Preparation method of electromagnetic wire for variable-frequency traction motor and product

Abstract

The invention discloses a preparation method of an electromagnetic wire for a variable-frequency traction motor. The preparation method is characterized by comprising the following steps: 1, carrying out finish rolling processing on an oxygen-free copper rod to form a copper conductor with a rectangular cross section; 2, forming a corona-resistant polyimide film layer on the surface of the copper conductor to wrap the copper conductor; 3, coating the corona-resistant polyimide film layer with a polyether-ether-ketone resin layer; and 4, after cooling and blow-drying, carrying out taking up. According to the invention, the polyetheretherketone resin is uniformly coated on the surface of the corona-resistant polyimide film layer by utilizing the characteristics of good high-temperature fluidity and high thermal decomposition temperature of the polyetheretherketone resin to form a self-lubricating protective layer, so that the corona-resistant polyimide film layer is prevented from being directly extruded and worn in the coil forming process, the anti-extrusion and anti-friction performance of the electromagnetic wire insulation layer is improved, the insulation service life of the electromagnetic wire insulation layer is prolonged, the insulation reliability of the electromagnetic wire is enhanced, and then the turn-to-turn insulation reliability of the motor stator coil is improved. The invention further provides the electromagnetic wire for the variable-frequency traction motor.

Description

technical field [0001] The invention relates to a preparation method and product of an electromagnetic wire for a variable-frequency traction motor, and belongs to the technical field of electromagnetic wire insulation. Background technique [0002] Variable frequency motors are widely driven by PWM modulation, and their output waveforms are square waves of different pulses. The voltage is modulated so that the current waveform passing through the motor windings is close to a sinusoidal current. Its carrier frequency ranges from hundreds of Hz to several thousand Hz and can reach up to 20kHz. The turn-to-turn insulation of variable frequency motors must constantly withstand the impact of high-frequency square-wave voltages with different pulse widths. Due to the frequent start-up of the variable frequency motor, the voltage or current passing through the frequency converter contains high-order harmonics, and the shock voltage wave head generated is very steep. The damage o...

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Problems solved by technology

However, the addition of fillers will also affect the mechanical properties of the film, which may easily cause extrusion damage to the insulating layer of the corona-resistant polyimide film sintering line during the coil forming process.

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