Motor and disk drive apparatus

A motor comprising:

• a rotor which has a field part generating field fluxes;
• Q-phase windings, Q being an integer of 3 or more;
• voltage supplying means which includes two output terminals for supplying a DC voltage;
• power supplying means having Q first power transistors and Q second power transistors for supplying a power to said Q-phase windings, 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;
• activation control means for controlling said Q first power transistors and said Q second power transistors;
• 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 corresponding to a command signal;
• and that
• said activation control means determines active periods of said Q first power transistors and said Q second power transistors, each of said active periods being larger than the period of 360/Q electrical degrees, and
• said switching operation means includes:
• current detecting means for producing a current detected signal which responds with or corresponds to a current from said voltage supplying means to said Q-phase windings, and
• switching control means for producing a main switching pulse signal and an auxiliary switching pulse signal which respond with said current detected signal and said command signal, providing a time between an effective period of said main switching pulse signal and an effective period of said auxiliary switching pulse signal, causing at least one of said Q first power transistors to become ON in the effective period of said main switching pulse signal, causing at least one of said Q second power transistors to become ON in the effective period of said auxiliary switching pulse signal, and executing high-frequency switching operation of at least one second power transistor among said Q second power transistors responding with said auxiliary switching pulse signal when two first power transistors among said Q first power transistors simultaneously execute high-frequency switching operation responding with said main switching pulse signal while at least another second power transistor among said Q second power transistors executes ON operation.

A disk drive apparatus comprising:

• a head for at least reproducing a signal from a disk or recording a signal on a disk;
• processing means for at least processing an output signal from said head and outputting a reproducing information signal, or processing a recording information signal and outputting a signal into said head;
• a rotor which has a field part generating field fluxes, and directly drives said disk;
• Q-phase windings, Q being an integer of 3 or more;
• voltage supplying means which include two output terminals for supplying a DC voltage;
• power supplying means having Q first power transistors and Q second power transistors for supplying a power to said Q-phase windings, 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;
• state shifting means for shifting a holding state from one state to at least one other state in sequence responding with the detected pulse signal of said voltage detecting means;
• activation control moans for controlling active periods of said Q first power transistors and said Q second power transistors responding with said holding state;
• 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 corresponding to a command signal;
• and that
• 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,
• said activation control means produces Q-phase first activation control signals and Q-phase second activation control signals responding with said holding state of said state shifting means for controlling said active periods of said Q first power transistors and said Q second power transistors, each of said active periods being larger than the period of 360/Q electrical degrees, and
• said switching operation means includes:
• current detecting means for producing a current detected signal which responds with or corresponds to a current from said voltage supplying means to said Q-phase windings, and
• switching control means for producing a main switching pulse signal and an auxiliary switching pulse signal which respond with said current detected signal and said command signal, providing a time between an effective period of said main switching pulse signal and an effective period of said auxiliary switching pulse signal, causing at least one of said Q first power transistors to become ON in the effective period of said main switching pulse signal, causing at least one of said Q second power transistors to become ON in the effective period of said auxiliary switching pulse signal, and executing high-frequency switching operation of at least one second power transistor among said Q second power transistors responding with said auxiliary switching pulse signal when two first power transistors among said Q first power transistors simultaneously execute high-frequency switching operation responding with said main switching pulse signal while at least another second power transistor among said Q second power transistors executes ON operation.

A disk drive apparatus comprising;

• a head for at least reproducing a signal from a disk or recording a signal on a disk;
• processing means for at least processing an output signal from said head and outputting a reproducing information signal, or processing a recording information signal and outputting a signal into said head;
• a rotor which has a field part generating field fluxes, and directly drives said disk;
• Q-phase windings, Q being an integer of 3 or more;
• voltage supplying means which include two output terminals for supplying a DC voltage;
• power supplying means having Q first power transistors and Q second power transistors for supplying a power to said Q-phase windings, 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;
• activation control means for controlling said O first power transistors and said Q second power transistors;
• 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 corresponding to a command signal;
• and that
• said activation control means determines active periods of said Q first power transistors and said Q second power transistors, each of said active periods being larger than the period of 360/Q electrical degrees, and
• said switching operation means includes:
• current detecting means for producing a current detected signal which responds with or corresponds to a current from said voltage supplying means to said Q-phase windings, and
• switching control means for producing a main switching pulse signal and an auxiliary switching pulse signal which respond with said current detected signal and said command signal, providing a time between an effective period of said main switching pulse signal and an effective period of said auxiliary switching pulse signal, causing at least one of said Q first power transistors to become ON in the effective period of said main switching pulse signal, causing at least one of said Q second power transistors to become ON in the effective period of said auxiliary switching pulse signal, and executing high-frequency switching operation of at least one second power transistor among said Q second power transistors responding with said auxiliary switching pulse signal when two first power transistors among said Q first power transistors simultaneously execute high-frequency switching operation responding with said main switching pulse signal while at least another second power transistor among said Q second power transistors executes ON operation.