Inverter device for driving electric motor
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United States of America Patent
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-
Mar 1, 2016
Grant Date -
Dec 4, 2014
app pub date -
May 29, 2014
filing date -
May 30, 2013
priority date (Note) -
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status (Latency Note)
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Abstract
An object of the present invention is to provide an inverter device for driving an electric motor, which allows control stability and efficiency to be ensured over a wide region of the speed of the electric motor. The inverter device includes a rotational-speed detection section which detects a rotational speed of the electric motor, a carrier-frequency calculation section which calculates a carrier frequency on the basis of the detected rotational speed, and a carrier-frequency switching section which switches, on the basis of the calculated carrier frequency, the carrier frequency used for performing PWM control on the electric motor. The carrier-frequency calculation section calculates, as the carrier frequency, a frequency increased with an increase in the electric-motor rotational speed detected by the rotational-speed detection section.
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