Motor controller, washing machine, and motor control method

Details Motor controller, washing machine, and motor control method Motor controller, washing machine, and motor control method

2008-03-24

2010-10-12

Ro, Bentsu (Department: 2837)

Electricity: motive power systems

Synchronous motor systems

Brushless motor closed-loop control

C318S400020, C318S610000, C318S722000, C388S906000

Reexamination Certificate

active

07812557

ABSTRACT:
A motor controller includes an output voltage modulator that outputs sinusoidally-modulated voltage for driving a motor; a modulation factor specifier allowing specification of a modulation factor greater than 1.0 for the output voltage; a current detector that detects current flowing in the motor; and a field-oriented controller that divides the current detected by the current detector into a d-axis current component and a q-axis current component and that conforms each of the components to a command current produced based on a command rotational speed; a rotational position estimator that estimates motor rotational speed and rotor rotational position for use by the field-oriented controller; wherein the position estimator includes a filter that smoothes a d-axis induced voltage obtained during the estimation, and the motor rotational speed and the rotor rotational position are estimated based on the d-axis induced voltage smoothed by the filter.

REFERENCES:
patent: 5569995 (1996-10-01), Kusaka et al.
patent: 7489099 (2009-02-01), Fujiwara et al.
patent: 7504784 (2009-03-01), Asada et al.
patent: 7667426 (2010-02-01), Jeong et al.
patent: 2007/0043528 (2007-02-01), Bae
patent: 2005-160183 (2005-06-01), None
Chinese Office action for 200810109339 dated Apr. 14, 2010.

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