Abstract: An axial gap motor includes a rotor, a first stator, a second stator, a stator moving unit, and a rotor vibration detector. The rotor is supported by a rotation shaft. The first stator faces the rotor with a predetermined gap in a longitudinal direction of the rotation shaft. The second stator faces the first stator with the rotor being disposed therebetween. The second stator is disposed on an opposite side to the first stator. The second stator faces the rotor with a predetermined gap. The stator moving unit is configured to change a relative position between the first stator and the second stator in a circumferential direction of the rotation shaft. The rotor vibration detector is configured to detect a vibration state of the rotor. The stator moving unit is configured to rotate at least one of the first stator or the second stator with respect to the other around an axis according to a change in the vibration state of the rotor.

Abstract: The inventive concept provides a motor driving module, a operating method for the same, and a Brush less Direct Current (BLDC) motor system. The motor driving module is provided which comprises a motor driving unit configured to output a plurality of switching signals based on a plurality of position signals and a control signal; and a Pulse Width Modulation (PWM) inverter configured to output 3-phase voltages based on the plurality of switching signals outputted from the motor driving unit, wherein the motor driving unit comprises; a correction circuit configured to detect an error of the plurality of position signals to output a compensation signal based on the detecting result; and a control circuit configured to output the plurality of switching signals based on the compensation signal and the control signal, wherein the plurality of position signals indicate a position of a rotor in an external motor.

Abstract: Starting from the known rotating electromechanical converter comprising a stator with magnetic circuits and polyphase energizing windings, a first, inner, rotor with magnetic circuits and polyphase energizing windings, and a second (inter)rotor between this first rotor and the stator, provided with permanent magnetic members for co-operation with the magnetic circuit of at least the stator, the invention proposes to provide means for modifying the state of magnetization of at least a part of the respective areas of the second rotor which each lie between two successive permanent magnetic members.

Abstract: To provide a motor control circuit that variably controls the speed of a motor, in which an appropriate control gain corresponding to the speed of the motor that is set can be automatically set. The motor control circuit includes a period error signal output means, a speed error signal output means and a gain correction means.

Abstract: A method is provided of calibrating a position sensor of an electric motor of a vehicle.

Abstract: Embodiments of the invention comprise a multi-input range box driven by multiple electric drives. Range shifting involves momentarily increasing the current through all but a given motor, to a level that will carry the entire load, comprising specified constant power. Simultaneously, torque of the given motor is reduced to zero. The given motor is then disconnected from supplying power, is synchronized to the input speed of the new speed range, and is then engaged for the new range. The above sequence is then repeated for each remaining motors, in turn. The motor current is re-equalized for all of the motors, after all the motors have been connected to provide power at the new range. Thus, there is no interruption in power flow during a range shift, and the motors are always used to deliver power, rather than to serve as a brake.

Abstract: The invention relates to a method of operating an electromechanical converter, in particular an electric variable transmission, provided with a primary shaft having a rotor mounted thereon, a secondary shaft having an interrotor mounted thereon, and a stator, fixedly mounted to the housing of the electromechanical converter, wherein, viewed from the primary shaft in radial direction, the rotor, the interrotor and the stator are arranged concentrically relative to each other. The rotor and the stator are designed with one or more windings. Further, the interrotor forms one whole both mechanically and electromagnetically, and is arranged as a conductor for magnetic flux in an at least tangential direction. The method comprises the step of variably controlling a magnetic rotor flux.

Abstract: An apparatus for testing number of turns, used for testing the number of turns of a winding coil on an electrical machine stator with concentrated winding, comprising: a base (6); a rod-shaped rotor bracket (4) around one end of which an excitation coil (1) is wound and around the other end of which a standard coil (2) is wound; a joining member for joining the base (6) with the rotor bracket (4) so that the base (6) and the rotor bracket (4) can rotate relative to each other, wherein the plane of the base (6) is parallel to the rotor bracket (4); a fixing member for fixing the electrical machine stator (5) with concentrated winding to the base (6) so as to make the stator (5) concentric and coplanar with the rotor bracket (4); a galvanometer (17) connected to the standard coil (2), which is connected to the tested coil (3) of the stator (5) in reverse polarity to form a loop during testing. Also provided is a method for using the apparatus to test the number of turns.

Abstract: A permanent magnet generator comprises a stator core, a plurality of windings situated on the stator core, and a plurality of stress elements. The stress elements apply or relieve mechanical stress in response to control signals from a generator controller, thereby increasing or reducing voltage across the stator windings.

Abstract: An inverter comprises output switches for generating motor phase currents for application to an electrical motor based on a commanded torque. A current sensor is arranged for detecting motor phase currents applied to the electrical motor by an inverter. A voltage sensor is configured for measuring voltages applied to the electrical motor by the inverter. An output port is capable of outputting output signals of the detected motor phase currents and measured voltages for processing by a vehicle controller. The output signals are suitable for input to a vehicle controller for determining whether or not to generate an override control signal. An input port is configured for receiving the override control signal from the vehicle controller. The input port is coupled to an override input module for switching off a supply of electrical energy to the electric motor.

Abstract: A system and method are provided for controlling the speed of a motor driving a load that is electrically connected to a generator driven by an engine, through use of a first control feedback loop configured to control the rotor flux of the motor by controlling the field excitation of the generator, and a second control feedback loop configured to control the speed of the motor by controlling the throttle position of the engine.

Abstract: Embodiments of the invention comprise a multi-input range box driven by multiple electric drives. Range shifting involves momentarily increasing the current through all but a given motor, to a level that will carry the entire load, comprising specified constant power. Simultaneously, torque of the given motor is reduced to zero. The given motor is then disconnected from supplying power, is synchronized to the input speed of the new speed range, and is then engaged for the new range. The above sequence is then repeated for each remaining motors, in turn. The motor current is re-equalized for all of the motors, after all the motors have been connected to provide power at the new range. Thus, there is no interruption in power flow during a range shift, and the motors are always used to deliver power, rather than to serve as a brake.

Abstract: A lithographic apparatus includes a positioner configured to position a first part of the apparatus relative to a second part of the apparatus, the positioner including a motor having a motor position dependent motor constant defining a relation between a motor input and a motor output, and a control system to drive the motor, the control system including a set-point generator to provide a reference signal based on a desired position of the first part relative to the second part, and a controller to provide a drive signal to the motor based on the reference signal, wherein the controller includes a compensator which is configured to at least partially compensate the drive signal for the motor position dependent motor constant. The invention further relates to a positioner, a method to optimize the positioning system, and a method to derive a motor position dependent motor constant.

Abstract: A permanent magnet generator comprises a stator core, a plurality of windings situated on the stator core, and a plurality of stress elements. The stress elements apply or relieve mechanical stress in response to control signals from a generator controller, thereby increasing or reducing voltage across the stator windings.

Abstract: An electronic protection system for motors is provided that includes electric current (SC1-n) sensor elements, more specifically Hall positioning sensors, and electronic circuits for electric tension reading. The signals are processed by a central processor (2) that executes a set of rules (A, B, C) and makes inferences based on the collected data in order to protect the motor (M, M?) against possible failure. Furthermore, a method to protect motors (M, M?) is provided, based on a set of rules (A, B, C) in order to characterize failures and trends of possible failures, so that the motor does not operate out of its specification for the system to deactivate it.

Abstract: The invention relates to a motor arrangement, in particular for use in an electronic steering system, comprising a polyphase motor (1) in a motor housing (10); a housing element (14), which forms a part of the motor housing (10); an electronic isolating relay module (2, 40) in order to switch one or more motor phases such that their current does not flow in the event of a fault; wherein the isolating relay module (2, 40) is arranged in the housing interior on one side of the housing element (14).

Abstract: A device and method for matching the rates of speed at which an electric motor that is drivingly connected to a worm gear raises and lowers a window in an automobile power window assembly. By axially displacing the motor's armature, and/or by varying the thread and tooth profiles of the worm and the gear, the amount of torque produced by the motor and transmitted through the worm gear can be altered. In order to compensate for the effect of gravity on the motor load and on the window's speed of ascent and descent, more torque is provided when the window is being raised and less torque is provided when the window is being lowered.

Abstract: Embodiments of the invention comprise a multi-input range box driven by multiple electric drives. Range shifting involves momentarily increasing the current through all but a given motor, to a level that will carry the entire load, comprising specified constant power. Simultaneously, torque of the given motor is reduced to zero. The given motor is then disconnected from supplying power, is synchronized to the input speed of the new speed range, and is then engaged for the new range. The above sequence is then repeated for each remaining motors, in turn. The motor current is re-equalized for all of the motors, after all the motors have been connected to provide power at the new range. Thus, there is no interruption in power flow during a range shift, and the motors are always used to deliver power, rather than to serve as a brake.

Abstract: A control apparatus that controls a driving apparatus configured with a stator. A variable magnetic flux type rotating electrical machine has a first and second rotor, circumferential direction relative positions of which can be adjusted. A relative position adjustment mechanism adjusts the relative positions of the two rotors. A control command determination unit that determines, on the basis of a required torque and a rotation speed, an inter-rotor phase command indicating the relative positions for minimizing a system loss including at least an electrical loss, which includes a copper loss and an iron loss of the rotating electrical machine, and a mechanical loss of the relative position adjustment mechanism. A current command drives the rotating electrical machine. A control unit controls the rotating electrical machine on the basis of the current command and controls the relative position adjustment mechanism on the basis of the inter-rotor phase command.

Abstract: A power electronics device with an improved IGBT protection mechanism is provided. More specifically, systems and methods are provided for shortening the duration of a shutdown test pulse, such that the power output to the load is substantially unaffected.

Abstract: A drive unit includes a rotating electrical machine; a rotation sensor that detects a rotational position of a rotor of the rotating electrical machine, and a storage medium. In an inspecting step of measuring a counter electromotive force by mechanically driving the rotating electrical machine after the rotating electrical machine and the rotation sensor are assembled together, positional error information of the rotation sensor obtained based on information of the counter electromotive force and output information from the rotation sensor is stored in the storage medium. The storage medium is integrally provided to the drive unit in such a state that the storage medium is readable upon assembling a control device that controls the rotating electrical machine.

Abstract: Featured is a controller for a motor that is ultra-compact, with a power density of at least about 20 watts per cubic cm (W/cm3). The controller utilizes a common ground for power circuitry, which energizes the windings of the motor, and the signal circuitry, which controls this energization responsive to signals from one or more sensors. Also, the ground is held at a stable potential without galvanic isolation. The circuits, their components and connectors are sized and located to minimize their inductance and heat is dissipated by conduction to the controller's exterior such as by a thermally conductive and electrically insulating material (e.g., potable epoxy). The controller uses a single current sensor for plural windings and preferably a single heat sensor within the controller. The body of the controller can also function as the sole plug connector.

Abstract: Size and weight reduction of a motor-driven vehicle, robot or the like is achieved. A current command Iref from a speed feedback gain is supplied to each of circuits with coefficients of sin(?m), sin(?m+2?/3) and sin(?m?2?/3) to generate three-phase signals. The three-phase signals are respectively supplied to current control gains through adder-subtracters. Further, signals from motor constants are added together by an adder to produce motor torque. Furthermore, coil voltages output from adders pass through diodes and are then added together by an adder, and the signal is supplied to a regenerative voltage determiner. When a regenerative voltage becomes excessive, in-phase current Idc is supplied through a regeneration control gain to adder-subtracters.

Abstract: A generator-motor apparatus includes a control circuit, an alternator, electrode plates, and switching devices. The electrodes plates have a substantial horseshoe shape, and are provided on an end surface of the alternator so as to surround a rotating shaft of the alternator. Each of the switching devices is formed by sandwiching a MOS transistor between two electrodes, and has a can structure for sealing the internal space of the switching device using a resin. The switching devices are directly attached to the electrode plate by means of soldering, and the switching devices are directly attached to the electrode plate by means of soldering. The control circuit controls the switching devices. The switching devices drive the alternator as an electric motor or an electric power generator.

Abstract: A power electronics device with an improved IGBT protection mechanism is provided. More specifically, systems and methods are provided for shortening the duration of a shutdown test pulse, such that the power output to the load is substantially unaffected.

Abstract: In a multi-phase motor drive that includes a bus capacitor, a multi-phase motor, a multi-phase inverter, multiple switches each having an on-state and an off-state, and multiple current sensors each being in series with respective phase winding, a method for checking the accuracy of circuit parameters of the motor drive, including using the switches to produce a first loop that includes the capacitor bank, a first phase winding, a first current sensor, a second phase winding, and a second current sensor, using the current sensors to determine a magnitude of current in the first and second phase windings, comparing a magnitude of current indicated by the first current sensor and the second current sensor, and determining a magnitude of a difference between the current in the first and second phase windings.

Abstract: A motor control circuit includes: a detector outputting a detection signal in accordance with the motor rpm; a counter counting the number of clocks in accordance with a rotational cycle represented by the detection signal; a controller counting a DC motor based on the count value; and a divider dividing a frequency of a basic clock based on a preset division value to generate a counting clock. The divider generates a counting clock having a frequency corresponding to a rotational cycle, and the counter counts the number of counting clocks.

Abstract: A method of commutating a motor includes operatively interfacing a stator and actuated component of the motor, arranging at least two winding sets relative to the actuated component, and independently controlling the at least two winding sets so that with the at least two winding sets the actuated component is both driven and centered.

Abstract: An axial gap type motor/generator is provided with a stator, a rotor and an alternating current control device. The alternating current control device executes alternating current control of a single phase or multiple phase alternating current flowing in the coils. The alternating current control device includes a superpositioning control section and a frequency component control section. The superpositioning control section produces the alternating current by superpositioning a plurality of frequency components including a first order fundamental wave component and a plurality of higher harmonic wave components that have frequencies equal to integer multiples of a frequency of the fundamental wave components and are of orders that are equal to values of the integer multiples. The frequency component control section controls a relationship among the frequency components such that two pairs of the frequency components whose orders differ by two are aligned with respect to each other.

Abstract: A drive motor assembly for a power driven wheelchair comprises: a stator housing for containing field coils of a stator of the motor assembly; at least one sensor disposed in the stator housing for sensing rotation of the motor; a memory storing motor error parameter data including data of errors of the at least one sensor, the memory being embedded in the stator housing; and a connection for accessing the error parameter data of the memory from the stator housing. The motor error parameter data may be accessed from the embedded memory of the drive motor by a programmed motor controller for use in controlling the drive motor.

Abstract: A drive motor assembly for a power driven wheelchair comprises: a stator housing for containing field coils of a stator of the motor assembly; at least one sensor disposed in the stator housing for sensing rotation of the motor; a memory storing motor error parameter data including data of errors of the at least one sensor, the memory being embedded in the stator housing; and a connection for accessing the error parameter data of the memory from the stator housing. The motor error parameter data may be accessed from the embedded memory of the drive motor by a programmed motor controller for use in controlling the drive motor.

Abstract: A central vacuum cleaning system has a motor in a motor housing in a canister with a receptacle. In the motor housing is a motor control circuit with a printed circuit board. The motor control circuit is mounted to the motor housing using a mounting post having a light guide. The mounting post receives light from a light source on the printed circuit board and guides the light through the mounting post to outside the motor housing. The mounting post can guide the light through structural or non-structural elements. The light provides illuminated information messages to a user. The mounting post has a low voltage connection section for receiving low voltage conductors from outside the motor housing. As the motor control circuit is within the motor housing, the motor housing is a motor control housing. The motor control housing can be separate from the motor housing.

Abstract: A pole position detector correctly detects a pole position of a permanent magnet motor. Each magnetic sensor (27) provides an electric signal in response to leakage flux from a magnet rotor (17). A computation unit (2) detects a change in the output of the magnetic sensor as a base pole position &thgr;, corrects the base pole position by &Dgr;&thgr; according to the base pole position, the magnitude of each stat or current (IU, IV, IW), and a current phase, and calculates correct rotation angles &thgr;re and &thgr;re′ accordingly. With low-cost magnetic sensors (27), the pole position detector corrects the outputs of the magnetic sensors affected by stat or current and provides a correct pole position or a correct rotor rotation angle.

Abstract: A pole position detector correctly detects a pole position of a permanent magnet motor. Each magnetic sensor (27) provides an electric signal in response to leakage flux from a magnet rotor (17). A computation unit (2) detects a change in the output of the magnetic sensor as a base pole position &thgr;, corrects the base pole position by &Dgr;&thgr; according to the base pole position, the magnitude of each stat or current (IU, IV, IW), and a current phase, and calculates correct rotation angles &thgr;re and &thgr;re′ accordingly. With low-cost magnetic sensors (27), the pole position detector corrects the outputs of the magnetic sensors affected by stat or current and provides a correct pole position or a correct rotor rotation angle.

Abstract: A turbomolecular pump device having a DC brushless motor provided with a simplified rpm detection mechanism is provided. A pickup coil for detecting a magnetic flux produced by a permanent magnet of the DC brushless motor is built in the motor. Namely, a small size, low cost, simple and strong pickup coil is disposed in a space between the permanent magnet (rotor) of the DC brushless motor and the motor drive coil (stator coil). The magnetic flux produced by the permanent magnet in the pickup coil is detected. This is converted into an rpm signal of the DC brushless motor by a sequence controlling circuit. It is supervised whether or not the overspeed is performed. Then, when the overspeed is detected, an interruption command is fed to the power source breaker so that the supply of the power is forcibly interrupted to thereby stop the DC brushless motor.

Abstract: The present invention relates to an electric motor starter for starting motors rotating at synchronous speed. The starter comprises a programmable logic circuit having input ports for receiving control commands intended for the electric motor and supervisory signals reporting the operating state of the motor, and output ports for drive signals intended for the electric motor and information signals reporting the operating state of the motor. The logic circuit comprises stored therein various logical motor starter connections for various electric motors. Further the starter comprises means for selecting for use one of the various motor starter connections stored in the logic circuit; and connection means for connecting a control according to the drive signals to the electric motor.

Abstract: For a CVT (3) a regulating system is proposed in which a corrector is located upstream of the control path. The disturbances and non-linearities in the control path (28) are taken into account in the corrector, via a mathematical model, so that the regulator can be designed as a simple PID regulator.

Abstract: The invention relates to a process for detecting the position and direction of movement and for detecting the dynamic characteristic values of remote-controlled displacements of an adjustable object. According to the invention a signal is detected and evaluated which is solely made up of a system-characteristic signal or the overlapping of several system-characteristic signals. The aim is to achieve a high dissolution of the aforesaid values which are to be detected without using additional sensor or transmitter elements whilst incurring only small production costs.

Abstract: A planar bracket for demountably affixing an incrementally controlled motor for a manually settable x-ray difractometer. A gear pully and driver are operably interconnected to rotate the instrument axis. Two interrupters are utilized to sense an occurrence of a limit pin as well as a direction of travel.

Abstract: A silent, high torque, impulse actuator system for low average power devices. The system incorporates a typical small three pole D.C. motor which has been modified to allow quick electrical conversion, with unipolar switching circuitry, from conventional rotation, to silent magnetic braking at a stop position; and then to a normally OFF condition.The high efficiency of this intermittent drive system is enhanced by the unique combination of being normally off between actuations; the high efficiency of the D.C. motor during start conditions; and the use of a round cam to provide a cosine power stroke that utilizes the inertia of the motor rotor to maximum mechanical advantage.

Abstract: A wiper apparatus using a three brush, permanent magnet motor in which a zener diode has a cathode connected to the low speed brush and an anode connected to the high speed brush. The zener breakdown voltage of the zener diode is chosen so that it reverse conducts during at least some portion of each wipe cycle during operation with the high speed brush on a wet window to limit peak wiper speeds and reduce strain on the wiper mechanism. Variations including a transistor, relay or additional zener diode controlled by the zener diode and connected in parallel therewith provide for reduced current and therefore power dissipation in the zener diode at the expense of somewhat limited speed limiting.

Abstract: A traverse rod having a reversible torque responsive motor-drive assembly for operating the traverse rod. The motor-drive assembly includes a stationary casing fixed to the rod and a movable casing mounted in the stationary casing for angular movement relative thereto about a turn axis. A reversible DC motor in the movable casing is connected through a planetary gear speed reducer to a traverse cord drive wheel for applying driving torque thereto. The movable casing is arranged to turn about the turn axis in opposition to the torque applied to the drive wheel and is yieldable urged angularly about the turn axis toward a preselected neutral position relative to the stationary casing. The motor-drive assembly has a torque responsive motor control including stationary brush contacts fixed on the stationary casing and adapted for connection to a power supply and movable electrically conductive segments fixed on the movable casing and electrically connected to the motor.

Abstract: A conventional three pole D.C. motor has a third placed at an acute angle of 60 degrees to one of the normal brushes and positioned to contact the commutator plates. A motor energizing circuit is normally off and is capable of energizing the normal brush and, alternately, the third brush which is displaced 60 degrees from the normal brush. A single intermittent rotation begins with the normal brush being energized, and continues in a conventional manner until a rotation sensor at approximately 300 degrees cuts off the normal brush and energizes the third brush for a specific period, during which time all armature poles are of opposite polarity to the adjacent field poles; which causes the motor to be magnetically braked at the 360 degree full rotation point. At the end of the braking period, all power is removed until the next intermittent cycle.

Abstract: A vehicle power steering apparatus for rotating a motor in response to a torque signal generated in response to a rotational torque of input and output steering shafts and for driving a steering direction control unit using a rotational force of said motor so as to perform power steering, comprising: vehicle velocity detecting means for detecting a vehicle velocity; rotational direction and rotational torque detecting means for detecting a rotational direction and a rotational torque of the input and output steering shafts in response to a signal generated by the rotational torque of the input and output steering shafts; controlling means for controlling the rotational direction of the motor in response to a detected rotational direction; and torque controlling means for decreasing the rotational torque of the motor in response to a detected vehicle speed signal when the vehicle speed is increased, and for increasing the rotational torque of the motor in response to the detected vehicle speed signal when a st

Abstract: A vehicle power steering apparatus for performing power steering by rotating a motor in accordance with a steering torque acting on input and output steering shafts and driving a steering direction control unit to perform power steering, comprises a sensor for generating an electrical signal corresponding to a displacement of a movable member displaced by a rotational force acting on the steering wheel; a controller for rotating the motor at a torque represented by the electrical signal during an ON time of the electrical signal generated from the sensor; and moving means for moving the movable member in a direction to cancel the displacement of the movable member driven by the motor.

Abstract: The condition of a surface is sensed by cyclically moving two members having engaged surfaces relative to each other, driving the surfaces for only a portion of each cycle to set up a threshold kinetic energy level in accordance with the friction between the engaged surfaces, sensing the kinetic energy developed in one of the members due to moving the members relative to each other, comparing the developed kinetic energy with the threshold kinetic energy and controlling the cyclic movement of the members in accordance with the relationship between the kinetic energy threshold and the developed kinetic energy. The cyclic movement of the members is then used to provide a visual indication of the condition of one of the surfaces.

Abstract: The first and second interpole compensation windings are disposed on the commutation starting side and the commutation ending side of the interpole cores, respectively. The current flowing through the first and second interpole compensation windings are controlled in response to the first and second voltages detected by the first and second brushes disposed on the commutation starting side and the commutation ending side of the brushes.

Abstract: An electric motor for a magnetic tape recorder comprises an electrically insulating disk-shaped stator with a plurality of flatwise coils, a rotary shaft rotatably extending through the stator, and a first disk-shaped rotor of soft iron with a multi-pole annular magnet and a second disk-shaped rotor of soft iron rotatably extending through the shaft on both sides of the stator. A pulley is fixed on the shaft below the first rotor to drive capstans, and a reel disc or a pinion is coaxially connected to the second rotor to drive a take-up reel for forward play. In a fast forward feed mode, the first and second rotors can be mechanically interlinked. Alternatively, an electromagnetic solenoid may be used to take out a torque from the first rotor by engaging an idle roller with a roller fixed to the rotary a shaft above the pinion or to apply a pressure to the second rotor to increase the friction between the second rotor and an adjacent shoulder on the shaft.

Abstract: A direct current motor which includes a stator for producing a fixed magnetic field and a plurality of armature windings. The motor is caused to rotate by applying current to each winding only while that winding is passing through a zone in a given orientation relative to the stator field. The direction of rotation is changed without changing the direction of the current applied to the windings, by changing the orientation of the zone relative to the stator field, to reverse the direction of the rotational force applied to the armature. Because the current does not reverse through the armature windings, the control circuit can be simple and in a preferred embodiment includes only two gate-turn-off silicon controlled rectifiers, a switch, and a resistor.