Johnson Electric International Ag

Johnson Electric S.a.

Kwok Kuen Tse

Rui Feng Qin

Xin Hui Guan

Jian Dong

Ji Yu Liang

Shu Hai Yuan

Kai Xu

En Hui Wang

Long Yu

Tao Qu

Zhong Wan

Ji Xiang Gao

Hai Gan

Qiu Yang Zhang

Bao Yi Xu

A cooling fan module for a heat exchanger or the like, has a motor, a fan driven by the motor and a speed controller connected between the motor and a power supply. The speed controller is configured to operate the motor in a high speed mode and a low speed mode. The speed controller includes a high speed branch and a low speed branch connected in parallel. The low speed branch includes a pulse width modulation circuit configured to reduce an average voltage by a fixed duty ratio to achieve a low speed operation of the motor. By eliminating the conventional voltage dropping resistor, the speed controller reduces the power consumption, thus increasing the efficiency of the module, in the low speed mode of operation.

Cooling fan module

A fan and a motor drive device thereof are provided. The motor drive device is configured to drive a motor and includes a control management unit and a voltage converter. The control management unit classifies target rotation speed signals provided by an ECU into multiple rotation speed ranges, each corresponding to a specific output duty ratio. The control management unit receives a target rotation speed signal transmitted from the ECU in a real-time manner, and output a voltage regulating signal, which is a pulse width modulation signal having a duty ratio corresponding to one of the rotation speed ranges in which the target rotation speed signal transmitted from the ECU falls. The voltage converter is connected between a power source and the motor, and is configured to regulate a voltage outputted to the motor in response to the voltage regulating signal having the specific duty ratio outputted from the control management unit, to regulate a rotation speed of the motor.

Fan and motor drive device thereof

A brush assembly for a brush motor includes a support member, brush holders, at least four brushes respectively mounted to the brush holders, and first and second motor terminals for connecting with an external power supply. A first filter circuit is connected between the first motor terminal and corresponding first brushes. A second filter circuit is connected between the second motor terminal and corresponding second brushes. The first and second motor terminals and the first and second filter circuits are mounted in a region defined by two corresponding adjacent brushes forming an angle greater than 60 degrees but less than 180 degrees.

Brush assembly

A fan and a motor thereof are provided. The motor includes a motor drive device. The motor drive device includes a printed circuit board. A control management unit and a voltage converter are arranged on the printed circuit board, the control management unit classifies target rotation speed signals provided by an ECU into multiple rotation speed intervals, with each rotation speed interval corresponding to a fixed duty ratio. The control management unit receives a target rotation speed signal transmitted from the ECU in a real-time manner, and outputs a pulse width modulation signal having a duty ratio corresponding to the rotation speed interval to which the target rotation speed signal transmitted from the ECU belongs. The voltage converter is connected between the power source and the winding, and is configured to regulate a voltage outputted to the winding in response to the pulse width modulation signal having the fixed duty ratio outputted from the control management unit, to control a rotation speed of the motor. The motor drive device performs segment control on the rotation speed of the motor, thereby reducing the cost.

Motor and fan having motor

A drive circuit for a hair clipper comprises an electric motor and a control circuit for operating the motor at a constant speed regardless of load conditions. The control circuit has detector means for sensing the supply voltage to the clipper and the clipper current, processor means for generating an error signal indicative of a change in supply voltage needed to maintain a constant motor speed and driver means responsive to the error signal for adjusting the supply voltage to the motor to maintain the speed constant.

Drive circuit for a hair clipper

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Hong Kong, China

Kwok Kuen Tse