Insulating system with double-strength, zero-air-gap and corona resistance for electric motor of non-gear permanent-magnetic tractor

Abstract

The invention relates to a gearless, low-speed, high-torque rare earth permanent magnet synchronous traction motor with double strength, zero air gap, and a corona-resistant insulation system. The corona-resistant insulation system and its insulation method are suitable for rare-earth permanent-magnet synchronous motors with low speed and high torque, which are used for AC variable frequency power supply and frequent starting and braking. The insulation system includes magnet wire, main insulation, phase insulation, coil end insulation, insulation sleeve insulation, magnet wire insulation, lead wire insulation, slot wedge, outlet plate, impregnated varnish. The main insulation includes slot insulation, end gasket insulation, and interlayer insulation in the slot; end gasket insulation, slot inner interlayer insulation, and phase insulation use polyester film polyaramid fiber paper, and the electromagnetic wire of the motor stator coil is made of resistant Corona enamelled copper wire; impregnated stator core with winding, the impregnating varnish adopts solvent-free impregnating varnish based on epoxy polyester resin and unsaturated resin, and adopts vacuum impregnation.

Description

technical field [0001] The invention relates to a gearless, low-speed, high-torque rare earth permanent magnet synchronous traction motor with double strength, zero air gap, and a corona-resistant insulation system. The corona-resistant insulation system and its insulation method are suitable for rare-earth permanent-magnet synchronous motors with low speed and high torque, which are used for AC variable frequency power supply and frequent starting and braking. Background technique: [0002] At present, the gearless permanent magnet traction machine motor insulation system only pays attention to the electric strength, ignoring the mechanical strength. The motor winding is full of air gaps, resulting in high-frequency pulse discharge and high-voltage discharge, which often cause the motor to burn out. Frequent starting and braking, electromagnetic excitation force and cyclic alternating pressure caused by vibration cause accelerated aging of the motor insulation, and the moto...

AI Technical Summary

Problems solved by technology

[0002] At present, the gearless permanent magnet traction machine motor insulation system only pays attention to the electric strength and ignores the mechanical strength. The motor winding is full of air gaps, resulting in high-frequency pulse discharge and high-voltage discharge, which often cause the motor to burn out

Frequent starting and braking, electromagnetic excitation force and cyclic alternating pressure caused by vibration cause accelerated aging of the motor insulation, and the motor noise is very loud within the operating frequency range, which affects the comfort of the elevator. In addition, control the connection between the variable frequency power supply and the motor terminal If the cable length is too long, it is easy to generate partial discharge, which shortens the service life of the motor

Many problems lead to a decline in the reliability of elevator traction motors

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