Sensorless induction motor system and control method thereof
AssigneesHyundai Motor Company, Kia Corporation
InventorsSung Do KIM, Chang Seok YOU, Hyo Jeong LEE, Min Su KANG, Joo Yeon KIM
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Abstract
A sensorless induction motor system includes a control unit which applies a plurality of sampling pulse voltages to phases of the stator, estimates the position of a rotor through a first rotor position vector having the greatest deviation in an induced current, compares an induced current deviation of a second rotor position vector having a second greatest deviation of deviation of the induced current with that of a first rotor position vector, and determines whether or not permanent magnets are demagnetized; and a method of controlling the sensorless induction motor system.
Claims16
A sensorless induction motor system comprising:
- an electric motor including a stator having windings forming a plurality of phases and a rotor having permanent magnets;
- and
- a control unit configured to control driving of the electric motor by controlling a voltage applied in each phase of the stator, to apply a plurality of sampling pulse voltages to the phases of the stator, to estimate a position of the rotor through a first rotor position vector having deviation of an induced current, to compare induced current deviation of a second rotor position vector having a second greatest deviation of the induced current with induced current deviation of the first rotor position vector, and to determine whether or not the permanent magnets are demagnetized.
A method of controlling a sensorless induction motor system including an electric motor, which includes a stator having windings forming a plurality of phases and a rotor having permanent magnets, and a control unit for controlling driving of the electric motor by controlling a voltage applied to the stator in each phase thereof, the method comprising:
- applying, by the control unit, a plurality of sampling pulse voltages to the stator in respective phases thereof, and estimating a position of the rotor through a first rotor position vector;
- and
- comparing, by the control unit, an induced current deviation of a second rotor position vector having a second greatest deviation of the induced current with an induced current deviation of the first rotor position vector, and determining whether or not the permanent magnets are demagnetized.
Dependencies are inferred from the claim text.