Abstract: A motor drive circuit includes; a rotor position detector that detects a position of a rotor and outputs a rotor position detection signal; a rotor position signal generator that generates signals P1, P2, P3, P4, P5, and P6 as a rotor position signal based on the rotor position detection signal output from the rotor position detector; a rotation direction recognition unit that recognizes a rotation direction of the rotor each time one of signals P1, P2, P3, P4, P5, and P6 is input and replaces the rotor position signal with a corrected rotor position signal; and a winding current output unit that outputs a current to a winding based on the corrected rotor position signal.

Abstract: A motor drive circuit includes; a rotor position detector that detects a position of a rotor and outputs a rotor position detection signal; a rotor position signal generator that generates signals P1, P2, P3, P4, P5, and P6 as a rotor position signal based on the rotor position detection signal output from the rotor position detector; a rotation direction recognition unit that recognizes a rotation direction of the rotor each time one of signals P1, P2, P3, P4, P5, and P6 is input and replaces the rotor position signal with a corrected rotor position signal; and a winding current output unit that outputs a current to a winding based on the corrected rotor position signal.

Abstract: A motor device comprising a motor, and a drive control circuit for driving and controlling the motor, in which the drive control circuit includes a control unit for generating a control signal for controlling the rotation of the motor, a drive unit for driving the motor on the basis of the control signal, and a communication unit for making serial communications via a serial communication bus for transmitting serial data. This communication unit has an address generating function for generating and setting addresses.

Abstract: The present invention is directed to a motor current phase detecting device that drives a motor having a three-phase drive coil, the device including a power distributor that supplies a drive voltage and a drive current to the drive coil, a current detector that detects a common current waveform flowing from the power distributor, a position detector that detects a position of a rotor, a waveform generator that generates a first PWM signal, a waveform regulator that generates a second PWM signal based on the first PWM signal, and a current phase detector that detects a phase of a drive current flowing in each of the drive coil.

Abstract: A motor driver according to the invention comprises (i) an energizing unit supplying drive voltage and drive current to a motor including a moving body and coils, (ii) a speed-position detector detecting a drive speed of the motor and a position of the moving body to output a speed position signal including drive-speed information and position information. The motor driver also includes (iii) a reference signal generator outputting a reference signal, (iv) a phase signal generator using the speed-position signal, the reference signal, and a set signal to output a phase signal indicating a phase of the supplied drive voltage, and (v) a waveforms generator using the position information and the phase signal to output a control signal to the energizing unit. A phase of the supplied drive voltage is regulated to be proportional to the drive speed, wherein a degree of the proportion is set by the set signal.

Abstract: A motor driving device (100) includes an inverter (20), a speed control unit (40), and a regeneration preventing means (50). The inverter (20) converts supplied DC power to driving power for driving a motor (10), and supplies the driving power to the motor (10). The speed control unit (40) generates a speed control signal group based on a speed command signal Sref and a speed detection signal N, and adjusts the driving power based on a drive control signal VSP1 included in the speed control signal group, thereby controlling the speed of the motor (10).

Abstract: A motor driving device according to the present invention includes: a serial communication unit that conducts communication through a serial communication bus, the serial communication bus including a serial data line through which serial data is transmitted and a clock line through which a clock signal is transmitted; and a drive control unit that controls a driving operation of a motor. The motor driving device is configured such that a clock signal received from the serial communication bus is used as a reference clock signal of the drive control unit.

Abstract: A motor device comprising a motor, and a drive control circuit for driving and controlling the motor, in which the drive control circuit includes a control unit for generating a control signal for controlling the rotation of the motor, a drive unit for driving the motor on the basis of the control signal, and a communication unit for making serial communications via a serial communication bus for transmitting serial data. This communication unit has an address generating function for generating and setting addresses.

Abstract: A motor driving device (100) includes an inverter (20), a speed control unit (40), and a regeneration preventing means (50). The inverter (20) converts supplied DC power to driving power for driving a motor (10), and supplies the driving power to the motor (10). The speed control unit (40) generates a speed control signal group based on a speed command signal Sref and a speed detection signal N, and adjusts the driving power based on a drive control signal VSP1 included in the speed control signal group, thereby controlling the speed of the motor (10).

Abstract: A motor driver according to the invention comprises an energizing unit (20), which supplies drive voltage and drive current to a motor (30) including a moving body and three-phase coils (31), a speed-position detector (40), which detects drive speed of the motor and a position of the moving body to output, as a speed position signal RS, which includes drive-speed information and position information, a reference signal generator (12), which outputs a reference signal CLK for the drive speed, a phase signal generator (11), which uses a speed-position signal RS, a reference signal CLK, and a set signal PA indicative of an optional value to output a phase signal PS indicative of phase of the drive voltage supplied to the coil (31), and a waveforms generator (14), which uses the position information and a phase signal PS to output a control signal to the energizing unit (20).

Abstract: A gate driver for forcing a power transistor including a gate electrode insulated with oxide film into conduction or shut-off, the gate driver includes a first current source for outputting a first current value to raise an electric potential of the gate electrode for changing shut-off state of the power transistor to conductive state; and a second current source for outputting a second current value to lower the electric potential of the gate electrode for changing the conductive state of the power transistor to the shut-off state. The first current value and the second current value are assigned based on at least one kind of current-source control information. This structure allows preparing an appropriate speed of forcing the power transistor into conduction or shut-off with a small number of elements, and the gate driver can be used with ease for driving power transistors having different output sizes.

Abstract: A motor driving device includes a motor having three-phase driving coils, a power feeder for powering the coils, and a power feeding controller for controlling a power feeding method. The controller controls electrical potentials of the coils in a period of applying a voltage to the coils to be a power-supply voltage potential or the grounding potential by turning on or off transistors in the power feeder during a first feeding period which starts from a motor halt status and ends when the motor is driven at a given speed. During a second feeding period where the motor is driven at a speed over the given speed, the controller controls the potential such that the coils are opened by turning off the transistors or the potential becomes the power-supply voltage potential. This structure allows the motor driving device to drive the motor at a lower noise with less vibrations.

Abstract: A motor driver includes a first signal selector and a second signal selector. The first signal selector is used for selecting a signal to be supplied to an energizing unit of driving coils, and selects either one of a normal energizing pattern signal supplied from an energizing signal generator or a signal from the second signal selector based on a signal from an over-current detector. The second signal selector selects either one of a first non-normal energizing pattern signal from a first energizing signal output unit or a second non-normal energizing pattern signal from a second energizing signal output unit based on a signal from a rotary direction detector.

Abstract: A motor driving device includes a motor having three-phase driving coils, a power feeder for powering the coils, and a power feeding controller for controlling a power feeding method. The controller controls electrical potentials of the coils in a period of applying a voltage to the coils to be a power-supply voltage potential or the grounding potential by turning on or off transistors in the power feeder during a first feeding period which starts from a motor halt status and ends when the motor is driven at a given speed. During a second feeding period where the motor is driven at a speed over the given speed, the controller controls the potential such that the coils are opened by turning off the transistors or the potential becomes the power-supply voltage potential. This structure allows the motor driving device to drive the motor at a lower noise with less vibrations.

Abstract: In a motor driver, based on driving waveforms of respective phases generated by a driving waveform generator, a power feeder feeds respective phase-coils with an alternating current consecutively changing in sine wave. Further, a phase advancing controller adjusts phases of the driving waveform, and performs phase-advancing control such that each phase of back electromotive forces induced in respective phase-coils generally coincides with a phase of the ac running through the coils. In phase-advancing controlling, a phase current is detected with a common current. The structure discussed above can reduce torque ripples, vibrations and noises, and a motor thus can be driven efficiently.

Abstract: A gate driver for forcing a power transistor including a gate electrode insulated with oxide film into conduction or shut-off, the gate driver includes a first current source for outputting a first current value to raise an electric potential of the gate electrode for changing shut-off state of the power transistor to conductive state; and a second current source for outputting a second current value to lower the electric potential of the gate electrode for changing the conductive state of the power transistor to the shut-off state. The first current value and the second current value are assigned based on at least one kind of current-source control information. This structure allows preparing an appropriate speed of forcing the power transistor into conduction or shut-off with a small number of elements, and the gate driver can be used with ease for driving power transistors having different output sizes.

Abstract: A motor driving device includes (a) a wide-angle feeding device for feeding power to three-phase coils in a width of 150 degrees in electrical angles and (b) a feeding amount controller for controlling a feeding amount to the coils. During overlapping periods, in which adjacent coils out of the three coils are in the same fed condition, an amount of a first value is fed to the coils and an amount of a second value is fed during the periods other than the overlapping periods. This structure allows the motor to reduce torque ripples, vibrations as well as noises during its operation, and at the same time, the motor can produce a greater output and operate at higher efficiency.

Abstract: In a motor driver, based on driving waveforms of respective phases generated by a driving waveform generator, a power feeder feeds respective phase-coils with an alternating current consecutively changing in sine wave. Further, a phase advancing controller adjusts phases of the driving waveform, and performs phase-advancing control such that each phase of back electromotive forces induced in respective phase-coils generally coincides with a phase of the ac running through the coils. In phase-advancing controlling, a phase current is detected with a common current. The structure discussed above can reduce torque ripples, vibrations and noises, and a motor thus can be driven efficiently.

Abstract: A motor driver includes a driving waveform generator simply constructed. Because the generator produces a waveform having rather small numbers of steps divided and voltage levels divided. Respective phase-driving signals responsive to a step-like voltage waveform produced by the generator are applied to a power feeder, so that an alternate current—shaping in a sine wave and changing sequentially—runs through respective phase-coils. Further, phase-advancing control realizes phase agreement between respective phase-currents and back electromotive force generated each of the respective phases. As a result, a motor can be driven efficiently with less torque ripples, vibrations and noises.

Abstract: A motor driving device includes (a) a wide-angle feeding device for feeding power to three-phase coils in a width of 150 degrees in electrical angles and (b) a feeding amount controller for controlling a feeding amount to the coils. During overlapping periods, in which adjacent coils out of the three coils are in the same fed condition, an amount of a first value is fed to the coils and an amount of a second value is fed during the periods other than the overlapping periods. This structure allows the motor to reduce torque ripples, vibrations as well as noises during its operation, and at the same time, the motor can produce a greater output and operate at higher efficiency.