MOTOR CONTROL METHOD AND APPARATUS THEREOF

• US 20080292290A1
• Filed: 04/28/2008
• Published: 11/27/2008
• Est. Priority Date: 05/25/2007
• Status: Active Grant

• Current Assignee: Delta Electronics Incorporated
• Original Assignee: Delta Electronics Incorporated
• Inventors: Chiu, Chun-Lung, Chiu, Chin-Fa, Tsai, Ming-Shi
• Granted Patent: US 7,994,746 B2
• Time in Patent Office: Days
• US Class Current: 388/811
• CPC Class Codes: H02P 23/04 specially adapted for damping motor oscillations, e.g. for reducing hunting
• CPC Class Codes: Y02P 80/10 Efficient use of energy, e.g. using compressed air or pressurized fluid as energy carrier

Abstract

A motor controlling method and apparatus thereof are provided. The control method includes the steps of receiving a switching phase signal of coil while the motor is rotating, for generating a separate signal, comparing the phase signal and the separate signal to generate a first control signal, generating a current feedback signal equivalent to the first control signal, and comparing the current feedback signal and the separate signal for generating a second control signal so as to control the operation of the motor.

Claims

1. A motor control method, comprising steps of:

receiving a phase signal with a phase identical to a switching phase signal of a coil set while a motor is operating;

generating a separate signal;

comparing the phase signal with the separate signal to generate a first control signal;

receiving a current feedback signal equivalent to the first control signal; and

comparing the current feedback signal with the separate signal for generating a second control signal to control the operation of the motor.

2. The motor control method of claim 1, wherein the phase signal is generated by a phase sampling circuit by detecting the phase switched by the coil set during the rotation of the motor.

3. The motor control method of claim 1, wherein the separate signal is received from a separate signal generating circuit.

4. The motor control method of claim 1, wherein the separate signal comprises a plurality of continuous and uniform-distributing signals, and the separate signal is a triangular, sine, trapezoid, or polygonal wave.

5. The motor control method of claim 1, wherein the current feedback signal is received by a current sampling circuit, by detecting a current signal on a coil switching circuit when the first control signal is input to the coil switching circuit.

6. The motor control method of claim 1, wherein the first control signal within a predetermined phase range comprises a plurality of rectangular waves, the width of the rectangular waves closer to the center of the predetermined phase range is wider than the width of the rectangular waves far from the center of the predetermined phase range.

7. The motor control method of claim 1, wherein the second control signal within a predetermined phase range comprises a plurality of rectangular waves, the width of the rectangular waves corresponding to lower amplitude of the current feedback signal is wider than the width of the rectangular waves corresponding to higher amplitude of the current feedback signal.

8. A motor control apparatus, comprising:

a phase sampling circuit, provided to detect a phase switching signal generated while a motor is rotating, and output a corresponding phase signal;

a separate signal generating circuit, provided to generate a separate signal and output the separate signal;

a first comparison circuit, electrically coupled to the phase sampling circuit and the separate signal generating circuit, provided to compare the phase signal with the separate signal to generate a first control signal and output the first control signal;

a motor driver, electrically coupled to the phase sampling circuit and the first comparison circuit, and the motor driver provided to receive the first control signal from the first comparison circuit to process the first control signal, and output the processed first control signal;

a coil switching circuit, electrically coupled to the motor driver, the coil switching circuit provided to receive the processed first control signal from the motor driver, and switch the phase of the motor according to the processed first control signal;

a current sampling circuit, electrically coupled to the coil switching circuit, the current sampling circuit provided to receive a current feedback signal equivalent to the first control signal from the coil switching circuit and output the current feedback signal; and

a second comparison circuit, electrically coupled to the current sampling circuit, the separate signal generating circuit, and the motor driver, the second comparison circuit provided to compare the current feedback signal with the separate signal to generate a second control signal, and output the second control signal to the motor driver, thereby driving the coil switching circuit to control the operation of the motor.

9. The motor control apparatus of claim 8, wherein the first comparison circuit outputs a high level signal when the phase signal is higher than the separate signal, and the first comparison circuit outputs a low level signal when the phase signal is lower than the separate signal.

10. The motor control apparatus of claim 8, wherein the second comparison circuit outputs a high level signal when the separate signal is higher than the current feedback signal, and the second comparison circuit outputs a low level signal when the separate signal is lower than the current feedback signal.

11. The motor control apparatus of claim 8, further comprising a first amplifier electrically coupled to the phase sampling circuit and the first comparison circuit, wherein the first amplifier is provided to receive and amplify the phase signal to output to the first comparison circuit.

12. The motor control apparatus of claim 8, further comprising a second amplifier electrically coupled to the phase sampling circuit and the second comparison circuit, wherein the second amplifier is provided to receive and amplify the current feedback signal output by the current sampling circuit to output to the second comparison circuit.

13. The motor control apparatus of claim 8, further comprising a pulse width modulator electrically coupled to the motor driver, wherein the pulse width modulator is provided to modulate the first control signal and second control signal received by the motor driver to change a rotational speed of the motor.

14. A motor control apparatus, comprising:

a phase sampling circuit, provided to detect a phase switching signal generated while a motor is rotating, and output a corresponding phase signal;

a coil switching circuit; and

a programmable integrated circuit, electrically coupled to the phase sampling circuit and the coil switching circuit, the programmable integrated circuit provided to receive the phase signal, generate a separate signal, compare the phase signal with the separate signal to generate a first control signal to output to the coil switching circuit, receive a current feedback signal equivalent to the first control signal from the coil switching circuit, and compare the current feedback signal with the separate signal to generate a second control signal to output to the coil switching circuit, thereby controlling the operation of the motor.

15. The motor control apparatus of claim 14, wherein the phase sampling circuit is a Hall sensor.

16. The motor control apparatus of claim 14, wherein the separate signal comprises a plurality of continuous and uniform-distributed signals, and the separate signal is a triangular, sine, trapezoid, or polygonal wave.

17. The motor control apparatus of claim 14, wherein the first control signal within a predetermined phase range comprises of a plurality of rectangular waves, and the width of the rectangular waves close to the center of the predetermined phase range is wider than the width of the rectangular waves far from the center of the predetermined phase range.

18. The motor control apparatus of claim 14, wherein the second control signal within a predetermined phase range comprises of a plurality of rectangular waves, and the width of the rectangular waves corresponding to lower amplitude of the current feedback signal is wider than the width of the rectangular waves corresponding to higher amplitude of the current feedback signal.

19. The motor control apparatus of claim 14, further comprising a motor driver, electrically coupled to the programmable integrated circuit and the coil switching circuit, wherein the motor driver is provided to receive the first and second control signals output by the programmable integrated circuit and drive the coil switching circuit to control the rotation of the motor via the first and second control signal.

20. The motor control apparatus of claim 14, further comprising a pulse width modulator electrically coupled to the programmable integrated circuit, wherein the pulse width modulator is provided to modulate the first control signal and second control signal to change a rotational speed of the motor.