Abstract: In a method for the production of a rotary permanently excited electrical machine, a magnet body of magnetizable but not yet magnetized material is secured in or on a rotor body of a rotor such that the magnet body is arranged in a region of pole yet to be formed. An electrical conductor is arranged around the pole yet to be formed and the rotor body is fastened on a rotor shaft. The rotor shaft, including the rotor body with the magnet body and the electrical conductor, is mounted in a subsequent operating position relative to a stator. A pulse current is applied to the electrical conductor after mounting of the rotor shaft to thereby form the pole of the rotor as the magnet body is magnetized, and ends of the electrical conductor are electrically connected to one another after formation of the pole of the rotor.

Abstract: A motor includes a rotor, a stator including coils defined by windings of coil wires, a coil support into which the coil wires are inserted, a bearing supporting the shaft, a holder with a through-hole that holds both the bearing and the coil support. The coil support includes a base on the top surface of the stator, and a coil support portion extending axially upward from the base, at least a portion of which is located in the through-hole. The base is fitted to the stator through a gap.

Abstract: The invention relates to an impregnation device (1) for trickle impregnation of a stator (2) or armature of an electric machine with a synthetic resin (5) curing under temperature increase, comprising a holding device (32) which can be tilted vertically relative to the horizontal (16) and to which a drive motor (12) is attached as a rotary drive for the stator (2) or the armature, a drive shaft (58) operatively connected to the drive motor (12), a clamping device (34) which is non-rotatably connected to the drive shaft (58) and capable of detachably connecting the stator (2) or the armature to the drive shaft (58), a trickle device (24) capable of applying a synthetic resin (5) onto at least one axial end of the windings (4) of the stator (2) or the armature, and a heating device capable of heating the windings (4) of the stator (2) or the armature to a trickle temperature and to a comparatively higher curing temperature.

Abstract: The invention relates to a method for trickle impregnation of a stator (2) or armature of an electric machine with a synthetic resin (5) curing under temperature increase, comprising the following steps: a) heating the stator (2) or the armature from an initial temperature (T1) to a trickle temperature range (T2-T3) of the synthetic resin (5), which is initially still liquid, in a first period of time (t0-t1), b) keeping constant the temperature in the trickle temperature range (T2-T3) and introducing the synthetic resin (5), which is still liquid, into the stator (2) or the armature in a second period of time (t1-t2), c) heating the stator (2) or the armature to a curing temperature range (T4-T5) in a third period of time (t2-t3), d) keeping constant the temperature of the stator (2) or the armature in the curing temperature range (T4, T5) in a fourth period of time (t3-t4) and setting and curing the synthetic resin (5) to a duroplast, and e) cooling down the stator (2) or the armature after the end of the f

Abstract: An electric machine has a stator, which has at least one first magnet and at least one second magnet, and a rotor, which can be driven by the magnets and can rotate about an axis of rotation relative to the stator. The first magnet is held on a first ring and the second magnet is held on a second ring following the first ring in the axial direction of the electric machine. The second ring can, together with the second magnet, rotate about the axis of rotation relative to the first ring and the first magnet.

Abstract: An actuator is provided. In order to reduce the planar area of an actuator, a first magnetic drive circuit and a third magnetic drive circuit that vibrate a movable body in an X direction with respect to a support are provided respectively on both sides, in a Z direction, of a second magnetic drive circuit that vibrates the movable body in a Y direction with respect to the support. The movable ranges, in the X direction and the Y direction, of the movable body with respect to the support are regulated by a stopper mechanism constituted between a first magnet and a first coil holder holding a first coil, a stopper mechanism constituted between a second magnet and a second coil holder holding a second coil, and a stopper mechanism constituted between a third magnet and a third coil holder holding a third coil.

Abstract: An electromagnetic actuator includes: a rotor assembly, including an inner pipe and at least one magnet accommodated in the inner pipe; a stator assembly, sleeved over the rotor assembly; and at least one elastic member, located at one end of the rotor assembly. The stator assembly includes an outer pipe made of metal and sleeved over the inner pipe and at least one coil fixed outside the outer pipe. The coil applies a driving force to the magnet, and the magnet drives the entire rotor assembly to move along an extending direction of the outer pipe. An outer diameter of the inner pipe is less than an inner diameter of the outer pipe, and a shape of the outer pipe is identical to a shape of the inner pipe.

Abstract: An actuator is provided. In the actuator, a first magnetic drive circuit and a third magnetic drive circuit that vibrate a movable body in a second direction with respect to a support are provided respectively on both sides in a first direction. A second magnetic drive circuit that vibrates the movable body in a third direction with respect to the support is provided. The first magnetic drive circuit, the second magnetic drive circuit and the third magnetic drive circuit are arranged to be sequentially stacked from one side to the other side in the first direction.

Abstract: An actuator (1) is provided A substrate (15) held by a support (2) is provided with a total of six power supply electrodes (153) electrically connected respectively to both ends of a first coil (61) of a first magnetic drive circuit (6) that vibrates a movable body (3) in an X direction, both ends of a second coil (71) of a second magnetic drive circuit (7) that vibrates the movable body (3) in a Y direction, and both ends of a third coil (81) of a third magnetic drive circuit (8) that vibrates the movable body (3) in the X direction. An opening (110) that exposes the six power supply electrodes (153) is formed in a cover (11).

Abstract: The invention discloses a control system and a vibration control method for an LRA. The vibration control method comprises: providing an induction coil, the arrangement and the winding of the induction coil able to obtain an inductive voltage proportional to LRA vibration speed; generating a vibration signal according to inductive voltage and feeding back to a driver connected to the LRA to control the vibration of LRA; wherein the generated vibration signal satisfying the following: when induction voltage is lower than a low-speed threshold, the vibration signal causes the driver to apply a driving force in the same direction; when induction voltage is higher than a high-speed threshold, the vibration signal causes the driver to apply a driving force in the opposite direction; when induction voltage is between the low-speed threshold and the high-speed threshold, the vibration signal does not force the driver to apply force.

Abstract: A power converter controller includes a fractional valley controller configured to determine a target number of valleys of a resonant waveform at a drain node of a main switch, the target number of valleys corresponding to a desired off-time of the main switch, the fractional valley controller modulating an off-time of the main switch between two or more modulated off-times. The target number of valleys corresponds to a non-integer number of valleys of the resonant waveform at the drain node of the main switch. Each of the modulated off-times of the main switch corresponds to an integer number of valleys, and the two or more modulated off-times of the main switch has an average value that corresponds to the desired off-time.

Abstract: A ZVS boost converter can include a boost inductor coupled to a DC voltage bus, a main switch configured to selectively store energy from the DC voltage bus in the boost inductor and deliver the stored energy to a load, a synchronous rectifier, and a resonant circuit coupled across the main switch. The resonant circuit can allow for zero voltage switching of the main switch and the synchronous rectifier switch. The resonant circuit can be a series resonant RC circuit. The boost converter can be operated in a continuous current mode, with the main switch operated at a constant frequency with a variable duty cycle to maintain output voltage regulation and the synchronous rectifier operated complementarily to the main switch. The duty cycle of the main switch can be controlled using a current window controller. The ZVS boost converter may be incorporated in a power factor corrected AC-DC converter.

Abstract: An apparatus is disclosed for improving zero voltage switching (“ZVS”) of a converter circuit such as an active clamp flyback converter. The apparatus includes a first timing circuit acting as the TD(L?H) optimizer, which uses the zero-crossing of the auxiliary winding voltage directly to adaptively vary the dead time. A second timing circuit acting as the TD(H?L) optimizer adaptively varies the dead time with a simple piece-wide linear function as an approximation of the complex optimal equation. A third timing circuit acting as the TDM optimizer contains a charge-pump circuit that adaptively adjusts the ON time of the clamp switch based on the zero-voltage detection of switching node voltage and feed-forwards the input voltage signal to enhance tuning speed so that the correct amount of negative magnetizing current is generated to improve zero voltage switching.

Abstract: A power supply system is disclosed for powering the operation of a ventilation fan driven by a permanent magnet motor, the supply system having an electric converter comprising a first input terminal for receiving an input of alternating 5 current (AC), a second input terminal for receiving an input of direct current (DC) and an output terminal for providing an output for powering the operation of the permanent magnet motor, wherein said supply system is configured for providing said output from said input of alternating current (AC) as well as from said input of direct current (DC). Further is a ventilation system disclosed comprising a plurality of ventilation fans each comprising a permanent magnet motor which each is connected to such power supply system.

Abstract: An apparatus is provided for minimizing the peak power demand on an inverter in a power supply with one or more switched reactive loads comprising an AC semiconductor bypass switch connected in parallel with the inverter and a bypass control device. The bypass control device includes filters for selecting load current signals with specific frequencies of interest from the switched reactive loads; a signal processor for sampling and transforming the selected load current signals into frequency domain to identify frequency components of the selected load current signal; an amplitude detector for detecting peak current amplitudes of the identified frequency components of the selected load current signal; and a bypass driver.

Abstract: A power module included a plurality of normally-on semiconductor switches based on a wide bandgap substrate, the normally-on semiconductor switches connected in parallel; and a balancing unit including a capacitor and a balancing semiconductor switch connected in series, which are connected in parallel to the normally-on semiconductor switches.

Abstract: A power conversion circuit board (1) is a circuit board on which a power conversion circuit configured to convert a direct current into an alternating current is mounted. A low-voltage circuit (10b) to which a low voltage is applied and a high-voltage circuit (10a) to which a high voltage is applied are separately disposed in different areas on the same circuit board surface. Furthermore, part of wiring of the high-voltage circuit (10a) is formed on the circuit board surface, and the other wiring is constituted by a bus bar provided at a predetermined distance from the circuit board surface.

Abstract: A circuit includes a rectifier, a charge pump, and a clamp control circuit. The rectifier has an input configured to be coupled to an alternating current (AC) power source. The rectifier rectifies an AC signal from the AC power source to produce a rectified voltage on a first voltage node. The rectifier includes a first transistor coupled to a ground node and to the input. The first switch has a first control input. The charge pump is coupled to the first voltage node. The charge pump is configured to generate a second voltage on a second voltage node. The voltage regulator is coupled to the second voltage node. The clamp control circuit is coupled to the first and second voltage nodes and has an output node coupled to the first control input.

Abstract: A voltage regulator utilizes a non-invasive sensing capacitor in differentially sensing a current indicative of current of an output capacitor of the voltage regulator. Some embodiments utilize current mirrors and an inverter for determining if the current indicative of current of the output capacitor is above or below a particular magnitude. Some embodiments utilize information indicative of output capacitor current in determining duty cycle for a switching voltage regulator, and some embodiments utilize the information in activating transient control circuitry.

Abstract: A power converter for converting an input voltage at an input port into an output voltage at an output port of the power converter is described. The power converter comprises an inductor having a first inductor port and a second inductor port, wherein the second inductor port is coupled to the output port. Furthermore, the power converter comprises a flying capacitor having a first capacitor port and a second capacitor port, and a switching cell. In addition, the power converter comprises a control unit to operate the switching cell in a first sequence of operation phases to perform step-up conversion; and in a second sequence of operation phases to perform step-down conversion.

Abstract: In a power conversion system, if data communication between first to third control circuits is normal, then a ring-shaped first communication path is formed by the first to third control circuits and first communication lines of first to third communication cables, and a ring-shaped second communication path is formed by the first to third control circuits and second communication lines of the first to third communication cables. For example, if the data communication between the first and second control circuits is abnormal, a ring-shaped third communication path is formed by the first and second communication lines of the second and third communication cables and the first to third control circuits.

Abstract: A flyback converter having a transformer that includes a primary coil connected to the input terminal and a secondary coil, a semiconductor switch configured to switch current flow through the primary coil, a first measurement unit configured to measure the DC input voltage, and a second measurement unit configured to measure a voltage across the semiconductor switch. The flyback converter also includes a control unit having a synchronization terminal and configured to output a switching signal to the semiconductor switch with a constant frequency in accordance with a synchronization signal input to the synchronization terminal. In addition, the flyback converter includes a frequency adjustment unit configured to transmit a synchronization signal to the synchronization terminal based on the DC input voltage and the voltage measured by the second measurement unit such that the frequency of the switching signal output from the control unit becomes variable.

Abstract: A power transformation system that is constructed and arranged to transform power from one or more primary voltage nodes to a separate secondary voltage node using one or more columns comprised of a plurality of capacitive modules each of which is capable of being either electrically inserted into the column or electrically isolated and electrically bypassed. There is a secondary voltage node, at a non-ground potential, to which a first end of the column is electrically connected. In the two-primary node example there are two high voltage switches, each in series with a reactor; one high-voltage switch adapted to electrically connect a second end of the column to the first primary voltage node and the other high-voltage switch adapted to electrically connect the second end of the column to a second primary node.

Abstract: In a power conversion device, cable connection positions of connections in which a plurality of bus bars is respectively connected to external line cables are non-overlapping with each other as viewed from a side on which the external line cables are pulled out.

Abstract: According to one disclosed embodiment, a smart power delivery system includes a power conversion unit having a communication module and a power management module that can convert mains power into an optimized voltage and limited current used to power an electronic device. In one embodiment, a power conversion unit can optimize an output voltage by communicating with a connected electronic device and exchanging parameters representing desired characteristics of the output voltage. In one embodiment, an electronic device receives power from a power conversion unit through a wired power conduit. In another embodiment, an electronic device receives power from a power conversion unit through a wireless power conduit. In one embodiment, an optimal voltage is selected after negotiation between multiple electronic devices and a power conversion unit.

Abstract: A system includes a clamp circuit configured to regulate a converter input supply voltage based on control signals. The system also includes a converter configured to the adjust the converter input supply voltage to a converter output supply voltage. The system also includes a controller configured to adjust the control signals for the clamp circuit using a first mode based on the converter output supply voltage and a second mode based on the converter input supply voltage.

Abstract: A safety shut-down system for a solar energy installation includes a DC to AC inverter converting DC power from a photovoltaic solar array to AC power and generating remote control signals to enable or disable the flow of DC power from each individual photovoltaic panel or string of panels to a photovoltaic output circuit. One or more manual switches, one of which may be at a service entrance for electrical power to the installation, are operative to cause the DC to AC inverter to disable all DC power from the photovoltaic solar array; this also occurs when the DC to AC inverter is shut off. A storage battery may selectively receive DC power from one or more photovoltaic panels or strings of panels for charging. The DC to AC inverter may generate AC power from the battery when the photovoltaic solar array is disabled.

Abstract: A power converter includes: an inverter that includes an upper arm element and a lower arm element, and converts electric power supplied from a DC power source via a power wiring so as to supply the electric power to a load; a driver that receives electric power supplied from the DC power source via a control wiring, and applies gate voltage to the upper arm element and the lower arm element; and a controller that includes a drive controller controlling operation of the upper arm element and the lower arm element in accordance with a current command value.

Abstract: A capacitive alternator is disclosed. The capacitive alternator includes a frame with a shaft rotatably coupled to and extending through the frame. The capacitive alternator includes a stator housed within the frame. The stator includes a plurality of stator electrodes arranged in respective first and second stator assemblies. The stator electrodes in the respective stator assemblies are in electrical communication with one another. The capacitive alternator includes a rotor supported on and fixedly attached to the shaft such that a rotation of the shaft causes a corresponding rotation of the rotor. The rotor includes a dipole assembly, including a first dipole electrode, and a second dipole electrode. The first and second dipole electrodes are electrically isolated from one another, from the shaft, and from the stator electrodes. The dipole assembly is rotatable relative to one of the plurality of stator electrodes.

Abstract: A piezoelectric motor may include a stator, a rotor rotating about a rotational axis and at least one piezoelectric element driving the rotor and maintained by the stator. Mechanical reliability and performance levels of a piezoelectric motor may be increased in that the at least one piezoelectric element may be mounted in an oscillating housing that oscillates with respect to the stator about the pivot axis.

Abstract: A theft deterring system includes a power tool with a motor connectable to a power source, a switch connected to the motor, a controller controlling to the switch for controlling an amount of power provided to the motor, and a state circuit having a memory for storing a state value. The controller activates the switch to provide power to the motor when the state value stored in the memory equals a desired value. The system may also include a tag programmer for changing the stored value.

Abstract: A power conversion apparatus and a power conversion system that ensure safety capable of reliably performing an emergency stop and have a failure monitoring function are provided. The command signal for emergency stop of the power conversion apparatus between the supervisory monitoring and control device and the power conversion apparatus is to be a dual system, and the supervisory monitoring and control device monitors a performance of emergency stop of the power conversion apparatus by delaying the start of operation for a predetermined time from the operation command signal output. The supervisory monitoring and control device check a soundness of the power conversion apparatus by generating a test operation signal during that delay period.

Abstract: An electric motor comprising: a stator; a rotor having a magnet mounted thereto; an electric circuit comprising a plurality of phases or windings for driving rotation of a rotor, in a drive mode; and a controller configured to control the electric circuit, in a motor braking mode, to short at least one of said phases or windings such that the magnet is able to generate a braking current in the shorted phase or winding wherein the motor is configured to operate at a rated current in the drive mode and to have a reactance such that the amplitude of the braking current is the same or lower than the amplitude of the rated current.

Abstract: A motor control device includes an inverter configured by a plurality of arms, a smoothing means supplying a direct-current voltage to the inverter, a shunt resistor inserted between a lower-arm switching element for each phase of the inverter and a negative-electrode side of the smoothing means, a master motor current sensor outputting a voltage according to a current flowing in a first motor connected in parallel to the inverter, and a computing unit generating driving signals for a plurality of switching elements based on an output of the master motor current sensor and an output corresponding to a voltage drop on the shunt resistor.

Abstract: A motor driver device includes: a detector that detects a polarity inversion timing of a current flowing through a coil of a predetermined phase of a motor; a drive control signal generator that generates a pulse-width-modulated or pulse-density-modulated drive control signal for each phase based on the detection result; and a drive voltage supply that supplies a drive voltage corresponding to the drive control signal to a corresponding coil, wherein the drive control signal generator includes a prediction processor configured to set a detection prediction interval based on two or more previously detected polarity inversion timings, and executes a frequency variable control to set a variable target frequency to be higher in the detection prediction interval than outside the detection prediction interval, the variable target frequency being a frequency of the pulse-width-modulated drive control signal or a reciprocal of a minimum pulse width of the pulse-density-modulated drive control signal.

Abstract: The invention relates to a method and device for determining the position angle of a rotor (2) in an electric synchronous machine (1). The device is designed to comprise: a voltage generator (12) for generating electrical voltage pulses at angles in a coordinate system fixed in respect of the stator when the rotor (2) is stationary; a measuring device (14) for measuring any electrical current value returning to the electrical voltage pulses generated by the voltage generator (12); and a computing device (16), which is designed: —to store a current signal curve of the current values measured; —to generate a zero-mean current signal curve by shifting the current signal curve or the measured current values; —to compute an integral function (83) of the zero-mean current signal curve; and—to determine the position angle of the rotor (2) on the basis of the computed integral function (83).

Abstract: A power generation system (100, 200, 300, 400) is presented. The power generation system includes a prime mover (102), a doubly-fed induction generator (DFIG) (104) having a rotor winding (126) and a stator winding (122), a rotor-side converter (106), a line-side converter (108), and a secondary power source (110, 401) electrically coupled to a DC-link (128). Additionally, the power generation system includes a control sub-system (112, 212, 312) having a controller, and a plurality of switching elements (130, and 132 or 201). The controller is configured to selectively control switching of one or more switching elements (130, and 132 or 201) based on a value of an operating parameter corresponding to at least one of the prime mover, the DFIG, or the secondary power source to connect the rotor-side converter in parallel to the line-side converter to increase an electrical power production by the power generation system.

Abstract: A portable power generation system includes a power generation unit and a monitoring unit. The power generation unit is detachable from the wheeled occupant apparatus and includes a pivoting arm, a rotating gear, and a control unit. The rotating gear is in communication with the wheeled occupant apparatus and is configured to rotate upon movement of the wheeled occupant apparatus, such that rotation of the rotating gear induces an electrical power generation effect. The control unit is in communication with the rotating gear through the pivoting arm and regulates the storage and transmission of electrical power. The monitoring unit is in electrical communication with the power generation unit and dispenses electrical power and provides user data to a user.

Abstract: A method and apparatus for operating a converter system of a wind turbine for exchanging electrical power with an electrical supply grid at a grid connection point are provided. In the method and apparatus, the converter system is operated in a normal operating mode. An overload situation affecting the converter system is detected and operation of the converter system is changed to an overload operating mode when the overload situation is detected. An average switching frequency for generating an output current is reduced in the overload operating mode of the converter system in comparison with the normal operating mode, a higher load is permitted on the converter system, which may be in the form of an increased temperature or an increased output current, in the overload operating mode of the converter system for a predetermined maximum overload period.

Abstract: A power generation system having a permanent magnet generator and an electrical conversion system. The electrical conversion system can have an AC/DC converter and a DC/AC inverter. The AC/DC converter can be mounted on the permanent magnet generator within a common enclosure with the permanent magnet generator. One or more DC bus bars can transmit a DC current generated by the AC/DC converter to a second enclosure, which can have a DC/AC inverter to generate AC power.

Abstract: A control system for an electric motor comprises a controller which receives as an input a demanded motor current and produces at an output an intermediate voltage demand signal, a voltage demand signal correction means arranged to generate a voltage demand correction signal, and a combining means arranged to combine the intermediate voltage demand signal and the voltage demand correction signal to produce an actual voltage demand signal that is applied to the motor by pulse width modulation of the switches of a motor bridge driver. The correction signal compensates for unwanted non-linearities caused by interlock delays in the switching of the motor bridge switches.

Abstract: Provided is a method of controlling a permanent magnet generator, the method including: measuring mechanical noise of the generator; deriving two quantities indicative of an amplitude and a phase of an undesired harmonic of the measured noise; deriving, based on the quantities, a current to be injected in stator coils of the generator such as to reduce the undesired harmonic.

Abstract: A motor controller includes an inverter that drives a motor, an operation controller that controls the inverter according to a current command value, and a torque ripple compensation generator that adds a compensation value to compensate for a torque ripple in the motor to the current command value. The operation controller uses, as the current command value, a q-axis current command value indicating a q-axis current in a rotational coordinate system of the motor, and also uses, as the current command value, at least temporarily a d-axis current command value indicating a d-axis current in the rotational coordinate system, and the torque ripple compensation generator calculates a phase difference of the compensation value with respect to the q-axis current command value according to an equation using the q-axis current command value and the d-axis current command value as variables.

Abstract: In order to achieve the energy efficiency class IE4 defined in the IEC standard 60034, it is necessary to operate permanently excited synchronous machines directly on the mains. Because this is not readily possible, soft start devices may be considered as cost-efficient solutions. A method is described by which the initial rotor angle is defined, which can then be used by an encoderless start process. The fundamental concept is based on energizing in a defined direction. This is achieved in that solely two actuator phases are fired. A current space vector is thereby applied to the machine in a fixed direction and the machine is then aligned thereto. The successful alignment and a blocked motor can thus be recognized based on the profile of the stator current space vector.

Abstract: A motor controlling method includes a step of obtaining an armature magnetic flux, a resultant magnetic flux, a stator current, and a stator voltage, which are represented by a phasor, with respect to an ?-? fixed coordinate system or a d-q rotating coordinate system, a step of calculating an angle (?) between the stator current and the stator voltage, a step of calculating a torque angle (?) according to: ?=cos?1[(?m?s??mLIs sin(?))/(?s2+(LIs)2?2?LIssin(?))], where L is an armature inductance, ?m indicates a magnetic flux of a rotor magnet, ?s indicates a magnitude of the resultant magnetic flux, and Is indicates a magnitude of the stator current, and a step of controlling the surface permanent magnet motor based on the torque angle (?).

Abstract: A torque ripple and a position error caused by an offset error of the current sensor affects an electrical angle frequency of a motor. In an apparatus of the present disclosure, a computation device executes a power spectrum computing process when a three-phase alternating current motor is at a constant speed, and a value obtained by subtracting a position command value from a position detected by a position detector is fast Fourier transformed, to compute a power spectrum of a position error signal at the electrical angle frequency. Then, the computation device executes an offset correction computing process, to evaluate the power spectrum and to update an offset correction amount. By repeatedly executing these processes when the three-phase alternating current motor is driven at a constant speed, the torque ripple and position error caused by the offset error are reduced.

Abstract: A motor driving apparatus that drives a motor includes a controller that outputs a driving signal indicating a driving amount of the motor, a driver including a plurality of inverter circuits, each of which supplies an electric current supplied from an external power supply to the motor based on the driving signal outputted from the controller, and first temperature sensors, each of which measures a temperature of a separate one of the plurality of inverter circuits. A first temperature difference is defined as the temperature of one of the inverter circuits minus the temperature of a remaining one of the inverter circuits The controller, when the first temperature difference is equal to or greater than a predetermined difference value at a specific time point, outputs a driving signal indicating a second driving amount smaller than a first driving amount to the one of the inverter circuits.

Abstract: A linear motor system comprises a plurality of stator elements that have one or more magnetic coils for generating a magnetic flux in the respective stator element and at least one mover that has at least one magnetic element that interacts with the magnetic coils of the stator elements. The mover is moved by means of activation of at least one stator element in a direction of movement relative to the stator elements. At least one selected stator element is configured to change with respect to the magnetic flux from a first state into a second state or to have the second state permanently while at least some of the other stator elements remain in the first state so that the selected stator element exerts a braking and/or holding force on the mover in the second state.

Abstract: A motor system includes a reluctance motor and a circuit connected to the reluctance motor. The reluctance motor includes a rotor including N rotor salient poles where N is an integer of 2 or more, a stator including M stator salient poles where M is an integer of 3 or more, 3-phase coils to excite the stator salient poles, and a sensor to detect a rotational position of the rotor. The circuit applies 120-degree conduction to the 3-phase coils when the rotor is rotated in a first direction from a stopped state (initial position), and applies 180-degree conduction to the 3-phase coils when the rotor is rotated in a second direction that is opposite to the first direction from the stopped state.

Abstract: A power conversion device includes a first inverter connected to first ends of the first coil group, a second inverter connected to first ends of the second coil group, a separation relay circuit connected to second ends of the first coil group and second ends of the second coil group to switch between connection and disconnection of the first and second coil groups, a first neutral point relay circuit connected to the second ends of the first coil group to switch between connection and disconnection of the second ends of the first coil group, and a second neutral point relay circuit connected to the second ends of the second coil group to switch between connection and disconnection of the second ends of the second coil group.