What effect does the carrier frequency have on the inverter and the motor?
The carrier frequency has an effect on the inverter output current:
(1) The higher the operating frequency, the larger the duty cycle of the voltage wave, and the smaller the current harmonic component, that is, the higher the carrier frequency, the better the smoothness of the current waveform;
(2) The higher the carrier frequency, the smaller the current allowed by the inverter;
(3) The higher the carrier frequency, the smaller the capacitive reactance of the wiring capacitor (because Xc = 1/2πfC), and the larger the leakage current caused by the high frequency pulse.
The effect of carrier frequency on the motor:
The higher the carrier frequency, the smaller the vibration of the motor, the smaller the running noise, and the less the motor generates heat. However, the higher the carrier frequency, the higher the frequency of the harmonic current, and the more severe the skin effect of the motor stator. The larger the motor loss, the smaller the output power.
15, why can't the inverter be used as a variable frequency power supply?
The whole circuit of the variable frequency power supply is composed of alternating current, alternating current, and filtering. Therefore, the output voltage and current waveforms are pure sine waves, which are very close to the ideal AC power supply. It can output grid voltage and frequency in any country in the world.
The inverter is composed of alternating current, alternating current (modulated wave) and other circuits. The standard of the inverter should be the inverter. The waveform of the output voltage is a pulse square wave, and the harmonic components are many. The voltage and the frequency are proportionally changed at the same time, and cannot be separately adjusted, and does not meet the requirements of the AC power source. In principle, the use of power supply cannot be used, and it is generally only used for the speed regulation of three-phase asynchronous motors.
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