Barrier movement operator speed control

Details Barrier movement operator speed control Barrier movement operator speed control

2006-05-09

2006-05-09

Duda, Rina (Department: 2837)

Electricity: motive power systems

Automatic and/or with time-delay means

C318S466000, C318S468000, C318S280000, C318S432000, C049S026000, C049S028000

Reexamination Certificate

active

07042183

ABSTRACT:
Methods and apparatus for controlling the speed of an A.C. induction motor are disclosed and shown in operation for controlling the movement of a barrier. Included are voltage configuration circuits which selectively gate portions of the half-cycles of AC mains voltage to the induction motor. When the motor is started increasing amounts of mains AC voltage is applied to the motor and decreasing portions of the mains AC are applied to the motor during a stopping routine. The motor can also be energized with less than full mains AC to permit differences in barrier movement speed dependent on operating parameters.

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