Method and apparatus for controlling the speed of induction moto

Electricity: motive power systems – Motor-reversing – Armature or primary circuit control

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318230, 318231, H02P 540

Patent

active

039834638

ABSTRACT:
In a method and apparatus for controlling the speed of an induction motor energized from a source of variable frequency, e.g. a controllable inverter, a control signal which is a function of the primary current of the induction motor is produced, a predetermined slip frequency pattern signal is generated in accordance with the control signal, and the source is controlled in accordance with the slip frequency pattern signal for controlling the operating frequency. By suitably determining the shape of the slip frequency pattern signal it is possible to operate the induction motor with either one of normal induction motor characteristic, DC series motor characteristic, DC shunt motor characteristic, DC weak field motor characteristic and DC compound motor characteristic, and to operate the induction motor for smooth and continuous power regeneration.

REFERENCES:
patent: 3500158 (1970-03-01), Landau et al.
patent: 3512067 (1970-05-01), Landau
patent: 3529223 (1970-09-01), Vergez, Jr.
patent: 3593083 (1971-07-01), Blaschke
patent: 3718847 (1973-02-01), Graf et al.
patent: 3769564 (1973-10-01), Rettig

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