| 摘要 |
<P>PROBLEM TO BE SOLVED: To properly demagnetize a permanent magnet that a motor has. <P>SOLUTION: A demagnetization judger 69 judges whether or not it is a demagnetization mode where the execution of three-phase short circuit control of a motor is requested and opens the connection between a motor 1 and a drive wheel W by a clutch C, in the demagnetization mode, and a hydraulic controller 13 increases the induced voltage constant Ke by setting the motor 1 in somewhat stronger field state, and an ENG controller 43 executes the high-revolution control of an engine. A short circuit judger 70 outputs a phase short circuit command to order a PWM signal generator 57 to output a switching command for setting each transistor of the high-side arm or low-side arm of the PWM inverter of a PDU41 to ON or a command to order a current meter 65 to meter and output a phase current (in short, a short circuit current), in case that the number NM of revolutions is larger than a specified Nref in condition that the demagnetization judger 69 judges it in the demagnetization mode. <P>COPYRIGHT: (C)2008,JPO&INPIT |
