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Electric motors driven by pulse-width modulated (PWM) waveforms exhibit different power loss and heating characteristics than line-fed motors. Experimental results indicate that motor losses and heating increase as the drive switching frequency decreases. Motor power losses for low switching frequencies are described, and if the increase in motor power loss is high enough such that motor overheating...
Studies show that the power cycling mean time to failure (MTTF) of the insulated-gate bipolar transistor (IGBT) bond wire in an adjustable speed drive may be very short under some very common conditions. This paper proposes a switching frequency reduction method based on the junction temperature variation (ΔTj) of an inverter IGBT. It has the following advantages. First, it reduces the pulsewidth-modulation...
Studies have shown that the power cycling Mean Time to Failure (MTTF) of the IGBT bond wire in an adjustable speed drive (ASD) may be very short under some very common conditions. This paper proposes a switching frequency reduction method based on junction temperature variation (DeltaTj) of the inverter IGBT. It has the following advantages. Firstly, it only reduces the PWM frequency under low speed...
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