Abstract: A motor control apparatus that controls the rotational angle of a motor (111) which drives a rotating body (112) includes a synchronizing means (200) for generating and outputting an interrupt signal (700) based on an external reference signal (600) input from outside and a rotating body reference signal (500) generated by the rotating body, and a controlling means (300) for computing a command value for making the rotational angle of the motor follow a target rotational angle and outputting the command value to the motor each time the interrupt signal is inputted. The synchronizing means (200) changes the output period of the interrupt signal (700) in accordance with a time difference between the external reference signal (600) and the rotating body reference signal (500).

Abstract: A three-phase motor control apparatus 4 controlling a driver which drives a three-phase motor includes: a desired rotation angle generation section 5 which generates a desired rotation angle; a rotation angle detector 2 which detects a detected rotation angle which is the rotation angle of said three phase motor; a feedback controller 6 which generates a q-axis command reference value which controls the q-axis voltage or the q-axis current of the three-phase motor 1 in response to the desired rotation angle and the detected rotation angle; a drive torque correction section and an adder 10 which generate a q-axis command value by correcting the q-axis command reference value; and a two-phase to three-phase transformation section 8 which generates a control signal which controls the driver circuit 3 which drives the three-phase motor in response to the q-axis command.

Abstract: A micro movable mechanism system includes a micro movable mechanism. A target position generating section generates a signal indicative a target position of the micro movable mechanism. A nonlinear control unit outputs a controller output signal indicating a control value based on a difference between the target position signal and a signal indicating a current position of the micro movable mechanism. A root correction section drives the micro movable mechanism based on a signal proportional to a square root of the control value.

Abstract: An optical switching subsystem comprising; a plurality of input optical ports for inputting an optical signal, a plurality of output optical ports for outputting the optical signal, an optical switch formed by a micro electromechanical system (MEMS) for switching an optical path among said input optical ports and said output optical ports, a controller for instructing said optical switch to execute switching operation, and self-diagnosis means for measuring performance characteristics of said optical switching subsystem and diagnosing said optical switching subsystem based upon said performance characteristics.

Abstract: A micro movable mechanism system includes a micro movable mechanism. A target position generating section generates a signal indicative a target position of the micro movable mechanism. A nonlinear control unit outputs a controller output signal indicating a control value based on a difference between the target position signal and a signal indicating a current position of the micro movable mechanism. A root correction section drives the micro movable mechanism based on a signal proportional to a square root of the control value.

Abstract: In a head positioning mechanism has a micro tracking actuator which is between a carriage and a supporting spring for making the supporting spring be rotated relative to the carriage to adjust a position of a magnetic head, the micro tracking actuator has a pair of coils held to one of said carriage and said supporting spring. Each of the coils generates magnetic flux in response to a flow of electric current therein. The micro tracking actuator further has a magnet arrangement held to another of the carriage and the supporting spring to face the coil means in a predetermined direction. The magnet arrangement traverses the magnetic flux to have a particular size which varies in accordance with a predetermined relation in response to a relative movement between the coils and the magnet arrangement. The carriage is movably mounted to a magnetic disk device to which the head positioning mechanism applied.

Abstract: In a head positioning mechanism has a micro tracking actuator which is between a carriage and a supporting spring for making the supporting spring be rotated relative to the carriage to adjust a position of a magnetic head, the micro tracking actuator has a pair of coils held to one of said carriage and said supporting spring. Each of the coils generates magnetic flux in response to a flow of electric current therein. The micro tracking actuator further has a magnet arrangement held to another of the carriage and the supporting spring to face the coil means in a predetermined direction. The magnet arrangement traverses the magnetic flux to have a particular size which varies in accordance with a predetermined relation in response to a relative movement between the coils and the magnet arrangement. The carriage is movably mounted to a magnetic disk device to which the head positioning mechanism applied.