E - Fixed Constructions – 05 – F
Patent
E - Fixed Constructions
05
F
E05F 5/00 (2006.01) E05F 15/14 (2006.01) H02P 7/00 (2006.01)
Patent
CA 2282071
The invention is a dynamic brake for a power door which is moved by an electric motor having at least two terminals. The motor is energized by a pulse width modulated door drive amplifier connected to a first power line and a second power line. The door drive amplifier has a first group of switches connecting the motor terminals to the first power line and it has a second group of switches connecting the motor terminals to the second power line. The dynamic brake has a brake control signal generator connected to receive an input signal indicative of a need to apply the dynamic brake and it has at least one output signal line connected to a control input of at least two of the switches in the first group of switches. The brake control signal generator responds to the input signal indicative of a need to apply the dynamic brake by supplying at least one control signal to the control inputs of at least two switches in the first group of switches so that the control signal(s) cause at least two switches to conduct and provide at least one dynamic brake current circuit for a braking current driven by an emf of the motor and hence dynamically braking the motor.
Macrae & Co.
Westinghouse Air Brake Company
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