Apparatus and method for starting and controlling a motor

Details Apparatus and method for starting and controlling a motor Apparatus and method for starting and controlling a motor

1994-08-11

1996-04-30

Ro, Bentsu

Electricity: motive power systems

Induction motor systems

Primary circuit control

318785, 318786, 318789, H02P 144

Patent

active

055128092

ABSTRACT:
An apparatus and method for starting and controlling a motor comprises a timing circuit and a main control circuit. The timing circuit initiates a start-up period upon detecting power and provides an indication of the start-up period. The main control circuit receives the indication of the start-up period and applies variable magnitudes of power to a main winding of the motor. During the start-up period, the power applied to the main winding has a fixed, substantially maximum magnitude. During a period of normal operation following, the power applied to the main winding has a user-adjustable magnitude. The start-up period duration is as long as necessary for the motor to overcome a starting load thereon. Preferably, the timing circuit has a timer measuring the start-up period and a main relay signaling the start-up period to the main control circuit. Preferably, the apparatus also has a start-up relay and a start-up control circuit applying power to a start-up winding of the motor in addition to the power applied by the main control circuit to the main winding during the start-up period.

REFERENCES:
patent: 4052648 (1977-10-01), Nola
patent: 4100466 (1978-07-01), Schroeder
patent: 4298834 (1981-11-01), Opfer
patent: 4422030 (1983-12-01), McAllise
patent: 4806838 (1989-02-01), Weber
patent: 5139009 (1992-08-01), Walsh

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