Electricity: motive power systems – Plural diverse motor controls – Running-speed control
Patent
1995-11-13
1998-12-08
Sircus, Brian
Electricity: motive power systems
Plural diverse motor controls
Running-speed control
318375, 310 77, H02P 100
Patent
active
058475222
ABSTRACT:
A positive locking device is provided in order to prevent a motor from rotating after power has been removed. The positive locking device has a plate mounted on the motor which engages a disk or hub on the shaft of the motor. In another aspect of the invention, solid state circuitry for switching a permanent magnet motor and providing dynamic braking thereto is provided. The circuitry allows the back EMF generated by the armature coils of a permanent magnet motor to cause a current to flow through the motor when power is removed. This back EMF may be used to help produce smooth engagement of the locking device. In another aspect of the invention, a dynamic braking circuit for a dual armature permanent magnet motor is provided. By applying current to one or the other of two oppositely wound armature coils the motor is made to rotate in either direction. When power is removed from the active armature, this armature is short-circuited through a diode. The same diode is used to dynamically brake the motor when power is removed from the other armature. In both cases the spinning rotor will quickly slow down to facilitate smooth engagement of the positive locking device.
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patent: 5517837 (1996-05-01), Wang
"Permanent magnet dc motor with dynamic braking over entire actuator stroke range", etc., Standard Electrical Schematics, GEC-Marconi Aerospace Inc., Whippany, New Jersey, two pages. No Date.
"Permanent magnet dc motor with dynamic braking over entire stroke range", etc., Standard Electrical Schematics, GEC-Marconi Aeorspace Inc., Whippany, New Jersey, two pages, at least as early as Apr. 1981.
Egbert, III Walter M.
GEC-Marconi Aerospace Inc.
Jackson Robert R.
Sircus Brian
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