Electricity: motor control systems – Open loop speed control system for dc motor with commutator – Analog armature control
Patent
1993-12-03
1996-11-19
Sireus, Brian
Electricity: motor control systems
Open loop speed control system for dc motor with commutator
Analog armature control
388856, 318814, 318380, 318508, H02P 708
Patent
active
055771556
ABSTRACT:
A motor speed controller for use with dc motors, such as found in model (slot) cars, is provided by a plurality of pairs of oppositely-poled voltage-sensitive threshold conduction devices which are selectively connected so as to be controllably inserted between a source of operating voltage and the dc motor. In a preferred embodiment of the invention, the voltage-sensitive threshold conduction devices advantageously comprise a series connection of diode bridges which are sequentially included in the energizing path of the motor.
Furthermore, the controller provides a speed sensitive brake function by controllably connecting at least one voltage-sensitive threshold conduction device across the windings of the dc motor. When so connected, this allows the voltage generated by the spinning motor to cause the voltage-sensitive threshold conduction device to be conductive until the motor speed slows to the point that the generated voltage no longer causes the device to conduct. Thereafter, the motor is effectively "open circuited" and therefore allowed to rotate freely.
REFERENCES:
patent: 3566227 (1971-02-01), Edhlund
patent: 3611092 (1971-10-01), Wilmunder
patent: 3924169 (1975-12-01), Craft et al.
patent: 4465958 (1984-08-01), Roberts
patent: 4506198 (1985-03-01), Savas
patent: 4751440 (1988-06-01), Dang
Edelman, Esq. Lawrence C.
Sireus Brian
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