Title:
DETECTOR FOR POSITION OF MAGNETIC POLE IN MOTOR
Document Type and Number:
Japanese Patent JP3312472
Kind Code:
B2
Abstract:
PURPOSE: To reduce cost and prevent disadvantages, such as degradation in performance, erroneous wiring and disconnection, due to wiring for obtaining power supply to a sensor and sensor output, by detecting in sensorless manner the positions of the magnetic poles in a motor which are electrically salient.
CONSTITUTION: The present invention relates to a system wherein the positions of magnetic poles in a motor which are electrically salient as in synchronous machines, are detected, and wherein the motor is driven by means of a driving device using a variable-voltage variable-frequency power supply. The system includes a coordinate transformer 4a and an inverter 8 for applying alternating voltage to the motor 1; a detector 5 for motor current; a coordinate transformer 4b that divides the detected motor current into the components parallel to the applied alternating voltage and the components orthogonal thereto; a phase difference detector 6 that detects the positions of the magnetic poles in the motor 1 according to the parallel components and the orthogonal components of the motor current; and an adder 7.
Inventors:
Takashi Aihara
Application Number:
JP5502594A
Publication Date:
August 05, 2002
Filing Date:
March 01, 1994
Export Citation:
Assignee:
Fuji Electric Co., Ltd.
International Classes:
H02P6/16; H02P6/06; H02P6/08; H02P6/28; H02P21/00; H02P25/022; H02P25/026; H02P25/08; H02P25/098; H02P27/06; H02P29/40; (IPC1-7): H02P6/16; H02P7/05; H02P7/63
Domestic Patent References:
| JP4359691A | ||||
| JP491693A | ||||
| JP2206384A | ||||
| JP5146191A |
Attorney, Agent or Firm:
Yuichi Morita