Motor driving device and vacuum pump
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United States of America Patent
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-
Dec 6, 2016
Grant Date -
Apr 24, 2014
app pub date -
Oct 15, 2013
filing date -
Oct 23, 2012
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A motor driving device comprises: an inverter having a plurality of switching elements for driving a motor; an arithmetic section for calculating a rotational speed and a magnetic pole electric angle of a motor rotor based on information about a motor phase voltage and information about a motor phase current; a delay correcting section for correcting a phase delay of the magnetic pole electric angle calculated by the arithmetic section so as to generate corrected magnetic pole electric angle; a driving command generating section for generating a sinusoidal wave driving command based on a difference between the rotational speed and a target rotational speed and the corrected magnetic pole electric angle; and a PWM signal generating section for generating a PWM control signal for controlling on/off of the plurality of switching elements based on the sinusoidal wave driving command.
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