Patent ID: 9537433
Date: 2017-01-03
CPC Classifications: H02P

Claim:
1. A motor drive device comprising: an inverter circuit that generates voltage to drive a motor using current supplied from a power source; a current detection section that detects the current flowing between the power source and the inverter circuit; a voltage control section that outputs a control signal to cause the inverter circuit to generate the voltage for driving the motor at a predetermined rotation speed; and a rotation speed suppression section that suppress a rotation speed of the motor, wherein the rotation speed suppression section executes the following: (i) obtaining a value of the current as a peak value, the current detected by the current detection section at a timing at which the control signal rises from low level to high level, (ii) performing a first determination regarding whether or not the peak value reaches a threshold value or higher, (iii) outputting an instruction to the voltage control section to reduce the rotation speed of the motor, if the result of the first determination is positive.