Disclosed is a clothes treating apparatus and a control method thereof. Specifically, the clothes treating apparatus may include an inverter configured to convert a direct current (DC) input into an alternating current (AC) output and provide the AC output to the motor, and a controller configured to control the inverter in relation to driving of the motor.

Disclosed is a clothes treating apparatus and a control method thereof. Specifically, the clothes treating apparatus may include an inverter configured to convert a direct current (DC) input into an alternating current (AC) output and provide the AC output to the motor, and a controller configured to control the inverter in relation to driving of the motor.

Disclosed is a clothes treating apparatus and a control method thereof. Specifically, the clothes treating apparatus may include an inverter configured to convert a direct current (DC) input into an alternating current (AC) output and provide the AC output to the motor, and a controller configured to control the inverter in relation to driving of the motor.

One aspect of a position estimation method of the present invention includes: a learning step of acquiring learning data necessary for estimation of a rotational position of a rotor on the basis of an input sensor signal; and a position estimation step of estimating the rotational position of the rotor on the basis of the input sensor signal and the learning data. The learning step is performed, thereby acquiring, as the learning data, data indicating the correspondence relationship between a segment number associated with a section included in each of a plurality of quadrants and a pole pair number representing a pole pair position. The position estimation step is performed, thereby determining an initial position of the rotor on the basis of the input sensor signal and the learning data.

A method for operating a variable speed drive for driving an electric motor, in particular a synchronous motor, includes calculating a look-up table for a given motor, said look-up table having torque input values and flux input values referenced to current magnitude values and current angle values at the max torque per amp (MTPA) points and at increasing angular deviations from the MTPA points, wherein the current magnitude values and current angle values are out-put signals for controlling the motor; and outputting current magnitude values and current angle values as a function of torque input values and/or flux input values at the max torque per amp (MTPA) point to the motor as control variables, if the associated flux values are smaller than or equal to a flux limit; or outputting current magnitude values and current angle values as control variables, such that the associated flux values do not exceed a flux limit. The disclosure further discloses a variable speed drive for executing the method.

A method for operating a variable speed drive for driving an electric motor, in particular a synchronous motor, includes calculating a look-up table for a given motor, said look-up table having torque input values and flux input values referenced to current magnitude values and current angle values at the max torque per amp (MTPA) points and at increasing angular deviations from the MTPA points, wherein the current magnitude values and current angle values are out-put signals for controlling the motor; and outputting current magnitude values and current angle values as a function of torque input values and/or flux input values at the max torque per amp (MTPA) point to the motor as control variables, if the associated flux values are smaller than or equal to a flux limit; or outputting current magnitude values and current angle values as control variables, such that the associated flux values do not exceed a flux limit. The disclosure further discloses a variable speed drive for executing the method.

With a driving current as I.sub.DRV, with a reference voltage as V.sub.REF, and with a gain as k, a current detection circuit generates a detection voltage V.sub.S represented by V.sub.S=V.sub.REF+kI.sub.DRV. An error amplifier amplifies a difference between the detection voltage V.sub.S and a control voltage that indicates a position of the VCM so as to generate an error voltage V.sub.ERR. A first driver switches the driving current I.sub.DRV between a source current and a sink current with respect to one end of the coil according to the error voltage V.sub.ERR. A second driver switches the driving current I.sub.DRV between a sink current and a source current with respect to the other end of the coil according to the error voltage V.sub.ERR. The driving circuit allows an external circuit to set the level of the reference voltage V.sub.REF.

A camera module having a voice coil motor driver, including a driving controller configured to compare a reference voltage and a negative feedback voltage to output a driving control signal, and a driver configured to drive a coil of the voice coil motor according to the driving control signal.

A camera module having a voice coil motor driver, including a driving controller configured to compare a reference voltage and a negative feedback voltage to output a driving control signal, and a driver configured to drive a coil of the voice coil motor according to the driving control signal.

A device or method for stabilizing a voice coil is disclosed. The device comprises a voice coil for providing a motive force, and means for measuring a signal from said voice coil related to a motional electromotive force. The device further comprises a unit for controlling an amplification of said signal to create a force in said voice coil in a direction of said motional electromotive force.