IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0717121
(2010-03-03)
|
등록번호 |
US-8248011
(2012-08-21)
|
우선권정보 |
TW-98140121 A (2009-11-25) |
발명자
/ 주소 |
- Lai, Sung-Ming
- Yang, Chia-Tai
|
출원인 / 주소 |
- Anpec Electronics Corporation
|
대리인 / 주소 |
|
인용정보 |
피인용 횟수 :
3 인용 특허 :
4 |
초록
▼
A method for driving a two-phase brushless motor is disclosed. The motor includes a rotator with permanent magnetism and a stator including a first coil and a second coil. The method includes activating the two-phase brushless motor, detecting an output voltage of a disabled coil of the first coil a
A method for driving a two-phase brushless motor is disclosed. The motor includes a rotator with permanent magnetism and a stator including a first coil and a second coil. The method includes activating the two-phase brushless motor, detecting an output voltage of a disabled coil of the first coil and the second coil to generate a detection result, comparing the detection result and a reference voltage to determine a commutation time point between the first coil and the second coil, generating a commutation signal according to the commutation time point, and driving the two-phase brushless motor according to the commutation time point.
대표청구항
▼
1. A method for driving a two-phase brushless motor comprising a rotator with permanent magnetism and a stator comprising a first coil and a second coil, the method comprising: activating the two-phase brushless motor;detecting an output voltage of a disabled coil of the first coil and the second co
1. A method for driving a two-phase brushless motor comprising a rotator with permanent magnetism and a stator comprising a first coil and a second coil, the method comprising: activating the two-phase brushless motor;detecting an output voltage of a disabled coil of the first coil and the second coil to generate a detection result;comparing the detection result and a reference voltage to determine a commutation time point between the first coil and the second coil;generating a commutation signal according to the commutation time point; anddriving the two-phase brushless motor according to the commutation signal;wherein the step of activating the two-phase brushless motor comprises: generating an activation signal;generating a temporary commutation signal according to the activation signal;respectively and temporarily enabling the first coil and the second coil according to the temporary commutation signal to generate an electromagnetic response signal;determining a starting position of the rotator according to the electromagnetic response signal;generating an activation commutation signal according to the starting position; andsupplying power to the first coil or the second coil according to the activation commutation signal. 2. The method of claim 1, wherein the step of comparing the detection result and the reference voltage to determine the commutation time point between the first coil and the second coil is assigning a time point at which the detection result is equal to the reference voltage to be the commutation time point. 3. The method of claim 1, wherein a voltage level of the commutation signal is varied at the commutation time point. 4. The method of claim 3, wherein the step of driving the two-phase brushless motor according to the commutation signal is enabling the disabled coil and disabling an active coil of the first coil and the second coil when the voltage level of the commutation signal is varied. 5. The method of claim 1, wherein the electromagnetic response signal is a response voltage potential of the disabled coil of the first coil and the second coil. 6. The method of claim 1, wherein the step of determining the starting position of the rotator according to the electromagnetic response signal is determining the starting position according to a decay period of the electromagnetic response signal. 7. The method of claim 1, wherein the step of generating the activation commutation signal according to the starting position is generating the activation commutation signal, such that the rotator starting to rotate from the starting position rotates according to a default rotational direction of the two-phase brushless motor. 8. The method of claim 1 further comprising: determining whether the rotator rotates according to a default rotational direction of the two-phase brushless motor according to the detection result to generate a determination result; andcontrolling the two-phase brushless motor according to the determination result. 9. The method of claim 8, wherein the step of determining whether the rotator rotates according to the default rotational direction of the two-phase brushless motor according to the detection result to generate the determination result comprises: setting up a suspension period after the rotator starts rotating; andstopping generating the commutation signal and determining whether the rotator rotates according to the default rotational direction based on slope variation of the output voltage of the disabled coil indicated by the detection result to generate the determination result during the suspension period. 10. The method of claim 8, wherein the step of controlling the two-phase brushless motor according to the determination result comprises: stopping generating the commutation signal when the determination result indicates that the rotator does not rotate according to the default rotational direction of the two-phase brushless motor to stop rotation of the two-phase brushless motor; andrestarting the rotation of the two-phase brushless motor after the two-phase brushless motor is completely stopped. 11. A driver for driving a two-phase brushless motor comprising a rotator with permanent magnetism and a stator comprising a first coil and a second coil, the driver comprising: an activation unit, coupled to the two-phase brushless motor, for activating the two-phase brushless motor and generating an activation signal to activate the two-phase brushless motor;a detection unit, coupled to the two-phase brushless motor, for detecting an output voltage of a disabled coil of the first coil and the second coil to generate a detection result;a comparison unit, coupled to the detection unit, for comparing the detection result and a reference voltage to determine a commutation time point between the first coil and the second coil;a control unit, coupled to the comparison unit, for generating a commutation signal according to the commutation time point and generating a temporary commutation signal according to the activation signal; anda driving unit, coupled to the control unit, for driving the two-phase brushless motor according to the commutation signal. 12. The driver of claim 11, wherein the comparison unit assigns a time point at which the detection result is equal to the reference voltage to be the commutation time point. 13. The driver of claim 11, wherein the control unit varies a voltage level of the commutation signal at the commutation time point. 14. The driver of claim 13, wherein the driving unit enables the disabled coil and disables an active coil of the first coil and the second coil when the voltage level of the commutation signal is varied. 15. The driver of claim 11, wherein the driving unit is further utilized for respectively and temporarily enabling the first coil and the second coil according to the temporary commutation signal to generate an electromagnetic response signal. 16. The driver of claim 15, wherein the electromagnetic response signal is a response voltage potential of the disabled coil of the first coil and the second coil. 17. The driver of claim 15, wherein the activation unit is further utilized for determining a starting position of the rotator according to the electromagnetic response signal. 18. The driver of claim 17, wherein the activation unit determines the starting position according to a decay period of the electromagnetic response signal. 19. The driver of claim 17, wherein the control unit is further utilized for generating an activation commutation signal according to the starting position. 20. The driver of claim 19, wherein the control unit generates the activation commutation signal, such that the rotator starting to rotate from the starting position rotates according to a default rotational direction of the two-phase brushless motor. 21. The driver of claim 19, wherein the driving unit is further utilized for supplying power to the first coil or the second coil according to the activation commutation signal. 22. The driver of claim 11, further comprising a fault detector, coupled to the detection unit, the comparison unit, the control unit and the activation unit, for determining whether the rotator rotates according to a default rotational direction of the two-phase brushless motor based on the detection result to generate a determination result, and controlling the two-phase brushless motor according to the determination result. 23. The driver of claim 22, wherein the activation unit is further utilized for setting up a suspension period after the rotator starts rotating. 24. The driver of claim 23, wherein the control unit stops generating the commutation signal during the suspension period and determines whether the rotator rotates according to the default rotational direction based on slope variation of the output voltage of the disabled coil indicated by the detection result to generate the determination result. 25. The driver of claim 22, wherein the control unit stops generating the commutation signal when the determination result indicates that the rotator does not rotate according to the default rotational direction of the two-phase brushless motor to stop rotation of the two-phase brushless motor. 26. The driver of claim 25, wherein the activation unit restarts the rotation of the two-phase brushless motor after the two-phase brushless motor is completely stopped.
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