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

Abstract

The invention is used in AC-powered variable-frequency rare earth permanent magnet synchronous motor with low speed and high torque and frequently started and arrested. It comprises: main insulation, phase insulation, coil end insulation, insulating bush insulation, electromagnetic line insulation, leading-out line insulation, slot wedge, outgoing line board, and impregnating varnish. The main insulation comprises: slot insulation, overhang packing insulation, in-slot inter-layer insulation; the overhang packing, in-slot inter-layer insulation and phase insulation is made out of Mylar Polyaramide fiber paper; the electromagnetic line of stator coil is made out of anti-corona enameled copper wire; dip treating is made for the stator iron core with winding; impregnating varnish uses solvent-free immersion paint made out of polyester resin and unsaturated resin; a vacuum impregnation is used.

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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