Abstract: A stepping motor driving device includes a table, a driving pulse control part, an interpolation number indicating part and a driving part. The table stores thinned data which is thinned from original data and designates a pulse width of a driving pulse relating to a slow-up control or a slow-down control of a stepping motor. The driving pulse control part sequentially reads the thinned data from the table at predetermined intervals, to interpolate the thinned data in accordance with a given interpolation number so as to generate interpolated data and to output the driving pulse with the pulse width designated by the thinned data or the interpolated data by sequentially using the thinned data and the interpolated date at predetermined intervals. The interpolation number indicating part indicates the interpolation number to the driving pulse control part. The driving part drives the stepping motor in accordance with the driving pulse.

Abstract: There is provided a fail-safe apparatus for an inverter that can suppress the voltage of a DC power source from rising when the voltage of the DC power source becomes excessive, due to an abnormality caused in an inverter that performs driving and electric-power generation by use of a synchronous motor in which a permanent magnet is utilized as a magnetic-field magnet. The fail-safe apparatus for the inverter includes an excessive voltage detection circuit for detecting a state of excessive voltage while monitoring the voltage of the DC power source of the inverter and a drive switching circuit for switching a driving method for a semiconductor switching device between three-phase PWM driving and three-phase short-circuiting driving in accordance with the state of an excessive voltage detection circuit.

Abstract: Power electronics unit, which comprises a controller and at least one half bridge with a first switching element and with a second switching element, and has a phase current output between the two switching elements, at which phase current output the first switching element and the second switching element can be switched in the push-pull mode for a switching time at a cycle frequency, and at which the controller sets the switching time and/or the cycle frequency as a control variable, in order to provide, at the phase current output, a specified amplitude, frequency and phase position of the phase current in a switching cycle, so that the amplitude, the frequency and the phase position at the phase current output can be predicted at the phase current output for the switching cycle, the polarity of the phase current is used as an observation variable, and the determined switching time for the switching cycle is a function of the direction of the predicted phase current.

Abstract: An electric vehicle system featuring a novel idling capability is presented. The vehicle performs without electricity from an external power source resulting in decreased entropy generation. It also asserts a zero carbon footprint while excluding typical emissions produced by conventional all-electric vehicles. This novel invention has a capacity between idle speed (1000 rpm) and high speed (6000 rpm) using a constant electric current.

Abstract: A method for determining a direction of rotation for an electronically commutated motor (ECM) is described. The motor is configured to rotate a blower and the method comprises rotating the blower using the ECM and determining if the resulting blower rotation is indicative of the desired direction of rotation for the blower.

Abstract: In order to highly accurately estimate a temperature of a permanent magnet to be used for a rotor of a motor, provided is a motor control device for a vehicle including a motor as a drive power source, in which an estimation mode setting section sets, when a predetermined condition for estimating the temperature of the permanent magnet to be used for the rotor of the motor is established under a state in which the motor generates drive power to run the vehicle, a current flowing through the motor to 0, and a permanent magnet temperature estimation section estimates the temperature of the permanent magnet based on an induced voltage of the motor in a period during which the current flowing through the motor is 0.

Abstract: A double-rotor switched reluctance machine includes a stator, a first rotor, and a second rotor. The stator and the first rotor operate as a first electric machine and the stator and the second rotor operate as a second electric machine. Each electric machine has an output torque profile that fluctuates periodically between a maximum and a minimum instantaneous torque. The double-rotor switched reluctance machine is configured so that when the first and second electric machines are operated at a common electrical frequency, the first and second maximum instantaneous torques are temporally offset, thereby reducing the overall torque ripple of the switched reluctance machine. Additionally, or alternatively, a double-rotor switched reluctance machine is configured so that the first and second rotors are radially offset from each other to reduce a net radial force imposed on the stator by the operation of the first and second electric machines.

Abstract: System for moving a mobile tendon controlled platform robot, comprising a mobile platform, at least one drive and at least one tendon connected to the mobile platform, wherein the relative position of the at least one tendon with respect to the mobile platform is controllable with the at least one drive, and wherein the at least one tendon is enabled to move without chafing past a surface of an object external to the mobile tendon controlled platform robot.

Abstract: A method to be used for controlling a screen (1) including a load bar (2), a flexible element (4) supporting the load bar, and at least one controlled member for winding the flexible member, in order to move the load bar (2) between a first high or low position and a second low or high position, the movement resulting from an angular movement of the winding member. The method includes at least one step in which the angular movement of the of the winding member (52) is controlled with a temporal set value (?(t)) of the instantaneous angular position (?(t)) of the winding member (52).

Abstract: Apparatuses, methods, and systems offering enhanced robustness, efficiency and rated voltage operability for refrigerant compressor drives are disclosed. An exemplary embodiment is a method of operating a variable frequency drive. The method includes operating the drive over a first operating range to provide at least a desired operating speed and minimize d-axis current, operating the drive over a second operating range including injecting d-axis current to provide at least the desired operating speed, operating the drive over a third operating range at a de-rated speed less than the desired operating speed. In the first operating range the drive input voltage is greater than a first value. In the second operating range the drive input voltage is lower than the first value and greater than a second value. In the third operating range the drive input voltage is lower than the second value.

Abstract: A motor control device driving a motor via an inverter circuit includes a current sensing element, a PWM signal generation unit and a current detection unit. The PWM signal generation unit is configured to generate three-phase PWM signals in a manner such that the current detection unit is capable of detecting two-phase currents at two fixed time-points within a carrier period of the PWM signal. A duty of one of the three-phase PWM signals is increased/decreased to both phase lag side and phase lead side with reference to any phase. A duty of another phase PWM signal is increased/decreased to both phase lag side and phase lead side with reference to any phase away one half of the carrier period from the reference phase. A duty of the other phase PWM signal is increased/decreased to either phase lag side or phase lead side with reference to any phase.

Abstract: Systems and methods are provided for performing diagnostic testing for multiple motor drives operating in parallel. In one embodiment, the diagnostic testing may involve determining which of the multiple motor drives are in operation and communicating the active configuration of motor drives to testing circuitry. The testing circuitry generates an enable input signal transmitted to the transistor gates in each of the active motor drives. The testing circuitry also generates a power supply input signal transmitted to a DC to DC converter in each of the active motor drives. The responses to the enable input signal and the power supply input signal are measured to determine safety compliance.

Abstract: An electrically driven vehicle (2) is equipped with a motor (9) for running, a first battery (4), a second battery (3), a liquid-cooled cooler that cools the first battery, and a temperature adjuster. The first battery is configured to supply an electric power to the motor, and has a first capacity and a first output. The second battery is configured to supply an electric power to the motor, and has a second capacity that is different from the first capacity, and a second output that is different from the first output. The temperature adjuster is configured to adjust a temperature of the second battery using a gas as a heat medium.

Abstract: A motor driving apparatus for a washing machine, in which a motor is a washing machine motor with a double stator and a double rotor respectively having first and second U-phase, V-phase, and W-phase stator coils, includes: a motor controller for generating a drive signal in accordance with a washing mode, a rinsing mode and a dewatering mode; an inverter for generating a three-phase alternating-current (AC) power, in which any one-phase AC power of the three-phase AC power is applied in common to any one-phase stator coil of the first and second U-phase, V-phase, and W-phase stator coils for the washing machine motor; and a switching unit for switching to apply the remaining two-phase AC power of the three-phase AC power to any two-phase stator coils of the remaining two-phase stator coils of the first and second U-phase, V-phase, and W-phase stator coils for the washing machine motor.

Abstract: Provided is a method for preventing overheating of a traction motor in an electric vehicle. The method for preventing the overheating of the traction motor in the electric vehicle includes identifying magnitude of an output load of the motor, identifying a loading time of the motor on the basis of the identified magnitude of the output load, comparing the identified loading time to a preset critical time, and controlling output torque of the motor according to the comparison result.

Abstract: A power supply device has a first power supply capable of storing and discharging electric power, a second power supply connected in series to the first power supply and capable of storing and discharging the electric power, an isolated DC-DC converter including a primary side terminal to which the first power supply is connected, and a secondary side terminal to which the second power supply is connected, and a power supply control unit that controls a voltage of the second power supply using the isolated DC-DC converter. A direct-current voltage outputted from the first power supply and the second power supply connected in series is inputted to a first inverter, converted into an alternating-current voltage by the first inverter, and then supplied to a vehicle drive motor.

Abstract: There is provided a motor controller including: a voltage generator that generates a voltage applied to a motor; a temperature detector that detects a temperature of a circuit; a rotation speed detector that detects a rotation speed of the motor; and a voltage controller that controls the voltage generator so as to generate a voltage of a duty ratio based on a speed instruction value, and that, in cases in which a temperature of an element configuring the circuit, computed based on the temperature of the circuit detected by the temperature detector, the rotation speed of the motor detected by the rotation speed detector, and a load of the circuit, reaches a predetermined threshold value or above, controls the voltage generator so as to generate a voltage of a duty ratio that is lower than the duty ratio based on the speed instruction value.

Abstract: In an apparatus, a first control unit performs current-feedback control, and a second control unit performs torque-feedback control. The torque-feedback control samples values of each output current at phases. The sampled values of each output current at the phases are referred to as phase-related sampled values of the corresponding output current. The apparatus causes the second control unit to sample values of each output current at the predetermined phases while the first control unit is performing the current-feedback control when switching the current-feedback control to the torque-feedback control. The second control unit uses the values of each output current sampled by the first control unit as the phase-related sampled values of the corresponding output current to start the torque-feedback control when the current-feedback control is switched to the torque-feedback control.

Abstract: A motor control device is provided, which includes a power converter for applying output voltage according to a voltage command to an electric motor, a magnetic flux estimator for estimating a vector of stator magnetic flux of the electric motor based on a difference between the output voltage and a voltage drop caused by a coil resistance of the electric motor, and a phase estimator for estimating a phase of the stator magnetic flux based on the vector of the stator magnetic flux estimated by the magnetic flux estimator. The magnetic flux estimator includes a variable low-pass filter for applying a low-pass filter to the difference at a cut-off frequency according to a frequency of the output voltage, and a phase adjuster for retarding at least one of an output phase of the variable low-pass filter and a phase of the difference before inputted into the variable low-pass filter.

Abstract: A battery pack monitoring system is provided that continually monitors the current at the fuse and, when the system determines that the fuse is close to its operating limit, limits battery pack current by limiting traction motor torque.