A fan detection chip, a fan detection method and a fan detection system are disclosed. In the fan detection system, a fan includes a power terminal and a speed signal terminal, and optionally includes a PWM signal terminal; a power supply module provides a driving voltage to the fan, a PWM signal generating module provides a first PWM signal and a second PWM signal which respectively have different duty cycles, a current sensing module respectively senses a first current and a second current flowing from the power supply module, and a control module compares the first current and the second current. The control module determines the fan to be a PWM fan when the first current is different from the second current, and the control module determines the fan to be a DC fan when the first current is the same as the second current.

Fan controller (1) for a modular power supply having a fan (13). An output (8) is provided for transmitting control signals to the fan (13) for controlling fan speed. A plurality of sensor modules (20) are associated with a respective module (11, 6, 7) of the modular power supply. Each sensor module (20) includes a temperature detecting circuit comprising a sensor for sensing temperature variations in the respective module (11, 6, 7), a fan control circuit (30) galvanically isolated from the temperature detecting circuit for outputting a control signal to the output (8) for controlling the fan (13), and an optocoupler (10,9) for transferring an output signal from the temperature detecting circuit (20) to the fan control circuit (30) for generating the control signal.

A drive protection method used in a drive circuit of a DC motor having a maximum tolerance value is disclosed to include the steps of providing a drive current for driving the DC motor and a control signal a for controlling the output level of the drive current, providing a maximum signal level corresponding to the maximum tolerance value of said DC motor, comparing the level of the feedback signal of the DC motor and the maximum signal level, and computing the feedback signal to obtain an operation signal when the level of the feedback signal exceeds the maximum signal level and then stopping the output of the control signal when the level of the operation signal reaches a turn-off level.

A method operates a brushed commutator motor of an adjusting drive in a motor vehicle, particularly a window lifter, having a rotor and having a stator. An angular position of the rotor with respect to the stator is determined. The angular position is used to determine a ripple within the torque, which ripple can be expected on the basis of the commutation. The motor current is adapted such that the amplitude of the ripple that can be expected remains below a determined limit value.

A motor control device includes: a communication interface receiving from an external device a control command for defining a target rotation amount and a target rotation speed of the motor; a sensor interface connected with a first rotation angle sensor outputting a first detection signal in every rotation of the motor at a first angle or a second rotation angle sensor outputting a second detection signal in every rotation of the motor at a second angle larger than the first angle; a controller obtaining a measured value of a rotation speed of the motor based on a reception interval of the first or second detection signal, to decide a set value of the rotation speed to bring the measured value close to the target rotation speed; and a drive signal generator generating a drive signal for rotating the motor according to the set value, and outputting the drive signal.

The invention is related to a drive control for driving a dc motor of an electrical household appliance, in particular a hair cutting device such as an electric razor, shaver or epilator, at constant rotational speed.

Disclosed are an evaluation system, an evaluation device, a game machine, and an evaluation method for being able to evaluate a drive motor that drives various movable bodies called an accessory attached to a game machine such as a pachinko game machine. The game machine includes an accessory mechanism and a motor control mechanism that controls the drive motor of the accessory mechanism. The evaluation device is connectable to the game machine. The motor control mechanism controls the drive motor by outputting a control signal based on input from the evaluation device, and the motor control mechanism outputs a rotational position and a rotational speed of the controlled drive motor and the control signal to the evaluation device. The evaluation device evaluates the drive motor based on the input rotational position, rotational speed, and control signal.

In a motor control device, a communication interface receives a control command defining a target rotation amount and a target rotation speed of a motor. A sensor interface receives a detection signal from a rotation angle sensor outputting a detection signal in every rotation of the motor at a predetermined angle. A controller decides a set value of a rotation speed of the motor. A drive signal generator generates and outputs a drive signal for rotating the motor. The controller calculates a difference between the target rotation amount and a total rotation amount of the motor from start of execution of the control command, based on the number of received detection signals, and determines whether an abnormality occurs in operation of the motor based on an update frequency of a minimum value of the difference or a non-update period when the minimum value of the difference is not updated.

A motor control device includes: a communication interface receiving from an external device a control command for defining a target rotation amount and a target rotation speed of the motor; a sensor interface connected with a first rotation angle sensor outputting a first detection signal in every rotation of the motor at a first angle or a second rotation angle sensor outputting a second detection signal in every rotation of the motor at a second angle larger than the first angle; a controller obtaining a measured value of a rotation speed of the motor based on a reception interval of the first or second detection signal, to decide a set value of the rotation speed to bring the measured value close to the target rotation speed; and a drive signal generator generating a drive signal for rotating the motor according to the set value, and outputting the drive signal.

A method operates a brushed commutator motor of an adjusting drive in a motor vehicle, particularly a window lifter, having a rotor and having a stator. An angular position of the rotor with respect to the stator is determined. The angular position is used to determine a ripple within the torque, which ripple can be expected on the basis of the commutation. The motor current is adapted such that the amplitude of the ripple that can be expected remains below a determined limit value.