Abstract: Disclosed is a device (1) for driving either rotation or translation of a shaft (2). It comprises an electric motor (3) that comprises a stator (4) and a single rotor (5) supporting the shaft (capable of being turned in two directions). Through an activatable/deactivatable system (9) which engages or disengages at least one element (71, 72), the device (1) is either in the first configuration for rotation of the shaft (2) or in the second configuration for a relative axial movement between shaft and static portions of the device (1). The single rotor (5) is a versatile rotor through selection between the first configuration or the second configuration.

Abstract: In an aspect, an actuator is provided and includes an axial flux motor and an epicycloid gear arrangement. The axial flux motor has a motor stator and a rotor, the rotor defining a rotor axis and having a motor output shaft. The motor output shaft has a first shaft portion that is coaxial with the rotor axis and a second shaft portion that is offset from the rotor axis. The epicycloid gear arrangement includes a ring gear, a cycloid gear, and a gear arrangement output member. The cycloid gear is rotatably mounted to the second shaft portion of the motor output shaft such that rotation of the motor output shaft drives the cycloid gear about the ring gear. The gear arrangement output member is driven rotationally by the cycloid gear about a gear arrangement output member axis that is fixed.

Abstract: A balance structure for connecting crossbars of a bicycle, the balance structure comprising a bicycle frame body, crossbars, and a driving device (700), wherein the driving device (700) comprises a rotor (500) and a stator (400); and a first crossbar (100) is connected to a second crossbar (101) or a frame by means of the stator (400), a housing of the stator (400), or a central shaft (710) of the driving device (700).

Abstract: The present invention discloses a power generation system to power a cryptocurrency mining operation. The system comprises at least one power producing module having at least one first hollow member and at least one second hollow member. The second hollow member is filled with fluid, for example, water. The system further comprises at least one conductive coil disposed over the second hollow member. The system further comprises at least one movable magnet disposed within the second hollow member and a magnetic flux field of the magnet is in contact with the conductive coil. The system is configured to generate energy when the magnetic flux field of the magnet passes through the conductive coil.

Abstract: An electric vehicle powered and recharged by multiple redundant independent kinetic energy charging systems to ensure extended operation of the vehicle. While driving, each kinetic energy charging system is responsive to wheel rotation for generating electricity for storage thereof at the vehicle. Redundant kinetic energy charging systems include: a Center Hub kinetic recharger system, a Rear Hub kinetic recharger system, and a Hubless Tire kinetic recharger system. The power generated from each charging system is routed to a smart charge combiner to combine generated electricity output and a smart ultracapacitor energy storage system that stores combined electricity output. The stored charge can power a vehicle battery or battery bank under control of a smart charge controller to extend an operating range of the vehicle without recharging. The ultracapacitor storage system is configured in a portable energy storage unit removable from the vehicle and adapted for delivering electricity to other devices.

Abstract: An apparatus may generate energy in response to a vehicle wheel rotation. The apparatus may include a roller, a shaft, and a generator. The roller may rotate in response to a movement or motion of the wheel and may apply a friction to the wheel to decrease a rotational velocity of the wheel. The shaft may rotate in response to a rotation of the roller. The generator may generate an electrical output based on rotation of the shaft and convey the electrical output to an energy storage device or to a motor of the vehicle.

Abstract: A motor includes a motor housing, a fixed impeller, an air cover, a movable impeller, an outer cover and a motor body. The motor housing has a first accommodating chamber. The air cover has a second accommodating chamber. The motor is further provided with a heat dissipation channel communicating with the first accommodating chamber and the second accommodating chamber. The motor housing is also provided with a first air inlet communicating with the first accommodating chamber. When the movable impeller rotates, the negative pressure generated by the movable impeller causes the air to flow in from the first air inlet, sequentially flow through the first accommodating chamber, the heat dissipation channel and the second accommodating chamber, and then be discharged.

Abstract: An electric oil pump comprises a stator assembly and an electronic control panel assembly which are electrically connected. The electronic control panel assembly comprises an electronic component. The electric oil pump further comprises a conductive pump housing and a conductive member that electrically connects a reference ground layer of the electronic control panel assembly and the pump housing. The above arrangement facilitates reducing electromagnetic radiation of the electronic control panel assembly, thereby reducing interference of the electromagnetic radiation of the electronic control panel assembly on the electronic component and/or other external devices.

Abstract: A method of manufacturing a stator for a rotary electric machine. The stator includes a stator core and coil segments including protruding portions that are twisted by a first twist angle, except small-twisted protruding portions which are ones of the protruding portions and which are twisted by a second twist angle that is smaller than the first twist angle. The method is executed by using a tubular-shaped tool having engaging grooves having a first groove width, except small-twisting engaging grooves which are ones of the engaging grooves and which have a second groove width that is larger than the first groove width. The tubular-shaped tool is spirally rotated relative to the stator core, with the protruding portions being inserted in the engaging grooves except the small-twisted protruding portions that is inserted in the small-twisting engaging grooves, whereby the protruding portions including the small-twisted protruding portions are concurrently twisted.

Abstract: A method for manufacturing a rotor for an electrical machine having a rotor support and a laminated core includes positioning the laminated core on a first component of the rotor support, where the laminated core at least partially radially encloses the first component relative to an axis of rotation of the electrical machine. The method further includes welding an axial end face of the first component of the rotor support with a second component of the rotor support to form the rotor support by friction welding, where the laminated core is fixed on the rotor support by fastening elements which respectively enclose the laminated core on both sides of the laminated core in an axial direction. At least one of the fastening elements is formed by a weld bead.

Abstract: A method and apparatus for forming a rotor for an electric machine includes serially adding layers of material to form a rotor body having a radially-extending post configured to receive a set of electrically-conductive windings, and also having a radially-extending winding end turn support formed contiguously from the rotor body.

Abstract: A driving unit and a linear compressor including the same are provided. The driving unit includes an inner stator, a bobbin surrounding the inner stator in a circumferential direction, a coil wound on the bobbin, a plurality of stator cores surrounding the bobbin and spaced apart from each other in the circumferential direction, and a plurality of permanent magnets disposed between the inner stator and the plurality of stator cores. A cross section of the bobbin may include a pair of straight portions facing each other and a curved portion connecting the pair of straight portions.

Abstract: A DC three-phase DC motor comprising disc coils having 12 independent windings, a rotor, disc-shaped stators, and an electronic control system. Independent windings form three separate phases, connected by switch circuits in three quadruple rows. Rotor having a circular array of electromagnetic coils; wherein the axis is parallel to the shaft. The electronic control system replaces the brush (charcoal) and the commutator to supply energy to the magnetic coils for pushing or pulling the electromagnetic magnets. By using three separate rows of four quadrants and removing the brush system (charcoal) and commutator, the simultaneous power distribution in the three-phase motor is provided by the electronic control circuit, and also effective torque is produced.

Abstract: The invention relates to an electric machine comprising a permanent magnet arrangement and an electromagnetic arrangement. The electromagnetic arrangement comprises a first number of excitation coils, each excitation coils being wound around a pole core. The permanent magnet arrangement comprises a second number of magnet segments formed of a permanently magnetic material. An air gap is arranged between the electromagnet arrangement and the permanent magnet arrangement. The magnet segments have a permanent magnetisation in a first magnet segment volume. At least one magnet segment comprises a demagnetised region in a second magnet segment volume.

Abstract: An oscillatory actuator 1 includes: an in-case electromagnetic driver 3; a mover 4; and a pair of leaf springs 5a and 5b for supporting the mover 4. The mover 4 includes a magnet 30, pole pieces 31a and 31b paired, and masses 32a and 32b paired. The in-case electromagnetic driver 3 includes coils 21a and 21b paired and a tubular yoke 20 radially outside the coils 21a and 21b, the yoke being made of a soft magnetic material and projecting outward beyond the coils 21a and 21b along the oscillation axis O. Along the oscillation axis O, an average length Ly of the yoke O is equal to or longer than the sum of an end-to-end length Lp of the pole pieces 31a and 31b paired and the double of a one-way amplitude La of an oscillation of the mover 4, i.e., Ly>the sum (Lp+2La).

Abstract: An electric motor has a stator mechanically coupled to the rotor by a nutating traction interface, such that during nutation of the rotor with respect to the stator a tilt axis of the rotor progresses about the axis of rotation of the output shaft. The rotor and a surface of the stator bound a dynamic gap across which a magnetic field is produced by electrical activation of the motor to generate a force between the rotor and the stator. The traction interface and the gap are arranged such that, in a plane containing the axis of rotation of the output shaft, the traction interface is angled with respect to the stator surface bounding the gap. The rotor is connected to the output shaft by a tiltable connection such as a gimbal.

Abstract: A novel magnetic engine, multifunctional, movable, customizable, convertible, scalable; housed magnetic engine; comprising of an interior offset magnetic rings mounted at the optimal distance and angle, with facing poles for the inner and outer rings to force constant flow, creating a forceful spin onto the drive shaft holding the magnetic plates into the housing; enveloped in a magnetic shielding, a glide mechanism will be used to extract the inner rings from the housing to stop the engine when needed, offering a flexible use and adaptation for need. Novel flexibility to be used as a home generator or to power anything needing constant motion with the desire of reduction in other energy sources, limitless applications in adaptation, scalable design also increases the flexibility in the use.

Abstract: A chain-link converter includes a number of series-connected chain-link modules. Each chain-link module has a module controller that is programmed to control operation of the corresponding chain-link module to selectively provide a voltage source, whereby the chain-link converter is able to provide a stepped variable voltage source. The chain-link converter also includes a chain-link converter controller that is arranged in communication with each module controller, and which is programmed to, in-use, communicate to a nmber of the module controllers a measured converter current (IDC) that is flowing through the chain-link converter. The module controllers that receive the measured converter current (IDC) is each further programmed, in-use, to combine the measured converter current (IDC) with a measured rate of change of current (IAC) flowing through the corresponding chain-link module, to establish an instantaneous module current (Ii) that is flowing through the corresponding chain-link module.

Abstract: A power converter system may include a first power converter configured to couple via its input to a power source and configured to convert an input voltage provided by the power source to an intermediate voltage, a second power converter coupled via its input to an output of the first power converter and configured to convert the intermediate voltage to a regulated output voltage, a capacitor coupled at one of its terminals to an electrical node of the intermediate voltage. Based on one or more electrical parameters of the power converter, the second power converter is controlled to regulate the regulated output voltage at a substantially constant level and the first power converter is controlled to control the intermediate voltage to maintain the intermediate voltage between a maximum voltage and a minimum voltage and regulate an input current drawn from the power source at a substantially constant level.

Abstract: In a controller for a power converter, a switching frequency of a switching element is determined on the basis of at least one of a magnetic parameter of a magnetic component and an electric parameter of the power converter, and the switching frequency changes stepwise in each of M intervals on the basis of one of a predetermined time width and a predetermined electric quantity width, M being an integer not less than 2. A control frequency is a value obtained by dividing the switching frequency by an integer P not less than 2.

Abstract: The present disclosure relates to a method for operating a converter. The converter comprises a first and second input terminal for receiving a DC voltage, an output terminal for providing an output voltage variable between a first voltage level and a second voltage level, a first and second series connection of two or more switches that are semiconductor switches, and one or more capacitor units. The method comprises the following operation: compensating different power losses of the switches by controlling the switches such that one or more of the one or more capacitor units are charged above a respective third voltage level, and/or that one or more of the one or more capacitor units are charged below a respective third voltage level, so that the DC voltage is not equally distributed to the switches.

Abstract: The present invention belongs to the technical field of gate driving circuits, and discloses a partially bootstrapped gate driving circuit for reducing switching loss and a control method thereof. The partially bootstrapped gate driving circuit for reducing the switching loss comprises a switching device, PWM, a power supply, signal isolation, non-isolated driving chips, a bootstrap structure, a driving resistor, Mon and Moff. The bootstrap structure is used in the present invention, which can realize voltage doubling output without increasing the power supply, overcomes limitation of parasitic resistance inside a large gate of a wide band gap device, and can significantly reduce the switching loss.

Abstract: An electrical converter may include AC terminals, a first and second DC terminal, and converter modules. Each of the converter modules has an AC node. The second DC terminal forms a common node of the converter modules. A connection between the AC nodes of the converter modules and the AC terminals is reconfigurable allowing the electrical converter to operate according to a first mode of operation converting between a first AC signal having a first plurality of phase voltages and the DC signal, in which the converter modules are grouped in first groups, and according to a second mode of operation converting between a second AC signal having a single-phase voltage and the DC signal, in which the converter modules are rearranged in second groups. The electrical converter is configured to operate multiple converter modules assigned to a same group of the first groups and the second groups in parallel.

Abstract: A power factor correction circuit configured to increase the amount of useful power in an AC electrical system. The power factor correction circuit optionally includes one or more capacitors and one or more resistors configured to realign a phase angle between a voltage and current of an AC power source. Examples are offered illustrating the disclosed circuit in use with a single phase or multi-phase AC power source ranging in voltage from 100 volts or less to 500 volts or more.

Abstract: A power converter includes first to fourth switches, a flying capacitor, an inductor, an output capacitor and a control circuit. The first to fourth switches are sequentially coupled in cascode. The first switch is used to receive an input voltage. The flying capacitor is coupled across the second switch and the third switch, the inductor is coupled to the second switch, the third switch and the output capacitor. The output capacitor is used to output an output voltage. When the input voltage is less than an input voltage threshold, the control circuit is used to switch the first to fourth switches according to a resonant frequency. When the input voltage exceeds the input voltage threshold, the control circuit switch is used to the first to fourth switches according to a regulated frequency exceeding the resonant frequency.

Abstract: A power converter includes first to fourth switches, a flying capacitor, an inductor, an output capacitor and a control circuit. The first to fourth switches are sequentially coupled in cascode. The first switch receives an input voltage, and the fourth switch is further coupled to a ground terminal. The flying capacitor is coupled across the second switch and the third switch, the inductor is coupled to the second switch, the third switch and the output capacitor. The output capacitor is used to output an output voltage. In a non-regulated mode, the control circuit switches the first to fourth switches according to a resonant frequency. In a regulated mode, the control circuit switches the first to fourth switches according to a regulated frequency exceeding the resonant frequency. When the flying capacitor is coupled to the inductor, the flying capacitor and the inductor can form a resonant circuit having the resonant frequency.

Abstract: Systems and methods are provided for regulating a power conversion system. An example system controller includes: a detection component configured to receive an input voltage related to a diode connected to an inductor and output a first signal at a first logic level in response to the input voltage being larger than a predetermined threshold, a control logic component configured to receive the first signal, process information associated with the first signal, and output a modulation signal related to a modulation frequency in response to the first signal being at the first logic level, and a driving component configured to receive the modulation signal and output a drive signal to open and close a first switch at the modulation frequency.

Abstract: A switching charger having fast dynamic response for transition of a load is provided. A first terminal of a high-side switch is coupled to an input voltage. A first terminal of a low-side switch is connected to a second terminal of the high-side switch. A first terminal of an inductor is connected to a node between the first terminal of the low-side switch and the second terminal of the high-side switch. A second terminal of the inductor is connected to a first terminal of a capacitor. A constant on-time circuit determines a duty cycle of an on-time signal according to the input voltage and an output voltage of a node between the second terminal of the inductor and the first terminal of the capacitor. A control circuit controls a driver circuit to drive the high-side switch and the low-side switch according to the on-time signal.

Abstract: In a multi-level hybrid DC-DC converter with a flying capacitor, a feedback circuit includes a first oscillator and produces a first clock signal with a frequency dependent on an output voltage. A second oscillator produces a second clock signal having a frequency dependent on a reference voltage. A logic circuit switches, as a function of the first and second clock signals, connection of the flying capacitor between one state where the flying capacitor is connected between an input node and a switching node, and another state where the capacitor is connected between the switching node and a ground node. The duty cycle of the first/second clock signal varies so that when the flying capacitor voltage is lower than a target voltage a duration of the one state is increased, and when the flying capacitor voltage is higher than the target voltage a duration of the another state is increased.

Abstract: A boost converter includes a bridge rectifier, a first capacitor, a supply circuit, a first inductor, a current compensation circuit, a power switch element, an output stage circuit, a feedback compensation circuit, and an MCU (Microcontroller Unit). The bridge rectifier generates a rectified voltage according to a first input voltage and a second input voltage. The first inductor receives the rectified voltage. The output stage circuit is coupled to the first inductor and the current compensation circuit, and generates an output voltage. The feedback compensation circuit generates a feedback voltage according to the output voltage. The MCU monitors and limits a duty cycle of a clock voltage. If the duty cycle reaches a maximum threshold value, the MCU will enable the current compensation circuit to provide an additional current, thereby increasing the output power of the boost converter.

Abstract: An embodiment of the present disclosure provides a voltage converter including: an inductor in which a first electrode thereof receives an input voltage and a second electrode thereof is connected to a first node; a first transistor in which a first electrode thereof is connected to the first node and a second electrode thereof is connected to a second node providing an output voltage; a second transistor in which a first electrode thereof is connected to the first node and a second electrode thereof is connected to a reference terminal; and a current sensor connected to the first node and the second node, wherein the current sensor includes: a third transistor in which a first electrode thereof is connected to the first node and a second electrode thereof is connected to a third node; and a current mirror circuit that mirrors currents flowing through the second node, the third node, and a sensing terminal.

Abstract: A power supply phase doubling system includes a pulse width modulation (PWM) controller and first and second phase doubling chips. The PWM controller outputs a PWM signal. The first phase doubling chip is operated at a power supply voltage and has a first PWM output pin to generate a first control signal and a second control signal according to the PWM signal, and generates a first output signal according to the first control signal. The second phase doubling chip is operated at the power supply voltage, has a second PWM output pin, and is configured to generate a second output signal according to the second control signal. The first and second phase doubling chips are respectively switched between a master mode and a slave mode according to a voltage level of the first PWM output pin and a voltage level of the second PWM output pin.

Abstract: An integrated circuit (IC) control device for a multi-phase switching converter having a master phase and at least one slave phase, has a first ON-time control circuit to provide a first ON-time control signal and at least one slave ON-time control circuit. Each slave ON-time control circuit has a closed-loop gainer to provide a gain by executing proportional integral to a difference between a master phase temperature and a slave phase temperature, a multiplier to provide a current feedback signal by multiplying a slave current signal with the gain, a bias circuit to provide a bias by executing proportional integral to a difference between a master phase current and the current feedback signal, and an adder to provide a corresponding slave ON-time control signal by adding the first ON-time control signal to a bias ON-time control signal provided by a bias ON-time generator based the bias.

Abstract: A semiconductor package includes a transformer having a primary winding and a secondary winding. The primary winding has first and second terminals and a pair of taps. The secondary winding has first and second terminals and a pair of taps. The semiconductor package includes first and second data transfer circuits, a bridge, and a rectifier. The first data transfer circuit is coupled to the pair of taps of the primary winding. The second data transfer circuit is coupled to the pair of taps of the secondary winding. The bridge is coupled to the first and second terminals of the primary winding. The rectifier is coupled to the first and second terminals of the secondary winding.

Abstract: A power supply device and a control method for the same are disclosed. The method comprises: controlling, when there is the abnormal situation in the first input power supply, a first access point of a first relay and a third access point of the first relay to be disconnected, a second access point of the first relay and a fourth access point of the first relay to be disconnected, a common access point of a third relay and a second access point of the third relay to be connected, a common access point of a fourth relay and a second access point of the fourth relay to be connected, a first access point of a second relay and a third access point of the second relay to be connected, and a second access point of the second relay and a fourth access point of the second relay to be connected.

Abstract: A high voltage power system is disclosed. In some embodiments, the high voltage power system includes a high voltage pulsing power supply; a transformer electrically coupled with the high voltage pulsing power supply; an output electrically coupled with the transformer and configured to output high voltage pulses with an amplitude greater than 1 kV and a frequency greater than 1 kHz; and a bias compensation circuit arranged in parallel with the output. In some embodiments, the bias compensation circuit can include a blocking diode; and a DC power supply arranged in series with the blocking diode.

Abstract: A flyback circuit and a control method of a clamping switch of the flyback circuit are provided. The flyback circuit includes a transformer, a main switch, a clamping capacitor, a clamping switch, and a secondary rectifier unit. The transformer includes primary and secondary windings with a turns ratio of K. The main switch and the primary winding are connected in series to receive an input voltage. The clamping switch and the clamping capacitor are connected in series and then connected to the primary winding in parallel. The secondary rectifier unit and the secondary winding are connected in series to provide an output voltage to a load. The control method includes: when a product of K and the output voltage is greater than or equal to the input voltage, controlling the clamping switch to turn on M times during N consecutive switching cycles of the main switch, where 1=<M<N.

Abstract: An electric power supply system includes an electric power storage device, a first relay provided between a first electric power line pair connected to the electric power storage device and a second electric power line pair connected to electrical equipment, a bidirectional electric power conversion device that is configured to be able to bidirectionally convert electric power between the second electric power line pair and an electric power facility outside of a vehicle, a first capacitor provided between the second electric power line pair, and a control device configured to execute first precharge processing of charging the first capacitor prior to turning on the first relay. The bidirectional electric power conversion device includes a switching device. The control device starts the first precharge processing when the bidirectional electric power conversion device is activated.

Abstract: A synchronous reverse blocking switch for a soft-switching current source converter (SSCSC), the switch comprising: a first controlled switch; a second controlled switch connected in series to the first controlled switch; and a delay generation circuit configured to control: the second controlled switch to turn on after a delay (t_dON) from the first controlled switch turning on, and the second controlled switch to turn off after a delay (t_dOFF) from the first controlled switch turning off.

Abstract: Disclosed examples include flyback converters, control circuits and methods to facilitate secondary side regulation of the output voltage. A primary side control circuit operates a primary side switch to independently initiate power transfer cycles to deliver power to a transformer secondary winding in a first mode. A secondary side control circuit operates a synchronous rectifier or secondary side switch to generate a predetermined cycle start request signal via a transformer auxiliary winding to assume secondary side regulation and to cause the primary side controller to initiate new power transfer cycles.

Abstract: A power conversion apparatus includes a rectification unit that rectifies a first alternating-current power supplied from a commercial power supply; a capacitor connected to output terminals of the rectification unit; an inverter that is connected across the capacitor, converts power output from the rectification unit and the capacitor into a second alternating-current power and, outputs the second alternating-current power to a load including a motor; and a control unit that performs operation control on the inverter to cause the second alternating-current power that includes a pulsation based on a pulsation of power that flows into the capacitor from the rectification unit to be output from the inverter to the load, to restrain a current that flows into the capacitor.

Abstract: The power conversion device includes: a power module; a plurality of capacitor elements each having an element body portion, a first electrode, and a second electrode; a first busbar connecting the first electrode and the power module; and a second busbar connecting the second electrode and the power module. The power module is disposed so as to be opposed to a side surface of the element body portion of only one of the capacitor elements. One or each of the first busbar and the second busbar has, as a connection member connecting the power module and a corresponding one of the first electrode or the second electrode to each other, an opposed plate-shape portion opposed only to an opposed portion of the side surface of the element body portion opposed to the power module.

Abstract: This power conversion device includes: a reactor, switching elements, a first capacitor, and a second capacitor provided between an AC power supply and a DC load; and a controller for controlling operations of the switching elements. The controller controls voltage of the first capacitor and voltage of the second capacitor to predetermined command values, while, in accordance with load information regarding the DC load, performing changeover between a first control method of controlling the switching elements at a constant switching frequency over an AC cycle of the AC power supply, and a second control method of controlling them at a frequency lower than the switching frequency in the first control method.

Abstract: An integrated circuit for a power supply circuit that generates an output voltage from an alternating current (AC) voltage, the power supply circuit including a transistor configured to control a current flowing through an inductor. The integrated circuit comprises: a first terminal, to which a first capacitor is coupled, that receives a voltage corresponding to the AC voltage; a driver circuit turns on the transistor in response to a predetermined condition being satisfied, and turns off the transistor based on a feedback voltage corresponding to the output voltage and the voltage corresponding to the AC voltage, an ON period of the transistor inversely correlating to a level of the voltage corresponding to the AC voltage; and a discharge circuit that discharges the first capacitor in a time period from a first timing at which the transistor is turned off to a second timing at which the transistor is turned on.

Abstract: An electric circuit arrangement includes at least one half bridge including two power switching elements, two driver circuits, and a discharge control circuit, wherein the half bridge is in parallel with an energy accumulator and each power switching element has a switchable section with an electric resistance that is adjustable by a control voltage at a control input of the power switching element, while in a normal operation of the power switching elements, the drivers circuits generates the control voltage at the control input of each power switching element, and, while in at least one discharge operation that discharges the energy accumulator, the discharge control circuit generates a discharge voltage as the control voltage as the control input of at least one of the power switching elements, the discharge voltage placing the at least one of the power switching elements in linear operation.

Abstract: A control apparatus for a power receiver which wirelessly receives electric power from a power transmitter. The control apparatus being configured to execute a restriction process that restricts received power by PWM control depending on an amount of the received power. The restriction process comprises calculating an increase gap which is a difference between an initial received power and a local maximum value of the received power with respect to a change in a duty in the PWM control, starting the PWM control when a first value which is a value obtained by adding the increase gap to a current received power exceeds a second value which is a value obtained by subtracting a predetermined margin from an upper limit of the received power, and increasing the duty until the received power becomes lower than the initial received power when starting the PWM control.

Abstract: A vibration power generation device includes a weight, beams, piezoelectric members, and a fixation member. The beams extend from the weight in directions parallel to a single plane. The piezoelectric members are disposed at respective beams. The fixation member includes at least a frame-shaped portion. The beams are fixed to the frame-shaped portion in such a manner that the weight and the piezoelectric members are positioned inside the frame-shaped portion.

Abstract: A method for operating an appliance motor includes receiving a target speed for the motor, obtaining a power limit for the motor, determining an inverter current limit based at least in part on the target speed and the power limit, determining an inverter output current to achieve the target speed, wherein the inverter output current is limited to the inverter current limit, and supplying the motor with the inverter output current.

Abstract: A motor control device controls a motor, which is driven by three-phase alternating currents and to which a magnetic pole position sensor measuring a magnetic pole position of a rotor is attached, using a detection value of a rotation angle of the motor based on a measurement result of the magnetic pole position by the magnetic pole position sensor, compares a peak-current-time rotation angle representing the detection value of the rotation angle at a peak of a current value of a target phase and a reference rotation angle representing the rotation angle at a peak of a predetermined current waveform of the target phase using any one phase of the three-phase alternating currents during a three-phase short circuit of the motor as the target phase, and corrects the detection value of the rotation angle based on a result of the comparison.

Abstract: The present disclosure provides a rotatable drawing board and a control method. The rotatable drawing board includes a main case and an axially rotatable drawing board body arranged on a front surface of the main case; a control circuit board and a drive motor for driving the drawing board body to axially rotate are arranged inside the main case; an output shaft of the drive motor is connected to a central portion of the drawing board body, or a supporting rod extending into the main case is arranged at a central portion of a back surface of the drawing board body; the output shaft of the drive motor is rotatably movably connected to the supporting rod to drive the supporting rod and the drawing board body to axially rotate; and the drive motor is electrically connected to the control circuit board.