved, production efficiency is effectively improved, and the hidden danger of loose connection of the resolver stator in the circumferential direction can be eliminated.

Description

Technical Field

[0001] The present invention belongs to the technical field of resolver zero position calibration of permanent magnet synchronous motors, and in particular relates to a permanent magnet synchronous motor for an electrostatic hydraulic actuator. Background Art

[0002] Existing permanent magnet synchronous motors for electrostatic hydraulic actuators all adopt a method of first installing the resolver on the motor and then performing resolver zero position calibration to ensure that the resolver zero position of the motor is consistent.

[0003] This process is rather cumbersome, and the resolver installation lacks circumferential limitations. Under the strict high and low temperature, vibration and other environments required in the aviation field, there is a hidden danger of causing circumferential offset of the resolver. In this case, the resolver cannot truly feedback the motor rotor position, which will cause motor control failure. Summary of the Invention

[0004] The present invention provides a permanent magnet synchronous motor for an electrostatic hydraulic actuator, which solves the problem that the existing motor must be calibrated for the zero position of the resolver.

[0005] The present invention provides a permanent magnet synchronous motor for an electrostatic hydraulic actuator, comprising: a motor housing 1, an iron core winding 2, a motor stator limit pin 3, a motor rotor 4, a resolver rotor limit pin 5, a resolver rotor 6, a resolver stator limit pin 7, a resolver stator 8, and a motor rear cover 9; wherein,

[0006] An iron core limiting groove 10 is formed on the inner circle of the motor housing 1, and the absolute value of the angular tolerance between the iron core limiting groove 10 and the center line of the motor housing 1 does not exceed a first value; a shell limiting groove 11 is formed on the outer circle of the iron core winding 2, and the lamination slot on the inner circle of the iron core winding 2 corresponding to the shell limiting groove 11 is the starting position for winding the iron core winding 2; the winding direction of the iron core winding 2 is the first direction; the motor stator limiting pin 3 is clamped between the iron core limiting groove 10 and the shell limiting groove 11;

[0007] The motor rotor 4 is provided with a resolver rotor limiting groove 13 at one end on which the resolver rotor 6 is sleeved. The absolute value of the angular tolerance between the resolver rotor limiting groove 13 and the magnetic steel installation center line of the magnet 12 on the motor rotor 4 does not exceed a second value. The resolver rotor 6 is provided with a motor rotor limiting groove 14. The absolute value of the angular tolerance between the motor rotor limiting groove 14 and the center line of the salient pole position of the resolver rotor 6 does not exceed a third value. The resolver rotor limiting pin 5 is clamped between the resolver rotor limiting groove 13 and the motor rotor limiting groove 14. The magnet 12 on the motor rotor 4 is installed according to the preset installation polarity.

[0008] A rear cover limiting groove 15 is provided on the outer circle of the resolver stator 8. The lamination slot located on the inner circle of the resolver stator 8 corresponding to the rear cover limiting groove 15 is the starting position for winding the resolver stator 8. The winding direction of the resolver stator 8 is the second direction. A resolver stator limiting groove 16 is provided on the motor rear cover 9. The absolute value of the angular tolerance between the resolver stator limiting groove 16 and the center line of the motor rear cover 9 does not exceed the fourth value. The resolver stator limiting pin 7 is clamped between the rear cover limiting groove 15 and the resolver stator limiting groove 16.

[0009] Optionally, the inner circumferential surface of the motor housing 1 and the outer circumferential surface of the core winding 2 are clearance-fitted.

[0010] Optionally, the first value is 10 points.

[0011] Optionally, the second value is 15 points.

[0012] Optionally, the third value is 20 points.

[0013] Optionally, the first direction is clockwise or counterclockwise.

[0014] Optionally, the second direction is clockwise or counterclockwise.

[0015] Optionally, the fourth value is 15 points.

[0016] The present invention provides a permanent magnet synchronous motor for an electrostatic-hydraulic actuator. By limiting the structure and installation of a motor housing, an iron core, a motor rotor, a motor back cover, and a resolver, and clearly stipulating the winding starting positions and winding directions of the motor windings and the resolver windings, after the resolver is installed on the motor according to the limiting structure, the resolver zero position is consistent, the resolver zero position calibration process is eliminated, and the problem of difficult resolver calibration in the permanent magnet synchronous motor for the electrostatic-hydraulic actuator is solved, production efficiency is effectively improved, and the hidden danger of loose connection of the resolver stator in the circumferential direction can be eliminated. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a structural diagram of a permanent magnet synchronous motor for an electrostatic hydraulic actuator provided by the present invention;

[0018] Figure 2 This is a schematic diagram of the installation of the motor stator limit pin provided by the present invention;

[0019] Figure 3 Schematic diagram of the installation of the resolver rotor limit pin provided by the present invention;

[0020] Figure 4 This is a schematic diagram of the installation of the resolver stator limit pin provided by the present invention;

[0021] Description of reference numerals:

[0022] 1-motor housing, 2-iron core winding, 3-motor stator limiting pin, 4-motor rotor, 5-resolver rotor limiting pin, 6-resolver rotor, 7-resolver stator limiting pin, 8-resolver stator, 9-motor back cover, 10-iron core limiting slot, 11-housing limiting slot, 12-magnet, 13-resolver rotor limiting slot, 14-motor rotor limiting slot, 15-reverse cover limiting slot, 16-resolver stator limiting slot. DETAILED DESCRIPTION

[0023] The structure of the permanent magnet synchronous motor for the electrostatic hydraulic actuator provided by the present invention is explained below with reference to the accompanying drawings.

[0024] Figure 1 This is a structural diagram of the permanent magnet synchronous motor for the electrostatic hydraulic actuator provided by the present invention, refer to Figure 1 The present invention provides a permanent magnet synchronous motor structure for an electrostatic hydraulic actuator, comprising: a motor housing 1, an iron core winding 2, a motor stator limit pin 3, a motor rotor 4, a resolver rotor limit pin 5, a resolver rotor 6, a resolver stator limit pin 7, a resolver stator 8, and a motor back cover 9.

[0025] The inner circular surface of the motor housing 1 is loosely matched with the outer circular surface of the core winding 2. The inner circle of the motor housing 1 is provided with a core limiting groove 10 with a clear angular relationship, and the outer circle of the core winding 2 is provided with a housing limiting groove 11 associated with the starting position and winding direction of the motor winding. The motor housing 1 and the core winding 2 are mechanically limited by the core limiting groove 10, the housing limiting groove 11, the motor stator limiting pin 3 and the loosely matched circular surfaces.

[0026] For example, the core limiting groove 10 and the shell limiting groove 11 can be selected to be rectangular or circular, and the width and depth are generally selected to be 1.5 to 5 mm.

[0027] The motor rotor 4 is equipped with a magnet 12 of specified polarity and a resolver rotor limiting slot 13 having a clear polarity angular relationship with the magnet 12; the resolver rotor 6 is provided with a motor rotor limiting slot 14 associated with the rotor polarity; the resolver rotor 6 is mounted on the motor rotor 4 via a resolver rotor limiting pin 5; the resolver rotor 6 and the motor rotor 4 are mechanically limited by the resolver rotor limiting slot 13, the motor rotor limiting slot 14, the resolver rotor limiting pin 5, and a circular surface with clearance fit, thereby achieving a fixed connection with the motor magnet in a relative angular relationship.

[0028] A resolver winding is wound on the resolver stator 8; a rear cover limit slot 15 is provided on the resolver stator 8, which is associated with the starting position and winding direction of the resolver winding; the outer circle of the resolver stator 8 is assembled on the inner circle of the motor rear cover 9; a resolver stator limit slot 16 is provided on the motor rear cover 9; the motor rear cover 9 and the resolver stator 8 are mechanically limited by the rear cover limit slot 15, the resolver stator limit slot 16, the resolver stator limit pin 7 and the circular surface with clearance fit.

[0029] The motor rear cover 9 is connected to the motor housing 1 by mechanical fastening.

[0030] The iron core winding 2 and the resolver stator 8 are fixedly connected in a relative angular relationship through the iron core limiting slot 10 and the motor stator limiting pin 3 on the motor housing 1 and the resolver stator limiting slot 16 and the resolver stator limiting pin 7 respectively.

[0031] The permanent magnet synchronous motor structure disclosed in the present invention enables all permanent magnet synchronous motors adopting this structure to achieve the purpose of eliminating the need to calibrate the zero positions of the resolvers of the two permanent magnet synchronous motors because the stators and rotors of the motor and the resolver have a fixed relative angular relationship.

[0032] In a specific embodiment, the processing of a permanent magnet synchronous motor for an electrostatic hydraulic actuator provided by the present invention includes:

[0033] 1. The permanent magnet synchronous motor housing used in electrostatic hydraulic actuators is typically made of aluminum alloy or titanium alloy. Core retaining grooves are machined into the inner diameter of the motor housing using electrical discharge machining (EDM). The core retaining grooves are machined using the centerline of the housing as a reference, with a tolerance of no more than ±10° (angle).

[0034] 2. After the core of the core winding is completed by lamination, the outer shell limit groove is machined on the outer circle of the core by wire cutting or milling. The machining process is based on the lamination slot edge, and the tolerance value does not exceed ±20 minutes (angle).

[0035] 3. When winding the motor core, use the outer shell limit slot of the core winding as a reference to determine the starting slot number of the winding, and clearly require the winding direction to be clockwise or counterclockwise.

[0036] It is understood that the inner circle lamination slot corresponding to the outer circle housing limit slot is the starting slot. It is understood that the winding method of the motor core of all permanent magnet synchronous motors using the processing method provided by the present invention is consistent.

[0037] 4. The motor rotor shaft is generally made of stainless steel and has a resolver rotor stop slot machined into it. During machining, ensure that the angular tolerance of the stop slot relative to the magnet installation center does not exceed ±15 degrees. During magnet assembly, the magnets must be installed according to the specified polarity, that is, the resolver rotor stop slot corresponds to the outer diameter of the rotor to ensure that the magnets are installed with the same polarity.

[0038] 5. The motor back cover is generally made of aluminum alloy or titanium alloy, and a resolver stator limit groove is processed on its inner circle. During processing, the center line of the back cover is used as the reference, and the angle tolerance of the limit groove does not exceed ±15 minutes (angle).

[0039] 6. After the stator core of the resolver is laminated, the rear cover limit slot is machined on the outer circle of the core by wire cutting or milling. The machining process is based on the lamination slot edge, and the tolerance value does not exceed ±20 minutes (angle).

[0040] 7. When winding the coil on the resolver core, the starting slot number of the winding must be determined based on the rear cover limit slot on the outer circle of the resolver stator. At the same time, the winding direction must be clearly required to be clockwise or counterclockwise.

[0041] It is understood that the inner circle lamination slot corresponding to the rear cover limit slot of the outer circle of the resolver stator is the starting slot. It is understood that the winding method of the resolver core of all permanent magnet synchronous motors using the processing method provided by the present invention is consistent.

[0042] Furthermore, the winding method of the resolver core may be consistent with or different from the winding method of the motor core.

[0043] 8. A motor rotor limit groove is machined on the resolver rotor. The machining process is based on the position of the resolver rotor salient poles, and the limit groove angle tolerance value does not exceed ±20 minutes (angle).

[0044] 9. Assemble the motor housing, core winding, and motor stator limit pins into the stator; assemble the magnet, motor rotor, resolver rotor, and resolver rotor limit pins into the rotor; assemble the motor back cover, resolver stator, and resolver stator limit pins into the back cover; install the rotor and back cover into the stator in sequence to complete the overall assembly of the permanent magnet synchronous motor.

Claims

1. A permanent magnet synchronous motor for an electrostatic hydraulic actuator, characterized in that: include: Motor housing (1), iron core winding (2), motor stator limiting pin (3), motor rotor (4), resolver rotor limiting pin (5), resolver rotor (6), resolver stator limiting pin (7), resolver stator (8), motor rear cover (9); wherein, An iron core limiting groove (10) is provided on the inner circle of the motor housing (1), and the absolute value of the angular tolerance between the iron core limiting groove (10) and the center line of the motor housing (1) does not exceed a first value; an outer shell limiting groove (11) is provided on the outer circle of the iron core winding (2), and the lamination groove on the inner circle of the iron core winding (2) corresponding to the outer shell limiting groove (11) is the starting position for winding the iron core winding (2); the winding direction of the iron core winding (2) is a first direction; and the motor stator limiting pin (3) is clamped between the iron core limiting groove (10) and the outer shell limiting groove (11); The motor rotor (4) is provided with a rotary rotor limiting groove (13) at one end thereof on which the rotary rotor (6) is sleeved, and the absolute value of the angular tolerance between the rotary rotor limiting groove (13) and the magnetic steel installation center line of the magnetic steel (12) on the motor rotor (4) does not exceed a second value; the rotary rotor (6) is provided with a motor rotor limiting groove (14), and the absolute value of the angular tolerance between the motor rotor limiting groove (14) and the center line of the salient pole position of the rotary rotor (6) does not exceed a third value; the rotary rotor limiting pin (5) is clamped between the rotary rotor limiting groove (13) and the motor rotor limiting groove (14); the magnetic steel (12) on the motor rotor (4) is installed according to a preset installation polarity; A rear cover limiting groove (15) is provided on the outer circle of the resolver stator (8), and the lamination groove located on the inner circle of the resolver stator (8) corresponding to the rear cover limiting groove (15) is the starting position of the winding of the resolver stator (8), and the winding direction of the resolver stator (8) is the second direction; a resolver stator limiting groove (16) is provided on the motor rear cover (9), and the absolute value of the angular tolerance between the resolver stator limiting groove (16) and the center line of the motor rear cover (9) does not exceed a fourth value; and the resolver stator limiting pin (7) is clamped between the rear cover limiting groove (15) and the resolver stator limiting groove (16).

2. The permanent magnet synchronous motor according to claim 1, characterized in that: The inner circular surface of the motor housing (1) and the outer circular surface of the iron core winding (2) are clearance-matched.

3. The permanent magnet synchronous motor according to claim 1, characterized in that: The first value is 10 points.

4. The permanent magnet synchronous motor according to claim 1, characterized in that: The second value is 15 points.

5. The permanent magnet synchronous motor according to claim 1, characterized in that: The third value is 20 points.

6. The permanent magnet synchronous motor according to claim 1, characterized in that: The first direction is clockwise or counterclockwise.

7. The permanent magnet synchronous motor according to claim 1, characterized in that: The second direction is clockwise or counterclockwise.

8. The permanent magnet synchronous motor according to claim 1, characterized in that: The fourth value is 15 points.

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