Motor current phase delay compensating method and apparatus ther

Details Motor current phase delay compensating method and apparatus ther Motor current phase delay compensating method and apparatus ther

1991-08-14

1993-04-06

Ip, Paul

Electricity: motive power systems

Positional servo systems

With compensating features

318800, 318806, 318809, H02P 540

Patent

active

052006824

ABSTRACT:
This invention relates to a motor current phase delay compensating method and apparatus thereof enabling the driven system to efficiently operate by compensating current phase delay of the stator coil winding such that an alternating current servo motor for driving a FA system, a CNC, or a robot for industry generates maximum torque. An output signal of an A/D converter and a rotational direction discriminating signal of an alternating current servo motor are received whereby a phase delay value with respect to the speed is generated. The phase delay value and an output signal from the A/D converter are summed whereby a phase delay compensation amount is computed to compensate the phase delay amount. The phase delay compensation amount and an output from the speed PI controller are respectively received whereby U-phase and V-phase analog current reference instruction values area generated. The U-phase and V-phase analog current reference instruction values are summed and then inverted whereby a W-phase analog current reference instruction value is generated and thereby current delay flowing to the stator coil winding is properly compensated.

REFERENCES:
patent: 4096422 (1978-06-01), Fleming et al.
patent: 4358726 (1982-11-01), Iwakane et al.
patent: 4361794 (1982-11-01), Kawada et al.
patent: 4562396 (1985-12-01), Espelage et al.
patent: 4575667 (1986-03-01), Kurakake
patent: 4680525 (1987-07-01), Kobari et al.
patent: 4818927 (1989-04-01), Hino et al.

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