Abstract: A present invention provides a device capable of controlling a variable stiffness mechanism, which has a dielectric elastomer interposed between two members, so as to suppress an increase in the strain of the dielectric elastomer caused by the creep phenomenon. A power source control unit 21 corrects a reference supply voltage Vbase of an output voltage of a power source 10, which is determined on the basis of a desired degree of stiffness of a dielectric elastomer 1, by a feedback manipulated variable determined on the basis of a difference between a desired value of the capacitance of the elastomer 1 and an estimated value thereof, thereby setting a desired value for controlling the output voltage of the power source 10 in order to control the power source 10 according to the desired value for control.

Abstract: A device for determining a rotor position in a polyphase electric motor has a power control unit for applying drive voltages according to a pulse width modulation scheme so as to synchronously drive the motor. A measurement unit is arranged for measuring a voltage value on a respective phase by determining a zero-crossing interval where the phase current is around zero, disconnecting the phase from the respective drive voltage during the zero-crossing interval, and measuring the voltage value when the drive voltage of a first other phase is the supply voltage and the drive voltage of a second other phase is the zero voltage. A position unit is arranged for determining the rotor position based on the voltage value.

Abstract: A thrust compensation system of a dual-winding voice coil motor, which is used for driving the voice coil motor having secondary windings arranged between each pair of main windings, wherein the main windings are the main working windings of the voice coil motor and used for providing the output electromagnetic force required by the driving system of the voice coil motor; the secondary windings are compensation windings and used for providing the thrust ripple opposite to the main windings and compensating the thrust ripple of the main windings, so that the resultant force of the output thrust of the main windings and the secondary windings of the voice coil motor is constant.

Abstract: A thrust compensation system of a dual-winding voice coil motor, which is used for driving the voice coil motor having main windings (100) and secondary windings (200), wherein the secondary windings (200) of the voice coil motor are between each pair of the main windings (100).

Abstract: A robot includes a base part having a first cavity part inside, a torso part coupled to the base part, at least one arm unit provided on the torso part, and an inner box provided in the first cavity part and having a second cavity part opening in an upper portion. A circuit board for driving an actuator that operates the arm unit is provided on an outer side surface of the inner box.

Abstract: In an apparatus, a determiner determines whether a two-MG frequency ratio of a first electrical frequency of a first MG to a second electrical frequency of a second MG is within a specific frequency-ratio range. The specific frequency-ratio range includes 1/6n where n is an integer excluding zero. An update-cycle controller controls an update cycle of a command voltage according to the determined result such that the update cycle during a specific drive of the first MG is longer than the update cycle during a usual drive of the first MG while a cycle of a carrier signal is maintained during both the usual and specific drives. The specific drive represents drive of the first MG while the two-MG frequency ratio is within the specific frequency-ratio range. The usual drive represents drive of the first MG while the two-MG frequency ratio is out of the specific frequency-ratio range.

Abstract: The present disclosure illustrates a motor drive circuit. The motor drive circuit includes a resistor module, a multiplexer, a data control unit, an analog-to-digital converter and a register. The resistor module receives an input voltage and generates at least one parameter voltage. The parameter voltage is associated with a motor speed curve of a motor. The multiplexer receives the parameter voltage. The data control unit controls the multiplexer to output the parameter voltage. The analog-to-digital converter receives the parameter voltage and converts the parameter voltage to digital form, and then outputs the digital parameter voltage to the data control unit. The register stores the digital parameter voltage outputted by the data control unit. A controller determines the motor speed curve according to the digital parameter voltage stored in the register, and drives the motor in response to the motor speed curve.

Abstract: Provided is a BrushLess Direct Current (BLDC) motor system including a motor driving circuit configured to control a pulse-width-modulation (PWM) inverter in a first operation mode or a second operation mode according to a control signal, and output a switching signal according to each operation mode, the PWM inverter configured to receive the switching signal to output first three-phase voltages having a first frequency in the first operation mode, and output second three-phase voltages having a second frequency in the second operation mode, a sensorless BLDC motor configured not to operate in the first operation mode by operating based on three-phase voltages having a frequency in a different band from the first frequency, and operate in the second mode by operating based on three-phase voltages having a frequency in an identical band to the second frequency, and a parameter detecting circuit configured to calculate parameter information on the sensorless BLDC motor in the first operation mode by using sens

Abstract: Embodiments of the present invention relate to methods, systems and apparatus for controlling operation of a multi-phase machine in a motor drive system. The disclosed embodiments provide a mechanism for adjusting modulation index of voltage commands to improve linearity of the voltage commands.

Abstract: A motor control apparatus includes: a PWM rectifier which converts an AC power to a DC power; an LCL filter provided between the AC power supply and the PWM rectifier; a cooling fan for cooling the LCL filter; a temperature detection unit for the LCL filter; an alarm detection unit for detecting an alarm state when a temperature detection value is a predetermined value or more; a time measurement unit for measuring elapsed time from a start of a normal operation of the PWM rectifier; and a protection unit which determines, in accordance with the elapsed time, an alarm generation cause whether the alarm state is generated due to a reverse connection of a power line of the LCL filter or due to a stop of the cooling fan when the alarm state is notified, and performs a protection operation in accordance with the alarm generation cause.

Abstract: A trashcan assembly can include a body portion, a lid portion pivotably coupled with the body portion, and a sensor assembly configured to generate a signal when an object is detected within a sensing region. The sensor assembly can include a plurality of transmitters having a first subset of transmitters and a second subset of transmitters. A transmission axis of at least one transmitter in the first subset of transmitters can be different from a transmission axis of at least one of the transmitters in the second subset of transmitters. An electronic processor can generate an electronic signal to a power-operated drive mechanism for moving the lid portion from a closed position to an open position, such as in response to the sensor assembly detecting the object.

Abstract: A refrigerant compressor includes an electric motor. A current sensor measures current flow to the electric motor. A switching device is configured to close and open to allow and prevent current flow to the electric motor, respectively. A maximum continuous current (MCC) device includes a stored digital value corresponding to a maximum continuous current for the electric motor. A motor protection module: communicates with the MCC device, the current sensor, and the switching device; determines a first MCC for the electric motor as a function of the stored digital value received from the MCC device; selectively sets a predetermined MCC to the first MCC; and controls the switching device based on a comparison of the current flow to the electric motor and the predetermined MCC.

Abstract: A method and apparatus using electromagnetic switching in a two-step connection process is provided to minimize surge currents and torque oscillations in three-phase motors during starts.

Abstract: An electric drive system includes a smoothing capacitor including at least one terminal, a bus bar electrically coupled to the at least one terminal, a thermoelectric device including a first side and a second side positioned opposite the first side, where the first side is thermally coupled to at least one of the at least one terminal and the bus bar, and a cooling element thermally coupled to the second side of the thermoelectric device, where the cooling element dissipates heat from the thermoelectric device.

Abstract: An integrated circuit includes a motor current input voltage-to-current (VI) converter that receives a motor current sensor voltage from a motor and a reference voltage to generate an output current related to a motor's current. A motor current calibration VI converter compensates for errors in the motor current input VI converter and generates a calibration output current based on the reference voltage, wherein the output current and the calibration output current are combined to form an estimate of the motor's current.

Abstract: A control device of a motor includes detection section that detect counter-electromotive voltages induced in coils by rotation of a rotor, a counter-electromotive voltage normalizing section that normalizes a value of the counter-electromotive voltage using a normalization coefficient according to a speed of the rotation of the rotor, and a rotor position specifying section that specifies the position of the rotor based on values of the counter-electromotive voltage normalized by the counter-electromotive voltage normalizing section.

Abstract: Embodiments of the disclosure provide an encapsulated compressor overload, an encapsulated compressor relay start, an encapsulated head pressure control switch and a wiring diagram for a circuit for air conditioning units which prevent gases from being ignited by means of encapsulating sparking components, use of solid-state switching devices, and/or wiring circuits in such a way that open contacts do not contain enough energy to produce a spark capable of igniting the atmosphere.

Abstract: When a control device of a motor controller simultaneously rotates a first DC motor and a second DC motor by controlling a first circuit, a second circuit and a third circuit, the second circuit is shared. Further, the control device controls each of switch elements of the shared second circuit by using pulse-width modulation. Accordingly, the drive of the first DC motor and the second DC motor can be controlled with high accuracy by the change of a duty ratio of each of the switch elements of the shared second circuit.

Abstract: A motor control apparatus includes a by-wire control circuit for sequentially switching an energized phase of a motor. The by-wire control circuit pre-stores a first table defining an energized phase address corresponding to each address and a second table defining an energized phase corresponding to each energized phase address. When receiving a drive permission code from a second control circuit, the by-wire control circuit switches the energized phase in a correct order of driving the motor, by calculating an address for access to the first table based on the drive permission code, calculating an energized phase address corresponding to the address by referring to the first table, and determining the energized phase corresponding to the energized phase address by referring to the second table.

Abstract: An apparatus and a method for generating a pulse width modulated, PWM, voltage doubler signal is presented The apparatus comprises a voltage source, a capacitor, an output node, a switchable circuit assembly for connecting the voltage source, the capacitor and the output node, and a controller for the switchable circuit assembly which is adapted to be switchable between a first circuit configuration in which the capacitor is connected in parallel to the voltage source so as to be chargeable by the voltage source, and a second circuit configuration in which the capacitor is connected in series between the voltage source and the output node, and wherein the control means is adapted to control the switchable circuit assembly to switch to the first circuit configuration in the first period, and to switch to the second circuit configuration in the second period.