Electricity: motive power systems – Braking – Automatic and/or with time-delay means
Patent
1998-10-02
2000-06-20
Ro, Bentsu
Electricity: motive power systems
Braking
Automatic and/or with time-delay means
318380, H02P 312
Patent
active
060781564
ABSTRACT:
The present invention provides efficient dynamic braking of a DC motor to complement servo loop control. This invention uses a combined technique where, first, a reversed-torque signal is applied to a standard motor controller that then reverses armature current to initiate braking and, second, a dissipative load is switched between the DC voltage bus and ground in order to dissipate the regenerated current as the motor slows. As braking action continues, the dissipative load is repeatedly switched into and out of the circuit, whenever voltage on the DC voltage bus, caused by regenerated current, exceeds a selected threshold. Hysteresis is provided to maintain current flow for a controlled period, providing a pulse-width modulation of the switching action. The invention allows controlled, fast braking for repeated operations and improves overall servo positional control in high-inertia applications, such as for an image processing apparatus using an imaging drum. This invention also permits controlled braking in the event of power loss, using regenerated energy from the motor to power braking control circuitry.
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Blish Nelson Adrian
Eastman Kodak Company
Novais David A.
Ro Bentsu
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