Title:
DEVICE FOR CONTROLLING PERMANENT MAGNET SYNCHRONOUS MOTOR
Document Type and Number:
Japanese Patent JP3471269
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To re-drive a motor out of synchronism by detecting power restoration after power interruption.
SOLUTION: When a motor 1 is caused to be out of synchronism due to momentary power failure an the like during a synchronous operation, a control circuit 16 short-circuits stator windings by turning on IGBT 9b or 9f at the lower phase of an inverter circuit 8 at power restoration. A current detecting sensor 12u or 12w and a current detecting circuit 13 detect the current caused by the induced voltage. A control device 17 made of a phase estimation circuit 14, a speed estimating circuit 15 and a control circuit 16 drives the motor 1 again by estimating the magnetic pole position and rotational speed of a rotor, computing the operation voltage and operation frequency, and controlling the inverter circuit 8 with PWM and its switching.
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Inventors:
Hisanori Shibata
Yoshinobu Nakamura
Yoshinobu Nakamura
Application Number:
JP35885899A
Publication Date:
December 02, 2003
Filing Date:
December 17, 1999
Export Citation:
Assignee:
Toshiba Corporation
International Classes:
H02P6/18; H02P6/06; H02P6/08; H02P6/17; H02P6/182; (IPC1-7): H02P6/18
Domestic Patent References:
| JP5268794A | ||||
| JP8331894A | ||||
| JP8172788A |
Attorney, Agent or Firm:
Tsuyoshi Sato