Method and system for compensating offset of resolver
AssigneesHyundai Motor Company, Kia Motors Corporation
InventorsJae Sang LIM, Joo Young Park, Gu Bae Kang, Young Un Kim
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Abstract
A method and a system for compensating an offset of a resolver, may include sampling an output signal of the resolver at a predetermined sampling frequency, comparing magnitudes of the sampled output signals of the resolver, when a difference in magnitude between the sampled output signals of the resolver is greater than a predetermined reference value, controlling the motor by a random pulse width modulation (RPWM) scheme in which switching frequencies of the switching elements in the inverter are arbitrarily changed, and compensating an offset of the resolver coupled to the motor while controlling the motor with the RPWM scheme.
Claims10
A method for compensating an offset of a resolver, the method comprising:
- sampling, by a controller, an output signal of the resolver at a predetermined sampling frequency;
- comparing, by the controller, magnitudes of the sampled output signals of the resolver;
- when a difference between the magnitudes of the sampled output signals of the resolver is greater than a predetermined reference value, controlling, by the controller, a motor with a random pulse width modulation (RPWM) scheme for arbitrarily changing a switching frequency of a switching element in an inverter connected to the motor;
- and
- compensating an offset of the resolver coupled to the motor while controlling the motor with the RPWM scheme.
A system for compensating an offset of a resolver, which provides an output signal for determining a rotation angle of a motor driven by receiving alternating-current (AC) power converted by switching of a switching element in an inverter connected to the motor, the system comprising:
- a sampler configured to sample an output signal of the resolver at a predetermined sampling frequency;
- a modulation scheme determiner configured to compare magnitudes of the sampled output signals of the resolver, and when a difference between the magnitudes of the sampled output signals of the resolver is greater than a predetermined reference value, control the motor with a random pulse width modulation (RPWM) scheme for arbitrarily changing a switching frequency of the switching element in the inverter;
- and
- a resolver offset calculator configured to determine the offset of the resolver on a basis of the output signal of the resolver while driving the motor with a modulation scheme determined by the modulation scheme determiner.
Dependencies are inferred from the claim text.