Stator and rotor installation and zero setting structure of motor rotary transformer

Abstract

The utility model relates to the technical field of motor rotary transformer installation, in particular to a motor rotary transformer stator and rotor installation and zero setting structure which comprises a motor rear cover, a motor shaft, a rotary transformer stator, a rotary transformer rotor and a rotary transformer support, the motor rear cover is provided with an opening groove, and the rotary transformer stator is fixedly installed in the rotary transformer support. The rotary transformer support is assembled in the open groove, the side wall of the end face of one end of the rotary transformer support extends outwards to form an edge part, a plurality of kidney-shaped holes are formed in the edge part, the peripheral end face of the open groove is provided with a plurality of threaded holes matched with the kidney-shaped holes and fixing bolts used for locking the rotary transformer support to the motor rear cover, and the rotary transformer rotor is fixedly installed on the motor shaft. According to the utility model, the rotary transformer stator is assembled by adding the rotary transformer support, zero setting can be carried out easily and quickly, the whole fixing bolt does not need to be loosened even if zero setting is carried out for multiple times, zero setting is simple and convenient, and production efficiency is high.

Description

Technical Field

[0001] The utility model relates to the technical field of motor rotary transformer installation, and more specifically to a motor rotary transformer stator and rotor installation and zero adjustment structure. Background Art

[0002] At present, pure electric vehicle drive motors mostly use resolvers to detect rotor position signals. The resolver is mainly composed of two parts: the stator and the rotor. The resolver stator is fixed on non-rotating parts such as the motor stator or end cover, and the resolver rotor is fixed on the motor rotor or shaft.

[0003] After the resolver is installed on the motor, its initial position needs to be fixed to ensure the initial angular position. The angular position accuracy requirements are relatively high, generally requiring the electrical angle to be within 1°. For a resolver with four pairs of poles, its mechanical angle is within 15'. However, since the initial position is affected by multiple factors such as the angular positioning of the motor stator and housing, the angular positioning of the rotor and shaft, the angular positioning of the housing and the back cover, the angular positioning of the resolver stator and the back cover, and the angular positioning of the resolver rotor and the rotor shaft, it is impossible to achieve such high accuracy requirements. Therefore, in actual operation, it is generally necessary to test and adjust the angular position of the resolver stator or rotor, and then fix the resolver stator or rotor to meet the requirements of the entire machine.

[0004] To address the above-mentioned issues, Chinese utility model patent publication number CN207782602U discloses a permanent magnet synchronous motor resolver stator and rotor fixing structure, comprising a motor rear cover having an open slot for accommodating a resolver stator, the stop of the open slot being in close clearance with the outer circumference of the resolver stator; a resolver pressure plate pressing against the end face of the resolver stator, the resolver pressure plate having fastening bolts for fastening the resolver stator to the motor rear cover; an elliptical slot in the open slot of the motor rear cover corresponding to the resolver signal line of the resolver stator; the length and width of the elliptical slot being greater than the length and width of the resolver signal line of the resolver stator; a stepped shaft at the front end having a threaded hole on the end face of the stepped shaft, and a bolt in the threaded hole; a resolver rotor mounted on the stepped shaft, a gasket pressed against the end face of the resolver rotor, and the bolts fastening the gasket and resolver rotor to the motor shaft.

[0005] Although this technical solution can achieve the fixation and zeroing of the stator and rotor of the rotary transformer, it still has the following problems:

[0006] First, the entire stator of the rotary transformer in this technical solution is installed and sunk into the inner hole of the motor back cover. During zero adjustment, there is relatively large friction resistance between the silicon steel sheet surface of the rotary transformer stator and the motor back cover, making it impossible to quickly achieve high-precision zero adjustment.

[0007] Secondly, after zeroing is completed, the rotary transformer pressure plate is used to fix it. If a second zeroing is required, the locked rotary transformer pressure plate needs to be completely disassembled before zeroing again, which is very time-consuming and cumbersome, reducing production efficiency.

[0008] Third, the rotating transformer rotor is fixed with gaskets and bolts. As the motor rotates at high speed, the bolts are likely to loosen under the action of the rotating centrifugal force, making it impossible to fix the rotating transformer rotor, posing a risk of failure. Utility Model Content

[0009] The purpose of the utility model is to provide a motor rotary transformer stator and rotor installation and zero adjustment structure to solve the above-mentioned prior art problems.

[0010] The utility model adopts the following technical solutions:

[0011] A motor rotating transformer stator and rotor installation and zero adjustment structure includes a motor back cover and a motor shaft, the rotating transformer includes a rotating transformer stator and a rotating transformer rotor, the motor back cover is provided with an open slot, and also includes a rotating transformer bracket, the rotating transformer stator is fixedly installed in the rotating transformer bracket, the rotating transformer bracket is assembled in the open slot, one end face side wall of the rotating transformer bracket extends outward with an edge portion, the edge portion conflicts with the peripheral end face of the opening slot of the motor back cover, a plurality of waist-shaped holes are opened on the edge portion, the peripheral end face of the opening slot of the motor back cover is provided with a plurality of threaded holes matching the waist-shaped holes, and a fixing bolt for locking the rotating transformer bracket to the motor back cover, the fixing bolt passes through the waist-shaped hole and is locked in the threaded hole; the rotating transformer rotor is fixedly installed on the motor shaft.

[0012] Furthermore, the resolver bracket is a hollow cylinder, and the resolver stator is fixedly installed in the resolver bracket by an interference fit shrink sleeve.

[0013] Furthermore, there are four waist-shaped holes, which are arranged around the edge portion with the axis of the rotary transformer stator as the center; there are twelve threaded holes, which are arranged around the peripheral end surface of the opening slot of the motor back cover with the axis of the rotary transformer stator as the center.

[0014] Furthermore, the resolver rotor is fixedly mounted on the motor shaft via a flat key and a shaft retaining ring.

[0015] Preferably, the motor shaft is provided with a keyway cooperating with the flat key, and a retaining ring groove cooperating with the shaft retaining ring.

[0016] Furthermore, the resolver stator is provided with a resolver signal line, and the motor rear cover is provided with a wire groove for the resolver signal line to pass through.

[0017] From the above description of the structure of the utility model, it can be seen that compared with the prior art, the utility model has the following advantages:

[0018] 1. The resolver stator of this utility model is mounted in the open slot of the motor rear cover via a resolver bracket. The outer ring sidewall of the resolver bracket can be machined, resulting in low friction resistance. This allows for quick and easy zero adjustment in conjunction with the motor rear cover. During zero adjustment, if the initial adjustment fails to meet the required accuracy and a secondary zero adjustment is required, simply loosen the bolts securing the resolver bracket to the motor rear cover slightly, fine-tune the position, and then re-tighten the bolts. Completely loosening the entire set of bolts is unnecessary, saving time, allowing for quicker adjustments and improving production efficiency.

[0019] 2. The utility model adopts twelve threaded holes, four waist-shaped holes and four fixing bolts for zero adjustment, which can ensure that the motor can be adjusted to zero position under any circumstances, and the zero adjustment accuracy is high.

[0020] 3. The resolver rotor of the utility model is fixedly mounted on the motor shaft by a flat key and a shaft retaining ring. The flat key is used to limit the circumferential rotation direction of the resolver rotor, and the shaft retaining ring is used to fix the axial direction of the resolver rotor. This structure can achieve safe and reliable fixation of the resolver rotor, preventing the resolver rotor from loosening and failing under high-speed rotation. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic structural diagram of the utility model.

[0022] Figure 2 for Figure 1 Schematic diagram of the decomposition.

[0023] Figure 3 for Figure 1 Right view of .

[0024] Among them, the numbers in the figure are: motor back cover 10, opening groove 11, threaded hole 12, wire groove 13, motor shaft 20, keyway 21, retaining ring groove 22, resolver stator 30, resolver signal line 31, resolver rotor 40, resolver bracket 50, edge portion 51, waist-shaped hole 52, fixing bolt 53, flat key 60, shaft retaining ring 70. DETAILED DESCRIPTION

[0025] The specific implementation of the embodiment of the present utility model is described below with reference to the accompanying drawings.

[0026] Reference Figure 1 and Figure 2 A motor rotary transformer stator and rotor installation and zeroing structure includes a motor back cover 10 and a motor shaft 20. The rotary transformer includes a rotary stator 30 and a rotary rotor 40, and also includes a rotary bracket 50, a flat key 60 and a shaft retaining ring 70.

[0027] Reference Figure 2 and Figure 3 The resolver bracket 50 is a hollow metal cylinder. The resolver stator 30 is fixedly mounted within the resolver bracket 50 via an interference fit, forming the resolver stator assembly. A rim 51 extends outward from the sidewall of one end of the resolver bracket 50. This rim 51 is defined by a plurality of waist-shaped holes 52. In this embodiment, there are four waist-shaped holes 52, centered around the axis of the resolver stator 30 and arranged around the rim 51.

[0028] Reference Figures 1 to 3 The motor back cover 10 is provided with an open slot 11, into which the resolver stator assembly is assembled. After assembly, the edge portion 51 abuts against the peripheral end surface of the open slot 11 of the motor back cover 10. The peripheral end surface of the open slot 11 of the motor back cover 10 is provided with a plurality of threaded holes 12 that mate with the waist-shaped holes 52. Twelve threaded holes 12 are arranged around the peripheral end surface of the open slot 11 of the motor back cover 10, centered around the axis of the resolver stator 30. Four fixing bolts 53 are also included for securing the resolver bracket 50 to the motor back cover 10. The fixing bolts 53 extend through the waist-shaped holes 52 and are locked into the threaded holes 12.

[0029] Reference Figures 1 to 3 The resolver rotor 40 is fixedly mounted on the motor shaft 20. Specifically, the motor shaft 20 is provided with a keyway 21 that mates with a flat key 60, and a retaining ring groove 22 that mates with a shaft retaining ring 70. In this embodiment, the resolver rotor 40 is fixedly mounted on the motor shaft 20 via the flat key 60 and the shaft retaining ring 70. The flat key 60 is used to limit the circumferential rotation direction of the resolver rotor, and the shaft retaining ring 70 is used to fix the resolver rotor in the axial direction. This structure ensures safe and reliable fixation of the resolver rotor 40, preventing the resolver rotor 40 from loosening and failing under high-speed rotation.

[0030] Reference Figure 1 and Figure 3 A resolver signal line 31 is provided on the resolver stator 30, and a wire groove 13 for the resolver signal line 31 to pass through is provided on the motor back cover 10. When the resolver stator 30 is assembled, the resolver signal line 31 can pass through the wire groove 13 and be constrained in the motor back cover 10, thereby making the circuit structure more compact and organized.

[0031] Reference Figures 1 to 3 When the present invention is used, the resolver stator 30 is installed in the opening slot 11 of the motor rear cover 10 through the resolver bracket 50. Since the outer ring side wall of the resolver bracket 50 can be machined such as polishing, the friction resistance is small, and it can be easily and quickly adjusted to zero in conjunction with the motor rear cover 10.

[0032] In addition, the utility model performs zero adjustment through the twelve threaded holes 12, the four waist-shaped holes 52 and the four fixing bolts 53, which can ensure that the motor can be adjusted to the zero position under any circumstances, and the zero adjustment accuracy is high; at the same time, after the initial angle adjustment, some accuracies cannot meet the requirements and a secondary zero adjustment is required. In this case, it is only necessary to slightly loosen the fixing bolts 53 between the rotary transformer bracket 50 and the motor back cover 10, and then re-tighten the fixing bolts 53 after fine-tuning into place. There is no need to completely loosen the entire fixing bolt 53, which can save labor time, quickly adjust into place, and improve production efficiency.

[0033] The above is only a specific implementation method of the present invention, but the design concept of the present invention is not limited to this. Any non-substantial changes to the present invention using this concept shall be deemed as an infringement of the protection scope of the present invention.

Claims

1. A motor rotary transformer stator and rotor installation and zeroing structure, comprising a motor rear cover and a motor shaft, wherein the rotary transformer comprises a rotary stator and a rotary rotor, and the motor rear cover is provided with an open slot, characterized in that: It also includes a resolver bracket, the resolver stator is fixedly installed in the resolver bracket, the resolver bracket is assembled in the open slot, the side wall of one end face of the resolver bracket extends outward with an edge portion, the edge portion conflicts with the peripheral end face of the open slot of the motor back cover, a plurality of waist-shaped holes are opened on the edge portion, the peripheral end face of the open slot of the motor back cover is provided with a plurality of threaded holes matching the waist-shaped holes, and a fixing bolt for locking the resolver bracket to the motor back cover, the fixing bolt passes through the waist-shaped hole and is locked in the threaded hole; the resolver rotor is fixedly installed on the motor shaft.

2. The stator and rotor installation and zero adjustment structure of a motor rotary transformer according to claim 1, characterized in that: The resolver bracket is a hollow cylinder, and the resolver stator is fixedly installed in the resolver bracket through an interference fit shrink sleeve.

3. The stator and rotor installation and zero adjustment structure of a motor rotary transformer according to claim 1, characterized in that: There are four waist-shaped holes, which are arranged around the edge portion with the axis of the rotary stator as the center; there are twelve threaded holes, which are arranged around the peripheral end surface of the opening slot of the motor back cover with the axis of the rotary stator as the center.

4. The stator and rotor installation and zero adjustment structure of a motor rotary transformer according to claim 1, characterized in that: The resolver rotor is fixedly mounted on the motor shaft via a flat key and a shaft retaining ring.

5. The stator and rotor installation and zero adjustment structure of a motor rotary transformer according to claim 4, characterized in that: The motor shaft is provided with a keyway matched with the flat key, and a retaining ring groove matched with the shaft retaining ring.

6. The stator and rotor installation and zero adjustment structure of a motor rotary transformer according to claim 1, characterized in that: The resolver stator is provided with a resolver signal line, and the motor rear cover is provided with a wire groove for the resolver signal line to pass through.

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