AC motor control system

Details AC motor control system AC motor control system

1984-08-20

1986-12-02

Smith, Jr., David

Electricity: motive power systems

Induction motor systems

Primary circuit control

318808, H02P 540

Patent

active

046267620

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: 4310791 (1982-01-01), Akamatsu
patent: 4364109 (1982-12-01), Okado et al.

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