【Question】What is the influence of carrier frequency on inverter and motor?
【Answer】1. The influence of carrier frequency on the output current of the inverter
(1) The higher the operating frequency, the larger the duty cycle of the voltage wave, and the smaller the composition of the current higher harmonics, that is, the higher the carrier frequency, the better the smoothness of the current waveform;
(2) The higher the carrier frequency, the smaller the allowable output current of the inverter;
(3) The higher the carrier frequency, the smaller the capacitive reactance of the wiring capacitor (because Xc=1/2πfC), and the greater the leakage current caused by high-frequency pulses.
2. The influence of carrier frequency on the motor
The higher the carrier frequency, the smaller the vibration of the motor, the less noisy the operation, and the less heat generated by the motor. However, the higher the carrier frequency, the higher the frequency of the harmonic current, the more serious the skin effect of the motor stator, the greater the motor loss, and the smaller the output power
3. The influence of carrier frequency on other equipment
The higher the carrier frequency, the more serious the interference of high-frequency voltage to electronic equipment through electrostatic induction, electromagnetic induction, electromagnetic radiation, etc.
4. The influence of carrier frequency on the inverter itself
The higher the carrier frequency, the greater the loss of the inverter and the smaller the output power. If the ambient temperature is high, the dead zone of the two inverter tubes above and below the inverter bridge will become smaller during the alternating conduction process, which can lead to a short circuit of the bridge arm and damage the inverter in serious cases.
The above content is sorted out according to the problems encountered in the actual work, for reference, if there are any problems, please communicate and correct in time.
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