AC Motor control method

Details AC Motor control method AC Motor control method

1982-11-02

1985-02-12

Smith, Jr., David

Electricity: motive power systems

Induction motor systems

Primary circuit control

318807, H02P 540

Patent

active

044994141

ABSTRACT:
A method of controlling an AC motor which exhibits a constant torque characteristic at a rotational speed N below a base speed Nb and a constant output characteristic at a rotational speed N above the base speed Nb, comprising the steps of finding a base speed N.sub.L after limiting the output power of the AC motor, N.sub.L being derived from the base speed Nb and the ratio .eta. between maximum output power Pmax.sub.1 and maximum output power Pmax.sub.2 before and after the output power of the AC is limited, respectively, rendering the slip frequency of the AC motor constant until the rotational speed N of the AC motor reaches the base speed N.sub.L, varying the slip frequency in inverse proportion to the rotational speed N for N between N.sub.L and Nb (N.sub.L <N.ltoreq.Nb), and varying the slip frequency in proportion to the rotational speed N for N above Nb (Nb<N), whereby the output power of the AC motor is rendered constant at a rotational speed N above N.sub.L.

REFERENCES:
patent: 3477002 (1969-11-01), Campbell
patent: 3899725 (1975-08-01), Plunkett
patent: 3983463 (1976-09-01), Nabae et al.
patent: 4281276 (1981-07-01), Cutler et al.
patent: 4392100 (1983-07-01), Stanton et al.
IEEE 1980 IECI Proceedings on Applications of Mini and Microcomputers, Mar. 17th-20th 1980, pp. 45-52, Philadelphia, (U.S.A.): V. V. Athan et al., "Microprocessor Control of a Three Phase Invertor Used in Induction Motor Speed Control System".

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