초록 ▼

A driving apparatus for a DC brushless motor of a ceiling fan is provided. By setting at least one coder and one sensor outside the DC brushless motor, the driving apparatus can sense the position of magnetic poles of the motor for driving the motor. Meanwhile, a controller set with the motor stores

A driving apparatus for a DC brushless motor of a ceiling fan is provided. By setting at least one coder and one sensor outside the DC brushless motor, the driving apparatus can sense the position of magnetic poles of the motor for driving the motor. Meanwhile, a controller set with the motor stores the rotation speed of the motor before being turned off by detecting the turn-off time of a turn-on/off signal.

대표청구항 ▼

What is claimed is: 1. An driving apparatus for being applied in a ceiling fan, the ceiling fan comprising a direct current (DC) brushless motor, an axle, and a controller, the driving apparatus being configured between the DC brushless motor and the controller and being electrically connected to t

What is claimed is: 1. An driving apparatus for being applied in a ceiling fan, the ceiling fan comprising a direct current (DC) brushless motor, an axle, and a controller, the driving apparatus being configured between the DC brushless motor and the controller and being electrically connected to the controller, the DC brushless motor comprising a stator and at least one pair of magnetic poles, the driving apparatus comprising: a supporting element, being connected to the DC brushless motor via the axle; at least one coder, each of the at least one coder being set on the shell of the DC brushless motor corresponding to the position of the at least one pair of magnetic poles, each of the at least one coder having a lateral dimension and synchronously rotating with the DC brushless motor; at least one sensor being electrically connected to the controller, the at least one sensor being set on the supporting element corresponding to the position of the stator and between the supporting element and the shell of the DC brushless motor, the at least one sensor being configured to sense the motion of the at least one coder; wherein each of the at least one sensor generates at least one output signal in response to the lateral dimension of the at least one coder, the controller controls operation of the DC brushless motor according to the at least one output signal. 2. The driving apparatus as claimed in claim 1, wherein the at least one sensor comprises an invisible spectrum interceptor, and the at least one coder comprises an intercepting coder. 3. The driving apparatus as claimed in claim 1, wherein the at least one sensor comprises an infrared rays interceptor. 4. The driving apparatus as claimed in claim 1, wherein: number of the at least one pair of the magnetic poles is plural; number of the at least one coder is plural, each of the coders comprises different lateral dimension from each other and is set in response to the positions of the plurality of pairs of the magnetic poles; and each of the at least one sensor senses the lateral dimensions of the coders to generate a plurality of output signals with different pulse widths, and the controller controls operation of the DC brushless motor according to the output signals. 5. The driving apparatus as claimed in claim 4, wherein the number of the coders is equal to the number of the pairs of the magnetic poles. 6. The driving apparatus as claimed in claim 1, wherein each one of the coders comprises a plurality of sub-coders, in which each of the sub-coders has equal lateral dimension. 7. The driving apparatus as claimed in claim 6, wherein the sub-coders are arranged in different intervals. 8. The driving apparatus as claimed in claim 1, wherein the controller further comprises a control circuit and a drive circuit, the DC brushless motor comprises a plurality of rotation speeds, wherein: the control circuit receives a turn-on/-off signal and generates a control signal; and the drive circuit receives the control signal and generates a drive signal to control the rotation speeds of the DC brushless motor. 9. The driving apparatus as claimed in claim 8, wherein the controller further comprises a memory module, when the turn-off duration of the turn-on/-off signal exceeds a reference, the control circuit generates a rotation speed signal and saves the rotation speed signal to the memory module, the rotation speed signal represents the rotation speed when the DC brushless motor is turned-off. 10. The driving apparatus as claimed in claim 1, wherein the controller further comprises a protection circuit being configured to receive a load signal relative to the rotating load of the DC brushless motor, and to generate a protection signal, the control circuit then controls the operation of the DC brushless motor according to the protection signal. 11. The driving apparatus as claimed in claim 10, wherein the protection circuit further comprises: a current sensor, being configured to transfer the load signal into a voltage signal; a filter, being configured to filter the voltage signal and generate a filtered voltage signal; and a comparator, being configured to compare the filtered voltage signal with a first reference and generate the protection signal. 12. The driving apparatus as claimed in claim 11, wherein when the filtered voltage signal exceeds the first reference, the protection signal is adapted to decrease the rotation speed of the DC brushless motor. 13. The driving apparatus as claimed in claim 12, wherein when the filtered voltage signal that exceeds the first reference returns to be lower than the first reference, the protection signal is adapted to increase the rotation speed of the DC brushless motor. 14. The driving apparatus as claimed in claim 12, wherein the comparator is further configured to receive a second reference, when the filtered voltage signal exceeds the second reference, the protection signal is adapted to turn off the DC brushless motor. 15. The driving apparatus as claimed in claim 11, wherein when the filtered voltage signal exceeds the first reference, the protection signal is adapted to turn off the DC brushless motor. 16. The driving apparatus as claimed in claim 10, wherein the load signal is relative to a working temperature of the DC brushless motor.