Method and apparatus for electrical dynamic braking

Details Method and apparatus for electrical dynamic braking Method and apparatus for electrical dynamic braking

1993-03-23

1994-11-01

Shoop, Jr., William M.

Electricity: motive power systems

Braking

Dynamic braking

H02P 312

Patent

active

053610229

ABSTRACT:
A dynamic braking circuit for use with bi-directional conveyor systems and other equipment having a soft start/hard stop capability in both directions of movement. The circuit electrically brakes the rotation of a DC motor by short-circuiting the armature of the motor, thereby creating a reverse current and reverse magnetic field to oppose the motor's rotation. The circuit uses high-voltage, high-current SCR's to switch the motor running current (in both directions) and to brake the motor as quickly as is possible for a braking circuit that uses such reverse current. The circuit thereby operates without the use of any in-series braking resistors or "smoothing" inductors which lower the magnitude of the reverse current. The SCR's are gated "on" in pairs per each half-cycle of the AC power supply, which enhances noise immunity of the overall SCR control circuit.

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Technical data Sheet Lattice Semiconductor Corporation, High Performan E.sup.2 CMOS PLD Generic Array Logic.TM., Hillsboro, Oregon, Apr. 1991.

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