Asymmetrical Modes in Polyphase Motors and Drives

The effect of power supply and/or motor asymmetry on the phase-load distribution and the ripple of electromagnetic torque in a polyphase drive is studied by the method of symmetrical components. It is shown that the presence of asymmetry causes the mapping of all harmonics in the supply voltage into...

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Bibliographic Details
Published in:Russian electrical engineering 2021-07, Vol.92 (7), p.351-360
Main Authors: Tomasov, V. S., Usoltsev, A. A., Moravets, M., Shchepankovsky, P., Stsheletsky, R.
Format: Article
Language:English
Subjects:
Asymmetry
Dynamic models
Electromagnetic induction
Engineering
Harmonics
Induction motors
Load distribution (forces)
Machines
Manufacturing
Processes
Ripples
Skewed distributions
Squirrel cage motors
Torque
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Summary:The effect of power supply and/or motor asymmetry on the phase-load distribution and the ripple of electromagnetic torque in a polyphase drive is studied by the method of symmetrical components. It is shown that the presence of asymmetry causes the mapping of all harmonics in the supply voltage into all planes of symmetrical components and eliminates the possibility of independent control of harmonics. The dynamic model of a five-phase squirrel-cage induction motor demonstrates that even minor phase or amplitude asymmetry causes asymmetry in the phase load and ripple of the electromagnetic torque. Their level eliminates the possibility of continuous operation of the motor in this mode and requires the use of control systems that provide load balance in the intact phases.
ISSN:1068-3712
1934-8010
DOI:10.3103/S1068371221070105