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Title:
POLE RECOGNITION METHOD FOR SYNCHRONOUS MOTOR
Document Type and Number:
Japanese Patent JP2002247881
Kind Code:
A
Abstract:

To highly precisely recognize a pole position of a rotor of a synchronous motor by slightly turning the motor for avoiding the influence of disturbances such as a gravitational load, etc.

A first displacement information data V0C of a rotor pole, whose d-axis angle obtained by dividing into d-q axes is different from a reference phase θ0, determined by an exciting current applied to an armature coil of a synchronous motor, by an angle θ when a field phase command is the reference phase θ0, is detected (step 3). A displacement information data V180, when the field phase command is (θ+180°), is detected (step 4). A displacement information data V-90, when the field phase command is (θ-90°), is detected (step 5). A displacement information data V+90, when the field phase command is (θ+90°), is detected (step 6). The difference Δ1 between the displacement data V180 and the displacement data V0 and the difference Δ2 between the displacement data V+90 and the displacement data V-90 are obtained (steps 7 and 8). The angle θ is obtained from tan-1(Δ1/Δ2) (step 9). The pole position of the rotor is recognized as (θ0+θ) (step 13).


Inventors:
Ito, Akihiro
Application Number:
JP2001000042497
Publication Date:
August 30, 2002
Filing Date:
February 19, 2001
Export Citation:
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Assignee:
SANKYO SEIKI MFG CO LTD
International Classes:
H02P6/16; H02P6/15; H02P21/00; H02P21/22; H02P25/022; H02P25/026; H02P27/04; H02P29/00; (IPC1-7): H02P6/16; H02P5/00; H02P21/00
Attorney, Agent or Firm:
村瀬 一美