Electricity: motive power systems – Induction motor systems – Braking
Patent
1986-02-27
1987-08-18
Smith, Jr., David
Electricity: motive power systems
Induction motor systems
Braking
318778, 318786, H02P 142
Patent
active
046879820
ABSTRACT:
In a single phase AC motor having a main winding (1) and an auxiliary winding (2) both connectable to an AC power source (4), and having a start switch (24, 49) for automatically connecting and disconnecting the auxiliary winding to and from the AC source (4) in starting and running modes, respectively, and having a user operated reversing switch (7-12) for reversing the voltage polarity applied from the AC source (4) to one of the windings relative to the other winding, circuitry is provided for detecting the polarity reversal by sensing when one of the main and auxiliary winding voltages shifts from a leading to a lagging position relative to the other winding voltage, whereupon the circuit automatically instantly reconnects the auxiliary winding (2) to the AC source (4) to immediately apply reverse torque. A reinitiation signal (140, 141) is generated during each cycle of the AC source (4) until the motor speed is reduced to zero, to thus repeatedly apply reverse torque to the motor until it can accelerate in the opposite direction of rotation. The detection of the polarity reversal is instantaneous, depending only on sensed phase shift. The application of reverse torque is substantially instantaneous, depending only on discharge time of an initiation capacitor (55).
REFERENCES:
patent: 2886756 (1959-05-01), Schaefer
patent: 3421064 (1969-01-01), Phillips
patent: 3518491 (1970-06-01), Downs
patent: 3525904 (1970-08-01), Ringstad
patent: 3671830 (1972-06-01), Kruper
patent: 3792324 (1974-02-01), Suarez et al.
patent: 4375613 (1983-03-01), Fuller et al.
patent: 4438382 (1984-03-01), Vuckovich et al.
PT Components, Inc.
Smith Jr. David
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