Electricity: motive power systems – Braking – Dynamic braking
Patent
1995-06-07
1997-04-08
Ro, Bentsu
Electricity: motive power systems
Braking
Dynamic braking
318376, 318254, 369268, H02P 310
Patent
active
056191090
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: 4085355 (1978-04-01), Fradella
patent: 4127799 (1978-11-01), Nakamura et al.
patent: 4779260 (1988-10-01), Kaneko et al.
patent: 4782272 (1988-11-01), Buckley et al.
patent: 4864211 (1989-09-01), Kawaguchi
patent: 5010283 (1991-04-01), Kitajima et al.
patent: 5012166 (1991-04-01), Ushijima et al.
patent: 5172036 (1992-12-01), Cameron
patent: 5221881 (1993-06-01), Cameron
patent: 5250883 (1993-10-01), Okada
Cameron Scott W.
Schlager Karl M.
Galanthay Theodore E.
Jorgenson Lisa K.
Larson Renee M.
Ro Bentsu
SGS-Thomson Microelectronics Inc.
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