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High-voltage high-power cage-type motor rotor copper bar harmonic elimination groove machining method

A technology of motor rotors and rotor copper strips, which is applied in the manufacture of squirrel cage rotors, motor generators, electrical components, etc., to achieve the effects of improving safety and reliability, reducing harmonic losses, and reducing reluctance

Active Publication Date: 2020-04-28
NORTH CHINA ELECTRIC POWER UNIV (BAODING) +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Aiming at how to solve the problem of how to reduce the probability of broken rotor bars in the use of high-voltage and high-power squirrel-cage asynchronous motors, so as to achieve efficient, safe and stable operation, there is currently no good solution. If these running motors are directly eliminated and replaced , will cause huge pressure on operating costs for the enterprise; therefore, how to implement appropriate remanufacturing processes for the running high-voltage and high-power motors to avoid such broken bars is an important problem that enterprises must face

Method used

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  • High-voltage high-power cage-type motor rotor copper bar harmonic elimination groove machining method
  • High-voltage high-power cage-type motor rotor copper bar harmonic elimination groove machining method
  • High-voltage high-power cage-type motor rotor copper bar harmonic elimination groove machining method

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Experimental program
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Effect test

Embodiment 1

[0028] Taking a 1600kW 8-pole squirrel-cage asynchronous motor as an example, according to the method provided by the patent of the present invention, the specific dimensions of the copper bar processing of the rotor are determined as follows: br1=10.5mm; hi1=1.5mm; hi2=2.6mm.

[0029] attached figure 2 It is a comparison chart of the current density waveform of the upper layer of a certain guide bar in the initial state of starting for a 1600kW 8-pole squirrel-cage asynchronous motor using the original rotor copper bar and the processed rotor copper bar proposed in the present invention. It can be seen that the starting rotor current density waveform of the original rotor copper strip motor has a large harmonic content within a working cycle, and the fundamental amplitude of the current density on the upper layer of a certain guide bar in the initial starting state is 1.83×10 8 A / m 2 . However, the starting rotor current density waveform of the rotor copper bar processed i...

Embodiment 2

[0040] Taking a 1600kW 12-pole squirrel-cage asynchronous motor as an example, according to the method provided by the patent of the present invention, the specific dimensions of the copper bar processing of the rotor are determined as follows: br1=8.5mm; hi1=1.5mm; hi2=2.6mm.

[0041] attached Figure 4It is a comparison chart of the current density waveform of the upper layer of a certain guide bar in the initial state of starting for a 1600kW 12-pole squirrel-cage asynchronous motor using the original rotor copper bar and the processed rotor copper bar proposed in the present invention. It can be seen that the maximum value of the current density on the upper layer of a guide bar in the initial state of starting with the original rotor copper bar is 2.513×10 8 A / m 2 , while the maximum value of the current density on the upper layer of a certain guide bar in the starting initial state of the rotor copper bar processed in this patent is 1.454×10 8 A / m 2 . After adopting ...

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Abstract

The invention belongs to the technical field of motor design and manufacturing and relates to a high-voltage high-power cage-type motor rotor copper bar harmonic elimination groove machining method. The machining method comprises the following steps that: positions on the upper surface of a rotor copper bar which are a certain distance away from a groove are vertically cut downwards; the middle ofthe rotor copper bar is further cut, so that a concave curved surface can be formed, and the original structure of a stator winding, a stator iron core and a rotor iron core are kept unchanged. According to the remanufacturing method, the convenience and economy of on-site transformation of a motor in use are fully considered; normal production is ensured to the maximum extent; the additional loss of the conducting bar caused by high-frequency harmonics in the steady-state operation of the original motor can be effectively reduced; the phenomena of high loss and high temperature rise of rotornotches caused by continuous large current in a starting process can be reduced; the operation efficiency of the motor can be effectively improved, the local temperature rise of the rotor notches ofthe motor is improved, and the fracture of the conducting bar due to over-high local temperature rise can be avoided.

Description

technical field [0001] The invention belongs to the technical field of motor design and manufacture, and in particular relates to a method for processing a harmonic elimination groove of a copper bar of a high-voltage and high-power cage-type motor rotor. Background technique [0002] In actual use, frequent failures of high-voltage and high-power motors will pose a serious threat to the safe operation of the entire production system. In the faults of high-voltage and high-power squirrel-cage asynchronous motors, the rotor notch area is partially overheated due to the loss generated by high-frequency harmonic current, which makes the guide bar rotor notch melt or even break, which is more common in engineering practice. of a malfunction. Aiming at how to solve the problem of how to reduce the probability of broken rotor bars in the use of high-voltage and high-power squirrel-cage asynchronous motors, so as to achieve efficient, safe and stable operation, there is currently ...

Claims

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Application Information

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IPC IPC(8): H02K15/00
CPCH02K15/0012
Inventor 赵海森郭星岚任博文戴鑫陈龙康锦萍杨亚秋刘晓芳
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)