Abstract: A synchronous motor which has reduced torque ripple while having a high torque includes a rotor and a stator, and U-phase coils, V-phase coils, and W phase coils are wound around sections of the yoke each located between two adjacent stator teeth. The number of turns in each coil and the direction in which each coil is wound are set to compensate for a difference between a timing at which a magnetic field produced at each stator tooth is at a maximum value and a timing at which a point between magnetic poles passes by the stator tooth as the rotor rotates, the difference in timing being caused by a difference between the interval between the magnetic poles and the interval between the stator teeth.

Abstract: An electronically controlled, brushless DC, electromagnetic induction drive apparatus for use in a paintball marker active loader capable of directly driving the feeder element in the active loader while providing independently user selectable torque transfer capability and rotational speed whether used to continuously or intermittently rotate the loader feeder element. A plurality of selectively polarity reversible electromagnets are disposed in the loader housing and act to move a plurality of magnetic drive elements disposed on the rotating feed cone to rotate the feed cone a predetermined amount for each polarity cycle and cause paintballs to be fed into the paintball marker via a feed tube. A controller linked to the marker firing sequence manages the number and frequency of the sequential polarity changes of the electro-magnets to cause the feed cone to rotate in response to sensed movement of paintballs in the feed tube.

Abstract: A stator for a multi-phase electric motor comprises a plurality of teeth for each phase. The windings on two teeth from one phase are formed from a single length of conductor. The windings on a first one of the teeth being formed at least in part from two sections of the conductor spaced apart along the length of the conductor, and the windings on a second one of the teeth being formed from an intermediate section of the conductor between the spaced apart sections.

Abstract: An electronically controlled, brushless DC, electromagnetic induction drive apparatus for use in a paintball marker active loader capable of directly driving the feeder element in the active loader while providing user selectable torque transfer capability and rotational speed whether used to continuously or intermittently rotate the loader feeder element. A plurality of selectively polarity reversible electromagnets are disposed in the loader housing and act to move a plurality of magnetic drive elements disposed on the rotating feed cone to rotate the feed cone and cause paintballs to be fed into the paintball marker via a feed tube. A controller linked to the marker firing sequence manages the sequential polarity changes of the electro-magnets to cause the feed cone to rotate in response to movement of paintballs in the feed tube.

Abstract: An electrical motor or generator asymmetrical armature winding configuration generating a multi-phase balanced power output. Each winding group for each pole, and the conductors constituting each winding group, are chosen individually according to their magnetomotive force (MMF) vector relationship to provide a balanced power output even though the individual windings may not be balanced or symmetrical.

Abstract: An electric machine for direct drive or braking applications with coils providing improved power efficiency and heat transfer is disclosed. The electric machine has a coil body and a winding with a plurality of turns wound on the coil body. Each of the various turns is located in a separate plane. Respective end sections of two different turns are connected by a connecting element, with a major directional component of the connecting element being oriented in an axial direction perpendicular to the plane of one of the two turns. Axially adjacent turns can thereby be connected to one another together. This arrangement reduces or eliminates empty spaces in the slots, particularly when the turns are made from flat wire.

Abstract: A method of and a system for controlling a permanent magnet AC generator (10), wherein the generator is provided with stator windings and permanent magnets in the rotor and wherein the generator is connected to a drive unit (50), wherein the generator is further provided with a semiconductor converter provided with AC output connected to the generator output and a DC link for controlling the output voltage of the generator, and the converter is further provided with filter means for filtering the output of the converter so that a filtered output of the converter is fed to the generator output.

Abstract: An electric machine for direct drive or braking applications with coils providing improved power efficiency and heat transfer is disclosed. The electric machine has a coil body and a winding with a plurality of turns wound on the coil body. Each of the various turns is located in a separate plane. Respective end sections of two different turns are connected by a connecting element, with a major directional component of the connecting element being oriented in an axial direction perpendicular to the plane of one of the two turns. Axially adjacent turns can thereby be connected to one another together. This arrangement reduces or eliminates empty spaces in the slots, particularly when the turns are made from flat wire.

Abstract: In an automotive alternator according to the present invention, a curved portion for adjusting a height of a joining portion coil end of an inner winding portion and a height of a joining portion coil end of an outer winding portion so as to be generally equal, and adjusting a height of a linking portion coil end of the inner winding portion and a height of a linking portion coil end of the outer winding portion so as to be generally equal is disposed on conductor segments of at least the inner winding portion.

Abstract: Reconfiguration of stator winding sections of each phase of a multiphase motor is controlled for successive ranges of speed during which the motor can be expected to operate to obtain optimum operating efficiency throughout the entire operating range. All winding sections for a stator element are energized throughout the motor operating speed range but connected, through appropriate switches, in different circuit configurations for respective portions of the speed range. The switches are activated by a controller in response to a sensed motor speed signal. The reconfiguration of stator winding sections may be incorporated within a motor control system that is adaptive to control various motor parameters in response to sensed conditions as well as user input commands.

Abstract: The inner-rotor motor of the invention includes a rotor having plural magnetic poles disposed circumferentially, and a stator having a stator core with plural magnetic pole teeth facing to the rotor, located outside a circumference of the rotor, which have coils each wound around thereof. In this construction, the stator is placed within a central angel 180° with regard to a rotational center of the rotor, and the coils are set such that the numbers of turns of adjacent coils are unequal, and respective sums of the numbers of turns of the coils in respective phases are equal.

Abstract: A plurality of stator coils having coil ends are arranged on an annular stator yoke. Concentrically arranged connection conductors which are electrically insulated relative to one another have laterally projecting terminals for connecting to the ends of the stator coils. Receiving chambers arranged about the front side of the stator yoke receive the terminals of the connection conductors and fix the connection conductors in position. The receiving chambers are allocated to the coil ends which form an electric clamping connection by pairs with the terminals of the connection conductors at the receiving chambers.

Abstract: A variable speed motor includes a motor body having an axis, and a plurality of coil mounting parts that extend radially and that are angularly spaced apart relative to the axis. A run coil is mounted on the coil mounting parts. A starting winding includes first, second and third speed-changing coils mounted on the coil mounting parts, a set of first taps provided respectively on two coil terminals of the first speed-changing coil, a set of second taps provided respectively on two coil terminals of the second speed-changing coil, and a set of third taps provided respectively on two coil terminals of the third speed-changing coil. Each of the first, second and third speed-changing coils spans an angular length relative to the axis that is substantially equal to that spanned by the run coil.

Abstract: A stator winding is divided into segments enabling the stator current to be controlled to flow within a selected portion of the stator winding. The number of “active” turns of the stator winding, that is, the number of turns in which stator current is flowing, determines the motor performance, and thus the speed range over which the motor will operate efficiently. The overall speed range of the motor can be extended by selectively connecting a power supply across one or more segments to thereby dynamically adjust the number of “active” turns of the stator winding. A permanent magnet brushless DC motor incorporating the stator winding of the present invention can be designed having an overall performance characteristic that is similar to that of a series polar direct current motor. It has a higher torque at low speeds, providing good starting and climbing performance of a vehicle incorporating such a motor.

Abstract: In a switched reluctance motor and control system for such a motor, a rotor comprises four salient poles each having a width of about 50-degrees, and a stator has six salient poles each having a width of about 30-degrees. One Excitation winding is mounted around each stator salient pole and these are connected in series. An excitation drive circuit supplies a dc excitation current to each excitation winding to excite the motor in accordance with an excitation command signal. A torque-current drive circuit renders a current, whose magnitude in accordance with a torque command, to flow into torque windings mounted one round on each of the six stator salient poles successively according to the angle of rotation of the rotor.

Abstract: Disclosed is a stator of 2-phase step motor that has 4 stator coils, two in each phase. The coils are wound around 8 stator poles in a standard bifilar winding pattern. The first center-tap of the first phase and the second center tap of the second phase are connected. One end of the first phase makes a first terminal. One end of the second phase makes a second terminal. The other end of the first phase and the other end of the second phase are connected to make a third terminal. A three-phase driver can drive the step motor via these three terminals. Performance of the stator of the step motor can be improved by increasing the number of turns of the two coils whose ends make the first and second terminals. Then the three phase resistances of the stator can be adjusted to have similar resistances by reducing the wire gauge of the other two coils. This reduction of the wire size compensates for the space needed for the increase in the numbers of coil turns mentioned above.

Abstract: A brushless direct current motor includes a permanent magnet rotor and a set of stator windings. The motor further includes a circuit for changeably connecting the set of stator windings to operate in a first electrical configuration or a second electrical configuration. In the second electrical configuration, the circuit connects only some of the stator windings for receiving current. The circuit electrically isolates the unused stator windings from the used or connected stator windings.

Abstract: An axial airgap brushless motor including a rotor having a plurality of permanent magnet poles, and a stator having a plurality of conductor layers and a connecting layer for connecting the conductor layers. The motor is operated by exciting the conducting layers with three phase electric current. The current gives rise to conductor magnetic fields which interact with the rotating magnetic field of the permanent magnets. The magnets are spaced relative to one another to minimize the odd harmonics to thereby minimize torque ripple.

Abstract: An axial gap type electric motor includes a stator assembly having a plurality of stator coils fixed to a circuit board and a rotor assembly having a rotor magnet supported via a dynamic pressure gas bearing on the stator assembly. The stator coils are enclosed by a molding material into a single block. An upper face of the block opposed to the rotor magnet is rendered flat. Since the block of the stator coils has no irregularities that cause turbulent flows of air, flows of air flowing through a gap between the rotor magnet and the stator coils are rendered laminar. Consequently, windage loss can be reduced.

Abstract: An improved, brushless, slot-less DC motor is disclosed which includes a plurality of ring shaped permanent rotor magnets affixed to the motor shaft and magnetized to have contiguous pole faces extending about the circumference thereof. A module plastic housing impregnated with powder metal particles is provided as a magnetic shunt to eliminate prior art ferrite-oxide laminations while assuring concentration of the rotor's magnetic flux into coils positioned in the physical air gap between the rotor and stator housing.

Abstract: A field assembly for a motor includes a connecting terminal for making electrical contact with a point intermediate the ends of a field winding. A terminal board configuration provides pocket portions for engaging a turn of the winding, including the intermediate contact point, and for retaining the turn of the winding fixed relative to the assembly. The turn is brought out during a winding process and is engaged by one or more of the pocket portions. A frictional terminal is inserted into one of the pocket portions to provide frictional electrical connection to the intermediate point. The terminal boards are each configured to have a plurality of pocket portions. Pocket portions engaging and providing electrical contact with ends of the winding are arranged on terminal boards mounted on one end of the assembly. Pocket portions engaging and provicing electrical contact with the intermediate point on the winding are arranged on a terminal board mounted on an opposite end of the assembly.

Abstract: A speed-changing device for electric ceiling fans includes a run coil for electrical connection to a motor of a ceiling fan, and a starting and speed changing coil, together with a starting capacitor, parallel-connected to the coil. The starting and speed-changing coil includes a set of medium-speed taps and a set of low-speed taps, forming three speed-changing coils, in which speed-changing connections can be switched without producing any noise from the motor, by maintaining the same current direction after switching.

Abstract: An electronically commutated motor for energization by DC in both a high speed mode and a low speed mode at a current not significantly greater than a preselected level. The motor stator has a plurality of winding stages each with a plurality of winding turns only a first portion of which is commutated in a first sequence in a high speed mode and a predeterminately greater portion of which is commutated in a second sequence different from the first when the motor is energized in the low speed mode. A permanent magnet rotor is rotatably driven in one direction in the high speed mode so as to develop a first torque at the preselected current level when only the first portion of the winding turns of the winding stages are commutated in the first preselected sequence.

Abstract: A substantially constant frequency self-regulated generator produces in one embodiment 120 volts or the like single phase output or in another embodiment 120 or 240 volts or the like single phase output. The generator employs an exciter stator and a stationary rectifier assembly with the former being a six pole exciter stator alternately wound with three shunt poles and three series poles with two separate windings on each series pole. The three shunt poles of the exciter stator are connected in series making, in effect, one shunt winding. The series circuit consists of two separate windings on each series pole, which are respectively parallel connected and wound on all three series poles. Each series pole then has two separate isolated coils. With the exciter stator there is employed a stationary diode assembly utilizing three diodes as rectifiers for the shunt and isolated series windings.

Abstract: A self-starting rotary converter for connection to a single-phase a.c. power source and for supplying polyphase current to a polyphase electrical load. A generally annular polyphase stator has a predetermined number of poles and at least three stator windings symmetrically oriented physically and electrically. An induction rotor positioned within the stator rotates about a central axis thereof when the stator is energized by single-phase a.c. power. One of the stator windings has at least one electrical tap positioned intermediate its ends, and a second stator winding has one of its ends connected to the tap to effect electrically nonsymmetrical operation of the stator. This maintains the currents supplied to the phases of the polyphase load at its maximum rating substantially balanced.