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Induction motor rotor conducting strip and preparation method thereof

A rotor guide bar and induction motor technology, applied in the manufacture of stator/rotor body, magnetic circuit rotating parts, magnetic circuit shape/style/structure, etc., can solve the problems of increasing the complexity of deviation, the existence of gaps, and the assembly Increased difficulty and other issues, to achieve the effect of low cost, easy operation, and slow down the concentration of thermal stress

Pending Publication Date: 2021-03-16
HOZON NEW ENERGY AUTOMOBILE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The metal sheet can play an isolation role, but it is difficult to solve the gap caused by the manufacturing deviation of the groove shape. One more piece will increase the complexity of the deviation and greatly increase the difficulty of assembly.

Method used

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  • Induction motor rotor conducting strip and preparation method thereof
  • Induction motor rotor conducting strip and preparation method thereof
  • Induction motor rotor conducting strip and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0041] A method for preparing an induction motor rotor guide bar, comprising the following steps

[0042] S01 Design the cross-sectional shape of the guide bar so that part of the profile of the guide bar is the same as the nominal profile of the iron core slot 11, and there is a gap between part of the guide bar and the nominal profile of the iron core slot 11. The deformed deformation-response structure occurs.

[0043] S02 Design the bar preparation mold according to the cross-sectional shape of the bar.

[0044] S03 Extrude the bar material into the required bar through the bar preparation mold.

[0045] The motor rotor guide bar manufactured by the method of the present application can tolerate the manufacturing deviation of the groove shape of the rotor iron core groove 11, and can closely adhere to the groove shape in the entire manufacturing tolerance zone, preventing the guide bar from vibrating or even breaking when the rotor rotates at high speed. The method of th...

Embodiment 1

[0046] Embodiment 1, the S01 is specifically designed to design the cross-sectional shape of the guide bar so that the profile of the guide bar is the same as the nominal profile of the iron core slot 11, the radial end of the guide bar is provided with a first gap 31, and the other radial end is provided with a The second gap 32, and the guide bar is provided with clearance grooves on both sides in the circumferential direction. The profile of the inner and outer ends of the guide bar body 3 is consistent with the nominal profile of the iron core groove, and in the nominal profile state, the inner and outer ends of the guide bar are just close to the groove. When manufacturing deviation causes the actual profile of the groove to be smaller than the nominal profile, the inner and outer ends of the guide bar will be squeezed and deformed when the guide bar body 3 is driven in, and the gap will be narrowed, so that the guide bar will stick to the groove shape. The amount of defo...

Embodiment 2

[0047] In the second embodiment, the S01 is specifically designed to design the cross-sectional shape of the guide bar so that the guide bar is provided with several convex hulls 41 on its outer periphery and pits 42 are provided on both sides of each of the convex hulls 41, and the convex hulls The height of 41 is the same as the contour tolerance of the iron core slot 11. The contour formed by the highest point of the convex hull 41 is consistent with the nominal contour of the iron core groove, and in the state of the nominal contour, the guide bar is just in close contact with the groove. When the manufacturing deviation causes the actual profile of the groove to be smaller than the nominal profile, these small convex shells 41 will be squeezed and collapsed when the guide bar is driven in, and partially or completely fill the recesses 42 below. The amount of deformation of the bulge 41 depends on the manufacturing deviation of the groove shape, and the guide bar can be ti...

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Abstract

The invention relates to the technical field of rotor conducting strips, particularly to an induction motor rotor conducting strip and a preparation method thereof. According to the induction motor rotor conducting strip, part of the contour of the conducting strip is the same as the nominal contour of an iron core groove, a gap exists between part of the contour of the conducting strip and the nominal contour of the iron core groove, and a deformation coping structure allowing the conducting strip to deform when driven into the iron core groove is arranged. The preparation method of the induction motor rotor conducting strip comprises the following steps: S01, designing the section shape of a conducting strip, so that a part of the contour of the conducting strip is the same as the nominal contour of an iron core groove, a gap exists between the other part of the contour of the conducting bar and the nominal contour of the iron core groove, and a deformation coping structure allowingthe conducting bar to deform when the conducting bar is punched into the iron core groove is arranged; S02, designing a conducting strip preparation mold according to the section shape of the conducting strip; and S03, extruding and forming the conducting strip material into the required conducting strip through the conducting strip preparation mold. According to the invention, the conducting strip and the iron core groove are convenient to drive in and moderate in tightness; and the preparation method of the conducting strip is very simple and convenient to operate, low in cost and suitable for mass production of the conducting bar.

Description

technical field [0001] The invention relates to the technical field of rotor guide bars, in particular to an induction motor rotor guide bar and a preparation method thereof. Background technique [0002] Due to the obvious advantages of induction motors in terms of operational stability, reliability, maintainability, controllability, high power, and high-speed operation capabilities, many electric vehicles use induction motors as drive systems. Induction motors generally use cast copper rotors, which are relatively easy to manufacture by inserting guide bars (copper bars, aluminum bars, etc.) into the slots of the rotor core, and the manufacturing cost is relatively low. However, if the guide bar is loose in the slot, the rotor will be unbalanced, which will cause noise and vibration of the motor, and even lead to the continuous high-frequency vibration of the guide bar in the slot and fatigue fracture. If the nominal gap between the guide bar and the groove is too small, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02K1/28H02K15/02
CPCH02K1/28H02K15/02
Inventor 赵坤民张洪雷彭庆丰方运舟
Owner HOZON NEW ENERGY AUTOMOBILE CO LTD
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