Control apparatus for a variable speed motor

Details Control apparatus for a variable speed motor Control apparatus for a variable speed motor

1994-08-11

1996-04-09

Shoop, Jr., William M.

Electricity: motor control systems

Closed loop speed control system for dc motor with commutator

Armature control by digital or combined analog and digital...

318800, 318806, 318439, 318772, G05F 110

Patent

active

055069304

ABSTRACT:
The present invention provides a control apparatus that stably controls a mechanical system incorporating a variable speed motor by suppressing mechanical vibrations without requiring the use of a motor speed detector. In accordance with the present invention, a power converter driving the motor is controlled based on a result fed from a weighting adder that calculates a weighted sum of the mechanical system's state variables, which are estimated by a first state observer to which detected current and voltage values are fed, and a target current value or a target voltage value. Alternatively, the power converter is controlled based on a result fed from a weighting adder that calculates a weighted sum of the state variables, which are estimated by a second state observer to which detected current value and a target voltage value are fed, and a target current value or a target voltage value. As an additional alternative, mechanical vibrations are suppressed by providing a control apparatus having a combination of a current regulator and a filter, thereby providing the control apparatus with high-frequency characteristics which show a small phase delay and a low gain while preventing response deterioration and control error by increasing feedback gain in a low frequency region.

REFERENCES:
patent: 4986150 (1991-01-01), Okazaki
patent: 5057759 (1991-10-01), Ueda et al.
patent: 5296793 (1994-03-01), Lang
patent: 5296794 (1994-03-01), Lang et al.
patent: 5384527 (1995-01-01), Rozman et al.
"Speed Control of Direct-Current Drives-Using a State and Disturbance Observer" by Von G. Weihrich in Regelungstechnik, H.11, Jan. 1978, S.349-354; S.350.

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