Multi-phase brushless direct-current motor and drive method therefor

1. A multi-phase brushless direct current motor, comprising a motor body, a driving module and a digital controller;

said driving module comprising a plurality of phase coil windings each of which has two ends;

the driving module further comprising a plurality of H-bridge unipolar inverters, each of which represents each phase of the multi-phase for the motor;

said digital controller including a plurality of output terminals;

wherein each of the H-bridge unipolar inverters further comprises two output ends adapted to electrically connect with said two ends of a respective one of the plurality of phase coil windings, such that the plurality of phase coil windings are arranged to operate independently without a common connection point;

wherein one or more of the output terminals of the controller are arranged to electrically connect with respective control legs of each of the plurality of H-bridge unipolar inverters, with an output signal of the controller being pulse width-modulated sine waves, and said pulse width-modulated sine waves being adapted to drive respective ones of the plurality of H-bridge unipolar inverters;

wherein the pulse width-modulated sine waves are of identical frequency and amplitude;

wherein each respective one of said plurality of phase coil windings is independent one to another; with the pulse width-modulated sine waves corresponding to every two adjacent phase coil windings having a non-zero phase difference, and phase differences of the plurality of phase coil windings are identical.

2. The multi-phase brushless direct current motor according to claim 1 , wherein said plurality of phase coil windings comprise at least one of: two phase coil windings, three phase coil windings, and phase coil windings in a number being a multiple of two or three.

3. The multi-phase brushless direct current motor according to claim 1 , wherein the digital controller is a field-programmable gate array controller.

4. The multi-phase brushless direct current motor according to claim 3 , wherein the field-programmable gate array controller comprises at least one of an analog and a digital circuit.

5. The multi-phase brushless direct current motor according to claim 1 , wherein the plurality of phase coil windings are arranged in parallel without a common connection point.

6. A driving method for a multi-phase brushless direct current motor, the multiphase brushless direct current motor comprising a driving module comprising a plurality of phase coil windings each of which has two ends, the driving module further comprising a plurality of H-bridge unipolar inverters, each of which represents each phase of the multi-phase for the motor, wherein each of the H-bridge unipolar inverters further comprises two output ends adapted to electrically connect with said two ends of a respective one of the plurality of phase coil windings, such that the plurality of phase coil windings are arranged to operate independently without a common connection point; the method comprising step of:

outputting pulse width-modulated signals with identical frequency and amplitude from a controller to thereby drive respective ones of the plurality of H-bridge unipolar inverters for each phase;

wherein the driving method further comprises the steps of:

outputting pulse width-modulated sine waves with identical frequency and amplitude from the controller to thereby drive respective ones of the plurality of H-bridge unipolar inverters for each phase; wherein the pulse width-modulated sine waves correspond to every two adjacent phase coil windings having a non-zero phase difference, and phase differences of the plurality of phase coil windings are identical; and

outputting sine wave driving voltages or sine wave driving currents in their corresponding phases from the respective ones of the plurality of H-bridge unipolar inverters to the corresponding, electrically connected phase coil windings.

7. The driving method for a multi-phase brushless direct current motor according to claim 6 , wherein each of the plurality of H-bridge unipolar inverters for each respective phase is adapted to operate in a unipolar mode.

8. The driving method for a multi-phase brushless direct current motor according to claim 6 , wherein said plurality of phase coil windings comprise at least one of: two phase coil windings, three phase coil windings, and phase coil windings in a number being a multiple of two or three.

9. The driving method for a multi-phase brushless direct current motor according to claim 6 , wherein the plurality of phase coil windings are arranged in parallel without a common connection point.

10. A three-phase brushless direct current motor, comprising:

a motor body, a driving module and a digital controller;

said driving module comprising three phase coil windings each of which has two ends;

the driving module further comprising three H-bridge unipolar inverters, each of which represents respective ones of the three phases of the three-phase motor;

said digital controller including six output terminals;

wherein each of the three H-bridge unipolar inverters further comprises two output ends adapted to electrically connect with said two ends of a respective one of the three phase coil windings, such that the three phase coil windings are arranged to operate independently without a common connection point;

wherein the output terminals of the controller are arranged to electrically connect with respective control legs of each of the three H-bridge unipolar inverters, with an output signal of the controller being pulse width-modulated sine waves, and said pulse width-modulated sine waves being adapted to drive respective ones of the three H-bridge unipolar inverters;

wherein the pulse width-modulated sine waves are of identical frequency and amplitude;

wherein each respective one of said three phase coil windings is independent one to another; with the pulse width-modulated sine waves corresponding to every two adjacent phase coil windings having a non-zero phase difference, and phase differences of the three phase coil windings being identical.

11. The three-phase brushless direct current motor according to claim 10 , wherein the three phase coil windings are arranged in parallel without a common connection point.