| 摘要 |
<P>PROBLEM TO BE SOLVED: To solve such a problem that vibration and noise of a motor increase in a low speed region of an electric motor in a single piston rotary compressor, for example, where variation in a load torque is large during a single rotation of the rotor of an electric motor, and deterioration in step-out resistance becomes conspicuous. <P>SOLUTION: An electric motor driver which can prevent step-out of a motor and can operate continuously and stably is attained by providing a target-number-of-revolutions correction means 11, and avoiding the low speed region by correcting the target number of revolutions when the amount of a torque command determined by a torque control means 21 and a pressure value detected by a delivery pressure detection means 22 are larger than preset values, thereby controlling an increase in vibration and noise of the motor during overload. <P>COPYRIGHT: (C)2010,JPO&INPIT |
