Electricity: motive power systems – Induction motor systems – Primary circuit control
Patent
1989-08-23
1991-08-06
Shoop, Jr., William M.
Electricity: motive power systems
Induction motor systems
Primary circuit control
318727, 318817, 318799, 318280, 318751, 100229A, B30B 1522, H07P 140
Patent
active
050380915
ABSTRACT:
An electronic control for a motor which eliminates the motor centrifugal switch and more particularly a control for a domestic refuse compactor which permits the user to control the approximate full trash bag weight and obtain more compaction from a split phase induction drive motor. A ferrite core sensor on the main winding of the drive motor samples the lagging phase angle of the motor main winding current during a compaction stroke. A low force cycle is achieved by terminating the stroke as soon as phase samples fall below a threshold defined at the start of each cycle by a locked motor main winding phase sample acquired prior to starting the motor. A medium force cycle terminates the stroke when compaction forces exceed the main winding breakdown torque. A high force cycle is achieved by re-activating a motor start winding when compaction forces exceed the main winding breakdown torque and terminating the stroke as soon as the phase samples exceed a threshold defined at the start of each cycle during motor starting. The control uses programmed referencing techniques to eliminate factory pre-calibration.
REFERENCES:
patent: 3337756 (1967-08-01), Mendenhall
patent: 3918359 (1975-11-01), Hennells et al.
patent: 4379986 (1983-04-01), Baxter et al.
patent: 4436030 (1984-03-01), Ciciora
patent: 4481786 (1984-11-01), Bashark
patent: 4555654 (1985-11-01), Spradling et al.
patent: 4781111 (1988-11-01), Chesnut
patent: 4804911 (1989-02-01), Pertessis et al.
patent: 4809600 (1989-03-01), Yamamoto et al.
Cabeca John W.
Krefman Stephen D.
Roth Thomas J.
Shoop Jr. William M.
Turcotte Thomas E.
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