Analysis of AC induction motor transients caused by PWM inverters

Technical Report · Thu Jun 01 04:00:00 EDT 1995

OSTI ID:376837

Bonnett, A H ^[1]

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1. Division of Emerson Electric Co., St. Louis, MO (United States)

The purpose of this paper is not to reveal any new technology or major break through pertaining to the impact of pulse-width modulated (PWM) adjustable speed drives operating on ac motors. Nor is it to discuss the merits of the various designs of the drives. The applications are also well defined. The area where much confusion still exists deals with the voltage waveform impact on the motor performance, hence, this is the central theme of the paper. The author has assumed that the traditional fundamental sine-wave voltage is (except for starting or outside influences) a steady state condition, with a maximum and a RMS value. Where as the voltage waveform supplied by a PWM drive can have significant harmonics and transients which may alter the motor performance characteristics and life expectancy. The effects of the maximum voltage, rate of rise, switching frequencies, capacitors, resonance and harmonics will all be considered.

• Research Organization: Electric Power Research Inst., Palo Alto, CA (United States); CK and Associates, Albany, CA (United States)
• OSTI ID: 376837
• Report Number(s): EPRI-TR--104581; CONF-9311343--
• Country of Publication: United States
• Language: English

Related Subjects

24 POWER TRANSMISSION AND DISTRIBUTION
42 ENGINEERING
CONTROL
ELECTRIC MOTORS
ELECTRIC POTENTIAL
ELECTRICAL TRANSIENTS
MITIGATION
VARIATIONS