Question

Draw the harmonic current waveform and harmonic order for current drawn by an adjustable speed motor...

Draw the harmonic current waveform and harmonic order for current drawn by an adjustable speed motor drive.
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Answer #1

The speed of motor drive is controlled by the combination of rectifier and the inverter. The combination of the rectifier and the inverter is used to change the frequency of the AC signal. But some harmonic content is entered in the current flowing in motor drive. This harmonic content cause motor not to rotate smoothly which will damage the motor drive. For removing the harmonic content, there are capacitor and inductor is used in the circuit of the rectifier and the inverter.

The distortion of the current will be 30-40% compared to the 70-100% of a drive with no reactor.

Draw the current waveform for the 6-pulse inverter,

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