Current controlling method for servo motor

Details Current controlling method for servo motor Current controlling method for servo motor

1996-06-28

1998-03-10

Ro, Bentsu

Electricity: motive power systems

Constant motor current, load and/or torque control

318599, 318606, 318632, 318809, H02P 736

Patent

active

057265453

ABSTRACT:
A current control method for a servo motor capable of compensating a delay in a current loop. A corrective electrical angle corresponding to the delay in the current loop is obtained and a phase angle is corrected using the corrective electrical angle. Then the delay of the current loop is compensated by a DQ coordinate conversion for converting a three-phase AC current into a two-phase DC current, or a two-phase DC voltage into a three-phase AC voltage, using the corrected phase angle. The phase angle is corrected by subtracting the corrective electrical angle from the phase angle and the DQ conversion is performed for obtaining a two-phase DC current from a three-phase AC current using the corrected phase angle. Alternatively, the phase angle is corrected by adding the corrective electrical angle to the phase angle and the DQ conversion is performed for obtaining a three-phase AC voltage from a two-phase AC voltage using the corrected phase angle, to compensate the delay of the current loop.

REFERENCES:
patent: 4540925 (1985-09-01), Jones
patent: 5361210 (1994-11-01), Fu

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