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Protection method for reducing alternating current motor insulation bearing burning

A technology of AC motors and insulated bearings, which is applied in the direction of casings/covers/supports, electrical components, electromechanical devices, etc., and can solve problems such as bearing burnout failures, so as to ensure the safety of motors and equipment, reduce failure rates, and reduce insulation The effect of the bearing being burned by the shaft voltage

Inactive Publication Date: 2013-11-13
唐德尧
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But the problem is that a large number of motors that use insulated bearings still have a large number of bearing burnout failures, which are equivalent to or even more serious than when non-insulated bearings are used.

Method used

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  • Protection method for reducing alternating current motor insulation bearing burning
  • Protection method for reducing alternating current motor insulation bearing burning
  • Protection method for reducing alternating current motor insulation bearing burning

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Experimental program
Comparison scheme
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Embodiment Construction

[0028] The theoretical basis of the above design is analyzed below.

[0029] The mechanism of insulating bearings to prevent shaft voltage and the shaft current formed from damaging the bearings is that the normal shaft voltage frequency is very low, and the capacitance between the inside of the insulating bearing and the bearing seat is only about 2000-3000pF, and its capacity for low-frequency shaft voltage The resistance is too large to cause a sufficiently large axial current. The voltage drop and power of the small axial current on the contact point resistance of the rolling element and the inner and outer rings are small, which is not enough to cause overheating damage to the contact point.

[0030] The process mechanism analysis of "roller burning caused by impurity short-circuit shaft voltage" is proposed as follows: With the long-term operation of the bearing, its cage or rolling working surface will inevitably wear and produce metal impurities, especially in the proce...

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Abstract

The invention discloses a protection method for reducing alternating current motor insulation bearing burning. An alternating current motor comprises a bearing seat, a bearing and a rotor. The bearing is installed on the bearing seat, and the bearing and the rotor are sleeved on a motor shaft. The method includes that an insulation protection structure is arranged between the bearing seat and the bearing and between the bearing seat and the rotor respectively. The method achieves a remarkable effect of reducing burning of the insulation bearing for supporting a motor shaft system and caused by shaft voltage, and has the functions of reducing alternating current motor bearing fault rate and ensuring motor and device safety in the fields of rail transit and the like.

Description

technical field [0001] The invention relates to the field of safety protection of electromechanical equipment, in particular to a protection method for reducing burning loss of insulating bearings of AC motors, which is suitable for the safety protection and technical transformation of AC motors, especially bearings of AC motors used in rail vehicles such as subways. Background technique [0002] Alternating current generation and alternating current drives are increasingly used in the field of modern electrical engineering. For example, the classic AC motor works with the sinusoidal AC of the industrial grid, the rotor excitation winding of the doubly-fed alternator is powered by PWM, and the stator in the frequency conversion AC motor is supplied with AC voltage by PWM. Whether it is the alternating magnetic field generated by the stator or the rotor, the shaft voltage is induced between the two ends of the shaft system of the motor. The shaft voltage forms a loop through ...

Claims

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Application Information

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IPC IPC(8): H02K11/02H02K5/16H02K11/00
Inventor 唐德尧张弸
Owner 唐德尧
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