| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a failure prevention device for a regeneration and power factor function that can suppress the deterioration of a regeneration brake function, and can recover it by discriminating a sign of a failure before the brake function possessed by an electric motor is failed. <P>SOLUTION: The failure prevention device for the regeneration and power factor function comprises: a failure sign discrimination circuit 21 that discriminates the state of the sign before the failure of the regeneration brake function occurs when the electric motor is used as a generator; and a function deterioration suppression and recovery circuit 22 that suppress the deterioration of the regeneration brake function of the electric motor and the deterioration of a driving function, and recovers them by decelerating the driving speed or the acceleration/deceleration speed of the electric motor by discriminating the state of the sign before the failure caused by the failure sign discrimination circuit 21 occurs. The failure sign discrimination circuit 21 comprises: an unexpected temperature rise discrimination means 21a that detects at least the temperature of either the electric motor or an inverter, and discriminates a state that the temperature is unexpectedly raised; and an unexpected speed difference discrimination means 21b or the like that detects the working speed of a working body operated by the electric motor, and discriminates a state that a speed difference between the working speed and a command speed commanded by an operation signal is an unexpected difference. <P>COPYRIGHT: (C)2007,JPO&INPIT |
