System for controlling the rotation of AC motors
Assigneeebm Werke GmbH & Co.
InventorsAndrás Lelkes, Jens Krotsch
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Abstract
The present invention relates to a system for controlling the rotation speed of AC motors, in particular single phase motors. In this case, a controllable electronic switching device is connected upstream of the motor and is actuated by a control unit such that a sinusoidal input AC voltage is used to produce a motor AC voltage which can be varied in order to change the rotation speed. The control unit is designed in such a manner that the fundamental frequency and/or the amplitude of the motor AC voltage can be varied by phase gating.
Claims36
A system for controlling the rotational speed of a single phase AC motor comprising a controllable electronic switching device which is connected upstream of the AC motor and is actuated by a control unit such that a constant frequency sinusoidal input AC voltage is used to produce a motor AC voltage which can be varied in order to change the rotation speed, wherein the control unit provides that the fundamental frequency of the motor AC voltage can be varied by phase-gating.
Dependencies are inferred from the claim text.