Driver circuit and method for single-phase and three-phase induction motors
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United States of America Patent
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Jun 13, 2017
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N/A
app pub date -
Oct 26, 2015
filing date -
Oct 26, 2015
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Abstract
A control circuit for an induction motor operates to determine whether the inductor motor is of the three-phase type or single-phase type. If three-phase, a variable frequency drive operation is implemented. If single-phase, a closed loop current control process is implemented. The closed loop current control process includes an operation by the control circuit to measure winding resistances and determine a turns ratio for the main and auxiliary motor windings. The turns ratio is used in the closed loop current control process to scale a measurement of current in the auxiliary winding for the purpose of generating the control voltage for the auxiliary winding. Phase of the current in the windings is further processed to generate a phase control signal.
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