| 摘要 |
PROBLEM TO BE SOLVED: To judge the failure in a magnetic pole position detector and to stop an elevator without causing it to be out of control by judging the right and wrong of the magnetic pole position detector in comparison with the current value of a permanent magnet synchronous motor. SOLUTION: An elevator device is provided with a PWM inverter 2 for supplying current to a permanent-magnet synchronous motor 1, detects current with a current detector 12, and detects the magnetic pole position of the permanent-magnet motor 1 with a magnet position detector 8. Then, a judgment circuit 20 for judging the failure of the magnetic pole position detector is provided. For example, when an AC current is supplied to the permanent-magnet synchronous motor 1, a torque is generated and a traction machine 3 that is connected to the permanent-magnet synchronous motor 1 is rotated. By controlling the rotary speed of the permanent-magnet synchronous motor 1, the speed of an elevator can be controlled. The judgment circuit 20 judges the right or wrong of the magnetic pole position signal. When it judges that the magnetic pole position signal is wrong, it reports the failure in the magnetic pole position detector 8 and stops the elevator. |
