Disk drive apparatus and motor

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;
• 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 one 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 the other output terminal side of said voltage supplying means and one of said Q-phase windings;
• voltage detecting means for producing a detected pulse signal responding with terminal voltages of said Q-phase windings, for producing a speed pulse signal which corresponds to a rotational speed of said disk and for producing a detection informing signal at an edge of the detected pulse signal;
• activation operation means for controlling active periods of said Q first power transistors and said Q second power transistors responding with said detected pulse signal of said voltage detecting means, each of said active periods being an electrical angle which is larger than 360/Q degrees;
• commanding means for producing a command signal responding with said speed pulse signal;
• and
• switching operation means including:
• current detecting means for producing a current-detection signal responding with or corresponding to a composed supply current from said voltage supplying means to said Q-phase windings, and
• switching control means for producing a switching pulse signal responding with said current-detection signal and said command signal, causing at least one power transistor among said Q first power transistors and said Q second power transistors to perform high-frequency switching responding with said switching pulse signal so that the rotational speed of said disk is controlled responding with said speed pulse signal, and changing a timing of said switching pulse signal responding with each occurrence timing of detection of said detection informing signal.

A disk drive apparatus comprising:

• head means and processing means for at least reproducing a signal from a disk or recording a signal on said disk;
• power transistors for forming current paths to plural-phase windings so as to rotate said disk;
• voltage detecting means for producing a detected pulse signal responding with terminal voltages of said plural-phase windings for producing a speed pulse signal which corresponds to a rotational speed of said disk and a detection informing signal at an edge of the detected pulse signal;
• activation operation means for controlling active periods of said power transistors responding with said detected pulse signal;
• and switching operation means for producing a switching pulse signal corresponding to a command signal which responds with said speed pulse signal, causing at least one power transistor of said power transistors to perform high-frequency switching responding with said switching pulse signal so that the rotational speed of said disk is controlled responding with said speed pulse signal, and changing a timing of said switching pulse signal responding with each occurrence timing of detection of said detection informing signal.

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 one 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 the other output terminal side of said voltage supplying means and one of said Q-phase windings;
• voltage detecting means for producing a detected pulse signal responding with terminal voltages of said Q-phase windings, for producing a speed pulse signal which corresponds to a rotational speed of said disk and for producing a detection informing signal at an edge of the detected pulse signal;
• activation operation means for controlling active periods of said Q first power transistors and said Q second power transistors responding with said detected pulse signal of said voltage detecting means, each of said active periods being an electrical angle which is larger than 360/Q degrees;
• commanding means for producing a command signal responding with said speed pulse signal;
• and
• switching operation means for producing a switching pulse signal corresponding to said command signal, causing at least one power transistor among said Q first power transistors and said Q second power transistors to perform high-frequency switching responding with said switching pulse signal so that the rotational speed of said rotor is controlled responding with said speed pulse signal, and changing a timing of said switching pulse signal responding with each occurrence timing of detection of said detection informing signal from said voltage detecting means.

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 one 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 the other output terminal side of said voltage supplying means and one of said Q-phase windings;
• voltage detecting means for producing a detected pulse signal responding with terminal voltages of said Q-phase windings, for producing a speed pulse signal which corresponds to a rotational speed of said disk and for producing a detection informing signal at an edge of the detected pulse signal;
• activation operation means for controlling active periods of said Q first power transistors and said Q second power transistors responding with said detected pulse signal of said voltage detecting means, each of said active periods being an electrical angle which is larger than 360/Q degrees;
• commanding means for producing a command signal responding with said speed pulse signal;
• and
• switching operation means including:
• current detecting means for producing a current-detection signal responding with or corresponding to a composed supply current from said voltage supplying means to said Q-phase windings, and
• switching control means for producing a switching pulse signal responding with said current detection signal and said command signal, causing at least one power transistor among said Q first power transistors and said Q second power transistors to perform high-frequency switching responding with said switching pulse signal so that the rotational speed of said rotor is controlled responding with said speed pulse signal, and changing a timing of said switching pulse signal responding with each occurrence timing of detection of said detection informing signal.

A motor comprising:

• power transistors for forming current paths to plural-phase windings so as to rotate a rotor;
• voltage detecting means for producing a detected pulse signal responding with terminal voltages of said plural-phase windings and for producing a speed pulse signal which corresponds to a rotational speed of said disk and a detection informing signal at an edge of the detected pulse signal;
• activation operation means for controlling active periods of said power transistors responding with said detected pulse signal;
• and switching operation means for producing a switching pulse signal corresponding to a command signal which responds with said speed pulse signal, causing at least one power transistor of said power transistors to perform high-frequency switching responding with said switching pulse signal so that the rotational speed of said rotor is controlled responding with said speed pulse signal, and changing a timing of said switching pulse signal responding with each occurrence timing of detection of said detection informing signal.