Motor with electronic distributing configuration

• US 5,982,118 A
• Filed: 07/27/1998
• Issued: 11/09/1999
• Est. Priority Date: 08/06/1997
• 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, Ochi, Masaaki
• Primary Examiner(s): Masih, Karen
• Application Number:
  US09/123,164
• Time in Patent Office: 470 Days
• Field of Search: 318/254, 318/293, 318/599, 318/281, 318/287, 318/288, 318/289, 363/34
• US Class Current: 318/400.17
• CPC Class Codes: H02P 6/085 in a bridge configuration

Abstract

First FET power transistors of first power amplifying parts and second FET power transistors of second power amplifying parts form current paths from a DC power source to three-phase windings. Three-phase first amplified current signals varying smoothly in rising and falling slopes are supplied to conduction control terminal sides of the first power amplifying parts. Three-phase second amplified current signals varying smoothly in rising and falling slopes are supplied to conduction control terminal sides of the second power amplifying parts. A switching control part performs simultaneous on-off switching of the conduction control terminal sides of the first power amplifying parts, thereby causing first FET power transistors of the first power amplifying parts to perform high-frequency on-off switching. As a result, three-phase drive currents to the windings vary smoothly, thereby reducing motor vibration. And also, power loss of the FET power transistors is reduced remarkably, thereby improving power efficiency of a motor.

Claims

1. A motor comprising:

a movable member;

plural-phase windings;

voltage supplying means for supplying a DC voltage,

Q pieces (Q is an integer of 3 or more) of first power amplifying means each including a first FET power transistor for forming a current path between a negative terminal side of said voltage supplying means and one of said plural-phase windings;

Q pieces of second power amplifying means each including a second FET power transistor for forming a current path between a positive terminal side of said voltage supplying means and one of said plural-phase windings;

altering signal producing means for producing plural-phase altering signals;

first distribution control means for controlling said Q pieces of first power amplifying means responding with output signals of said altering signal producing means;

second distribution control means for controlling said Q pieces of second power amplifying means responding with output signals of said altering signal producing means; and

switching operation means for causing at least one piece of said Q pieces of first power amplifying means and said Q pieces of second power amplifying means to perform high-frequency switching,

and that

said first distribution control means and said second distribution control means include means for supplying at least a current signal, varying smoothly or substantially smoothly at least in rising and/or falling slopes to a conduction control terminal side of at least one piece of said Q pieces of first power amplifying means and said Q pieces of second power amplifying means.

2. The motor in accordance with claim 1, wherein

said first distribution control means includes means for supplying first Q-phase current signals, each varying smoothly or substantially smoothly at least in rising and/or falling slopes, to a conduction control terminal side of each of said Q pieces of first power amplifying means.

3. The motor in accordance with claim 1, wherein

said second distribution control means includes means for supplying second Q-phase current signals, each varying smoothly or substantially smoothly at least in rising and/or falling slopes, to a conduction control terminal side of each of said Q pieces of second power amplifying means.

4. The motor in accordance with claim 1, wherein

said first distribution control means and said second distribution control means includes means for varying at least a slope of said current signal corresponding to a command signal which commands a supply power to said plural-phase windings.

5. The motor in accordance with claim 1, wherein

said switching operation means includes current detecting means for obtaining a current detected signal corresponding to a composed supply current to said plural-phase windings and switching control means for comparing an output signal of said current detecting means with a command signal, thereby causing at least either said Q pieces of first power amplifying means or said Q pieces of second power amplifying means to perform off-operation simultaneously responding with a comparison result.

6. The motor in accordance with claim 1, wherein

said switching operation means include switching control means for causing at least either said Q pieces of first power amplifying means or said Q pieces of second power amplifying means to perform switching operation at their conduction control terminal sides responding with a single pulse signal.

7. The motor in accordance with claim 1, wherein

said switching operation means include switching control means for causing said Q pieces of first power amplifying means to perform switching operation at their conduction control terminal sides responding with a single pulse signal.

8. The motor in accordance with claim 1, wherein

said first distribution control means and said second distribution control means include auxiliary supply means for supplying at least an auxiliary signal to a conduction control terminal side of at least one piece of said Q pieces of first power amplifying means and said Q pieces of second power amplifying means.

9. The motor in accordance with claim 8, wherein

said auxiliary signal has an active electrical angle equal or substantially equal to 360/Q degrees.

10. The motor in accordance with claim 1, wherein

said first distribution control means includes auxiliary supply means for supplying first Q-phase auxiliary signals to the conduction control terminal sides of said Q pieces of first power amplifying means.

11. The motor in accordance with claim 1, wherein

said second distribution control means includes auxiliary supply means for supplying second Q-phase auxiliary signals to the conduction control terminal sides of said Q pieces of second power amplifying means.

12. The motor in accordance with claim 1, wherein

at least one piece of said Q pieces of first power amplifying means and said Q pieces of second power amplifying means includes means for performing current amplifying operation of an input current to the conduction control terminal side.

13. The motor in accordance with claim 1, wherein

at least one piece of said Q pieces of first power amplifying means and said Q pieces of second power amplifying means includes an FET power current-mirror circuit having an FET power transistor, thereby performing current amplifying operation of an input current to the conduction control terminal side.

14. The motor in accordance with claim 1, wherein

said current signals are configured to have an active electrical angle of 150 degrees or more.

15. A motor comprising:

a movable member;

plural-phase windings;

voltage supplying means for supplying a DC voltage,

Q pieces (Q is an integer of 3 or more) of first power amplifying means each including a first FET power transistor for forming a current path between one output terminal side of said voltage supplying means and one of said plural-phase windings;

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

altering signal producing means for producing plural-phase altering signals;

first distribution control means for controlling said Q pieces of first power amplifying means responding with output signals of said altering signal producing means;

second distribution control means for controlling said Q pieces of second power amplifying means responding with output signals of said altering signal producing means; and

switching operation means for causing at least one piece of said first power amplifying means to perform high-frequency switching,

and that

said first distribution control means includes means for supplying Q-phase current signals, each varying smoothly or substantially smoothly at least in rising and/or falling slopes, to a conduction control terminal side of each of said Q pieces of first power amplifying means.

16. The motor in accordance with claim 15, wherein

said first distribution control means includes means for varying at least a slope of said Q-phase current signals corresponding to a command signal which commands a supply power to said plural-phase windings.

17. A motor comprising:

a movable member;

plural-phase windings;

voltage supplying means for supplying a DC voltage,

Q pieces (Q is an integer of 3 or more) of first power amplifying means each including a first FET power transistor for forming a current path between one output terminal side of said voltage supplying means and one of said plural-phase windings;

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

altering signal producing means for producing plural-phase altering signals;

first distribution control means for controlling said Q pieces of first power amplifying means responding with output signals of said altering signal producing means;

second distribution control means for controlling said Q pieces of second power amplifying means responding with output signals of said altering signal producing means; and

switching operation means for causing at least one piece of said first power amplifying means to perform high-frequency switching,

and that

said second distribution control means includes means for supplying Q-phase current signals, each varying smoothly or substantially smoothly at least in rising and/or falling slopes, to a conduction control terminal side of each of said Q pieces of second power amplifying means.

18. The motor in accordance with claim 17, wherein

said second distribution control means includes means for varying at least a slope of said Q-phase current signals corresponding to a command signal which commands a supply power to said plural-phase windings.

19. A motor comprising:

a movable member;

plural-phase windings;

voltage supplying means for supplying a DC voltage;

Q pieces (Q is an integer of 3 or more) of first power amplifying means each including a first FET power transistor for forming a current path between one output terminal side of said voltage supplying means and one of said plural-phase windings, and for amplifying an input current to the conduction control terminal side;

Q pieces of second power amplifying means each including a second FET power transistor for forming a current path between the other output terminal side of said voltage supplying means and one of said plural-phase windings, and for amplifying an input current to the conduction control terminal side;

first distribution control means for supplying first Q-phase current signals, each having an active electrical angle larger than 360/Q degrees, to a conduction control terminal side of each of said Q pieces of first power amplifying means;

second distribution control means for supplying second Q-phase current signals, each having an active electrical angle larger than 360/Q degrees, to a conduction control terminal side of each of said Q pieces of second power amplifying means; and

switching operation means for causing at least either said Q pieces of first power amplifying means or said Q pieces of second power amplifying means to perform high-frequency switching.

20. The motor in accordance with claim 19, wherein

said first distribution control means includes means for supplying said first Q-phase current signals varying smoothly or substantially smoothly at least in rising and/or falling slopes to the conduction control terminal sides of said Q pieces of first power amplifying means, and

said second distribution control means includes means for supplying said second Q-phase current signals varying smoothly or substantially smoothly at least in rising and/or falling slopes to the conduction control terminal sides of said Q pieces of second power amplifying means.

21. The motor in accordance with claim 19, wherein

said first distribution control means and said second distribution control means include means for varying at least some part of said first Q-phase current signals or said second Q-phase current signals corresponding to a command signal which commands a supply power to said plural-phase windings.

22. The motor in accordance with claim 19, wherein

said first distribution control means and said second distribution control means include auxiliary supply means for supplying at least an auxiliary signal to a conduction control terminal side of at least one piece of said Q pieces of first power amplifying means and said Q pieces of second power amplifying means.

23. A motor comprising:

a movable member;

plural-phase windings;

voltage supplying means for supplying DC voltages,

Q pieces (Q is an integer of 3 or more) of first power amplifying means each including a first FET power transistor for forming a current path between one output terminal side of said voltage supplying means and one of said plural-phase windings;

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

altering signal producing means for producing plural-phase altering signals;

first distribution control means for controlling said Q pieces of first power amplifying means responding with output signals of said altering signal producing means;

second distribution control means for controlling said Q pieces of second power amplifying means responding with output signals of said altering signal producing means; and

switching operation means for causing at least one piece of said Q pieces of first power amplifying means and said Q pieces of second power amplifying means to perform high-frequency switching,

and that

at least one piece of power amplifying means performing high-frequency switching by means of said switching operation means is configured so as to include an FET power current-mirror circuit having said FET power transistor thereby amplifying an input current to the conduction control terminal side.

24. The motor in accordance with claim 23, wherein

said FET power current-mirror circuit includes said FET power transistor, an FET transistor and a resistor,

a control terminal side of said FET power transistor is connected to a control terminal side of said FET transistor,

one terminal side of a current-path terminal pair of said FET transistor is connected to a conduction control terminal side of said at least one piece of power amplifying means via said resistor,

the other terminal side of the current-path terminal pair of said FET transistor is connected to one terminal side of a current-path terminal pair of said FET power transistor, and

the control terminal side of said FET power transistor is connected to the conduction control terminal side of said at least one piece of power amplifying means.

25. The motor in accordance with claim 23, wherein

said FET power current-mirror circuit includes said FET power transistor, an FET transistor and a resistor,

a control terminal side of said FET power transistor is connected to a control terminal side of said FET transistor,

one terminal side of a current-path terminal pair of said FET transistor is connected to one terminal side of a current-path terminal pair of said FET power transistor via said resistor,

the other terminal side of the current-path terminal pair of said FET transistor is connected to a conduction control terminal side of said of at least one piece of power amplifying means, and

the control terminal side of said FET power transistor is connected to the conduction control terminal side of said at least one piece of power amplifying means.

26. The motor in accordance with claim 23, wherein

said first distribution control means and said second distribution control means include means for supplying a current signal varying smoothly or substantially smoothly at least in rising and/or falling slopes to a conduction control terminal side of said at least one piece of said power amplifying means.

27. A motor comprising:

a movable member;

plural-phase windings;

voltage supplying means for supplying a DC voltage,

Q pieces (Q is an integer of 3 or more) of first power amplifying means each including a first power transistor for forming a current path between one output terminal side of said voltage supplying means and one of said plural-phase windings;

Q pieces of second power amplifying means each 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 plural-phase windings;

altering signal producing means for producing plural-phase altering signals;

first distribution control means for supplying first Q-phase signals, each having an active electrical angle larger than 360/Q degrees, to a conduction control terminal side of each of said Q pieces of first power amplifying means responding with output signals of said altering signal producing means;

second distribution control means for supplying second Q-phase signals, each having an active electrical angle larger than 360/Q degrees, to a conduction control terminal side of each of said Q pieces of second power amplifying means responding with output signals of said altering signal producing means; and

switching operation means for causing at least one of Q pieces of said first power transistors and Q pieces of said second power transistors to perform high-frequency switching, and for causing at least either said Q pieces of first power amplifying means or said Q pieces of second power amplifying means to perform off-operation simultaneously at their conduction control terminal sides responding with a single pulse signal.

28. The motor in accordance with claim 27, wherein

said first distribution control means includes means for supplying first Q-phase current signals as said first Q-phase signals, each having an active electrical angle larger than 360/Q degrees, to a conduction control terminal side of each of said Q pieces of first power amplifying means, and

said second distribution control means includes means for supplying second Q-phase current signals as said second Q-phase signals, each having an active electrical angle larger than 360/Q degrees, to a conduction control terminal side of each of said Q pieces of second power amplifying means.

29. The motor in accordance with claim 28, wherein

said first distribution control means and said second distribution control means include means for varying at least some part of said first Q-phase current signals or said second Q-phase current signals corresponding to a command signal which commands a supply power to said plural-phase windings.

30. The motor in accordance with claim 27, wherein

said switching operation means includes current detecting means for obtaining a current detected signal corresponding to a composed supply current to said plural-phase windings and switching control means for comparing an output signal of said current detecting means with a command signal, thereby causing at least either said Q pieces of first power amplifying means or said Q pieces of second power amplifying means to perform off-operation simultaneously responding with a comparison result.

31. The motor in accordance with claim 27, wherein

said first distribution control means and said second distribution control means include auxiliary supply means for supplying at least one auxiliary signal to a conduction control terminal side of at least one piece of said Q pieces of first power amplifying means and said Q pieces of second power amplifying means.

32. The motor in accordance with claim 27, wherein

at least one piece of said Q pieces of first power amplifying means and said Q pieces of second power amplifying means includes an FET power current-mirror circuit having an FET power transistor thereby performing current amplifying operation of an input current signal to the conduction control terminal side.

33. The motor in accordance with claim 27, wherein

each of said first Q-phase signals is configured to have an active electrical angle of 150 degrees or more, and

each of said second Q-phase signals is configured to have an active electrical angle of 150 degrees or more.

34. A motor comprising:

a movable member;

plural-phase windings;

voltage supplying means for supplying a DC voltage,

Q pieces (Q is an integer of 3 or more) of first power amplifying means each including a first power transistor for forming a current path between a negative terminal side of said voltage supplying means and one of said plural-phase windings;

Q pieces of second power amplifying means each including a second power transistor for forming a current path between a positive terminal side of said voltage supplying means and one of said plural-phase windings;

altering signal producing means for producing plural-phase altering signals;

first distribution control means for controlling said Q pieces of first power amplifying means responding with output signals of said altering signal producing means; and

second distribution control means for controlling said Q pieces of second power amplifying means responding with output signals of said altering signal producing means;

and that

said first distribution control means and said second distribution control means include;

means for supplying at least a current signal, varying smoothly or substantially smoothly at least in rising and/or falling slopes, to a conduction control terminal side of at least one piece of power amplifying means among said Q pieces of first power amplifying means and said Q pieces of second power amplifying means, and

means for supplying at least an auxiliary signal, which has an active period smaller than that of said at least a current signal within a conduction interval of said at least a current signal, to the conduction control terminal side of said at least one piece of power amplifying means.

35. The motor in accordance with claim 34, wherein

said first distribution control means includes means for supplying first Q-phase current signals varying smoothly or substantially smoothly at least in rising and/or falling slopes to the conduction control terminal sides of said Q pieces of first power amplifying means, and auxiliary means for supplying first Q-phase auxiliary signals to the conduction control terminal sides of said Q pieces of first power amplifying means.

36. The motor in accordance with claim 34, wherein

said second distribution control means includes means for supplying second Q-phase current signals varying smoothly or substantially smoothly at least in rising and/or falling slopes to the conduction control terminal sides of said Q pieces of second power amplifying means, and auxiliary means for supplying second Q-phase auxiliary signals to the conduction control terminal sides of said Q pieces of second power amplifying means.

37. The motor in accordance with claim 34, wherein

said first distribution control means and said second distribution control means include means for varying at least a slope of said at least a current signal corresponding to a command signal which commands a supply power to said plural-phase windings.

38. The motor in accordance with claim 34, further comprising switching operation means for causing at least one piece of said Q pieces of first power amplifying means and said Q pieces of second power amplifying means to perform high-frequency on-off switching.

39. The motor in accordance with claim 38, wherein

said switching operation means includes current detecting means for obtaining a current detected signal corresponding to a composed supply current to said plural-phase windings and switching control means for comparing an output signal of said current detecting means with a command signal, thereby causing at least either said Q pieces of first power amplifying means or said Q pieces of second power amplifying means to perform off-operation simultaneously responding with a comparison result.

40. The motor in accordance with claim 34, wherein

said first distribution control means and said second distribution control means include means for mixing said at least a current signal with said at least an auxiliary signal, thereby supplying a mixed signal to the conduction control terminal side of said at least one piece of power amplifying means.

41. The motor in accordance with claim 34, wherein

at least one piece of said Q pieces of first power amplifying means and said Q pieces of second power amplifying means includes an FET power current-mirror circuit having an FET power transistor, thereby amplifying an input current signal to the conduction control terminal side.

42. The motor in accordance with claim 34, wherein

said at least an auxiliary signal has an active electrical angle equal to or substantially equal to 360/Q degrees.

43. The motor in accordance with claim 34, wherein

said at least a current signal has an active electrical angle of 150 degrees or more.

44. A motor comprising:

a movable member;

plural-phase windings;

voltage supplying means for supplying a DC voltage;

Q pieces (Q is an integer of 3 or more) of first power amplifying means each including a first FET power transistor for forming a current path between one output terminal side of said voltage supplying means and one of said plural-phase windings;

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

altering signal producing means for producing plural-phase altering signals;

first distribution control means for supplying first Q-phase signals, each having an active electrical angle larger than 360/Q degrees, to a conduction control terminal side of each of said Q pieces of first power amplifying means responding with output signals of said altering signal producing means;

second distribution control means for supplying second Q-phase signals, each having an active electrical angle larger than 360/Q degrees, to a conduction control terminal side of each of said Q pieces of second power amplifying means responding with output signals of said altering signal producing means; and

switching operation means including;

current detecting means for obtaining a current detected signal corresponding to a conducted current signal of said voltage supplying means; and

switching control means for comparing an output signal of said current detecting means with a command signal and switching at least one FET power transistor of Q pieces of said first FET power transistors and Q pieces of said second FET power transistors to on state at a predetermined time interval and to off state at a timing when the output signal of said current detecting means becomes a value corresponding to the command signal, thereby causing said at least one FET power transistor to perform high-frequency switching responding with a comparison result.

45. The motor in accordance with claim 44, wherein

said first distribution control means includes means for supplying first Q-phase current signals as said first Q-phase signals, each having an active electrical angle larger than 360/Q degrees, to a conduction control terminal side of each of said Q pieces of first power amplifying means, and

said second distribution control means includes means for supplying second Q-phase current signals as said second Q-phase signals, each having an active electrical angle larger than 360/Q degrees, to a conduction control terminal side of each of said Q pieces of second power amplifying means.

46. The motor in accordance with claim 45, wherein

said first distribution control means and said second distribution control means include means for varying at least some part of said first Q-phase current signals or said second Q-phase current signals corresponding to a command signal (Ad) which commands a supply power to said plural-phase windings.

47. The motor in accordance with claim 44, wherein

at least one piece of said Q pieces of first power amplifying means and said Q pieces of second power amplifying means includes an FET power current-mirror circuit having an FET power transistor, thereby amplifying an input current signal to the conduction control terminal side.