Insulating paint for variable frequency motor and preparation method thereof

Abstract

The invention relates to an insulating paint for a variable frequency motor and a preparation method thereof. The insulating paint comprises the main components: unsaturated polyester resin, epoxy resin, cross-linking monomer, initiator, acid anhydride curing agent, polymerization inhibitor and filler. The preparation method comprises the steps of: preparing materials according to the components in part by weight, mixing base materials uniformly for later use, treating the filler and mixing and treating the base materials and the filler. The invention has the advantages that: the insulating paint is suitable for the variable frequency motor, in particular a high-power variable frequency motor; an insulating paint film has excellent mechanical property, good compatibility with electromagnetic wires, long pulse-resistant time, high electrical strength, low dielectric loss, good chemical stability resistance and high heat conductivity; and the preparation method for the insulating paint can ensure the quality of the produced insulating paint for the variable frequency motor.

Description

Technical field [0001] The invention relates to an insulating paint for a frequency conversion motor and a preparation method thereof, and belongs to the technical field of paint and motor manufacturing. Background technique [0002] Insulation is the heart of the motor, and its performance directly affects the operating life and reliability of the motor. The early damage of the inverter motor insulation is the result of multiple factors such as partial discharge, space charge, dielectric loss heating, electromagnetic excitation and vibration. [0003] The thermal breakdown of insulation caused by dielectric loss is one of the general concerns of motor insulation. In the insulation of variable frequency motors, the high frequency components of the voltage reach megahertz. The degree of insulation heating caused by the turning polarization of the dipole greatly exceeds that of the power frequency motor. The inverter-powered motor current deviates from the sinusoidal waveform, so ...

AI Technical Summary

Problems solved by technology

[0004] As we all know, most insulating materials are heat-insulating, and their thermal conductivity is generally around 0.2w / m·k, which makes the insulating materials insulate while hindering the heat loss of the motor due to high-speed rotation and electric shock to a certain extent. The accumulation of heat will accelerate the aging speed of the insulation, thereby shortening the life of the motor

[0005] If there is an air gap in the insulation structure of the variable frequency motor, under the action of high-frequency pulse voltage, the air gap will generate space charges, resulting in an increase in the number of partial discharges, which will eventually lead to insulation damage