Permanent magnet motor and zero setting method thereof

Abstract

A permanent magnet motor disclosed by the present invention comprises a casing, a stator, a rotor assembly, a rotary transformer and a rotating shaft, the rotor assembly comprises a mounting rack sleeving the rotating shaft and a rotor iron core mounted on the mounting rack, the rotary transformer comprises a rotary transformer support, a rotary transformer stator, a rotary transformer rotor and a coarse adjustment zeroing mechanism, the rotary transformer stator is arranged on the rotary transformer support, and the rotary transformer rotor is arranged on the rotary transformer support. The rotary transformer rotor is installed on the installation frame, and the coarse adjustment zero setting mechanism is used for adjusting a rotary transformer stator zero line to be parallel to a stator zero line, a rotor zero line and a salient pole zero line. The permanent magnet motor disclosed by the invention does not need to be externally connected with additional zeroing equipment for zeroing, the zeroing operation is simple, and the zeroing accuracy is high. The invention also discloses a zero setting method of the permanent magnet motor, the zero setting operation does not need tedious steps, the zero setting process is rapid and convenient, and the zero position accuracy after zero setting is high.

Description

Technical Field

[0001] The invention relates to the technical field of permanent magnet motors and rotary transformer zeroing methods, and in particular to a permanent magnet motor and a zeroing method thereof. Background Art

[0002] In recent years, with the rapid development of vehicle electrification, the requirements for the indicators of the drive motor on the vehicle are getting higher and higher. In order to monitor the rotor speed and position to transmit signals to the permanent magnet motor speed control system, a rotary transformer is often integrated inside the permanent magnet motor to accurately obtain the speed and position of the permanent magnet motor rotor. The highly integrated motor brings challenges to the zeroing of the permanent magnet motor rotary transformer. In the prior art, a separate dedicated zeroing mechanism is often used to rotate the rotor of the rotary transformer to find the zero position. When zeroing, the zeroing mechanism needs to be connected to the stator of the rotary transformer, which is complicated to operate and has low zeroing efficiency; and after the zeroing is completed, the stator of the rotary transformer needs to be fixed to the casing or end cover of the permanent magnet motor. During the fixing process, it is also easy to cause the stator of the rotary transformer to rotate, making the zero position inaccurate, affecting the precise speed regulation of the permanent magnet motor during normal use. For example, a flywheel integrated range extender motor rotary transformer electric angle zeroing device disclosed in the Chinese patent document with publication number CN219812057U. In addition, as the integration of permanent magnet motors becomes increasingly higher, components such as reducers need to be integrated at the front and rear ends of the permanent magnet motors, which brings challenges to the double-end installation and sealing of the permanent magnet motors. Summary of the invention

[0003] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a permanent magnet motor which is simple to operate during zero adjustment and has high zero position accuracy after zero adjustment.

[0004] The present invention further provides a zeroing method based on the permanent magnet motor.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0006] A permanent magnet motor comprises a casing, a stator, a rotor assembly, a rotary transformer and a rotating shaft, wherein a front end cover is provided at the front end of the casing, a rear end cover is provided at the rear end of the casing, the stator is arranged on the inner wall of the casing, two ends of the rotating shaft are respectively rotatably connected with the front end cover and the rear end cover, a first positioning assembly is provided between the stator and the casing, the first positioning assembly is used to ensure that the axis of the A-phase winding of the stator is parallel to the stator zero line, the rotor assembly comprises a mounting frame sleeved on the rotating shaft and a rotor core mounted on the mounting frame, a second positioning assembly is provided between the rotor core and the mounting frame, the second positioning assembly is used to ensure that the N-pole center axis of the rotor core is parallel to the rotor zero line, the rotary transformer comprises a rotary transformer bracket, a rotary transformer stator, a rotary transformer rotor and a coarse adjustment zeroing mechanism, the rotary transformer rotor is mounted on the mounting frame and parallel to the rotor core The core rotates coaxially, and a third positioning component is provided between the resolver rotor and the mounting frame, and the third positioning component is used to ensure that the salient pole zero line of the resolver rotor is parallel to the rotor zero line. The resolver stator is provided on the resolver bracket, and the coarse adjustment zero adjustment mechanism is used to drive the resolver bracket to swing and fix the resolver bracket with the rotating shaft as the central axis to adjust the resolver stator zero line of the resolver stator to be parallel to the stator zero line, the rotor zero line and the salient pole zero line. The coarse adjustment zero adjustment mechanism includes a zero line marking portion provided on the outer side of the front end cover, and the zero line marking portion is used to display the position of the resolver stator zero line. A zero adjustment mark parallel to the stator zero line, the rotor zero line and the salient pole zero line is provided on the outer side of the front end cover. When the zero line marking portion is aligned with the zero adjustment mark, the resolver stator zero line of the resolver stator is parallel to the stator zero line, the rotor zero line and the salient pole zero line.

[0007] As a further improvement of the above technical solution: the first positioning assembly includes a first positioning block and a first positioning groove for matching positioning, the first positioning block is arranged on the casing, the first positioning groove is arranged on the stator, the second positioning assembly includes a second positioning block and a second positioning groove for matching positioning, the third positioning assembly includes a third positioning block and a third positioning groove for matching positioning, the second positioning block is arranged on the rotor core, the third positioning block is arranged on the resolver rotor, the second positioning groove and the third positioning groove are both arranged on the mounting frame, and the central axes of the cross sections of the first positioning block, the second positioning groove and the third positioning groove coincide with the stator zero line, the rotor zero line and the salient pole zero line respectively.

[0008] As a further improvement of the above technical solution: the coarse adjustment and zeroing mechanism also includes a plurality of arc-shaped slots and a plurality of screws, the plurality of arc-shaped slots are all provided on the front end cover and are arranged at intervals along the circumference of the front end cover, the arc center of the arc-shaped slot is located on the rotation axis of the rotating shaft, one end of the plurality of screws passes through the corresponding arc-shaped slots and is threadedly connected to the resolver bracket, the zero line marking portion is provided at the other end, and the central axis of the zero line marking portion intersects vertically with the zero position line of the resolver stator.

[0009] As a further improvement of the above technical solution: the zero adjustment mark is a display line extending to the arc-shaped slot.

[0010] As a further improvement of the above technical solution: the resolver bracket is provided with a first wire outlet hole, and the front end cover is provided with a second wire outlet hole, and the first wire outlet hole and the second wire outlet hole are used to pass the lead wires of the resolver stator; the resolver bracket is provided with a baffle, and the baffle is located between the first wire outlet hole and the rotor core, or the inner side of the front end cover is provided with a clamp for fixing the lead wires of the resolver stator.

[0011] As a further improvement of the above technical solution: the front end cover and the rear end cover are respectively provided with bearing seats, and the rotating shaft is supported on the two bearing seats.

[0012] As a further improvement of the above technical solution: a rotational transformer sealing gasket is provided between the rotational transformer bracket and the front end cover.

[0013] As a further improvement of the above technical solution: the outer sides of the front end cover and the rear end cover are both provided with connecting structural members connected to the outside.

[0014] As a further improvement of the above technical solution: an oil hole is provided on the rotating shaft.

[0015] A method for zeroing a permanent magnet motor comprises the following steps:

[0016] S1: Manufacturing and assembly: Ensure that the A-phase winding axis of the stator is parallel to the stator zero line through the first positioning component, ensure that the N-pole center axis of the rotor core is parallel to the rotor zero line through the second positioning component, ensure that the salient pole zero line of the resolver rotor is parallel to the rotor zero line through the third positioning component, and align the rotor zero line with the stator zero line;

[0017] S2: Coarse adjustment: Loosen the screws and turn the screws to align the zero line mark with the zero adjustment mark;

[0018] S3: Fine adjustment: DC power is supplied to each phase winding of the stator, wherein the A phase winding is connected to the positive pole of the power supply, and the B phase winding and the C phase winding are connected to the negative pole of the power supply, so that the resolver stator rotates under electromagnetic induction, and its resolver stator zero position line is parallel to the salient pole zero position line;

[0019] S4: Fixing: Tighten the screws to fix the position of the resolver stator and complete zero adjustment.

[0020] Compared with the prior art, the advantages of this permanent magnet motor are:

[0021] (1) The resolver rotor is arranged on the resolver bracket. The resolver bracket can swing with the rotating shaft as the central axis through the coarse adjustment zero adjustment mechanism, so that after the motor is manufactured and assembled, the position of the resolver stator can be adjusted directly outside the motor through the coarse adjustment zero adjustment mechanism, without the need to connect a dedicated zero adjustment device to the resolver stator for zero adjustment. After the resolver stator is in place, the coarse adjustment zero adjustment mechanism can also fix the resolver bracket, which not only avoids the installation error caused by the resolver 4 being installed and fixed after zero adjustment, improves the accuracy of zero adjustment, but also facilitates operation outside the motor after installation, without the need to disassemble the motor again, and is convenient and quick to use.

[0022] (2) The first positioning assembly ensures that the axis of the stator's A-phase winding is parallel to the stator zero line, the second positioning assembly ensures that the N-pole centerline of the rotor core is parallel to the rotor zero line, and the third positioning assembly ensures that the salient pole zero line of the resolver rotor is parallel to the rotor zero line, providing a zeroing reference for the coarse adjustment of the coarse zeroing mechanism and the fine adjustment after power-on, thereby improving the coarse adjustment and fine adjustment efficiency and the overall zeroing accuracy.

[0023] (3) The coarse adjustment zeroing mechanism includes a zero line marking portion for displaying the resolver stator zero line, and a zeroing mark parallel to the stator zero line, the rotor zero line and the salient pole zero line is provided on the front cover. The resolver stator zero line can be adjusted to be roughly parallel to the stator zero line conveniently and quickly, which is beneficial for the resolver stator to be quickly put into place during the fine adjustment process, thereby reducing the zeroing time and improving the zeroing efficiency.

[0024] The advantages of the zeroing method of the permanent magnet motor are: when the motor is manufactured and assembled, the stator zero line, the rotor zero line and the salient pole zero line are ensured to be parallel, providing a zeroing reference for the coarse adjustment of the coarse adjustment zeroing mechanism and the fine adjustment after power-on, thereby improving the coarse adjustment and fine adjustment efficiency and the overall zeroing accuracy. During coarse adjustment, it is only necessary to loosen each screw and turn the screw until the zero line mark is aligned with the zeroing mark. During fine adjustment, it is only necessary to connect the A-phase winding of the stator to the positive pole of the power supply, and the B-phase winding and the C-phase winding to the negative pole of the power supply. The resolver stator will automatically rotate under electromagnetic induction until the resolver stator zero line is parallel to the salient pole zero line. The resolver stator has a short rotation stroke and a fast zeroing speed. The zeroing method of the permanent magnet motor does not require complicated steps for zeroing operation, the zeroing process is fast and convenient, and the zero position accuracy is high after zeroing. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic cross-sectional structure diagram of the first embodiment of the present invention.

[0026] Figure 2 It is a schematic cross-sectional structure diagram of the rotary transformer according to the first embodiment of the present invention.

[0027] Figure 3 yes Figure 1 Schematic diagram of the enlarged structure of part A.

[0028] Figure 4 It is a schematic diagram of the matching state of the resolver stator and the resolver rotor of the first embodiment of the present invention.

[0029] Figure 5 It is a schematic diagram of the installation status of the stator, rotor core, and resolver rotor of the first embodiment of the present invention.

[0030] Figure 6 It is a schematic structural diagram of the front end cover of the first embodiment of the present invention.

[0031] Figure 7 It is a schematic structural diagram of the rotational variable bracket according to the first embodiment of the present invention.

[0032] Figure 8 It is a schematic cross-sectional structure diagram of the second embodiment of the present invention.

[0033] Fig. 9 yes Figure 8 Schematic diagram of the enlarged structure of part B.

[0034] Fig.10 It is a schematic structural diagram of the rotational variable bracket of the second embodiment of the present invention.

[0035] Fig.11 This is a zero adjustment flow chart of the third embodiment of the present invention.

[0036] The reference numerals in the figure indicate: 1, housing; 10, bearing seat; 11, resolver seal; 12, connecting structure; 2, stator; 21, stator neutral line; 3, rotor assembly; 31, mounting frame; 32, rotor core; 321, rotor neutral line; 4, resolver; 41, resolver bracket; 411, first outlet hole; 412, baffle; 413, mounting boss; 414, oil seal; 42, resolver stator; 421, resolver stator zero line; 43, resolver rotor; 431, salient pole Zero line; 5. Rotating shaft; 51. Rotating axis; 6. Front cover; 61. Zero adjustment mark; 64. Chuck; 7. Rear cover; 81. First positioning assembly; 811. First positioning block; 812. First positioning slot; 82. Second positioning assembly; 821. Second positioning block; 822. Second positioning slot; 83. Third positioning assembly; 831. Third positioning block; 832. Third positioning slot; 9. Coarse zero adjustment mechanism; 90. Zero line marking portion; 91. Arc-shaped slot hole; 92. Screw. DETAILED DESCRIPTION

[0037] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0038] In the description of the present invention, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0039] In the present invention, unless otherwise clearly specified and limited, the terms "assemble", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0040] Embodiment 1

[0041] Figures 1 to 7An embodiment of the permanent magnet motor of the present invention is shown. The permanent magnet motor of this embodiment includes a casing 1, a stator 2, a rotor assembly 3, a rotary transformer 4 and a rotating shaft 5. The front end of the casing 1 is provided with a front cover 6, and the rear end of the casing 1 is provided with a rear cover 7. The stator 2 is arranged on the inner wall of the casing 1. The two ends of the rotating shaft 5 are rotatably connected to the front cover 6 and the rear cover 7 respectively. A first positioning assembly 81 is provided between the stator 2 and the casing 1. The first positioning assembly 81 is used to ensure that the A-phase winding axis of the stator 2 is parallel to the stator zero line 21. The rotor assembly 3 includes an installation sleeved on the rotating shaft 5. The mounting frame 31 and the rotor core 32 mounted on the mounting frame 31, a second positioning assembly 82 is provided between the rotor core 32 and the mounting frame 31, and the second positioning assembly 82 is used to ensure that the N pole center axis of the rotor core 32 is parallel to the rotor zero line 321, the rotary transformer 4 includes a rotary transformer bracket 41, a rotary transformer stator 42, a rotary transformer rotor 43 and a coarse adjustment zero adjustment mechanism 9, the rotary transformer rotor 43 is mounted on the mounting frame 31 and rotates coaxially with the rotor core 32, and a third positioning assembly 83 is provided between the rotary transformer rotor 43 and the mounting frame 31, and the third positioning assembly 83 is used to To ensure that the salient pole zero line 431 of the resolver rotor 43 is parallel to the rotor zero line 321, the first positioning assembly 81, the second positioning assembly 82 and the third positioning assembly 83 are used to ensure that the stator zero line 21 of the stator 2, the rotor zero line 321 of the rotor core 32 and the salient pole zero line 431 of the resolver rotor 43 are parallel, the resolver stator 42 is arranged on the resolver bracket 41, and the coarse adjustment zero adjustment mechanism 9 is used to drive the resolver bracket 41 to swing around the rotating shaft 5 as the central axis and fix the resolver bracket 41 to adjust the resolver stator zero line 421 of the resolver stator 42 to be parallel to the stator zero line 21. The zero line 21, the rotor zero line 321 and the salient pole zero line 431 are parallel, and the coarse zero adjustment mechanism 9 includes a zero line marking portion 90 provided on the outside of the front end cover 6, and the zero line marking portion 90 is used to display the position of the resolver stator zero line 421. The outside of the front end cover 6 is provided with a zero adjustment mark 61 parallel to the stator zero line 21, the rotor zero line 321 and the salient pole zero line 431. When the zero line marking portion 90 is aligned with the zero adjustment mark 61, the resolver stator zero line 421 of the resolver stator 42 is parallel to the stator zero line 21, the rotor zero line 321 and the salient pole zero line 431. It should be noted that the stator zero line 21, the rotor zero line 321 and the salient pole zero line 431 can be displayed as display lines on the stator 2, the rotor core 32 and the resolver rotor 43, respectively.

[0042] In the permanent magnet motor of this embodiment, on the first aspect, the resolver rotor 43 is arranged on the resolver bracket 41, and the resolver bracket 41 can swing with the rotating shaft 5 as the central axis through the coarse adjustment zero adjustment mechanism 9, so that after the motor is manufactured and assembled, the position of the resolver stator 42 can be adjusted directly outside the motor through the coarse adjustment zero adjustment mechanism 9, without the need to connect a dedicated zero adjustment device to the resolver stator 42 for zero adjustment. After the resolver stator 42 is in place, the coarse adjustment zero adjustment mechanism 9 can also fix the resolver bracket 41, which avoids the installation error caused by installing and fixing the resolver 4 after zeroing, improves the accuracy of zeroing, and is convenient for operation outside the motor after installation, without the need to disassemble the motor again, which is convenient and quick to use. On the second aspect, the first positioning assembly 81 ensures that the A-phase winding axis of the stator 2 is parallel to the stator zero line 21, the second positioning assembly 82 ensures that the N-pole center axis of the rotor core 32 is parallel to the rotor zero line 321, and the third positioning assembly 83 ensures that the salient pole zero line 431 of the resolver rotor 43 is parallel to the rotor zero line 321, providing a zeroing reference for the coarse adjustment and fine adjustment after power-on of the coarse adjustment zeroing mechanism 9, improving the coarse adjustment and fine adjustment efficiency and the overall zeroing accuracy. On the third aspect, the coarse adjustment zeroing mechanism 9 includes a zero line marking portion 90 for displaying the resolver stator zero line 421, and a zeroing mark 61 parallel to the stator zero line 21, the rotor zero line 321 and the salient pole zero line 431 is provided on the front end cover 6, so that the resolver stator zero line 421 can be adjusted to be roughly parallel to the stator zero line 21 conveniently and quickly, which is beneficial for the resolver stator 42 to be quickly in place during the fine adjustment process, reducing the zeroing time and improving the zeroing efficiency.

[0043] See Figures 2 to 5 Further, in the present embodiment, the first positioning assembly 81 includes a first positioning block 811 and a first positioning groove 812 for cooperation in positioning, the first positioning block 811 is arranged on the housing 1, the first positioning groove 812 is arranged on the stator 2, the second positioning assembly 82 includes a second positioning block 821 and a second positioning groove 822 for cooperation in positioning, the third positioning assembly 83 includes a third positioning block 831 and a third positioning groove 832 for cooperation in positioning, the second positioning block 821 is arranged on the rotor core 32, the third positioning block 831 is arranged on the resolver rotor 43, the second positioning groove 822 and the third positioning groove 832 are both arranged on the mounting frame 31, and the central axis of the cross section of the first positioning block 811, the second positioning groove 822 and the third positioning groove 832 coincide with the stator zero line 21, the rotor zero line 321 and the salient pole zero line 431 respectively. The structure is simple and the positioning is accurate, which is beneficial to ensure that the stator zero line 21, the rotor zero line 321 and the salient pole zero line 431 are parallel during the manufacturing and assembly process of the motor, and provides an accurate zero adjustment reference for coarse adjustment and fine adjustment.

[0044] See Figure 6Further, in this embodiment, the coarse zero adjustment mechanism 9 also includes a plurality of arc-shaped slots 91 and a plurality of screws 92. The plurality of arc-shaped slots 91 are all provided on the front end cover 6 and are arranged at intervals along the circumference of the front end cover 6. Preferably, the plurality of arc-shaped slots 91 are evenly arranged along the circumference of the front end cover 6, which is conducive to ensuring the stability of the resolver bracket 41 when it swings. The arc center of the arc-shaped slot 91 is located on the rotation axis 51 of the rotating shaft 5. One end of the plurality of screws 92 passes through the corresponding arc-shaped slot 91 and is threadedly connected with the resolver bracket 41. The zero line marking part 90 is provided at the other end, and the central axis of the zero line marking part 90 intersects perpendicularly with the resolver stator zero line 421. The arc-shaped slots 91 and the screws 92 have a simple structure, reliable use, easy processing, and low manufacturing cost. When the screws 92 are loosened to separate the screw heads from the front end cover 6, while the screws remain connected to the resolver bracket 41, the resolver bracket 41 can be driven to swing by moving the screws 92 in the arc-shaped slots 91, thereby driving the resolver stator 42 to rotate within a certain angle range. When the screws 92 are tightened to press the screw heads against the front end cover 6, the rotating bracket 41 is fixed to the front end cover 6. Of course, in other embodiments, the arc-shaped slots 91 can be replaced by circular slots, and all the screws 92 are located in the arc-shaped slots 91, so that the resolver stator 42 can be rotated at any angle along the circumferential direction.

[0045] See Figure 6 Furthermore, in this embodiment, the zero adjustment mark 61 is a display line extending to the arc-shaped slot 91. It is convenient for the zero line marking part 90 to quickly align with the zero adjustment mark 61, thereby improving the convenience during use.

[0046] Furthermore, in this embodiment, the rotor core 32, the resolver bracket 41 and the resolver rotor 43 are all located outside the mounting frame 31, the resolver bracket 41 is provided with a first outlet hole 411, and the front end cover 6 is provided with a second outlet hole (not shown in the figure), the first outlet hole 411 and the second outlet hole are used to pass the lead wire of the resolver stator 42; the resolver bracket 41 is provided with a baffle 412, the baffle 412 is located between the first outlet hole 411 and the rotor core 32, and the baffle 412 is helpful to prevent the lead wire of the resolver stator 42 from contacting with the rotor core 32 and being damaged. It should be noted that the outer side of the mounting frame 31 refers to the side close to the housing 1, and the inner side refers to the side away from the housing 1.

[0047] Furthermore, in this embodiment, the front cover 6 and the rear cover 7 are respectively provided with bearing seats 10, and the rotating shaft 5 is supported on the two bearing seats 10. This can prevent the rotating shaft 5 from having friction loss with the front cover 6 and the rear cover 7 during rotation, thereby increasing the service life of the rotating shaft.

[0048] Furthermore, in this embodiment, a rotary transformer sealing gasket 11 is provided between the rotary transformer bracket 41 and the front end cover 6 to prevent the lubricating oil from the outside from entering the inside of the housing 1.

[0049] Further, in this embodiment, the outer sides of the front cover 6 and the rear cover 7 are provided with a connecting structure 12 connected to the outside. Specifically, the connecting structure 12 is a stopper, which is convenient for installation and disassembly, and convenient for maintenance and replacement.

[0050] Furthermore, in this embodiment, the rotating shaft 5 is provided with an oil hole to facilitate the passage of lubricating oil and thus cool the rotor assembly 4 .

[0051] Embodiment 2

[0052] Figures 8 to 10 Another embodiment of the permanent magnet motor of the present invention is shown. The permanent magnet motor of this embodiment is substantially the same as the embodiment 1, except that: the rotor core 32 is located outside the mounting frame 31, the resolver bracket 41 and the resolver rotor 43 are both located inside the mounting frame 31, and no baffle 412 is provided between the rotor core 32 and the first lead hole 411. A clamp 64 for fixing the lead wire of the resolver stator 42 is provided inside the front end cover 6 to prevent the lead wire from contacting and being damaged by the rotor core 32. Compared with the embodiment 1, the resolver 4 occupies a smaller axial space inside the housing 1, and under the same boundary size, the effective length of the rotor core 32 is longer, and the power density when in use is greater.

[0053] See Fig.10 Furthermore, a mounting boss 413 for connecting with the screw 92 is provided on the outer side of the rotary bracket 41. This is helpful to ensure the connection strength between the screw 92 and the rotary bracket 41, and to prevent the screw 92 from being separated from the rotary bracket 41 during the process of loosening the screw 92, so that the use is more stable.

[0054] See Fig. 9 Furthermore, an oil seal 414 is provided between the rotary transformer bracket 41 and the mounting bracket 31, which improves the sealing performance and is more conducive to preventing the external lubricating oil from entering the interior of the housing 1.

[0055] Embodiment 3

[0056] Fig.11 An embodiment of a method for zeroing a permanent magnet motor of the present invention is shown. The method for zeroing a permanent magnet motor of this embodiment includes the following steps:

[0057] S1: Manufacturing and assembly: Ensure that the A-phase winding axis of the stator 2 is parallel to the stator zero line 21 through the first positioning component 81, ensure that the N-pole center axis of the rotor core 32 is parallel to the rotor zero line 321 through the second positioning component 82, ensure that the salient pole zero line 431 of the resolver rotor 43 is parallel to the rotor zero line 321 through the third positioning component 83, and align the rotor zero line 321 with the stator zero line 21;

[0058] S2: Coarse adjustment: Loosen the screws 92 and turn the screws 92 to align the zero line marking portion 90 with the zero adjustment mark 61;

[0059] S3: Fine adjustment: DC power is supplied to each phase winding of the stator 2, wherein the A phase winding is connected to the positive pole of the power supply, and the B phase winding and the C phase winding are connected to the negative pole of the power supply, so that the resolver stator 42 rotates under electromagnetic induction, and its resolver stator zero position line 421 is parallel to the salient pole zero position line 431;

[0060] S4: Fixing: Tighten the screws 92 to fix the position of the resolver stator 42 and complete zero adjustment.

[0061] The zeroing method of the permanent magnet motor of this embodiment ensures that the stator zero line 21, the rotor zero line 321 and the salient pole zero line 431 are parallel during the manufacture and assembly of the motor, providing a zeroing reference for the coarse adjustment of the coarse adjustment zeroing mechanism 9 and the fine adjustment after power-on, thereby improving the coarse adjustment and fine adjustment efficiency and the overall zeroing accuracy. During coarse adjustment, it is only necessary to loosen each screw 92, and move the screw 92 until the zero line marking part 90 is aligned with the zeroing mark 61. During fine adjustment, it is only necessary to connect the A-phase winding of the stator 2 to the positive pole of the power supply, and the B-phase winding and the C-phase winding to the negative pole of the power supply. The resolver stator 42 will automatically rotate under electromagnetic induction until the resolver stator zero line 421 is parallel to the salient pole zero line 431. The rotation stroke of the resolver stator 42 is short, and the zeroing speed is fast. The zeroing method of this permanent magnet motor does not require complicated steps for zeroing operation, the zeroing process is fast and convenient, and the zero position accuracy is high after zeroing.

[0062] Although the present invention has been disclosed as above with preferred embodiments, it is not intended to limit the present invention. Any technician familiar with the art can make many possible changes and modifications to the technical solution of the present invention by using the technical content disclosed above without departing from the scope of the technical solution of the present invention, or modify it into an equivalent embodiment of equivalent changes. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention should fall within the scope of protection of the technical solution of the present invention.

Claims

1. A permanent magnet motor, comprising a housing (1), a stator (2), a rotor assembly (3), a rotary transformer (4) and a rotating shaft (5), wherein the housing (1) is provided with a front end cover (6) at the front end, and a rear end cover (7) at the rear end of the housing (1), the stator (2) is arranged on the inner wall of the housing (1), and the two ends of the rotating shaft (5) are rotatably connected to the front end cover (6) and the rear end cover (7) respectively, and characterized in that: A first positioning assembly (81) is provided between the stator (2) and the housing (1), the first positioning assembly (81) being used to ensure that the axis of the A-phase winding of the stator (2) is parallel to the stator zero line (21), the rotor assembly (3) comprising a mounting frame (31) sleeved on the rotating shaft (5) and a rotor core (32) mounted on the mounting frame (31), a second positioning assembly (82) being provided between the rotor core (32) and the mounting frame (31), the second positioning assembly (82) being used to ensure that the rotor The N-pole center axis of the iron core (32) is parallel to the rotor zero line (321); the rotary transformer (4) comprises a rotary transformer bracket (41), a rotary transformer stator (42), a rotary transformer rotor (43) and a coarse zero adjustment mechanism (9); the rotary transformer rotor (43) is mounted on a mounting frame (31) and rotates coaxially with the rotor iron core (32); a third positioning component (83) is provided between the rotary transformer rotor (43) and the mounting frame (31); the third positioning component (83) is used to ensure that the salient pole zero line of the rotary transformer rotor (43) is aligned with the rotor zero line. (431) is parallel to the rotor zero line (321), the resolver stator (42) is arranged on the resolver bracket (41), the coarse adjustment zero adjustment mechanism (9) is used to drive the resolver bracket (41) to swing with the rotating shaft (5) as the central axis and fix the resolver bracket (41) to adjust the resolver stator zero line (421) of the resolver stator (42) to be parallel to the stator zero line (21), the rotor zero line (321) and the salient pole zero line (431), the coarse adjustment zero adjustment mechanism (9) includes a A zero line marking portion (90), the zero line marking portion (90) is used to display the position of the resolver stator zero line (421), and a zero adjustment mark (61) parallel to the stator zero line (21), the rotor zero line (321) and the salient pole zero line (431) is provided on the outer side of the front end cover (6), and when the zero line marking portion (90) is aligned with the zero adjustment mark (61), the resolver stator zero line (421) of the resolver stator (42) is parallel to the stator zero line (21), the rotor zero line (321) and the salient pole zero line (431).

2. The permanent magnet motor according to claim 1, characterized in that: The first positioning assembly (81) comprises a first positioning block (811) and a first positioning groove (812) for matching positioning; the first positioning block (811) is arranged on the housing (1); the first positioning groove (812) is arranged on the stator (2); the second positioning assembly (82) comprises a second positioning block (821) and a second positioning groove (822) for matching positioning; the third positioning assembly (83) comprises a third positioning block (831) and a third positioning groove (832) for matching positioning; 2), the second positioning block (821) is arranged on the rotor core (32), the third positioning block (831) is arranged on the resolver rotor (43), the second positioning groove (822) and the third positioning groove (832) are both arranged on the mounting frame (31), and the central axis of the cross section of the first positioning block (811), the second positioning groove (822) and the third positioning groove (832) respectively coincides with the stator zero line (21), the rotor zero line (321) and the salient pole zero line (431).

3. The permanent magnet motor according to claim 1, characterized in that: The coarse adjustment zeroing mechanism (9) further comprises a plurality of arc-shaped slot holes (91) and a plurality of screws (92); the plurality of arc-shaped slot holes (91) are all arranged on the front end cover (6) and are arranged at intervals along the circumference of the front end cover (6); the arc center of the arc-shaped slot holes (91) is located on the rotation axis (51) of the rotating shaft (5); one end of the plurality of screws (92) passes through the corresponding arc-shaped slot holes (91) and is threadedly connected to the resolver bracket (41); the zero line marking portion (90) is arranged at the other end; the center axis of the zero line marking portion (90) intersects perpendicularly with the resolver stator zero position line (421).

4. The permanent magnet motor according to claim 1, characterized in that: The zero adjustment mark (61) is a display line extending to the arc-shaped slot hole (91).

5. The permanent magnet motor according to any one of claims 1 to 4, characterized in that: The resolver bracket (41) is provided with a first wire outlet hole (411), and the front end cover (6) is provided with a second wire outlet hole, the first wire outlet hole (411) and the second wire outlet hole are used to pass the lead wire of the resolver stator (42); the resolver bracket (41) is provided with a baffle (412), the baffle (412) is located between the first wire outlet hole (411) and the rotor core (32), or the inner side of the front end cover (6) is provided with a clamp (64) for fixing the lead wire of the resolver stator (42).

6. The permanent magnet motor according to any one of claims 1 to 4, characterized in that: The front end cover (6) and the rear end cover (7) are respectively provided with bearing seats (10), and the rotating shaft (5) is supported on the two bearing seats (10).

7. The permanent magnet motor according to any one of claims 1 to 4, characterized in that: A rotary transformer sealing gasket (11) is provided between the rotary transformer bracket (41) and the front end cover (6).

8. The permanent magnet motor according to any one of claims 1 to 4, characterized in that: The outer sides of the front end cover (6) and the rear end cover (7) are both provided with connection structural members (12) connected to the outside.

9. The permanent magnet motor according to any one of claims 1 to 4, characterized in that: The rotating shaft (5) is provided with an oil hole.

10. A method for zeroing a permanent magnet motor, characterized in that: The steps include: S1: Manufacturing and assembly: using a first positioning component (81), ensure that the A-phase winding axis of the stator (2) is parallel to the stator zero line (21); using a second positioning component (82), ensure that the N-pole center axis of the rotor core (32) is parallel to the rotor zero line (321); using a third positioning component (83), ensure that the salient pole zero line (431) of the resolver rotor (43) is parallel to the rotor zero line (321); align the rotor zero line (321) with the stator zero line (21); S2: Coarse adjustment: loosen the screws (92), and turn the screws (92) to align the zero line mark (90) with the zero adjustment mark (61); S3: fine adjustment: direct current is supplied to each phase winding of the stator (2), wherein the A phase winding is connected to the positive pole of the power supply, and the B phase winding and the C phase winding are connected to the negative pole of the power supply, so that the resolver stator (42) rotates under electromagnetic induction, and its resolver stator zero position line (421) is parallel to the salient pole zero position line (431); S4: Fixing: Tighten the screws (92) to fix the position of the resolver stator (42) and complete the zero adjustment.

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