A rotor press-fit structure for a motor

Abstract

The present invention discloses a rotor press-fitting structure of a motor, comprising a rotor support, a rotor magnetic pole, a front pressure ring and a rear pressure ring, a positioning groove matched with a positioning key at the bottom of the magnetic pole is provided on the rotor support, a magnetic pole module is provided on the surface of the rotor support, a bolt through hole is provided at the bottom and the corresponding position of the rotor support, a square through hole is provided at the bottom of the front side and the rear side of the magnetic pole module, a magnetic pole square screw is inserted therein, a connecting through hole is provided at the position corresponding to the bolt through hole on the magnetic pole square screw, and both ends of the magnetic pole square screw are threaded structures, and the threaded structure passes through the square through hole; the rotor magnetic pole is arranged on the magnetic pole module, the magnetic pole module, the magnetic pole square screw and the rotor magnetic pole are connected and fixed with the rotor support by bolts passing through the inner side of the rotor support, the front pressure ring and the rear pressure ring are respectively abutted against the front side and the rear side of the magnetic pole module by the threaded structure, and are fixed by bolts to axially compress the rotor magnetic pole. The present invention can improve the reliability and efficiency of motor assembly.

Description

Technical Field

[0001] The invention relates to a rotor press-fitting structure used in the field of motor assembly. Background Art

[0002] Based on the consideration of power generation efficiency and power generation cost, the speed of semi-direct drive wind turbines is getting higher and higher. The speed of existing models is generally low. Its traditional core press-fit structure has low tightness and positioning accuracy of magnetic pole press-fitting, and the hole position is deviated, resulting in inaccurate magnetic steel position. When balancing, it is necessary to add balancing blocks to ensure dynamic balance. Although adding balancing blocks eliminates the moment of inertia, it invisibly increases the weight of the entire motor, increases the installation and maintenance costs, and reduces the overall operating reliability of the unit. On the other hand, the misalignment of the stator and rotor will increase the axial magnetic pull and affect the operating stability of the entire rotor.

[0003] The existing rotor core press-fit structure (CN109687611A) has no direct fastening measures for the pole pull rods, and requires additional drilling and axial pressing, which increases the working hours and has a certain impact on reliability under high speed conditions. Summary of the invention

[0004] The purpose of the present invention is to overcome the deficiencies of the prior art and to provide a motor rotor press-fit structure that can improve the reliability and efficiency of motor assembly.

[0005] A technical solution to achieve the above object is: a rotor press-fit structure of a motor, comprising a rotor bracket, a rotor pole, a front pressure ring and a rear pressure ring;

[0006] A positioning groove is provided on the rotor bracket, and the positioning groove cooperates with the positioning key at the bottom of the magnetic pole. A magnetic pole module is provided on the surface of the rotor bracket. A plurality of rows of bolt through holes arranged along the axial direction are provided at the bottom of the magnetic pole module and the corresponding position of the rotor bracket. The position of the positioning groove is staggered with the position of the bolt through holes. A square through hole is provided at the position corresponding to each row of bolt through holes at the bottom of the front side and the rear side of the magnetic pole module, and a magnetic pole square screw is inserted therein. The screw body of the magnetic pole square screw is square, and a connecting through hole is provided on the screw body at the position corresponding to the bolt through hole, and the two ends of the screw are threaded structures, and the threaded structure passes through the square through hole.

[0007] The rotor pole is arranged on the pole module, and the pole module, the pole square screw and the rotor pole are connected and fixed to the rotor bracket by bolts passing through the inner side of the rotor bracket. The front pressure ring and the rear pressure ring are respectively abutted against the front side and the rear side of the pole module through the threaded structure, and are fixed by bolts to tighten the rotor pole in the axial direction.

[0008] Furthermore, adjustment gaskets are provided between the front pressure ring, the rear pressure ring and the magnetic poles.

[0009] Furthermore, one of the front pressure ring and the rear pressure ring is a split-petal pressure ring.

[0010] Furthermore, the position of the magnetic pole module can be shifted according to the supporting points of the rotor support.

[0011] Furthermore, the magnetic pole module is connected and fixed to the rotor bracket by welding instead of bolts.

[0012] The beneficial effects of the rotor press-fit structure of a motor of the present invention are:

[0013] 1. Each pole module takes corresponding measures to tighten or weld the pole to the bracket to ensure reliability under medium and high speed operating conditions.

[0014] 2. The pole screw is tightened by bolts at both ends of the pole screw, and there is no need to drill additional bolt holes at both ends of the pole to tighten and tighten, which increases reliability.

[0015] 3. The front and rear pressure rings only press the pole module and do not exert pressure on the rotor bracket, so that the tightness of the magnetic steel is guaranteed.

[0016] 4. The rotor bracket can be replaced at will according to the supporting conditions, which improves flexibility and applicability. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of a rotor press-fit structure of a motor of the present invention;

[0018] Figure 2 It is a structural schematic diagram of a magnetic pole square screw of a rotor press-fit structure of a motor of the present invention;

[0019] Figure 3 A schematic diagram of a support structure of a rotor bracket of a rotor press-fit structure of a motor of the present invention;

[0020] Figure 4 A schematic diagram of a support structure of a rotor bracket of a rotor press-fit structure of a motor of the present invention;

[0021] Figure 5 The present invention is a schematic diagram of a support structure of a rotor bracket of a motor rotor press-fit structure. DETAILED DESCRIPTION

[0022] In order to better understand the technical solution of the present invention, the following is a detailed description through specific embodiments:

[0023] See also Figure 1 The present invention discloses a rotor press-fit structure for a motor, comprising a rotor support 1, a rotor pole 2, a front pressure ring and a rear pressure ring.

[0024] The rotor support 1 is provided with a positioning groove 11, which cooperates with the positioning key at the bottom of the magnetic pole.

[0025] A magnetic pole module 3 is provided on the surface of the rotor support 1. A plurality of rows of bolt through holes 31 are provided at the bottom of the magnetic pole module 3 and at the corresponding position of the rotor support. The position of the positioning groove 11 is staggered with the position of the bolt through holes 31. Square through holes 32 are provided at the bottom of the front side and rear side of the magnetic pole module 3 corresponding to the positions of the rows of bolt through holes, and the magnetic pole square screws 4 are inserted therein. Figure 2 The screw body 41 of the magnetic pole square screw 4 is square, and a connecting through hole 42 is opened on the screw body 41 at a position corresponding to the bolt through hole, and the two ends of the screw body 41 are threaded structures 43, which pass through the square through hole 32 to connect the front pressure ring and the rear pressure ring.

[0026] See also Figures 3 to 5 When assembling the motor, the rotor pole 2 is set on the pole module 3, and the pole module 3, the pole square screw 4 and the rotor pole 2 are connected and fixed to the rotor bracket by bolts 5 passing through the inner side of the rotor bracket. The number of pole modules for each pole may be different according to design requirements. The rotor bracket can be designed as a single-arm support or a multi-arm support as needed, and the position of the pole module can be changed according to the setting position of the support point of the rotor bracket, and can be flexibly adjusted. It is also possible to directly choose to change the bolt fixation form to welding fixation, and weld the pole module 3 to the surface of the rotor bracket.

[0027] The front pressure ring and the rear pressure ring are respectively connected to the front side and the rear side of the magnetic pole module through the threaded structure and fixed by bolts to axially compress the rotor magnetic pole. Adjustment gaskets are provided between the front pressure ring and the rear pressure ring and the magnetic pole. One of the front pressure ring and the rear pressure ring is a split-petal pressure ring. The special design of the pressure ring only applies force to the rotor magnetic pole, and does not apply force to the rotor bracket.

[0028] Those skilled in the art should recognize that the above embodiments are only used to illustrate the present invention, and are not intended to limit the present invention. As long as they are within the spirit of the present invention, any changes or modifications to the above embodiments will fall within the scope of the claims of the present invention.

Claims

1. A rotor press-fit structure of a motor, comprising a rotor support, a rotor pole, a front pressure ring and a rear pressure ring, characterized in that: A positioning groove is provided on the rotor bracket, and the positioning groove cooperates with the positioning key at the bottom of the magnetic pole. A magnetic pole module is provided on the surface of the rotor bracket. A plurality of rows of bolt through holes arranged along the axial direction are provided at the bottom of the magnetic pole module and the corresponding position of the rotor bracket. The position of the positioning groove is staggered with the position of the bolt through holes. A square through hole is provided at the position corresponding to each row of bolt through holes at the bottom of the front side and the rear side of the magnetic pole module, and a magnetic pole square screw is inserted therein. The screw body of the magnetic pole square screw is square, and a connecting through hole is provided on the screw body at the position corresponding to the bolt through hole, and the two ends of the screw are threaded structures, and the threaded structure passes through the square through hole. The rotor pole is arranged on the pole module, and the pole module, the pole square screw and the rotor pole are connected and fixed to the rotor bracket by bolts passing through the inner side of the rotor bracket. The front pressure ring and the rear pressure ring are respectively abutted against the front side and the rear side of the pole module through the threaded structure, and are fixed by bolts to tighten the rotor pole in the axial direction.

2. The rotor press-fit structure of a motor according to claim 1, characterized in that: Adjustment gaskets are arranged between the front pressure ring, the rear pressure ring and the magnetic poles.

3. The rotor press-fit structure of a motor according to claim 1, characterized in that: One of the front pressure ring and the rear pressure ring is a split-flap pressure ring.

4. The rotor press-fit structure of a motor according to claim 1, characterized in that: The position of the magnetic pole module can be shifted according to the supporting points of the rotor support.

5. The rotor press-fit structure of a motor according to claim 1, characterized in that: The magnetic pole module is connected and fixed to the rotor bracket by welding instead of bolts.

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