Motor driving device and vacuum pump
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United States of America Patent
Stats
-
Apr 16, 2019
Grant Date -
Jul 31, 2014
app pub date -
Dec 20, 2013
filing date -
Jan 28, 2013
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A motor driving device comprises a first arithmetic section calculating a rotational speed and a magnetic pole electrical angle of a motor rotor, a current command setting section setting a d-axis current command and a q-axis current command in a rotating coordinate dq system based on a difference between the rotational speed and a target rotational speed, a driving command generating section generating a sinusoidal wave driving command based on the d-axis current command, the q-axis current command, the rotational speed and the magnetic pole electrical angle and a PWM signal generating section. When the rotational speed has a positive value indicating a positive rotational state, the current command setting section sets the q-axis current command of acceleration driving, and when the rotational speed has a negative value indicating a reverse rotational state, the current command setting section sets the q-axis current command of deceleration driving.
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