To solve the problems that timer resolution needs to be improved in a microcomputer since a high drive speed of a switching element is required to superpose a high-frequency current to a drive current in a conventional rotation angle detector, and turn-on or turn-off speed in the switching element should be increased.
A rotation angle detector of a polyphase motor driven by allowing the drive current to flow to winding for drive comprises winding 7b for position detection provided adjacent to the wiring 7a for drive; and a rotation angle detection means 11 for detecting the rotational angle of the polyphase motor, based on the current vector track or the voltage vector track of high-frequency current flowing to the wiring for position detection, when a high-frequency current whose frequency is higher than that of the drive current is supplied to the wiring for position detection.
| JP2004208364 | CURRENT-SENSORLESS CONTROL METHOD AND APPARATUS FOR SYNCHRONOUS MOTOR |
| JPH05146132 | BRUSHLESS MOTOR |
| JP2010051162 | CONTROLLING APPARATUS AND METHOD OF PM MOTOR |
| JP2001339999A | 2001-12-07 | |||
| JPH10229699A | 1998-08-25 | |||
| JPH09215369A | 1997-08-15 | |||
| JP2005333761A | 2005-12-02 | |||
| JPH11168867A | 1999-06-22 | |||
| JPS63213494A | 1988-09-06 | |||
| JP2004080986A | 2004-03-11 |
Shiro Fujitani
Kiyoshi Kuruma
Naoki Takeuchi
Next Patent: METHOD AND APPARATUS FOR COLLECTING CURRENT IN RAILROAD VEHICLE