| 摘要 |
PROBLEM TO BE SOLVED: To solve the problem that, it is desired that a magnetic pole position being fixed by applying a DC current of a predetermined phase from a door control part 45 to a permanent magnet synchronous motor 41 that drives a cage door of an elevator is taken as being equal to a predetermined phase, but, the magnetic pole position is deviated from the predetermined phase because a self-closing force acting on a getting-in door that engages with the cage door affects on the motor 41.SOLUTION: An actual magnetic pole position at the time of fixing is calculated on the basis of the measurement by an encoder 46 attached to the motor 41. In short, a measurement result of the encoder 46 is taken into a magnetic pole position counter 451c. The content is referenced by a magnetic pole position estimation part 456 to calculate the magnetic pole position, for understanding a deviation amount from the predetermined phase. |
