Disk drive apparatus and motor

• US 6,680,593 B2
• Filed: 02/28/2002
• Issued: 01/20/2004
• Est. Priority Date: 03/02/2001
• Status: Expired due to Fees

• Current Assignee: Matsushita Electric Industrial Company Limited (Panasonic Holdings Corporation)
• Original Assignee: Matsushita Electric Industrial Company Limited (Panasonic Holdings Corporation)
• Inventors: Gotou, Makoto
• Primary Examiner(s): Nappi, Robert
• Assistant Examiner(s): MCCLOUD, RENATA D
• Application Number:
  US10/087,635
• Publication Number:
  US 20020121871A1
• Time in Patent Office: 691 Days
• Field of Search: 318/254, 318/138, 318/34, 318/439, 318/37, 318/74, 318/95, 363/34
• US Class Current: 318/400.04
• CPC Class Codes: G11B 19/28 Speed controlling, regulating, or indicating G11B19/24 takes precedence
• CPC Class Codes: H02P 23/186 of one shaft by controlling the prime mover

Abstract

Power transistors of a power supplying part execute high-frequency switching operation and form current paths to three-phase windings so as to rotate the disk. A voltage detecting part produces a detected pulse signal responding with terminal voltages of the three-phase windings. An activation operation part controls active periods of the power transistors in response to the detected signal. A phase detecting part includes a slant producing part and a phase pulse producing part. The slant producing part produces a slant voltage signal which intermittently responds with a voltage difference between one of the power supplying terminal voltages and the common terminal voltage of the three-phase windings and has a voltage slant. The phase pulse producing part produces a phase pulse signal by comparing the slant voltage signal with a reference voltage. A commanding part produces a command signal which responds with the phase pulse signal. A switching operation block causes at least one of the power transistors to perform high-frequency switching responding with the command signal.

Claims

1. A motor comprising:

a rotor having a field part which generates field fluxes;

Q-phase windings (Q is an integer of 3 or more);

voltage supplying means, including two output terminals, for supplying a DC voltage;

power supplying means having Q first power transistors and Q second power transistors, each of said Q first power transistors forming a current path between a first output terminal side of said voltage supplying means and one of said Q-phase windings, and each of said Q second power transistors forming a current path between a second output terminal side of said voltage supplying means and one of said Q-phase windings;

voltage detecting means for producing a detected pulse signal which responds to terminal voltages of said Q-phase windings;

phase detecting means for producing a phase pulse signal which responds to terminal voltages of said Q-phase windings;

state shifting means for shifting a holding state from one state to at least one other state in sequence responding to said detected pulse signal of said voltage detecting means;

activation control means for controlling active periods of said Q first power transistors and said Q second power transistors responding to said holding state of said state shifting means;

commanding means for producing a command signal which responds to said phase pulse signal of said phase detecting means; and

switching operation means for causing at least one power transistor among said Q first power transistors and said Q second power transistors to perform high-frequency switching responding to said command signal;

wherein

said activation control means causes each of said active periods of said Q first power transistors and said Q second power transistors to become larger than the period of 360/Q electrical degrees,

said switching operation means produces a high-frequency switching pulse signal which responds to said command signal and switches said at least one power transistor responding to said switching pulse signal, and said phase detecting means includes;

slant producing means for producing a slant voltage signal at a terminal of n capacitor, said slant voltage signal responding intermittently to a voltage difference between one of the power supplying terminal voltages and the common terminal voltage of said Q-phase windings during sampling periods and having a voltage slant during at least one rest period except said sampling periods, and

phase pulse producing means for producing said phase pulse signal by comparing said slant voltage signal to a reference voltage.

2. The motor in accordance with claim 1, wherein said slant producing means selects one of the power supplying terminal voltages in accordance with the operation of said stare shifting means, and produces said slant voltage which intermittently responds to the voltage difference between the selected power supplying terminal voltage and the common terminal voltage.

3. The motor in accordance wit claim 1, wherein said slant producing means includes:

said capacitor, sampling means for intermittently obtaining a sampled voltage at the terminal of said capacitor, said sampled voltage responding to the voltage difference between one of the power supplying terminal voltages and the common terminal voltage during said sampling periods, and

charging means for charging said capacitor with a current so as to produce said voltage slant.

4. The motor in accordance with claim 1, wherein said switching operation means includes:

current detecting means for producing a current detection signal which responds to or corresponds to a composed current to said Q-phase windings from said voltage supplying means, and

switching control means for producing said switching pulse signal which responds to said current detection signal and said command signal.

5. The motor in accordance with claim 1, wherein

said state shifting means shifts said bolding state from a first state to a second state after a first adjust rime from detection of said detected pulse signal, and further shifts said holding state from said second state to a third state after a second adjust time from detection of said detected pulse signal, said second adjust time being larger than said first adjust time.

6. The motor in accordance with claim 5, wherein said state shifting means produces said first adjust rime and said second adjust time proportional to an interval of said detected pulse signal.

7. The motor in accordance with claim 1, wherein said phase detecting means obtains said common terminal voltage of said Q-phase windings by comprising the power supplying terminal voltages of said Q-phase windings.

8. A motor comprising:

a rotor having a field pan which generates field fluxes;

Q-phase windings (Q is an integer of 3 or more);

voltage supplying means, including two output terminals, for supplying a DC voltage;

power supplying means having Q first power transistors and Q second power transistors, each of said Q first power transistors forming a current path between a first output terminal side of said voltage supplying means and one of said Q-phase windings, and each of said Q second power transistors forming a current path between a second output terminal side of said voltage supplying means and one of said Q-phase windings;

phase detecting means for producing a phase pulse signal which responds to terminal voltages of said Q-phase windings;

state shifting means for shifting a holding state from one state to at least one other state in sequence responding to said phase pulse signal of said phase detecting means;

activation control means for controlling active periods of said Q first power transistors and said Q second power transistors responding to said holding state of sail state shifting means;

commanding means for producing a command signal which responds to said phase pulse signal of said phase detecting means; and

switching operation means for causing at least one power transistor among said Q first power transistors and said Q second power transistors to perform high-frequency switching responding to said command signal;

wherein

said activation control means causes each of said active periods of said Q first power transistors and said Q second power transistors to become larger than the period of 360/Q electrical degrees,

said switching operation means produces a high-frequency switching pulse signal which responds to said command signal and switches said at least one power transistor responding to said switching pulse signal, and

said phase detecting means includes;

slant producing means for producing a slant voltage signal at a terminal of a capacitor, said slant voltage signal responding intermittently to a voltage difference between one of the power supplying terminal voltages and the common terminal voltage of said Q-phase windings during sampling periods and having a voltage slant during at least one of rest period except said sampling periods, and

phase pulse producing means for producing said phase pulse signal by comparing said slant voltage signal to a reference voltage.

9. The motor in accordance with claim 8, wherein said slant producing means selects one of the power supplying terminal voltages in accordance with the operation of said state shifting means, and produces said slant voltage which intermittently responds to the voltage difference between the selected power supplying terminal voltage and the common terminal voltage.

10. The motor in accordance with claim 8, wherein said slant producing means includes:

said capacitor,

sampling means for intermittently obtaining a sampled voltage at the terminal of said capacitor, said sampled voltage responding to the voltage difference between one of the power supplying terminal voltages and the common terminal voltage during said sampling periods, and

charging means for charging said capacitor with a current so as to produce said voltage slant.

11. The motor in accordance with claim 8, wherein said switching operation means includes:

current detecting means for producing a current detection signal which responds to or corresponds to a composed current to said Q-phase windings from said voltage supplying means, and

switching control means for producing said switching pulse signal which responds to said current detection signal and said command signal.

12. The motor in accordance with claim 8, where said state shifting means shifts said holding state from a first state to a second state after a first adjust time from detection of said detected pulse signal, and further shifts said holding state from said second state to a third state after a second adjust time from detection of said detected pulse signal, said second adjust time being larger than said first adjust time.

13. The motor in accordance with claim 12, wherein said state shifting means produces said first adjust time and said second adjust time proportional to an interval of said detected pulse signal.

14. The motor in accordance with claim 8, wherein said phase detecting means obtains said common terminal voltage of said Q-phase windings by composing the power supplying terminal voltages of said Q-phase windings.

15. A motor comprising:

a rotor having a field part which generates field fluxes;

Q-phase windings (Q is an integer of 3 or more);

voltage supplying means, including two output terminals, for supplying a DC voltage;

power supplying means having plural power transistors, said plural power transistors supplying said Q-phase windings with bi-directional currents from said voltage supplying means;

phase detecting means for producing a phase pulse signal which responds to terminal voltages of said Q-phase windings;

activation operation means for controlling active periods of said plural power transistors responding to terminal voltages of said Q-phase windings;

commanding means for producing a command signal which responds to said phase pulse signal of said phase detecting means; and

switching operation means for causing at least one power transistor among said plural power transistors to perform high-frequency switching responding to said command signal;

wherein

said activation operation means causes each of said active periods of said plural power transistors to become larger than the period of 360/Q electrical degrees,

said switching operation means produces a high-frequency switching pulse signal which responds to said command signal and switches said at least one power transistor responding to said switching pulse signal, and

said phase detecting means includes;

slant producing means for producing a slant voltage signal at a terminal of a capacitor, said slant voltage signal responding intermittently to a voltage difference between one of the power supplying terminal voltages and the common terminal voltage of said Q-phase windings during sampling periods and having a voltage slant during at least one rest period except said sampling periods, and

phase pulse producing means for producing said phase pulse signal responding to said slant voltage signal.

16. The motor in accordance with claim 15, wherein said slant producing means includes:

said capacitor,

sampling means for intermittently obtaining a sampled voltage at the terminal of said capacitor, said sampled voltage responding to the voltage difference between one of the power supplying terminal voltages and the common terminal voltage during said sampling periods, and

charging means for charging said capacitor with a current so as to produce said voltage slant.

17. The motor in accordance with claim 15, wherein said switching operation means includes:

current detecting means for producing a current detection signal which responds to or corresponds to a composed current to said Q-phase windings from said voltage supplying means, and

switching control means for producing said switching pulse signal which responds to said current detection signal and said command signal.

18. A motor comprising:

a rotor having a field part which generates field fluxes;

Q-phase windings (Q is an integer of 3 or more);

voltage supplying means, including two output terminals, for supplying a DC voltage;

power supplying means having plural power transistors, said plural power transistors supplying said Q-phase windings with bi-directional currents from said voltage supplying means;

phase detecting means for producing a phase pulse signal which responds to terminal voltages of said Q-phase windings;

activation operation means for controlling active periods of said plural power transistors responding to terminal voltages of said Q-phase windings;

commanding means for producing a command signal which responds to said phase pulse signal of said phase detecting means; and

switching operation means for causing at least one power transistor among said plural power transistors to perform high-frequency switching responding to said command signal;

wherein

said activation operation means causes each of said active periods of said plural power transistors to become larger than the period of 360/Q electrical degrees,

said switching operation means produces a high-frequency switching pulse signal which responds to said command signal and switches said at least one power transistor responding said switching pulse signal, and

said phase detecting means includes;

slant producing means for producing a first voltage signal at a terminal of a first capacitor which intermittently responds to one of the power supplying terminal voltages of said Q-phase winding means, and producing a second voltage signal at a terminal of a second capacitor which intermittently responds to the common terminal voltage of said Q-phase windings during sampling periods and has a voltage slant during at least one rest period except said sampling periods, and

phase pulse producing means for producing said phase pulse signal by comparing said first voltage signal to said second voltage signal.

19. The motor in accordance with claim 18, when in said slant producing means includes:

capacitor means having said first capacitor and said second capacitor,

first sampling means for obtaining a first sampled voltage as said first voltage signal at the terminal of said first capacitor, said first sampled voltage intermittently responding to one of the power supplying terminal voltages of said Q-phase windings,

second sampling means for obtaining a second sampled voltage at the terminal of said second capacitor, said second sampled voltage intermittently responding to the common terminal voltage of said Q-phase windings, and

charging means for charging said second capacitor with a current so as to produce said voltage slant of said second voltage signal.

20. The motor in accordance with claim 18, wherein said switching operation means includes:

current detecting means for producing a current detection signal which responds to or corresponds to a composed current to said Q-phase windings from said voltage supplying means, and

switching control means for producing said switching pulse signal which responds to said current detection signal and said command signal.

21. A disk drive apparatus comprising:

head means for at least reproducing a signal from a disk or recording a signal on said disk;

processing means for at least processing an output signal from said head means and outputting a reproduced signal, or processing a signal and outputting a recording signal into said head means,

a rotor, having a field part which generates field fluxes, for driving directly said disk;

Q-phase windings (Q is an integer of 3 or more);

voltage supplying means, including two output terminals, for supplying a DC voltage;

power supplying means having Q first power transistors and Q second power transistors, each of said Q first power transistors forming a current path between a first output terminal side of said voltage supplying means and one of said Q-phase windings, and each of said Q second power transistors forming a current path between a second output terminal side of said voltage supplying means and one of said Q-phase windings;

voltage detecting means for producing a detected pulse signal which responds to terminal voltages of said Q-phase windings;

phase detecting means for producing a phase pulse signal which responds to terminal voltages of said Q-phase windings;

state shifting means for shifting a holding state from one state to at least one other state in sequence responding to said detected pulse signal of said voltage detecting means;

activation control means for controlling active periods of said Q first power transistors and said Q second power transistors responding to said holding state of said state shifting means;

commanding means for producing a command signal which responds to said phase pulse signal of said phase detecting means; and

switching operation means for causing at least one power transistor among said Q first power transistors and said Q second power transistors to perform high-frequency switching responding to said command signal;

wherein

said activation control means causes each of said active periods of said Q first power transistors and said Q second power transistors to become larger than the period of 360/Q electrical degrees,

said switching operation means produces a high-frequency switching pulse signal which responds to said command signal and switches said at least one power transistor responding said switching pulse signal, and

said phase detecting means includes;

slant producing means for producing a slant voltage signal at a terminal of a capacitor, said slant voltage signal responding intermittently to a voltage difference between one of the power supplying terminal voltages and the common terminal voltage of said Q-phase windings during sampling periods and having a voltage slant during at least one rest period except said sampling periods, and

phase pulse producing means for producing said phase pulse signal by comparing said slant voltage signal to a reference voltage.

22. The disk drive apparatus in accordance with claim 21, wherein said slant producing means selects one of the power supplying terminal voltages in accordance with the operation of said state shifting means, and produces said slant voltage which intermittently responds to the voltage difference between the selected power supplying terminal voltage and the common terminal voltage.

23. The disk drive apparatus in accordance with claim 21, wherein

said slant producing means includes:

said capacitor,

sampling means for intermittently obtaining a sampled voltage at the terminal of said capacitor, said sampled voltage responding to the voltage difference between one of the power supplying terminal voltages and the common terminal voltage during said sampling periods, and

charging means for charging said capacitor with a current so as to produce said voltage slant.

24. The disk drive apparatus in accordance with claim 21, wherein

said switching operation means includes:

current detecting means for producing a current detection signal which responds to or corresponds to a composed current to said Q-phase windings from said voltage supplying means, and

switching control means for producing said switching pulse signal which responds to said current detection signal and said command signal.

25. The disk drive apparatus in accordance with claim 21, wherein said state shifting means shifts said holding state from a first state to a second state after a first adjust time from detection of said detected pulse signal, and further shifts said holding state from said second state to a third state after a second adjust time from detection of said detected pulse signal, said second adjust time being larger than said first adjust time.

26. The disk drive apparatus in accordance with claim 25, wherein said state shifting means produces said first adjust time and said second adjust time proportional to an interval of said detected pulse signal.

27. The disk drive apparatus in accordance with claim 21 wherein said phase detecting means obtains said common terminal voltage of said Q-phase windings by composing the power supplying terminal voltages of said Q-phase windings.

28. A disk chive apparatus comprising:

head means for at least reproducing a signal from a disk or recording a signal on said disk;

processing means for at least processing an output signal from said head means and outputting a reproduced signal, or processing a signal and outputting a recording signal into said head means;

a rotor, having a field part which generates field fluxes, for driving directly said disk;

Q-phase windings (Q is an integer of 3 or more);

voltage supplying means, including two output terminals, for supplying a DC voltage;

power supplying means having Q first power transistors and Q second power transistors, each of said Q first power transistors forming a current path between a first output terminal side of said voltage supplying means and one of said Q-phase windings, and each of said Q second power transistors forming a current path between a second output terminal side of said voltage supplying means and one of said Q-phase windings;

phase detecting means for producing a phase pulse signal which responds to terminal voltages of said Q-phase windings;

state shifting means for shifting a holding state from one state to at least one other state in sequence responding to said phase pulse signal of said phase detecting means;

activation control means for controlling active periods of said Q first power transistors and said Q second power transistors responding to said holding state of said state shifting means;

commanding means for producing a command signal which responds to said phase pulse signal of said phase detecting means; and

switching operation means for causing at least one power transistor among said Q first power transistors and said Q second power transistors to perform high-frequency switching responding to said command signal;

wherein

said activation control means causes each of said active periods of said Q first power transistors and said Q second power transistors to become larger than the period of 360/Q electrical degrees,

said switching operation means produces a high-frequency switching pulse signal which responds to said command signal and switches said at least one power transistor responding to said switching pulse signal, and

said phase detecting means includes;

slant producing means for producing a slant voltage signal at a terminal of a capacitor, said slant voltage signal responding intermittently to a voltage difference between one of the power supplying terminal voltages and the common terminal voltage of said Q-phase windings during sampling periods and having a voltage slant during at least one rest period except said sampling periods, and

phase pulse producing means for producing said phase pulse signal by comparing said slant voltage signal to a reference voltage.

29. The disk drive apparatus in accordance with claim 28, wherein

said slant producing means selects one of the power supplying terminal voltages in accordance with the operation of said state shifting means, and produces said slant voltage which intermittently responds to the voltage difference between the selected power supplying terminal voltage and the common terminal voltage.

30. The disk drive apparatus in accordance with claim 28, wherein said slant producing means includes:

said capacitor,

sampling means for intermittently obtaining a sampled voltage at the terminal of said capacitor, said sampled voltage responding to the voltage difference between one of the power supplying terminal voltages and the common terminal voltage during said sampling periods, and

charging means for charging said capacitor with a current so as to produce said voltage slant.

31. The disk drive apparatus in accordance with claim 28, wherein said switching operation means includes:

current detecting means for producing a current detection signal which responds to or corresponds to a composed current to said Q-phase windings from said voltage supplying means, and

switching control means for producing said switching pulse signal which responds to said current detection signal and said command signal.

32. The disk drive apparatus in accordance with claim 28, wherein said state shifting means shifts said holding state from a first state to a second state after a first adjust time from detection of said detected pulse signal, and further shifts said holding state from said second state to a third state after a second adjust time from detection of said detected pulse signal, said second adjust time being larger than said first adjust time.

33. The disk drive apparatus in accordance with claim 32, wherein said state shifting means produces said first adjust time and said second adjust time proportional to an interval of said detected pulse signal.

34. The disk drive apparatus in accordance with claim 28, wherein said phase detecting means obtains said common terminal voltage of said Q-phase windings by composing the power supplying terminal voltages of said Q-phase windings.

35. A disk drive apparatus comprising:

head means for at least reproducing a signal from a disk or recording a signal on said disk;

processing means for at least processing an output signal from said head means and outputting a reproduced signal, or processing a signal and outputting a recording signal into said head means;

a rotor, having a field part which generates field fluxes, for driving directly said disk;

Q-phase windings (Q is an integer of 3 or more);

voltage supplying means, including two output terminals, for supplying a DC voltage;

power supplying means having plural power transistors, said plural power transistors supplying said Q-phase windings bi-directional currents from said voltage supplying means;

phase detecting means for producing a phase pulse signal which responds to terminal voltages of said Q-phase windings;

activation operation means for controlling active periods of said plural power transistors responding to terminal voltages of said Q-phase windings;

commanding means for producing a command signal which responds to said phase pulse signal of said phase detecting means; and

switching operation means for causing at least one power transistor among said plural power transistors to perform high-frequency switching responding to said command signal;

wherein

said activation operation means causes each of said active periods of said plural power transistors to become larger than the period of 360/Q electrical degrees,

said switching operation means produces a high-frequency switching pulse signal which responds to said command signal and switches said at least one power transistor responding said switching pulse signal, and

said phase detecting means includes;

slant producing means for producing a slant voltage signal at a terminal of a capacitor, said slant voltage signal responding intermittently to a voltage difference between one of the power supplying terminal voltages and the common terminal voltage of said Q-phase windings during sampling periods and having a voltage slant during at least one rest period except said sampling periods, and

phase pulse producing means for producing said phase pulse signal responding to said slant voltage signal.

36. The disk drive apparatus in accordance with claim 35, wherein said slant producing means includes:

said capacitor,

sampling means for intermittently obtaining a sampled voltage at the terminal of said capacitor, said sampled voltage responding to the voltage difference between one of the power supplying terminal voltages and the common terminal voltage during said sampling periods, and

charging means for charging said capacitor with a current so as to produce said voltage slant.

37. The disk drive apparatus in accordance with claim 35, wherein said switching operation means includes:

current detecting means for producing a current detection signal which responds to or corresponds to a composed current to said Q-phase windings from said voltage supplying means, and

switching control means for producing said switching pulse signal which responds to said current detection signal and said command signal.

38. A disk drive apparatus comprising:

head means for at least reproducing a signal from a disk or recording a signal on said disk;

processing means for at least processing an output signal from said head means and outputting a reproduced signal, or processing a signal and outputting a recording signal into said head means;

a rotor, having a field part which generates field fluxes, for driving directly said disk;

Q-phase windings (Q is an integer of 3 or more);

voltage supplying means, including two output terminals, for supplying a DC voltage;

power supplying means having plural power transistors, said plural power transistors supplying said Q-phase windings bi-directional currents from said voltage supplying means;

phase detecting means for producing a phase pulse signal which responds to terminal voltages of said Q-phase windings;

activation operation means for controlling active periods of said plural power transistors responding to terminal voltages of said Q-phase windings;

commanding means for producing a command signal which responds to said phase pulse signal of said phase detecting means; and

switching operation means for causing at least one power transistor among said plural power transistors to perform high-frequency switching responding said command signal;

wherein

said activation operation means causes each of said active periods of said plural power transistors to become larger than the period of 360/Q electrical degrees,

said switching operation means produces a high-frequency switching pulse signal which responds to said command signal and switches said at least one power transistor responding to said switching pulse signal, and

said phase detecting means includes;

slant producing means for producing a first voltage signal at a terminal of a first capacitor which intermittently responds to one of the power supplying terminal voltages of said Q-phase winding means, and producing a second voltage signal at a terminal of a second capacitor which intermittently responds to the common terminal voltage of said Q-phase windings during sampling periods and has a voltage slant during at least one rest period except said sampling periods, and

phase pulse producing means for producing said phase pulse signal by comparing said first voltage signal with said second voltage signal.

39. The disk drive apparatus in accordance with claim 38, wherein said slant producing means includes:

capacitor means having said first capacitor and said second capacitor,

first sampling means for obtaining a first sampled voltage as said first voltage signal at the terminal of said first capacitor, said first sampled voltage intermittently responding to one of the power supplying terminal voltages of said Q-phase windings,

second sampling means for obtaining a second sampled voltage at the terminal of said second capacitors said second sampled voltage intermittently responding to the common terminal voltage of said Q-phase windings, and

charging means for charging said second capacitor with a current so as to produce said voltage slant of said second voltage signal.

40. The disk drive apparatus in accordance wit claim 38, wherein said switching operation means includes:

current detecting means for producing a current detection signal which responds or corresponds to a composed current to said Q-phase windings from said voltage supplying means, and

switching control means for producing said switching pulse signal which responds to said current detection signal and said command signal.