An air conditioner ECU transmits a communication message in a format for controlling a stepper motor. Since a stepper motor and a DC motor are controlled by a communication message in respective predetermined formats, the DC motor cannot be controlled with the communication message transmitted by the air conditioner ECU. Therefore, the sub ECU relays the communication message transmitted by the air conditioner ECU and drives the actuator. The sub ECU converts the communication message transmitted by the air conditioner ECU into control information corresponding to a predetermined format of each actuator and drives each actuator based on the converted control information.

An air conditioner ECU transmits a communication message in a format for controlling a stepper motor. Since a stepper motor and a DC motor are controlled by a communication message in respective predetermined formats, the DC motor cannot be controlled with the communication message transmitted by the air conditioner ECU. Therefore, the sub ECU relays the communication message transmitted by the air conditioner ECU and drives the actuator. The sub ECU converts the communication message transmitted by the air conditioner ECU into control information corresponding to a predetermined format of each actuator and drives each actuator based on the converted control information.

A camera module actuator includes, a magnet, a coil, a driver, and a position estimating processor. The coil is disposed to face the magnet. The driver is configured to move the magnet by applying a driving signal to the coil. The position estimating processor is configured to estimate a position of the magnet from an oscillating signal. A frequency of the oscillating signal varies according to a movement of the magnet.

A soundstage device to generate a random noise signal may include a container to include a virtual assistant. The container may include a base to mount the virtual assistant and a lid to connect to the base; the lid may be movable between a first position and a second position, and the lid may include a random noise generator to generate the random noise signal.

Aspects of the invention provide methods and systems for moving a plurality of moveable stages relative to a stator. The stator comprises a plurality of coils shaped to provide pluralities of coil trace groups where each coil trace group comprises a corresponding plurality of generally linearly elongated coil traces which extend across a stator tile. Each moveable stage comprises a plurality of magnet arrays. Methods and apparatus are provided for moving the moveable stages relative to the stator, where a magnet array from a first moveable stage and a magnet array from a second moveable stage both overlap a shared group of coil traces. For at least a portion of the time that the magnet arrays from the first and second moveable stages overlap the shared group of coil traces, currents are controllably driven in the shared coil trace group based on the positions of both the first and second moveable stages. The positions of the first and second moveable stages may be ascertained by feedback.

Aspects of the invention provide methods and systems for moving a plurality of moveable stages relative to a stator. The stator comprises a plurality of coils shaped to provide pluralities of coil trace groups where each coil trace group comprises a corresponding plurality of generally linearly elongated coil traces which extend across a stator tile. Each moveable stage comprises a plurality of magnet arrays. Methods and apparatus are provided for moving the moveable stages relative to the stator, where a magnet array from a first moveable stage and a magnet array from a second moveable stage both overlap a shared group of coil traces. For at least a portion of the time that the magnet arrays from the first and second moveable stages overlap the shared group of coil traces, currents are controllably driven in the shared coil trace group based on the positions of both the first and second moveable stages. The positions of the first and second moveable stages may be ascertained by feedback.

A motor control circuit (12) capable of performing a high-precision step-out determination under a wide range of conditions. The motor control circuit (12) includes an input voltage measuring unit (125), a temperature measuring unit (128), a back electromotive force measuring unit (126), a determination threshold value setting unit, and a determination unit. The input voltage measuring unit (125) measures an input voltage input to a motor control device (10). The temperature measuring unit (128) measures temperature. The back electromotive force measuring unit (126) measures back electromotive force induced in a coil for which energization is stopped out of the coils of plural phases. The determination threshold value setting unit sets a determination threshold value of back electromotive force based on a measurement result of the input voltage measuring unit (125) and a measurement result of the temperature measuring unit (128), and based on a determination reference value that is preset for each of plural partial areas sectioned in a matrix form with a threshold value relating to the input voltage and a threshold value relating to the temperature. The determination unit makes a determination on step-out of a stepping motor (20) based on a measurement result of the back electromotive force measuring unit (126) and the set determination threshold value of the back electromotive force.

A method for controlling the drive current in a stepper motor includes measuring stepper motor current, computing a load angle of the stepper motor, calculating a torque ratio of the stepper motor, generating a reference current as a function of the torque ratio and a maximum current setting for the stepper motor, and setting the drive current of the stepper motor as a function of the reference current.

A stepper motor driver for mechanical engineering mechanical engineering includes a bottom plate, and a placing slot formed on the upper surface of the bottom plate. Both sides of the inner wall of the placing slot inner wall are fixed by a first sliding rod; two first sliding sleeves are sheathed on a surface of the first sliding rod; two first sliding sleeves are engaged with opposite sides of the two first fixed plates respectively; two first springs are sheathed on the first sliding rod, and both ends of two first springs are fixed to the sides of the two first fixed plates away from each other and both sides of the inner wall of the placing slot respectively. The driver can be removed and replaced conveniently and quickly to achieve the effects of reducing the labor intensity, saving the working time, and improving the efficiency of replacing the driver, with the design of the first fixed plate, first spring, carrier board, third fixed plate, telescopic device and clamping plate.

In accordance with an embodiment, a flywheel includes a rotary shaft which is rotatably provided to the flywheel, a rotor which is fixed to the rotary shaft and rotatable with the rotary shaft, and an unrotatable stator arranged so as to face the rotor. The rotor includes first permanent magnets provided on a first surface facing the stator. The stator includes second permanent magnets which are provided on a second surface facing the rotor in correspondence with the first permanent magnets respectively and have the same polarity as that of the first permanent magnets.