Electricity: motive power systems – Induction motor systems – Braking
Patent
1992-08-13
1994-03-15
Wysocki, Jonathan
Electricity: motive power systems
Induction motor systems
Braking
318375, 318245, H02P 300
Patent
active
052948749
ABSTRACT:
A universal electric motor having an arbor mounted on a rotating armature with a run winding for generating a magnetic field having a polarity relative to the armature and for rotating the arbor, a first switch for connecting the run winding to a power source, and a brake winding for generating a counter magnetic field opposed with respect to the armature winding to that generated by the run winding. The brake winding operates when energized, to stop rotation of the arbor by generating a counter magnetic field which interacts with the magnetic field of the armature Also included is an electrical circuit for providing a residual magnetism in the stator iron to help stop the arbor rotation The circuit includes an energy storage capacitor for providing current to the brake winding thereby helping to begin generation of the counter magnetic field, a second switch for connecting the energy storage to the brake winding when the first switch disconnects the run winding from the power source, a biasing diode for biasing the energy storage capacitor to a predetermined polarity, a rectifying resistor and diode for coupling the energy storage capacitor to the power source and an alternate discharge path for discharging the energy stored in the event that the normal discharge path is inoperative.
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"Safer Power-Tool Braking", Machine Design, May 15, 1975, pp. 72-75.
Hessenberger Jeffrey C.
West Michael R.
Milwaukee Electric Tool Corporation
Wysocki Jonathan
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