Electricity: motive power systems – Induction motor systems – Primary circuit control
Patent
1991-12-09
1993-03-23
Shoop, Jr., William M.
Electricity: motive power systems
Induction motor systems
Primary circuit control
318802, 318823, H02P 726
Patent
active
051967782
ABSTRACT:
A gain change-over switch according to the present invention serves to change over at least one of a current loop gain and a velocity loop gain to a value of the gain greater than that in other modes, in the case where a rotational-position control mode is selected as a control mode of the induction motor out of a rotational-speed control mode and a rotational-position control mode or where the rotational-position control mode is chosen and at the same time, a work mode for driving a work piece to work the same is selected, whereby an induction motor is controlled with high accuracy. Further, an exciting change-over switch according to the present invention serves to select a reinforcement exciting circuit for producing the secondary flux in the induction motor, which is greater than that produced by a weakening variable exciting circuit, only in the case where the rotational-position control mode and in the work mode are selected, thereby to control the induction motor with high accuracy. In other modes, the change-over switch serves to select the weakening variable exciting circuit for variably controlling the excitation-component of the primary current to produce the secondary flux corresponding to a torque component developed by the primary current.
REFERENCES:
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patent: 4028600 (1977-06-01), Blaschke et al.
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patent: 4713596 (1987-12-01), Bose
patent: 5027280 (1991-06-01), Ando et al.
J. M. D. Murphy, Thyristor Control of A.C. Motors, Pergamon Press, 1973, pp. 120-122.
Cabeca John W.
Mitsubishi Denki & Kabushiki Kaisha
Shoop Jr. William M.
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