Disk drive apparatus and motor

• US 6,600,287 B2
• Filed: 10/26/2001
• Issued: 07/29/2003
• Est. Priority Date: 10/27/2000
• 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): Dang, Khanh
• Application Number:
  US10/016,004
• Publication Number:
  US 20020070696A1
• Time in Patent Office: 641 Days
• Field of Search: 318/138, 318/254, 318/139, 318/599
• US Class Current: 318/599
• CPC Class Codes: G11B 19/2009 Turntables, hubs and motors for disk drives; Mounting of motors in the drive means for clamping of disk to turntable G11B17/022 and subgroups
• CPC Class Codes: G11B 19/28 Speed controlling, regulating, or indicating G11B19/24 takes precedence

Abstract

A disk drive apparatus reproduces a signal from a disk and/or records a signal on the disk. A position detecting part produces a single position signal in response to a rotation of a rotor. An activation operation block controls active periods of first and second power amplifying parts in response to the position signal. A signal producing part produces first and second activation control signals. The activation operation block controls the first and second power amplifying parts responding with the first and second activation control signals. Therefore, an excellent disk drive apparatus with reduced acoustic noise and reduced vibration can be realized by using only one position signal of one position sensor.

Claims

1. 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 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;

Q first power amplifying means, each of said Q first power amplifying means including a first power transistor for forming a current path between one output terminal side of said voltage supplying means and one of said Q-phase windings;

Q second power amplifying means, each of said Q second power amplifying means including a second power transistor for forming a current path between the other output terminal side of said voltage supplying means and one of said Q-phase windings;

position detecting means for producing a position signal which responds with a rotation of said rotor; and

activation operation means for controlling active periods of said Q first power amplifying means and said Q second power amplifying means responding with said position signal of said position detecting means, each of said active periods being larger than the period of 360/Q electrical degrees;

and that

said activation operation means comprises;

time measuring means for measuring a time interval T0 which responds with an interval of said position signal;

first timing means for changing the state of a first state signal at an interval of a first adjust time T1 which responds with said time interval T0 and is less than T0/2, and setting said first state signal substantially to a first predetermined state responding with the measuring operation of said time measuring means;

second timing means for changing the state of a second state signal at an interval of a second adjust time T2 which responds with said time interval T0 and is less than T1/2, and setting said second state signal substantially to a second predetermined state responding with a changing operation of said first state signal; and

signal producing means for producing at least an activation control signal which responds with said first state signal and said second state signal, thereby controlling an active period of at least one power amplifying means among said Q first power amplifying means and said Q second power amplifying means responding with said at least an activation control signal;

and said signal producing means includes;

slope means for producing a slope signal which responds with said second state signal; and

shaping means for producing said at least an activation control signal which responds with said slope signal and said first state signal, said at least an activation control signal varying substantially smoothly in at least one of rising and falling slopes responding with said slope signal.

2. The disk drive apparatus in accordance with claim 1, wherein

said time measuring means measures said time interval T0 which is substantially equal to one period of said position signal,

said first timing means changes the state of said first state signal so that the number of the states of said first state signal in the one period of said position signal is substantially equal to MQ (M is a positive integer), and

said signal producing means produces Q-phase activation control signals which respond with said first state signal and said slope signal.

3. The disk drive apparatus in accordance with claim 1, wherein

said time measuring means measures said time interval T0 which is substantially equal to a half period of said position signal,

said first timing means changes the state of said first state signal so that the number of the states of said first state signal in the half period of said position signal is substantially equal to NQ (N is a positive integer), and

said signal producing means produces Q-phase activation control signals which respond with at least said first state signal and said slope signal.

4. The disk drive apparatus in accordance with claim 1, wherein

said signal producing means produces Q-phase first activation control signals which respond with at least said first state signal and said slope signal so as to control the active periods of said Q first power amplifying means, each of said Q-phase first activation control signals varying substantially smoothly in at least one of rising and falling slopes responding with said slope signal.

5. The disk drive apparatus in accordance with claim 1, wherein

said signal producing means produces Q-phase second activation control signals which respond with at least said first state signal and said slope signal so as to control the active periods of said Q first power amplifying means, each of said Q-phase second activation control signals varying substantially smoothly in at least one of rising and falling slopes responding with said slope signal.

6. The disk drive apparatus in accordance with claim 1, further comprising

commanding means for producing a command signal which responds with a rotational speed of said disk,

said activation control means being adapted to change said at least an activation control signal responding with said command signal.

7. The disk drive apparatus in accordance with claim 1, further comprising

commanding means for producing a command signal which responds with a rotational speed of said disk, and

switching operation means for causing at least one power amplifying means among said Q first power amplifying means and said Q second power amplifying means to perform high-frequency switching responding with said command signal.

8. The disk drive apparatus in accordance with claim 7, wherein

said switching operation means produces a switching pulse signal which responds with said command signal and causes one or two of said Q first power amplifying means to perform high-frequency switching simultaneously responding with said switching pulse signal.

9. The disk drive apparatus in accordance with claim 7, wherein

said switching operation means comprises:

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

switching control means for causing said at least one power amplifying means to perform high-frequency switching responding with said current detection signal and said command signal.

10. The disk drive apparatus in accordance with claim 7, wherein

said switching operation means controls the peak of the composed current to said Q-phase windings from said voltage supplying means responding with said command signal.

11. The disk drive apparatus in accordance with claim 1, wherein

said position detecting means includes a position sensor which detects a field flux of said field part of said rotor so as to produce said position signal.

12. 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 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;

Q first power amplifying means, each of said Q first power amplifying means including a first power transistor for forming a current path between one output terminal side of said voltage supplying means and one of said Q-phase windings;

Q second power amplifying means, each of said Q second power amplifying means including a second power transistor for forming a current path between the other output terminal side of said voltage supplying means and one of said Q-phase windings;

position detecting means for producing a position signal which responds with a rotation of said rotor; and

activation operation means for controlling active periods of said Q first power amplifying means and said Q second power amplifying means responding with said position signal of said position detecting means, each of said active periods being larger than the period of 360/Q electrical degrees;

and that

said activation operation means comprises;

time measuring means for measuring a time interval T0 which responds with an interval of said position signal;

first timing means for changing the state of a first state signal at an interval of a first adjust time T1 which responds with said time interval T0 and is less than T0/2;

second timing means for changing the state of a second state signal at an interval of a second adjust time T2 which responds with said time interval T0 and is less than T1/2; and

signal producing means for producing at least an activation control signal which responds with said first state signal and said second state signal, thereby controlling an active period of at least one power amplifying means among said Q first power amplifying means and said Q second power amplifying means responding with said at least an activation control signal.

13. The disk drive apparatus in accordance with claim 12, wherein

said first timing means sets said first timing signal substantially to a first predetermined state responding with the measuring operation of said time measuring means.

14. The disk drive apparatus in accordance with claim 12, wherein

said second timing means sets said second timing signal substantially to a second predetermined state responding with a changing operation of said first state signal.

15. The disk drive apparatus in accordance with claim 12, wherein

said time measuring means measures said time interval T0 which is substantially equal to one period of said position signal,

said first timing means changes the state of said first state signal so that the number of the states of said first state signal in the one period of said position signal is substantially equal to MQ (M is a positive integer), and

said signal producing means produces Q-phase activation control signals which respond with said first state signal and said second state signal.

16. The disk drive apparatus in accordance with claim 12, wherein

said time measuring means measures said time interval T0 which is substantially equal to a half period of said position signal,

said first timing means changes the state of said first state signal so that the number of the states of said first state signal in the half period of said position signal is substantially equal to NQ (N is a positive integer), and

said signal producing means produces Q-phase activation control signals which respond with at least said first state signal and said second state signal.

17. The disk drive apparatus in accordance with claim 12, wherein

said signal producing means includes:

slope means for producing a slope signal which responds with said second state signal; and

shaping means for producing said at least an activation control signal which responds with said slope signal and said first state signal, said at least an activation control signal varying substantially smoothly in at least one of rising and falling slopes responding with said slope signal.

18. The disk drive apparatus in accordance with claim 12, further comprising

commanding means for producing a command signal which responds with a rotational speed of said disk, and

switching operation means for causing at least one power amplifying means among said Q first power amplifying means and said Q second power amplifying means to perform high-frequency switching responding with said command signal.

19. The disk drive apparatus in accordance with claim 18, wherein

said switching operation means produces a switching pulse signal which responds with said command signal and causes one or two of said Q first power amplifying means to perform high-frequency switching simultaneously responding with said switching pulse signal.

20. The disk drive apparatus in accordance with claim 18, wherein

said switching operation means comprises:

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

switching control means for causing said at least one power amplifying means to perform high-frequency switching responding with said current detection signal and said command signal.

21. 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;

Q first power amplifying means, each of said Q first power amplifying means including a first power transistor for forming a current path between one output terminal side of said voltage supplying means and one of said Q-phase windings;

Q second power amplifying means, each of said Q second power amplifying means including a second power transistor for forming a current path between the other output terminal side of said voltage supplying means and one of said Q-phase windings;

position detecting means for producing a position signal which responds with a rotation of said rotor; and

activation operation means for controlling active periods of said Q first power amplifying means and said Q second power amplifying means responding with said position signal of said position detecting means, each of said active periods being larger than the period of 360/Q electrical degrees;

and that

said activation operation means comprises;

time measuring means for measuring a time interval T0 which responds with an interval of said position signal;

first timing means for changing the state of a first state signal at an interval of a first adjust time T1 which responds with said time interval T0 and is less than T0/2, and setting said first state signal substantially to a first predetermined state responding with the measuring operation of said time measuring means;

second timing means for changing the state of a second state signal at an interval of a second adjust time T2 which responds with said time interval T0 and is less than T1/2, and setting said second state signal substantially to a second predetermined state responding with a changing operation of said first state signal; and

signal producing means for producing at least an activation control signal which responds with said first state signal and said second state signal, thereby controlling an active period of at least one power amplifying means among said Q first power amplifying means and said Q second power amplifying means responding with said at least an activation control signal;

and said signal producing means includes;

slope means for producing a slope signal which responds with said second state signal; and

shaping means for producing said at least an activation control signal which responds with said slope signal and said first state signal, said at least an activation control signal varying substantially smoothly in at least one of rising and falling slopes responding with said slope signal.

22. The motor in accordance with claim 21, wherein

said time measuring means measures said time interval T0 which is substantially equal to one period of said position signal,

said first timing means changes the state of said first state signal so that the number of the states of said first state signal in the one period of said position signal is substantially equal to MQ (M is a positive integer), and

said signal producing means produces Q-phase activation control signals which respond with said first state signal and said slope signal.

23. The motor in accordance with claim 21, wherein

said time measuring means measures said time interval T0 which is substantially equal to a half period of said position signal,

said first timing means changes the state of said first state signal so that the number of the states of said first state signal in the half period of said position signal is substantially equal to NQ (N is a positive integer), and

said signal producing means produces Q-phase activation control signals which respond with at least said first state signal and said slope signal.

24. The motor in accordance with claim 21, wherein

said signal producing means produces Q-phase first activation control signals which respond with at least said first state signal and said slope signal so as to control the active periods of said Q first power amplifying means, each of said Q-phase first activation control signals varying substantially smoothly in at least one of rising and falling slopes responding with said slope signal.

25. The motor in accordance with claim 21, wherein

said signal producing means produces Q-phase second activation control signals which respond with at least said first state signal and said slope signal so as to control the active periods of said Q first power amplifying means, each of said Q-phase second activation control signals varying substantially smoothly in at least one of rising and falling slopes responding with said slope signal.

26. The motor in accordance with claim 21, further comprising

commanding means for producing a command signal which responds with a rotational speed of said disk,

said activation control means being adapted to change said at least an activation control signal responding with said command signal.

27. The motor in accordance with claim 21, further comprising

commanding means for producing a command signal which responds with a rotational speed of said disk, and

switching operation means for causing at least one power amplifying means among said Q first power amplifying means and said Q second power amplifying means to perform high-frequency switching responding with said command signal.

28. The motor in accordance with claim 27, wherein

said switching operation means produces a switching pulse signal which responds with said command signal and causes one or two of said Q first power amplifying means to perform high-frequency switching simultaneously responding with said switching pulse signal.

29. The motor in accordance with claim 27, wherein

said switching operation means comprises:

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

switching control means for causing said at least one power amplifying means to perform high-frequency switching responding with said current detection signal and said command signal.

30. The motor in accordance with claim 27, wherein

said switching operation means controls the peak of the composed current to said Q-phase windings from said voltage supplying means responding with said command signal.

31. The motor in accordance with claim 21, wherein

said position detecting means includes a position sensor which detects a field flux of said field part of said rotor so as to produce said position signal.

32. 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;

Q first power amplifying means, each of said Q first power amplifying means including a first power transistor for forming a current path between one output terminal side of said voltage supplying means and one of said Q-phase windings;

Q second power amplifying means, each of said Q second power amplifying means including a second power transistor for forming a current path between the other output terminal side of said voltage supplying means and one of said Q-phase windings;

position detecting means for producing a position signal which responds with a rotation of said rotor; and

activation operation means for controlling active periods of said Q first power amplifying means and said Q second power amplifying means responding with said position signal of said position detecting means, each of said active periods being larger than the period of 360/Q electrical degrees;

and that

said activation operation means comprises;

time measuring means for measuring a time interval T0 which responds with an interval of said position signal;

first timing means for changing the state of a first state signal at an interval of a first adjust time T1 which responds with said time interval T0 and is less than T0/2;

second timing means for changing the state of a second state signal at an interval of a second adjust time T2 which responds with said time interval T0 and is less than T1/2; and

signal producing means for producing at least an activation control signal which responds with said first state signal and said second state signal, thereby controlling an active period of at least one power amplifying means among said Q first power amplifying means and said Q second power amplifying means responding with said at least an activation control signal.

33. The motor in accordance with claim 32, wherein

said first timing means sets said first timing signal substantially to a first predetermined state responding with the measuring operation of said time measuring means.

34. The motor in accordance with claim 32, wherein

said second timing means sets said second timing signal substantially to a second predetermined state responding with a changing operation of said first state signal.

35. The motor in accordance with claim 32, wherein

said time measuring means measures said time interval T0 which is substantially equal to one period of said position signal,

said first timing means changes the state of said first state signal so that the number of the states of said first state signal in the one period of said position signal is substantially equal to MQ (M is a positive integer), and

said signal producing means produces Q-phase activation control signals which respond with said first state signal and said second state signal.

36. The motor in accordance with claim 32, wherein

said time measuring means measures said time interval T0 which is substantially equal to a half period of said position signal,

said first timing means changes the state of said first state signal so that the number of the states of said first state signal in the half period of said position signal is substantially equal to NQ (N is a positive integer), and

said signal producing means produces Q-phase activation control signals which respond with at least said first state signal and said second state signal.

37. The motor in accordance with claim 32, wherein

said signal producing means includes:

slope means for producing a slope signal which responds with said second state signal; and

shaping means for producing said at least an activation control signal which responds with said slope signal and said first state signal, said at least an activation control signal varying substantially smoothly in at least one of rising and falling slopes responding with said slope signal.

38. The motor in accordance with claim 32, further comprising

commanding means for producing a command signal which responds with a rotational speed of said disk, and

switching operation means for causing at least one power amplifying means among said Q first power amplifying means and said Q second power amplifying means to perform high-frequency switching responding with said command signal.

39. The motor in accordance with claim 38, wherein

said switching operation means produces a switching pulse signal which responds with said command signal and causes one or two of said Q first power amplifying means to perform high-frequency switching simultaneously responding with said switching pulse signal.

40. The motor in accordance with claim 38, wherein

said switching operation means comprises:

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

switching control means for causing said at least one power amplifying means to perform high-frequency switching responding with said current detection signal and said command signal.