Electricity: motive power systems – Motor-reversing – Periodic- or intermittent-reversing
Patent
1998-08-19
1999-06-22
Sircus, Brian
Electricity: motive power systems
Motor-reversing
Periodic- or intermittent-reversing
318286, 318291, 310127, H02P 100
Patent
active
059145765
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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Egbert, III Walter M.
GEC-Marconi Aerospace Inc.
Jackson Robert R.
Sircus Brian
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