Hybrid drive circuit for variable speed induction motor system and methods of control
AssigneeRegal Beloit America, Inc.
InventorsLudovic Andre Chretien, Roger Carlos Becerra, Kamron Mark Wright, Lester Benjamin Manz
Life of this patent
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Abstract
Controllers for controlling hybrid motor drive circuits configured to drive a motor are provided herein. A controller is configured to drive the motor using an inverter when a motor commanded frequency is not within a predetermined range of line input power frequencies, and couple line input power to an output of the inverter using a first switch device when the motor commanded frequency is within the predetermined range of line input power frequencies.
Claims20
A motor controller, said motor controller configured to:
- operate a switch device electrically coupled in parallel with a run capacitor of a first motor, the switch device configured to bypass the run capacitor when a first commanded motor frequency is not within a predetermined range of line input power frequencies;
- and
- modulate two phases of a first inverter to apply a first output voltage to the first motor that is substantially equivalent to line input voltage when the first commanded motor frequency is within the predetermined range of line input power frequencies.
A method for controlling a motor, said method comprising:
- operating, by a motor controller, a switch device electrically coupled in parallel with a run capacitor of a first motor, the switch device configured to bypass the run capacitor when a first commanded motor frequency is not within a predetermined range of line input power frequencies;
- and
- modulating, by the motor controller, two phases of a first inverter to apply a first output voltage to the first motor that is substantially equivalent to line input voltage when the first commanded motor frequency is within the predetermined range of line input power frequencies.
A hybrid motor system comprising:
- a first motor comprising a run capacitor;
- and
- a motor controller configured to:
- operate a switch device coupled in parallel with said run capacitor, the switch device configured to bypass said run capacitor when a first commanded motor frequency is not within a predetermined range of line input power frequencies;
- and
- modulate two phases of a first inverter to apply a first output voltage to said first motor that is substantially equivalent to line input voltage when the first commanded motor frequency is within the predetermined range of line input power frequencies.
Dependencies are inferred from the claim text.