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
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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.
Claims21
1-16. (canceled)
A motor controller, said motor controller configured to:
- operate a switch device configured to bypass a run capacitor of a first motor 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 configured to bypass a run capacitor of a first motor 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.
The method of claim 46, further comprising receiving, by the motor controller from a current sensor coupled to one of a positive DC-link rail or a negative DC-link rail of the motor controller, a fault signal indicating an excessive current present in at least one of ground or windings of the first motor.
A hybrid motor system comprising:
- a first motor;
- and
- a motor controller configured to:
- operate a switch device configured to bypass a run capacitor of said first motor 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.