H - Electricity – 02 – P
Patent
H - Electricity
02
P
318/120
H02P 7/28 (2006.01) H02P 7/29 (2006.01)
Patent
CA 1184243
ELECTRIC MOTOR SPEED CONTROLLER AND METHOD Abstract of the Disclosure An electric motor speed controller circuit which comprises at least one power transistor in series between the motor and a power supply to form a power circuit such that current flows between the power supply and the motor through the transistor only when a signal current is supplied to the base of the transistor and which further comprises a control circuit for supplying a signal to the base of the transistor which signal is pulse width modulated so that the width of the pulse is proportional to the value of a variable resistance, inductance or capacitance of the speed control; A method for controlling the speed of an electric motor which comprises varying the resistance, inductance or capacitance of a speed control and supplying a pulse width modulated signal current, having pulse widths proportional to the value of the varied resistance, capacitance or inductance, to the base of at least one power transistor to activate the transistor which is connected by its emitter and collector, as an electrical switch in series between the motor and a power supply; A variable speed motor controlled by the speed controller circuit; and A vehicle powered by a motor controlled by the speed controller circuit.
379655
Cudlitz Stephen
Gowling Lafleur Henderson Llp
LandOfFree
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