High-speed motor stator punching sheet structure capable of reducing press-fitting internal stress and electromagnetic vibration

Abstract

The utility model relates to a high-speed motor stator punching sheet structure capable of reducing press-fitting internal stress and electromagnetic vibration, which comprises a high-permeability and low-loss cold-rolled silicon steel sheet, stress unloading grooves, positioning grooves and axial ventilation holes, the stress unloading grooves, the positioning grooves and the axial ventilation holes are arranged on the high-permeability and low-loss cold-rolled silicon steel sheet, and the stress unloading grooves are distributed in an outer diameter area with low flux density amplitude in the stator punching sheet and are close to the positioning grooves. And the axial ventilation hole and the axial ventilation hole jointly serve as a stator core cooling air path. According to the utility model, the purpose of reducing the loss of the stator core is achieved by reducing the internal stress caused by the high-speed motor stator punching sheet in the technical process, and a certain inhibition effect on electromagnetic vibration and temperature rise is also achieved.

Description

Technical Field

[0001] The utility model relates to a high-speed motor stator, in particular to a high-speed motor stator punching structure capable of reducing press-fit internal stress and electromagnetic vibration. Background Art

[0002] High-speed motors offer the advantages of small size, light weight, and high power density, and are widely used in steam turbine generator sets, compressors, and power tools. As motor speed increases, stator core loss becomes a major component of the motor's total loss. This loss consists of hysteresis loss, eddy current loss, and residual loss. The magnitude of these losses depends not only on the loss characteristics of the lamination material but also on the processing method, lamination, and welding process. High residual internal stresses, such as thermal and mechanical stresses, caused by the process can further deteriorate the lamination's loss characteristics, significantly increasing the loss value at the same magnetic field strength, adversely affecting stator heat dissipation and vibration noise. Summary of the Invention

[0003] The utility model proposes a high-speed motor stator punching structure which reduces press-fit internal stress and electromagnetic vibration, and achieves the purpose of reducing stator core loss by reducing the residual internal stress level caused by stator core stacking and welding.

[0004] To achieve the above-mentioned purpose, the technical solution of the present invention is: a high-speed motor stator punching structure that reduces press-fit internal stress and electromagnetic vibration, which is composed of high-magnetic permeability, low-loss cold-rolled silicon steel sheets and stress unloading grooves, positioning grooves and axial ventilation holes opened thereon. The stress unloading grooves are distributed in the outer diameter area of the stator punching where the magnetic flux density amplitude is low, and are close to the positioning grooves, and together with the axial ventilation holes serve as a cooling air path for the stator core.

[0005] Furthermore, the stress unloading groove is an elongated waist-shaped hole structure, which weakens the internal stress and serves as a stator axial ventilation hole, and together with other circular ventilation holes, forms a stator axial ventilation structure.

[0006] Furthermore, the positioning groove is cooperated with the axial fixing rib to be welded and fixed when the iron core is press-fitted.

[0007] The beneficial effects of the present invention are: by reducing the internal stress of the stator core of the high-speed motor, the additional core loss caused by the process is suppressed, and at the same time, the electromagnetic vibration of the stator core is also suppressed to a certain extent, and no complicated processing process is required, so it has high reliability and economy. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 This is a schematic diagram of the structure of a high-speed motor stator punching sheet for reducing press-fit internal stress and electromagnetic vibration according to the utility model. DETAILED DESCRIPTION

[0009] To facilitate understanding of the present application, the present application will be described more fully below with reference to the accompanying drawings. The accompanying drawings illustrate preferred embodiments of the present application. However, the present application may be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and comprehensive understanding of the disclosure of the present application.

[0010] like Figure 1 As shown, the embodiment of the present invention provides a high-speed motor stator punching structure that reduces press-fit internal stress and electromagnetic vibration. The structure is composed of a high-magnetic permeability, low-loss cold-rolled silicon steel sheet and a positioning groove 1, a stress unloading groove 2 and an axial ventilation hole 3 opened thereon. The positioning groove 1 is welded and fixed in conjunction with the axial fixing rib when the core is press-fitted. During press-fit welding, the stator punching generates strain and stress, increasing the iron loss value. The stress unloading groove 2 is distributed in the outer diameter area of the stator punching where the magnetic flux density amplitude is low, and is close to the positioning groove 1. Under the premise of not affecting the magnetic circuit of the stator core, the strain and stress caused by the core stacking and the reinforcement rib welding process are absorbed through the deformation of the stress unloading groove, reducing the internal stress in the high magnetic flux density area such as the punching tooth part, thereby weakening the additional core loss caused by the internal stress, and also having a certain inhibitory effect on electromagnetic vibration and temperature rise.

[0011] Stress relief slots 2 are located in the outer diameter region of the stator laminations, where the magnetic flux density is low, and are located near the positioning slots. They relieve internal stress caused by lamination and rib welding. Together with the axial ventilation holes, they serve as a cooling air path for the stator core.

[0012] The stress unloading groove 2 usually adopts an elongated waist-shaped hole structure, which can weaken the internal stress and serve as a stator axial ventilation hole. Together with the circular axial ventilation hole 3, it constitutes a stator axial ventilation structure.

Claims

1. A high-speed motor stator lamination structure for reducing press-fit internal stress and electromagnetic vibration, characterized by: It consists of high-permeability, low-loss cold-rolled silicon steel sheets and stress unloading grooves, positioning grooves and axial ventilation holes opened on them. The stress unloading grooves are distributed in the outer diameter area of the stator punching sheet with low magnetic density amplitude and are close to the positioning grooves. Together with the axial ventilation holes, they serve as the cooling air path for the stator core.

2. The high-speed motor stator punching structure for reducing press-fit internal stress and electromagnetic vibration according to claim 1 is characterized in that: The stress unloading groove is an elongated waist-shaped hole structure, which weakens the internal stress and serves as a stator axial ventilation hole, and together with other circular ventilation holes forms a stator axial ventilation structure.

3. The high-speed motor stator punching structure for reducing press-fit internal stress and electromagnetic vibration according to claim 1, characterized in that: The positioning groove is matched with the axial fixing rib to be welded and fixed when the iron core is pressed.

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