Brushless motor and disk drive apparatus

A motor comprising:

• a rotor having a field part which generates field fluxes;
• Q-phase windings wherein 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 operation of said Q first power amplifying means and said Q second power amplifying means responding with said position signal of said position detecting means;
• and that
• said activation operation means includes:
• starting operation means for starting activation of said Q first power amplifying means and said Q second power amplifying means in response to a start signal;
• and
• rotation control means for controlling activation of said Q first power amplifying means and said Q second power amplifying means in response to said position signal after the operation of said starting operation means,
• said starting operation means comprises:
• initial phase setting means for setting an initial activation phase of drive signals to said Q-phase windings by said Q first power amplifying means and said Q second power amplifying means in response to the level of said position signal of the position detecting means at or around the timing of the occurrence of said start signal;
• phase changing means for changing sequentially the activation phase of the drive signals to said Q-phase windings by said Q first power amplifying means and said Q second power amplifying means in the positive direction in response to time;
• and
• phase correcting means for correcting the activation phase of the drive signals to said Q-phase windings in response to either or both of the rising and falling edges of said position signal;
• and
• mode select means for selecting said rotation control means in response to occurrences of said position signal, and
• said rotation control means comprises:
• time measuring means for measuring a time interval T0 which responds with an interval of said position signal;
• and
• phase adjusting means for changing the activation phase of the drive signals to said Q-phase windings in time in response to the measured value of said measuring means.

A motor comprising:

• a rotor, plural-phase windings, a DC voltage source, a plurality of first power transistors and a plurality of second power transistors forming current paths from said DC voltage source to said plural-phase windings, position detecting means producing a position signal in response to a rotation of said rotor, and activation operation means controlling activation of said first power transistors and said second power transistors,
• characterized in that
• said activation operation means includes starting operation means which comprises:
• initial phase setting means for setting an initial activation phase of drive signals to said plural-phase windings by said first power transistors and said second power transistors in response to the level of said position signal of the position detecting means at or around the timing of the occurrence of said start signal;
• phase changing means for changing sequentially the activation phase of the drive signals to said plural-phase windings by said first power transistors and said second power transistors in the positive direction in response to time;
• and
• phase correcting means for correcting the activation phase of the drive signals to said plural-phase windings in response to either or both of the rising and falling edges of said position signal.

A motor comprising:

• a rotor, plural-phase windings, a DC voltage source, a plurality of first power transistors and a plurality of second power transistors forming current paths from said DC voltage source to said plural-phase windings, position detecting means producing a position signal in response to a rotation of said rotor, and activation operation means controlling activation of said first power transistors and said second power transistors,
• characterized in that
• said activation operation means includes:
• starting operation means for starting activation of said first power transistors and said second power transistors in response to a start signal;
• and
• rotation control means for controlling activation of said first power transistors and said second power transistors in response to said position signal after the operation of said starting operation means,
• said starting operation means comprises:
• initial phase setting means for setting an initial activation phase of drive signals to said plural-phase windings by said first power transistors and said second power transistors in response to the level of said position signal of the position detecting means at or around the timing of the occurrence of said start signal;
• phase changing means for changing sequentially the activation phase of the drive signals to said plural-phase windings by said first power transistors and said second power transistors in the positive direction in response to time;
• and
• phase correcting means for correcting the activation phase of the drive signals to said plural-phase windings in response to either or both of the rising and falling edges of said position signal;
• and
• mode select means for selecting said rotation control means in response to occurrences of said position signal, and
• said rotation control means comprises:
• time measuring means for measuring a time interval T0 which responds with an interval of said position signal;
• and
• phase adjusting means for changing the activation phase of the drive signals to said plural-phase windings in time in response to the measured value of said measuring means.

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 wherein 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 operation of said Q first power amplifying means and said Q second power amplifying means responding with said position signal of said position detecting means;
• and that
• said activation operation means includes starting operation means which starts activation of said Q first power amplifying means and said Q second power amplifying means in response to a start signal, and
• said starting operation means comprises:
• initial phase setting means for setting an initial activation phase of drive signals to said Q-phase windings by said Q first power amplifying means and said Q second power amplifying means in response to the level of said position signal of the position detecting means at or around the timing of the occurrence of said start signal;
• phase changing means for changing sequentially the activation phase of the drive signals to said Q-phase windings by said Q first power amplifying means and said Q second power amplifying means in the positive direction in response to time;
• and
• phase correcting means for correcting the activation phase of the drive signals to said Q-phase windings in response to either or both of the rising and falling edges of said position signal.

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 wherein 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 operation of said Q first power amplifying means and said Q second power amplifying means responding with said position signal of said position detecting means;
• and that
• said activation operation means includes:
• starting operation means for starting activation of said Q first power amplifying means and said Q second power amplifying means in response to a start signal;
• and
• rotation control means for controlling activation of said Q first power amplifying means and said Q second power amplifying means in response to said position signal after the operation of said starting operation means,
• said starting operation means comprises:
• initial phase setting means for setting an initial activation phase of drive signals to said Q-phase windings by said Q first power amplifying means and said Q second power amplifying means in response to the level of said position signal of the position detecting means at or around the timing of the occurrence of said start signal;
• phase changing means for changing sequentially the activation phase of the drive signals to said Q-phase windings by said Q first power amplifying means and said Q second power amplifying means in the positive direction in response to time;
• and
• phase correcting means for correcting the activation phase of the drive signals to said Q-phase windings in response to either or both of the rising and falling edges of said position signal;
• and
• mode select means for selecting said rotation control means in response to occurrences of said position signal, and
• said rotation control means comprises:
• time measuring means for measuring a time interval T0 which responds with an interval of said position signal;
• and
• phase adjusting means for changing the activation phase of the drive signals to said Q-phase windings in time in response to the measured value of said measuring means.

A disk drive apparatus comprising:

• head means reproducing a signal from a disk, processing means processing an output signal from said head means and outputting a reproduced signal, a rotor driving said disk, plural-phase windings, a DC voltage source, a plurality of first power transistors and a plurality of second power transistors forming current paths from said DC voltage source to said plural-phase windings, position detecting means producing a position signal in response to a rotation of said rotor, and activation operation means controlling activation of said first power transistors and said second power transistors,
• characterized in that
• said activation operation means includes starting operation means which comprises:
• initial phase setting means for setting an initial activation phase of drive signals to said plural-phase windings by said first power transistors and said second power transistors in response to the level of said position signal of the position detecting means at or around the timing of the occurrence of said start signal;
• phase changing means for changing sequentially the activation phase of the drive signals to said plural-phase windings by said first power transistors and said second power transistors in the positive direction in response to time;
• and
• phase correcting means for correcting the activation phase of the drive signals to said plural-phase windings in response to either or both of the rising and falling edges of said position signal.

A disk drive apparatus comprising:

• head means reproducing a signal from a disk, processing means processing an output signal from said head means and outputting a reproduced signal, a rotor driving said disk, plural-phase windings, a DC voltage source, a plurality of first power transistors and a plurality of second power transistors forming current paths from said DC voltage source to said plural-phase windings, position detecting means producing a position signal in response to a rotation of said rotor, and activation operation means controlling activation of said first power transistors and said second power transistors,
• characterized in that
• said activation operation means includes:
• starting operation means for starting activation of said first power transistors and said second power transistors in response to a start signal;
• and
• rotation control means for controlling activation of said first power transistors and said second power transistors in response to said position signal after the operation of said starting operation means,
• said starting operation means comprises:
• initial phase setting means for setting an initial activation phase of drive signals to said plural-phase windings by said first power transistors and said second power transistors in response to the level of said position signal of the position detecting means at or around the timing of the occurrence of said start signal;
• phase changing means for changing sequentially the activation phase of the drive signals to said plural-phase windings by said first power transistors and said second power transistors in the positive direction in response to time;
• and
• phase correcting means for correcting the activation phase of the drive signals to said plural-phase windings in response to either or both of the rising and falling edges of said position signal;
• and
• mode select means for selecting said rotation control means in response to occurrences of said position signal, and
• said rotation control means comprises:
• time measuring means for measuring a time interval T0 which responds with an interval of said position signal;
• and
• phase adjusting means for changing the activation phase of the drive signals to said plural-phase windings in time in response to the measured value of said measuring means.