Fan device with improved speed control module and plural fan system constructed thereby
AssigneeSunonwealth Electric Machine Industry Co., Ltd.
InventorsAlex Horng, Chun-Yuan Huang, Chung-Ken Cheng
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Abstract
A fan device with improved speed control module includes a stator, a rotor, and a speed control module. The stator has a driving unit outputting currents for the stator to generate alternative magnetic fields and thus turn the rotor. The speed control module includes a control unit and a speed adjusting circuit, with the control unit generating a control command for the driving unit and further outputting a state signal for the speed adjusting circuit to control whether a PWM signal enters the control circuit or not.
Claims18
A fan device with improved speed control module, comprising:
- a stator having a magnetizing member with a plurality of coils, and a driving unit electrically connecting with the coils;
- a rotor having a shaft with an end rotatably coupling to the stator, an impeller fixed to another end of the shaft, and an annular magnet mounted to an inner periphery of the impeller and facing the magnetizing member;
- and
- a speed control module having a control unit and a speed adjusting circuit, with the control unit providing a signal input port connecting to a pulse width modulation signal terminal, a signal output port connecting to the speed adjusting circuit, and a command output port connecting with the driving unit, with the speed adjusting circuit connecting between the signal output port and the pulse width modulation signal terminal,
- wherein the pulse width modulation signal terminal is for receiving a pulse width modulation signal, and the control unit sends a command signal to the driving unit and generates a state signal for the speed adjusting circuit to determine whether the pulse width modulation signal enters the control unit or not.
Dependencies are inferred from the claim text.