A method for controlling a braking system of an electromagnetic motor, the electromagnetic motor having a moveable output shaft, comprising the steps of: receiving a velocity signal and/or an acceleration signal based on movement of the output shaft, said velocity signal and/or acceleration signal having a respective frequency spectrum; identifying an event from the velocity and/or the acceleration signal using the respective frequency spectrum, wherein said event corresponds to an uncontrolled movement of the output shaft and has a characteristic frequency spectrum.

A method for controlling a braking system of an electromagnetic motor, the electromagnetic motor having a moveable output shaft, comprising the steps of: receiving a velocity signal and/or an acceleration signal based on movement of the output shaft, said velocity signal and/or acceleration signal having a respective frequency spectrum; identifying an event from the velocity and/or the acceleration signal using the respective frequency spectrum, wherein said event corresponds to an uncontrolled movement of the output shaft and has a characteristic frequency spectrum.

Disclosed are an apparatus and method for controlling auto focus of a camera module including a voice coil motor actuator. The present invention includes a fixed unit having a perforated hole formed therein, a magnet placed inside the fixed unit, a lens unit including at least one lens and configured to linearly move inside the perforated hole of the fixed unit, an Optical Image Stabilizer (OIS) coil placed between the fixed unit and the lens unit to correct destabilization of the lens unit, a moving coil placed on a surface of the lens unit, a fixed coil receiving from the moving coil, a variable current or a variable voltage according to a distance moved by the moving coil, an image signal processing unit processing an image signal sensed by the sensing unit, and a controller configured to provide a signal comprising first frequency signal and second frequency signal to the moving coil, wherein the fixed coil receiving the variable current or the variable voltage through the second frequency signal, calculate a focus position value based on the received variable current or the variable voltage according to a distance moved by the moving coil from the fixed coil and the image signal processed by the image signal processing unit, and control the lens unit to move by applying first frequency signal to the moving coil according to the calculated focus position value, wherein the controller is further configured to receive the second frequency signal only during a specific time slot in order for the second frequency signal to not include noise due to OIS signal and apply the OIS signal to the OIS coil during the rest of a time slot of the second frequency signal.

An exemplary embodiment of the present invention a rotor including a lens and formed with a first driving unit, a stator formed with a second driving unit driving the rotor in response to electromagnetic interaction with the first driving unit, and a base on which the stator is fixed, wherein the rotor is brought into contact with the base, in a case the lens is in a UP posture, and the rotor is distanced from the base, in a case the lens is in a DOWN posture.

An exemplary embodiment of the present invention a rotor including a lens and formed with a first driving unit, a stator formed with a second driving unit driving the rotor in response to electromagnetic interaction with the first driving unit, and a base on which the stator is fixed, wherein the rotor is brought into contact with the base, in a case the lens is in a UP posture, and the rotor is distanced from the base, in a case the lens is in a DOWN posture.

The present technology relates to an imaging device and an electronic device that enable highly accurate adjustment of a focus position and a camera shake correction position. The device includes: a lens that focuses subject light; an imaging element that photoelectrically converts the subject light from the lens; a circuit substrate including a circuit that externally outputs a signal from the imaging element; an actuator that drives the lens with a Pulse Width Modulation (PWM) waveform in at least one of an X-axis direction, a Y-axis direction, or a Z-axis direction; and a detection unit that detects a magnetic field generated by a coil included in the actuator. The actuator drives the lens to move a focus, or drives the lens to reduce an influence of camera shake. The present technology can be applied to the imaging device.

The present technology relates to an imaging device and an electronic device that enable highly accurate adjustment of a focus position and a camera shake correction position. The device includes: a lens that focuses subject light; an imaging element that photoelectrically converts the subject light from the lens; a circuit substrate including a circuit that externally outputs a signal from the imaging element; an actuator that drives the lens with a Pulse Width Modulation (PWM) waveform in at least one of an X-axis direction, a Y-axis direction, or a Z-axis direction; and a detection unit that detects a magnetic field generated by a coil included in the actuator. The actuator drives the lens to move a focus, or drives the lens to reduce an influence of camera shake. The present technology can be applied to the imaging device.

Disclosed herein is a motor driver circuit including a first output terminal to be connected to a first end of a to-be-driven motor via a sense resistor, a second output terminal to be connected to a second end of the motor, an error detector that generates an error signal, an A/D converter that obtains a digital signal, a compensator that generates a voltage command value, a D/A converter that converts the voltage command value to an analog control signal, a pulse width modulator that generates a first pulse and a second pulse, and an output stage that generates a first driving voltage and a second driving voltage. During a first mode, the compensator uses the error signal obtained by the A/D converter at a negative edge timing of the first pulse, for the error signal at a positive edge timing of the second pulse.

Disclosed herein is a motor driver circuit including a first output terminal to be connected to a first end of a to-be-driven motor via a sense resistor, a second output terminal to be connected to a second end of the motor, an error detector that generates an error signal, an A/D converter that obtains a digital signal, a compensator that generates a voltage command value, a D/A converter that converts the voltage command value to an analog control signal, a pulse width modulator that generates a first pulse and a second pulse, and an output stage that generates a first driving voltage and a second driving voltage. During a first mode, the compensator uses the error signal obtained by the A/D converter at a negative edge timing of the first pulse, for the error signal at a positive edge timing of the second pulse.

A flange device using a voice coil motor and a contact control method thereof are disclosed. In the flange device, a force sensor, displacement sensor and an inertial measurement unit (IMU) are used to sense contact data, the contact data is filtered, and the filer contact data is calculated based on an attitude & heading reference systems (AHRS) algorithm, to obtain a force control command to control a displacement direction and a displacement distance of the flange device, so that the flange device is able to adjust a contact status between a polishing device and a to-be-polished object by using the voice coil motor, thereby achieving the technical effect of providing an electromagnetic contact-state adjustment device with quiet and precise control and fast response.