Abstract: The present invention relates to an alternating-current electric motor of a combined electric device for powering and charging, the said electric motor being formed by a stator connected to an electricity network of which the number of phases is lower than the number of phases of the said motor, the said charging current of the said network being injected via a connection point dividing each phase of the said stator connected to a phase of the said network into two half-windings, the said motor being characterized in that each half-winding of a phase comprises a plurality of coils wired together so as to reduce the magnetic linkage of each half-winding at the said connection point so that there exists an apparent non-zero inductance at the said connection point in charging mode of the said device.

Abstract: A drive system for driving a fan in a wet cooling tower, wherein the fan has a fan hub and fan blades attached to the fan hub. The drive system has a high-torque, low speed permanent magnet motor having a motor casing, a stator and a rotatable shaft, wherein the rotatable shaft is configured for connection to the fan hub. The drive system includes a variable frequency drive device to generate electrical signals that effect rotation of the rotatable shaft of the motor in order to rotate the fan.

Abstract: The drive control circuit for an electric motor is provided. The drive control circuit includes: an original drive signal generator that generates an original drive signal; an excitation interval setter that is able, for each half cycle of respective length ? in each 2? excitation cycle of the original drive signal, to arbitrarily set excitation intervals during which to excite coils of the electric motor to any one of a plurality of intervals which include at least either one of a symmetrical interval centered on a center of each half-cycle and an unsymmetrical interval; and a drive signal shaping circuit that generates a drive signal for driving the electric motor, by validating the original drive signal during the excitation intervals and invalidating the original drive signal during non-excitation intervals other than the excitation interval.

Abstract: Dynamic reconfiguration-switching of motor windings in a motor is optimized between winding-configurations by selectively lowering resistance of a constantly used portion of one of the motor windings. Acceleration is traded off in favor of higher velocity upon detecting the electric motor in the electric vehicle is at an optimal angular-velocity for switching to an optimal lower torque constant and voltage constant. The total back electromotive force (BEMF) is prohibited from inhibiting further acceleration to a higher angular-velocity.

Abstract: The present invention provides a synchronous motor drive system designed to realize reduced vibration and noise along with high output. The system includes: inverters 101, 102, and 103 for converting a direct current to a three-phase alternating current; a current application control unit 52 that controls operations of the three-phase inverters; and a synchronous motor 41 driven by three-phase alternating currents supplied from the three-phase inverters. The current application control unit 52 determines, for each three-phase inverter, a current phase angle and a current amount of a three-phase alternating current to output, and each inverter supplies a three-phase alternating current having the determined current phase angle and current amount to a different one of three-phase coil groups 200a to 200c.

Abstract: An assembly and method for generating mass torque having a frame structure supporting at least one torque generating wheel coupled to a rotational load. The torque generating wheel has peripheral circumferential veins of spaced magnetic or non-magnetic keys which are driven by an electro-mechanical control system including a plurality of electromagnetic coils and a timing circuit. The timed activation of the electro-mechanical control system on the magnetic (or non-magnetic) keys accelerate the generating wheel to rotate at a high rotational speed to generate a high level of torque output. The wheel structure is a large diameter structure constructed of a plurality of radial segments, each segment formed of a strong, lightweight and reinforced material.

Abstract: In one embodiment, an apparatus includes a first member that supports a magnetic flux carrying member and a second member that supports a magnetic flux generating member disposed for movement relative to the first member. An air gap control system is coupled to at least one of the first member or the second member and includes an air gap control device that is separate from a primary magnetic flux circuit formed between the first member and the second member. The air gap control device is configured to exert a force on one of the first and second members in response to movement of the other of the first and second members in a direction that reduces a distance between the first and second members to maintain a minimum distance between the first and second members and/or substantially center the one of the first and second members within the other.

Abstract: A two-phase or four-phase electric machine includes a first stator part and a second stator part disposed about ninety electrical degrees apart. Stator pole parts are positioned near the first stator part and the second stator part. An injector injects a third-harmonic frequency current that is separate from and not produced by the fundamental current driving the first stator part and the second stator part. The electric angular speed of the third-harmonic rotating field comprises p · ? t , where p comprises the number of pole pairs, ? comprises a mechanical angle and t comprise time in seconds.

Abstract: An apparatus is disclosed for simultaneously measuring the rotational speed and/or direction of a shaft, and providing control power in accordance with the shaft rotation. The apparatus includes a permanent magnet machine (PMM) having a multipole rotor and a stator. The rotor has a plurality of permanent magnet poles and connection to the rotating shaft; the stator includes a winding and electrical connections, so that motion of the rotor with respect to the stator causes a voltage signal at the electrical connections. The apparatus also includes a circuit including a power conversion portion and a speed/direction sensing portion. The circuit receives the voltage signal from the PMM, and simultaneously outputs control power from the power conversion portion and a signal indicating the rotational speed and/or direction of the shaft from the sensing portion.

Abstract: A transverse flux machine includes: a winding wound in a rotational direction; a stationary component in which first ferromagnets and second ferromagnets surrounding a part of the winding are arranged in the rotational direction; a rotor capable of rotating around a rotational axis; and a rotary component opposing the stationary component and attached to the rotor, wherein the rotary component having: third ferromagnets opposing the first ferromagnets; fourth ferromagnets opposing the second ferromagnets; and first magnetic field generating sections and second magnetic field generating sections intervened between the third ferromagnets and the fourth ferromagnets, wherein the first magnetic field generating sections and the second magnetic field generating sections generate magnetic fields from an opposing surface of the rotary component toward an opposing surface of the stationary component, and directions of the magnetic fields are opposite of one another.

Abstract: A variable field magnet rotating electrical machine includes a stator, a rotor, and a rotary position detector. The stator includes a stator winding coil and a stator iron core. The rotor includes a field magnet, a first field magnetic pole portion, and a second field magnetic pole portion. The first field magnetic pole portion is configured to turn relative to the second field magnetic pole portion. The first and second field magnetic pole portions include signal generators each configured to generate a signal to detect a rotary position of a corresponding one of the first and second field magnetic pole portions. The rotary position detector is configured to detect a rotary position of the rotor.

Abstract: An angle detecting apparatus includes a rotor fixed to a rotating shaft, a pair of magnetic sensors arranged close to the outer periphery of the rotor so as to have a difference in angle (?/2) with respect to the center of rotation of the rotor, a differential operational circuit performing differential operation on detection signals output by the magnetic sensors to output a differential signal, and the angle calculating circuit calculating the angle of rotation of the rotating shaft based on the differential signal. The planar shape of the rotor is such that the sum of the distances between the center of rotation and the respective two points where two straight lines crossing at the center of rotation at a crossing angle of (?/2) cross the outer periphery of the rotor is constant, and the planar shape is symmetric with respect to a straight line passing through the center of rotation.

Abstract: A thinly configured and brushless miniature DC micro motor that includes at least two substantially-flat motor cells that are aligned axially. Each motor cell comprises a stator coil having an elongate opening and passage for a rotor shaft, and a cross-polarized rotor magnet carried on the rotor shaft and received within the elongate opening. The micro motor also includes a frame substrate that fixably supports the stator coils of the motor cells while providing a bearing means for rotatably supporting the rotor shaft, so that selectively energizing one of the motor cells creates an electric current in the stator coil interacting with a magnetic field of the received rotor magnet to generate a torque between the rotor shaft and the frame substrate.

Abstract: An integrated fan drive system for air-cooled heat exchangers. The integrated fan drive system has a high-torque, low speed permanent magnet motor having a rotatable shaft, a fan that is directly connected to the rotatable shaft, and a variable frequency drive device in electrical signal communication with the permanent magnet motor to control the rotational speed of the permanent magnet motor. The high-torque, permanent magnet motor comprises no more than two bearings in operative association with the shaft. The variable frequency drive device has a variable frequency controller that has an input for receiving AC power and an output for providing electrical signals that control the operational speed of high-torque, permanent magnet motor. The variable frequency drive device also includes a user interface in electronic data signal communication with the variable frequency controller to allow a user to input motor speed control data. Other embodiments of the invention are described herein.

Abstract: Method for starting a single-phase synchronous electric motor using permanent magnets with simple and cost-effective implementation, said method comprising a step of application of a control logic of the switch that provides a first and a second condition for switching on: the first condition being verified when a detected counter electromotive force signal has the same sign as an electrical grid voltage signal; the second condition being verified when said counter electromotive force signal has the same sign as its first derivative value.

Abstract: A control device for a driving apparatus configured with a rotary electric machine having a rotor with a permanent magnet and a stator having a coil. A field adjusting mechanism is configured to change a field flux supplied by the rotor, and an inverter is connected to the coil. A field command determining portion is configured to determine a field command value that serves as a target for the field flux that is adjusted by the field adjusting mechanism, based on at least a rotation speed of the rotor, with a field limiting value, that is set according to the rotation speed of the rotor within a range in which induced voltage that is induced in the coil will not exceed a voltage resistance of the inverter, as an upper limit.

Abstract: The invention relates to an electrical drive having a motor with a rotor and a stationary stator, which has a coil arrangement, and having a motor controller for controlling the motor, with the motor controller being configured to pass current through the coil arrangement in order to produce an excitation field, with the coil arrangement having a plurality of coil winding sections, and with each coil winding section having a plurality of coil sections, wherein the polarity of at least one coil section of the plurality of coil sections of each coil winding section can be selectively reversed with respect to the other coil sections of the coil winding section. The drive is particularly suitable for use for an electrical tool.

Abstract: An integrated fan drive system for a cooling tower comprising a high-torque, low speed permanent magnet motor having a rotatable shaft, a fan comprising a hub that is directly connected to the rotatable shaft and a plurality of fan blades that are attached to the hub, and a variable frequency drive device in electrical signal communication with the permanent magnet motor to control the rotational speed of the permanent magnet motor. The high-torque, permanent magnet motor comprises no more than two bearings in operative association with the shaft. The variable frequency drive device has a variable frequency controller that has an input for receiving AC power and an output for providing electrical signals that control the operational speed of high-torque, permanent magnet motor. The variable frequency drive device also includes a user interface in electronic data signal communication with the variable frequency controller to allow a user to input motor speed control data.

Abstract: A driving method for a motor includes sensing variation of magnetic pole of a rotator of the motor, to generate a magnetic pole sensing signal, determining dead zone of the motor according to the magnetic pole sensing signal, to generate a determination result, and adjusting voltage outputted to a coil of the rotator according to the determination result.

Abstract: An electromagnetic pulse engine is disclosed. The engine includes a housing, a drum concentrically mounted within the housing and adapted to rotate therein, a plurality of permanent magnets mounted about an internal cylindrical wall of the drum, and a plurality of electromagnets mounted radially about an annular bearing. Successive permanent magnets of the plurality of permanent magnets have an opposing polarity facing inward, where at least one electromagnet of the plurality of electromagnets is adapted to be selectively energized and de-energized to attract a first permanent magnet and to repel a second permanent magnet to rotate the drum about the plurality of permanent magnets. In addition, the engine includes an axial shaft that is secured to the drum for rotating therewith, where the annular bearing supporting the plurality of electromagnets is secured against rotation relative to the axial shaft.

Abstract: The drive control circuit for an electric motor is provided. The drive control circuit includes: an original drive signal generator that generates an original drive signal; an excitation interval setter that is able, for each half cycle of respective length ? in each 2? excitation cycle of the original drive signal, to arbitrarily set excitation intervals during which to excite coils of the electric motor to any one of a plurality of intervals which include at least either one of a symmetrical interval centered on a center of each half-cycle and an unsymmetrical interval; and a drive signal shaping circuit that generates a drive signal for driving the electric motor, by validating the original drive signal during the excitation intervals and invalidating the original drive signal during non-excitation intervals other than the excitation interval.

Abstract: A electric motor is disclosed in which torque ripple is reduced. The electric motor includes a single motor shaft. Rotors are disposed so as to be mutually offset in phase, and the rotors are secured to the motor shaft. Stators are arranged so as to individually correspond to the rotors, and the stators are disposed so as to be matched in phase. The phases of torque ripple generated in each motor unit, which is comprised of a combination of a single rotor and a single stator, are offset.

Abstract: In a rotary electric system, a controller works to turn high-side and low-side switching elements of first and second multiphase inverters on and off to thereby cause: the first multiphase inverter to intermittently supply a first phase current to the first star-connected multiphase stator windings per phase to charge first electromagnetic energy in first star-connected multiphase stator windings per phase, the first electromagnetic energy charging a capacitor; the second multiphase inverter to intermittently supply a second phase current to the second star-connected multiphase stator windings per phase to charge second electromagnetic energy in the second star-connected multiphase stator windings per phase, the second electromagnetic energy charging the capacitor. The first phase current for each phase and the second phase current for a corresponding one phase have a predetermined second phase difference from each other, and the first phase difference is matched with the second phase difference.

Abstract: An electric bike includes a wheel driving apparatus. The wheel driving apparatus includes an electric wheel drive motor which drives a wheel, a gap changer which changes a gap length in the wheel drive motor, and a motor control unit which controls the wheel drive motor and the gap changer. The motor control unit calculates a target gap length for the gap changing motor in the gap changer based on an accelerator opening-degree signal, a rotation speed, a q-axis electric-current command value, a power source voltage, and a voltage utilization rate. Then, a feedback control is provided to the gap changer based on a difference value between the target gap length and the actual gap-length. A good vehicle characteristic is obtained without being affected by individual variability or operating environment of the electric motor through efficient drive of the electric motor from a low-speed range through a high-speed range.

Abstract: Systems and apparatus are provided for an inverter system for use in a vehicle having a first energy source and a second energy source. The inverter system comprises an electric motor having a first set of windings and a second set of windings. The inverter system further comprises a first inverter coupled to the first energy source and adapted to drive the electric motor, wherein the first set of windings are coupled to the first inverter. The inverter system also comprises a second inverter coupled to the second energy source and adapted to drive the electric motor, wherein the second set of windings are coupled to the second inverter. A controller is coupled to the first inverter and the second inverter to achieve desired power flow between the first energy source, the second energy source, and the electric motor.

Abstract: An improved single-switch control circuit for use in a multi-phase switched reluctance machine is provided. The control circuit includes at least first and second phase windings, a switch, a capacitor, and a diode. The capacitor may have a polarity opposite that of a power source in the control circuit. The first winding may be connected in series with the switch and connected in parallel with a circuit block comprising the second winding. The second winding may be connected in parallel with the capacitor and in series with the diode. In operation, the switch may be used to redirect current from the first winding to the second winding. The capacitor can become charged by the redirected current until it eventually stores enough energy to essentially discontinue current flow in the first winding. Then, the capacitor can discharge its stored energy as a current through the second winding. In this manner, substantially all of the energy from the first winding can be transferred to the second winding.

Abstract: An exciting coil of a motor is formed to be controlled by using an analog timer, to thus control an excitation control circuit of a motor control apparatus, whereby an excitation control circuit which excites the exciting coil of a motor control apparatus can be simplified and complexity can be reduced by simplifying a circuit construction of an excitation controller. The apparatus includes an auxiliary winding (sub-coil) and a main winding (main coil), and an exciting device electrically connected with the auxiliary winding and the main winding, determines an excitation application time and an excitation time and generates an excitation current according to the determined excitation application time and the excitation time.

Abstract: A brushless direct current (DC) motor includes a rotor, a stator and a driving unit. The rotor includes a plurality of magnetic poles. The stator includes a plurality of upper pole arms and a plurality of lower pole arms. The driving unit includes at least two coils wound on the upper pole arms and the lower pole arms respectively, and the driving unit generates an alternating magnetic field on the stator for driving the rotor.

Abstract: Provided is a high frequency (HF) leakage current return wire-contained motor drive cable configured in a manner that one or multiple drive dielectric core wires (2) and one or multiple HF leakage current return wires (5) are arranged adjacent to and in close contact in neighborhoods thereof to thereby reduce inductances of the HF leakage current return wires (5). Concurrently, the drive dielectric core wires (2) and the HF leakage current return wires (5) are arranged substantially parallel to the longitudinal direction and are stranded; and a sheath (8) is provided without a shield being provided outside of the strand wires.

Abstract: A fan speed control circuit is used for controlling rotation speed of a fan. The fan speed control circuit receives a pulse width modulation (PWM) signal from a system and comprises a programmable control unit and a current control unit. The programmable control unit receives the PWM signal, is connected to a Hall element for receiving a voltage signal therefrom, and provides a control signal. The current control unit takes the control signal to control current flowing through a stator coil unit of the fan so as to control the speed of the fan. The programmable control unit has a program written for the PWM signal, and when the fan speed control circuit is used in another system with a different PWM signal, the programmable control unit can be given a new program for the different PWM signal for controlling the speed of the fan.

Abstract: A method of constant airflow control for a ventilation system is disclosed. The method includes various controls to accomplish a substantially constant airflow rate over a significant change of the static pressure in a ventilation duct. One control is a constant I·RPM control, which is primarily used in a low static pressure range. Another control is a constant RPM control, which is primarily used in a high static pressure range. These controls requires neither a static pressure sensor nor an airflow rate sensor to accomplish substantially constant airflow rate while static pressure changes. This is because these controls use only intrinsic control variables which are electric current and rotational speed of the motor. Also, the method improves the accuracy of the control by correcting certain deviations that are caused by the motor's current-RPM characteristics. To compensate the deviation, the method adopts a test operation in a minimum static pressure condition.

Abstract: A motor with a controllable rotor-pole magnetic intensity includes an electromagnetic pole rotor of an electromagnetic coil instead of a magnetic pole rotor composed of permanent magnets. The magnetic intensity variations of the electromagnetic poles of the rotor can be freely and automatically controlled according to input currents or a feedback signal representing a rotating speed of the motor or a load current of the stator so that the torque and the rotating speed of the motor can be changed. This invention has overcome the restriction that the torque and the rotating speed of the motor are restricted by the fixed permanent magnets so that the performance of the motor can be enhanced.

Abstract: A low cost switching system for an electrical motor, which is speed sensitive, direction of rotation insensitive, load insensitive and voltage fluctuation insensitive. The switch contains a power supply, a control circuit, a zero cross detector circuit, a triggering circuit and an electronic switch to provide the switching action. A time delay hysteresis inducement circuit is provided in the switching system to energized and deenergized the capacitor at a predetermined synchronous speed of the motor. The switching system first checks the speed of the motor before reenergizing the start capacitor, which increases the life of the motor. The switching system operates in high temperature range and regardless the value of the capacitor used.

Abstract: A single-phase brushless forward and reverse turn control circuit device is provided, in which a PCB is provided on a stator unit and a rotor unit that are mutually encircled and spaced from each other. On the PCB, a microprocessor unit, a logic unit, a drive unit, and at least one sensor are provided. The sensor is provided in the outer circumference of PCB to sense the variation of a magnetic pole of the rotor unit and then transmit it back to the logic unit and supply it to the drive unit, making the drive unit control the current passing through the coils and then the stator unit generate an opposite magnetic field, the rotor unit thereby smoothly running forward or reversely.

Abstract: A change in torque produced by a motor having two rotors is reduced when the motor operates in a low-velocity and low-torque operational state. The motor has a first rotor and a second rotor, each of which has a permanent magnet, and an output shaft capable of rotating integrally with the first rotor. The second rotor can relatively rotate with respect to the first rotor by a driving force from a phase difference changing driving device, and the phase difference between the rotors (rotor phase difference) can be changed by the relative rotation of the second rotor with respect to the first rotor. When the values of the torque and the rotational velocity of the motor lie within a predetermined region in the proximity of 0, the phase difference changing driving device adjusts the rotor phase difference to a predetermined phase difference for which the strength of a composite field of the permanent magnets is lower than a maximum strength.

Abstract: The stackable brushless DC motor comprises one or more stackable motor sections disposed within a housing for use in cars or other vehicles. Each stackable motor section comprises a permanent magnetic rotor and electromagnetic stator. The permanent magnetic rotor comprises a plurality of permanent magnets. The electromagnetic stator comprises a plurality of conductive windings. The one or more stackable motor sections are characterized by a significantly thin and flat geometry. The housing comprises mounting flanges that support mounting in a car or other vehicle. The flat sides of the one or more stackable motor sections have no protuberances or features that would preclude adjacent stacking of said motors. The one or more stackable motor sections include openings through which a common shaft is disposed.

Abstract: An apparatus and a method of manufacture of a DC electric motor operable over a range of voltage by virtue of a DC-DC regulator having an inductance provided by one or more windings on the stator of the motor. A conductor is wound about an interpole of the stator and coupled, as an inductance, to a voltage regulator circuit, allowing operation of the DC motor over a substantial range of input voltage.

Abstract: In a rotary electric system, a controller works to turn high-side and low-side switching elements of first and second multiphase inverters on and off to thereby cause: the first multiphase inverter to intermittently supply a first phase current to the first star-connected multiphase stator windings per phase to charge first electromagnetic energy in first star-connected multiphase stator windings per phase, the first electromagnetic energy charging a capacitor; the second multiphase inverter to intermittently supply a second phase current to the second star-connected multiphase stator windings per phase to charge second electromagnetic energy in the second star-connected multiphase stator windings per phase, the second electromagnetic energy charging the capacitor. The first phase current for each phase and the second phase current for a corresponding one phase have a predetermined second phase difference from each other, and the first phase difference is matched with the second phase difference.

Abstract: The invention relates to a brushless electric motor with a rotor assembled with permanent magnets, a stator performed with coils, at least one magnetic field sensor for sensing the actual position of the rotor, and with a control circuit for supplying the coils of the stator with current in due time, where between the rotor and the stator a mug-shaped housing is located, being closed by a base versus the control circuit and the at least one magnetic field sensor, where the mug-shaped housing is made out of a non-magnetic material, and where the at least one magnetic field sensor is arranged outside the mug-shaped housing at the base thereof. The invention further relates to an electric pump.

Abstract: The present invention provides a variable reluctance actuator system and method that can be adapted for simultaneous rotation and translation of a moving element by applying a normal-direction magnetic flux on the moving element. In a beneficial example arrangement, the moving element includes a swing arm that carries a cutting tool at a set radius from an axis of rotation so as to produce a rotary fast tool servo that provides a tool motion in a direction substantially parallel to the surface-normal of a workpiece at the point of contact between the cutting tool and workpiece. An actuator rotates a swing arm such that a cutting tool moves toward and away from a mounted rotating workpiece in a controlled manner in order to machine the workpiece. Position sensors provide rotation and displacement information for a swing arm to a control system.

Abstract: The brushless motor includes a stator having a electromagnetic coil and a position sensor; an axis fixed to the stator; and a rotor having a permanent magnet. The rotor rotates around the axis. The rotor is linked to a driven member that is driven by the brushless motor.

Abstract: Motors comprising stators and rotors having a plurality of north poles and south poles and methods of controlling the same. A first sensor and a second sensor are provided. The first and second sensors are disposed on the stator in a manner that the first and second sensors never simultaneously detect boundaries between the north and south poles during rotation of the rotor. If any one of the first and second sensors continuously detects a north pole or a south pole for a predetermined duration, the motor is shut off.

Abstract: As a boosting-type motor driving device using no reactor, a motor driving device capable of controlling boosting operation and motor driving at the same time is provided, and an automobile using the motor driving device is also provided. The motor driving device is used for driving a motor with a double-winding structure having a first set of three-phase windings and a second set of three-phase winding which are wound over a stator, and includes first and second inverters, which are connected respectively to the first set of three-phase windings and the second set of three-phase windings, thereby controlling the first and second inverters to control a driving force of the motor with the double-winding structure. The first and second inverters have positive and negative terminals which are connected respectively in common to a high-voltage battery.

Abstract: Methods and apparatus for controlling a polyphase motor in implantable medical device applications are provided. In one embodiment, the polyphase motor is a brushless DC motor. The back emf of a selected phase of the motor is sampled while a drive voltage or the selected phase is substantially zero. Various embodiments utilize sinusoidal or trapezoidal drive voltages. The sampled back emf provides an error signal indicative of the positional error of the rotor. In one embodiment, the sampled back emf is normalized with respect to a commanded angular velocity of the rotor to provide an error signal proportional only to the positional error of the motor rotor. The error signal is provided as feedback to control a frequency of the drive voltage. A speed control generates a speed control signal corresponding to a difference between a commanded angular velocity and an angular velocity inferred from the frequency of the drive voltage.