DRIVE APPARATUS OF ELECTRIC MOTOR AND ELECTRIC PUMP APPARATUS
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United States of America
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Issued Date -
Feb 6, 2020
app pub date -
Jul 30, 2019
filing date -
Jul 30, 2019
priority date (Note) -
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Abstract
A drive apparatus of an electric motor which does not include a position detection sensor, the drive apparatus includes drive portion configured to drive the electric motor on the basis of a command value inputted from outside, a number-of-rotations detection portion configured to detect a number of rotations of the electric motor driven by the drive portion, an out-of-phase judgement portion judging that the electric motor is out of phase in a case where the number of rotations detected by the number-of-rotations detection portion is less than a predetermined threshold value, and the predetermined threshold value being configured to be changed on the basis of the command value inputted from outside.
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