Electricity: motive power systems – Braking – Dynamic braking
Patent
1993-07-01
1995-09-19
Ro, Bentsu
Electricity: motive power systems
Braking
Dynamic braking
318376, 318254, H02P 310
Patent
active
054518326
ABSTRACT:
A method and circuit for braking a forward rotation of a rotor of a polyphase DC motor. A commutation sequencer is incremented by several phases to produce an incremented commutation sequence to produce a magnetic flux vector that lags a magnetic pole of the motor. Driving currents are applied to coils of the motor in accordance with the incremented commutation sequence to brake the rotor. The method is implemented in a circuit that has a sequencer for incrementally generating sets of commutation signals to select stator coils for energization to rotate the rotor. A power stage to which the commutation signals are applied energizes the selected coils in accordance with the commutation signals. A circuit interrupts the energization of the selected coils and the commutation sequence is altered to produce a sequence that produces a negative torque on the rotor. Circuits are also provided to inhibit application of the altered commutation sequence until recirculation currents in the power stage caused by the coils in response to the reduction of the input voltage have fallen below a predetermined level, and to inhibit application of the altered commutation sequence until a voltage on a sense resistor between the power stage and a reference potential has fallen below a predetermined level after an operation of the circuit for interrupting the energization of the selected coils.
REFERENCES:
patent: 4127799 (1978-11-01), Nakamura et al.
patent: 4782272 (1988-11-01), Buckley et al.
patent: 5010283 (1991-04-01), Kitajima et al.
patent: 5250883 (1993-10-01), Okada
Cameron Scott W.
Schlager Karl M.
Anderson Rodney M.
Bachand Richard A.
Jorgenson Lisa K.
Ro Bentsu
SGS-Thomson Microelectronics Inc.
LandOfFree
Method and circuitry for drag braking a polyphase DC motor does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method and circuitry for drag braking a polyphase DC motor, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and circuitry for drag braking a polyphase DC motor will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1830253