Hybrid drive circuit for variable speed induction motor
First Claim
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1. A motor drive circuit configured to drive a motor, said motor drive circuit comprising:
- a three-phase inverter coupled to the motor and configured to generate a two-phase AC output voltage to drive the motor when a motor commanded frequency is not within a predetermined range of line input power frequencies, said three-phase inverter comprising;
a first phase output coupled to a main winding of the motor;
a second phase output coupled to the main winding and a start winding of the motor; and
a third phase output coupled to a capacitor that is coupled to the start winding; and
a first switch device configured to couple line input power to an output of the inverter to drive the motor using the line input power when the motor commanded frequency is within the predetermined range of line input power frequencies.
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Abstract
Hybrid motor drive circuits configured to drive a motor are provided herein. A hybrid motor drive circuit includes an inverter coupled to the motor and configured to drive the motor when a motor commanded frequency is not within a predetermined range of line input power frequencies. The hybrid motor drive circuit also includes a first switch device configured to couple line input power to an output of the inverter when the motor commanded frequency is within the predetermined range of line input power frequencies.
95 Citations
19 Claims
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1. A motor drive circuit configured to drive a motor, said motor drive circuit comprising:
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a three-phase inverter coupled to the motor and configured to generate a two-phase AC output voltage to drive the motor when a motor commanded frequency is not within a predetermined range of line input power frequencies, said three-phase inverter comprising; a first phase output coupled to a main winding of the motor; a second phase output coupled to the main winding and a start winding of the motor; and a third phase output coupled to a capacitor that is coupled to the start winding; and a first switch device configured to couple line input power to an output of the inverter to drive the motor using the line input power when the motor commanded frequency is within the predetermined range of line input power frequencies. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A motor drive circuit configured to drive a motor, said motor drive circuit comprising:
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a power converter configured to convert alternating current (AC) line input power to direct current (DC) power, the AC line input power received from a power source at an input terminal; a DC link electrically coupled to the rectifier, the DC-link comprising a low-capacitance capacitor having a capacitance less than 100 μ
F;a three-phase inverter coupled downstream from the DC-link and configured to generate a two-phase AC output voltage to drive the motor, said three-phase inverter comprising; a first phase output coupled to a main winding of the motor; a second phase output coupled to the main winding and a start winding of the motor; and a third phase output coupled to a capacitor that is coupled to the start winding; and a controller configured to; operate a switch device configured to bypass a capacitor of the motor when a motor commanded frequency is not within a predetermined range of line input power frequencies; and synchronize two phases of the three-phase inverter to apply an output voltage to the motor that is substantially equivalent to line input voltage when the motor commanded frequency is within the predetermined range of line input power frequencies. - View Dependent Claims (14, 15, 16)
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17. A motor drive circuit configured to drive a motor, said motor drive circuit comprising:
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a bi-directional power converter configured to realize bidirectional power transfer of AC line input power received from a power source and regenerated power from the motor; a three-phase inverter coupled downstream from the bi-directional power converter and configured to generate a two-phase AC output voltage to drive the motor, said three-phase inverter comprising; a first phase output coupled to a main winding of the motor; a second phase output coupled to the main winding and a start winding of the motor; and a third phase output coupled to a capacitor that is coupled to the start winding; and a controller configured to; synchronize multiple outputs of the inverter by providing two inverter phases with the same command; and enable regeneration of power from the motor to the power source when instantaneous power of the motor becomes negative. - View Dependent Claims (18, 19)
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Specification