Abstract: A stator for an electric machine includes multiple conductive coils. Each coil defines a loop that extends axially through the elongate core, exits the core through an end face, and reenters the core through the end face. A first subset of the coils collectively form a first radial layer axially exterior the core and a third radial layer axially exterior the core. Each coil in the first subset resides in both the first layer and the third layer. A second subset of the coils collectively forms a second radial layer axially exterior the core and a fourth radial layer axially exterior the core. Each coil in the second subset residing in both the second layer and the fourth layer.

Abstract: An electric machine system includes an electric machine and a companion device. The electric machine has a stationary member and a movable member that, by interaction of magnetic fields, at least one of moves relative to the stationary member or generates electricity when moved relative to the stationary member. One of the stationary member and the movable member comprising a permanent magnet. The companion device is coupled to the electric machine to communicate mechanical movement with the movable member. In certain instances, the electric machine system has adaptations for operation of the electric machine system subsea and/or in a corrosive environment. The electric machine includes a stator that carries a conductive winding having multiple coils. A first subset of the coils are in a first configuration, and a second subset of the coils are in a second configuration.

Abstract: This invention relates to a bearingless constant frequency phase locked generator adaptable of variable torque. With a reasonable combination of rotor poles and stator poles configured with U type permanent magnets and windings respectively, this novel generator can, with no need for acceleration of gearbox and sequential electrical controls, produce constant frequency constant voltage output, and is capable of auto phase (of the grid, for example) tracing and/or locking through the electrical control of the turn on/off of individual stator windings. Further a bearingless design is adopted and initiative suppression of axis vibration can be achieved. This generator has a relative simple structure, lower cost and high wind energy conversion, and is adaptable for a wide range of wind speed. This generator can be connected to grid directly and is suitable for wind power generation and other applications.

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 motor comprises: a rotor; a stator; and brush gear. The rotor has a shaft, a rotor core and a commutator fitted to the shaft. The rotor core has 5n teeth, n being a positive integer. Two coils are wound in each tooth with each coil being wound about a single tooth and having two ends. The commutator has 10n bars forming a brush contact surface. The stator comprises a yoke and a plurality of permanent magnets installed at an inner surface of the yoke and facing the rotor core. The brush gear has a plurality of carbon brushes arranged to make sliding contact with the brush contact surface of the commutator. The ends of the two coils wound in each tooth are respectively connected to two pairs of adjacent bars and the center line between one pair of the two pairs of adjacent bars and the center line between the other pair of the two pairs of adjacent bars are diametrically opposed.

Abstract: An axial gap EDM deploys as a stator coils a series of two parallel serpentine windings that each circumscribe an arc segment of a circle. Each arc segment that forms the stator winding assembly is powered as a separate phase. The two winding are readily formed by shaping one or more wire segment. Preferably the parallel winding are arranged to overlap with a half period rotational offset such that the radial directed serpentine segments of that are disposed above and below the stator disk are interlaced when viewed in projection through the disk. In one embodiment, each series of serpentine winding are separated by a gap so that they can be inserted on the stator disk from the edge. A separate rotor disk is adjacent each side of this stator disk. In another embodiment, each series of serpentine winding are separated by a gap, so they can be inserted to surround a single rotor disk which has two series of magnets disposed on opposite sides.

Abstract: An electrical rotating machine with permanent magnets which is configured such that the ratio of the number of magnetic poles of permanent magnets 3 to the number of magnetic poles of coils 12 is at 10:9 or 8:9. The coils 12 are configured such that a middle coil U? and two adjacent coils U+, U+ on both sides thereof are in-phase connected to be in-phase coils for each phase, and there is satisfied the relationship that T2>T1 and T2>T3, where T2 is the turn number of the middle coil U?, and T1 and T3 are the turn numbers of the adjacent coils U+, U+.

Abstract: A stator having a stator core and coils is disclosed. The stator core includes split core pieces each having a tooth portion. The split core pieces are arranged annularly such that the distal ends of the tooth portions face radially inward. A lead wire is continuously wound about an adjacent pair of the tooth portions such that coils of different phases are formed in the circumferentially adjacent tooth portions, so that a plurality of connecting wires are provided, each connecting wire connecting coils of different phases. The connecting wires are connected to one another while being connected to one another, such that a neutral point is created.

Abstract: A motor stator includes a stator core stack having a core back and a plurality of teeth extending from the core back in a radial direction of the core back. The motor stator also includes winding wires wound around the teeth and having no bonding layer. Only winding wires of the first and third phases are wound to prevent loosening thereof.

Abstract: An alternating current machine which generates a magnetic field or induces a voltage. In one the machine includes a stator and a rotor positioned about an axis. The stator includes three sets of coils, each set including at least a first pair of coil rows wired in series, with first and second members of the first pair configured to generate axial fields in opposite directions. Coil rows in the first pair of each set of coils are each arranged a different distance from the axis. A first member of the pair of the second set of coil rows is positioned between the first and second members of the pair of the first set of coil rows. The distance between the axis and the first member of the second pair of coil rows is intermediate the distances between the members of the first pair of coil rows and the axis.

Abstract: There is provided a generator which produces electromotive forces in the same direction on all windings to prevent occurrence of leakage magnetic fields of the windings and lowering of the rotational forces of rotor plates due to the leakage magnetic fields from the windings and offers high efficiency without accompanying any circuit loads.

Abstract: In a rotary electric machine, coils to be wound around an armature are wound so as to have a good magnetic balance. In a rotary electric machine formed with four poles, ten slots, and twenty commentator segments, a pair of coils that respectively conduct an electric current to the commutator segments adjoining an arbitrary commutator segment at both sides in the circumferential direction are caused to face permanent magnets, that are adjoining poles, to be poles opposite from each other, and one coil is wound in a normal winding state, and the other coil, in a reverse winding state.

Abstract: The present invention provides a dynamoelectric machine that can reduce 12 f vibrational force and suppress generation of irritating electromagnetic noise in a vicinity of 2,000 Hz in an idling state. In the present invention, an armature winding includes first and second three-phase windings, the first three-phase winding is configured by delta-connecting respective phase windings, and the second three-phase winding is configured so as to be Y-connected to the first three-phase winding by connecting respective phase windings in series to respective output ends of the first three-phase winding. The first and second three-phase windings are each installed in the stator core such that respective phase currents have a phase difference from each other.

Abstract: An armature where at least one of a first winding wire and a second winding wire is wound around slots that are opposed to all magnetic poles serving as a same magnetic pole in a predetermined winding direction so as to correspond to a predetermined winding number as a total winding number between respective slots, so that the plurality of coils are formed, and a slot from which the first winding wire is led out and a slot into which the second winding wire is led are located circumferentially at both sides of commutator segments with which the first winding wire and the second winding wire are conductive.

Abstract: A spindle motor is provided for reducing or eliminating RRO and NRRO. Radial forces on the spindle motor are reduced or eliminated, and the net rotational torque is increased. Read and write heads may be placed increasingly closer to a memory storage disc surface, and are accurately aligned with the disc storage tracks. This allows increased track densities, and also allows for smaller discs and increased storage capacity of discs. In an aspect, a first stator tooth and a second stator tooth are positioned to generate substantially equal and opposite radial forces on the spindle motor. The first and second stator teeth are also simultaneously energized to cause the interaction of the stator with the magnet. In another aspect, the first stator tooth is positioned 180 degrees circumferentially about the stator from the second stator tooth, and axially above the second stator tooth.

Abstract: A method for producing a magnetically excitable core for an electrical machine, by which in a method step (S1), the core, having a substantially parallelepiped shape with slots extending parallel on one side, is furnished, into whose slots, in a method step (S2), the core winding is inserted by its winding sides, and then in a method step (S3), the core together with the core winding is reshaped into a cylindrical ring shape with radially inward-oriented slots, is proposed. The method is characterized by a further step, according to which in each case all winding sides that are inserted into each slot are pressed into a slot shape in a tool and reshaped before being inserted into the slot.

Abstract: The invention relates to an electrical machine (10), and to a method for producing such an electrical machine, especially for adjusting mobile parts in a motor vehicle. Said machine comprises a rotor (20) on which a bipolar electrical winding (25) having a plurality of coils (26) is arranged. Said coils (26) are configured to give two symmetrical coil sections (27) each which are disposed symmetrical to each other relative to the axis of rotation (23) of the rotor (20), both coil sections (27) being simultaneously commutable.

Abstract: A multi-speed single-phase induction motor including a stator having a main winding selectively adapted for 2n-pole operation and 6n-pole operation, where n is an integer. The main winding includes a plurality of coil sets. The motor is configured to energize at least one of the coil sets during 2n-pole operation and during 6n-pole operation.

Abstract: In a rotary electric machine having a field winding wound on field magnet iron cores, and an armature with an armature winding connected in series with the field winding through a pair of brushes and a corresponding pair of connecting leads that are electrically connected to the brushes, a balance winding for equalizing the magnetic field strengths of the field poles is wound around successive field magnet iron cores and thereby retained, and has one end thereof fixedly attached to and electrically connected to one of the connecting leads and the other end electrically connected to and fixedly attached to the other connecting lead.

Abstract: The electrical machine (1) has a stator (2), which has slots (6) distributed about the periphery, between which a tooth (7, 8) is placed, and in which a winding system (9) with at least one winding phase is placed. Each winding phase contains at least one coil group. Each coil group contains a first single coil (10) and at least one additional coil (11). All single coils (10, 11) of each coil group are electrically connected in series. Each of the additional single coils (11) is arranged in an offset manner with an offset angle (?mk,i) in relation to the first single coil (10). The respective offset angle (?mk,i) is calculated according to: formula (I) in which k ? {1,2, . . . (n-I, i ? {0,1, . . . (6-pN-1)}, n being a group coil number of all single coils (10, 11) of the respective coil group, k being a coil index of the additional single coils (11), i being a position index, and pN being an effective pole number.

Abstract: A magnetic member with an annular outer periphery and an inner periphery includes first portions and second portions alternately disposed in its circumferential direction. The first portions and second portions are magnetically separated in the circumferential direction by gaps, which block magnetic fluxes from flowing in the circumferential direction between the first portion and second portion. The first portions respectively have holes extending almost in the circumferential direction. The gaps are provided at both ends of the holes in the circumferential direction between the outer periphery and inner periphery. An interior permanent magnet type rotor can be structured by inserting field magnets into the holes.

Abstract: A motor and a compressor including the same. The motor includes a rotor (120) and a stator (110). Stator coils are wound around the stator (110). The stator coils include a main coil (112) and a sub coil (114) formed of material having a different conductivity from the main coil. A compressor for compressing fluid includes the motor.

Abstract: A three-phase DC brushless motor and coil winding method provide a coil winding enabling consistent starting with PWM sensorless driving by suppressing the DC offset component of the induced voltage resulting from an imbalance in the motor coil windings. The method of winding the armature winding of the three-phase DC brushless motor renders the difference in mutual inductance substantially zero.

Abstract: A rotation control motor comprises a shaft, an armature having an armature core of which teeth are wound by wires to form coils, a commutator, and a field magnet. The armature core has a plurality of teeth, the commutator has a plurality of commutator segments corresponding to the number of teeth, and the coils comprise a normal coil and a brake coil. When the motor rotates faster than expected, the brake coil brakes the motor by magnetic flux, and the motor can rotate within a stable speed range.

Abstract: An electric generator includes at least first and second stator units aligned along a stator axis, and a rotor. Each stator unit includes a stator core having a plurality of angularly spaced-apart coil mounting arms that extend in radial outward directions relative to the stator axis, a plurality of field coils each wound on a respective one of the coil mounting arms, and an insulator unit disposed between the field coils and the stator core so as to provide electrical insulation therebetween while permitting electromagnetic coupling therebetween. The first and second stator units are arranged side by side along the stator axis such that the coil mounting arms of the first stator unit are angularly displaced with respect to the coil mounting arms of the second stator unit. The rotor is coupled rotatably to the first and second stator units for inducing electrical currents in the field coils.

Abstract: In an armature, the upper and lower coil pieces in one half of the parallel circuits are located at the 1st, 4th, 6th, 7th, 9th, 12th and 14th positions, and the upper and lower coil pieces in remaining half of the parallel circuits are located at the 2nd, 3rd, 5th, 8th, 10th, 11th and 13th positions, when relative positions of the upper and lower coil pieces in each phase belt are indicated by positions counted in a direction separating away from a pole center.

Abstract: Object of the invention is to provide an improved technique for winding a wire to form an armature winding between a commutator and an armature. Representative motor is provided with a motor with an armature having slots, a commutator, and segments on the commutator and an armature winding having first and second unit windings. The first unit winding is defined by a first to a third segments, a coil of a first group and a coil of a second group in series, and a first equalizing wire. The second unit winding of the motor is defined by a third to a fifth segments, a coil of a first group and a coil of a second group for the second unit winding, and a second equalizing wire. The coils are disposed in series with this order and in a position shifted from the coils of the first and the second groups for the first unit winding. The third segment defines an endpoint of the first unit winding and also defines a starting point of the second unit winding.

Abstract: In an electric motor having high-speed and low-speed brushes, durability is improved and vibration/noise is reduced. The electric motor has a low-speed brush 21a, a high-speed brush 21b, and a common brush 21c. Formed in the electric motor are a first coil 7A1 which is wound between given slots 11, and a second coil 7A2 which is wound in a direction opposite to a direction of the first coil 7A1 between slots 11 existing at positions point-symmetric to the given slots 11 with respect to a center of a rotation shaft. An armature coil 7 is formed by the first and second coils 7A1 and 7A2. If the armature coil 7 is short-circuited by the high-speed brush 21b, the first coil 7A1 and the second coil 7A2 of the short-circuited armature coil 7 exist at positions symmetric to each other with respect to an axis line extending through the center of the high-speed brush 21b and the center of the rotation shaft.

Abstract: To provide an aircraft propulsion system which can secure the optimum thrust and thrust vector for flight conditions, as well as the optimum sectional area for the engine, and which is highly compatible with the environment. An electrical generator is coupled to a turbofan engine, the electrical generator is driven by output power of the turbofan engine to output electric power, and an electromagnetic driving fan is driven by the electric power. On the other hand, after bringing each of coils in the electromagnetic driving fan to a superconductive state, liquid hydrogen is introduced to a heat exchanger, collects the energy of exhaust as heat, is then vaporized, and thereafter supplied to a combustor and to a fuel cell. Further, the electromagnetic driving fan is changed in its rotational phase by a rotating mechanism portion, is made movable in a width direction of a wing and a wing chord direction by a slide mechanism portion, and can be stored inside or outside the wing by a storage mechanism portion.

Abstract: A stator coil is configured of a first group of six turns of conductive wire, and a second group also of six turns, with the first group of six turns being wound on a spool, leaving a gap the same as the diameter of the conductive wire between winds. Upon completion of winding the first group, the winding is turned back, and the second group of six turns is wound in the gap, so as to be adjacent to the turns of the first group. The article is then inserted into a slot in a stator core of a stator, thereby configuring a stator coil. This provides for a rotating electrical machine and manufacturing method thereof with improved insulation resistivity regarding inverter surge voltage, and moreover high output can be obtained with a machine of comparable external dimensions with conventional machines.

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: A winding module for a motor includes at least one support and a plurality of windings positioned on and supported by the support. The windings are electrically connected to each other and include a plurality of wire connections. A packaging body encloses the support and the windings. The packaging body includes a mounting hole for receiving an axle tube of a motor. A plurality of electrical connection members are respectively coupled with the wire connections. Each electrical connection member is partially exposed outside the packaging body.

Abstract: A motor includes a stator which includes a stator core having an annular stator yoke, a plurality of outer teeth projecting outward from the stator yoke and a plurality of inner teeth projecting inward from the stator yoke, and a plurality of windings wound on the stator core. The motor also includes an outer rotor confronting the outer teeth with an air gap therebetween and an inner rotor confronting the inner teeth with an air gap therebetween. This motor thus has twin-rotor. The stator core includes outer slots between each one of the outer teeth as well as inner slots between each one of the inner teeth, and the windings are wound on the stator yoke between the outer slot and the inner slot. A cross sectional cut of the stator reveals that a sectional area of the outer slot is equal to that of the inner slot.

Abstract: A plurality of magnetic pole bodies, provided on a stator of a steering motor, are divided into two electrically independent groups. Each group includes i) six magnetic pole bodies that are arranged in succession and ii) a corresponding number of magnetic pole bodies arranged opposing those six magnetic pole bodies. The two groups vibrate only slightly when operating normally. However, if one of the groups fails, vibration of the stator from elastic deformation in an undulating manner in the circumferential direction will increase, thereby alerting the driver of an abnormality in the steering motor. This increases the likelihood of measures being taken promptly to fix the abnormality in the steering motor, thus improving fail-safe performance.

Abstract: A rotating electrical machine includes: a stator that includes two stator stages each constituted with a plurality of claw poles extending toward opposite sides along an axial direction at alternate positions and a ring-shaped core back that forms a magnetic path between the claw poles, the two stator stages being stacked over along the axial direction; a stator winding formed by winding a coil in a ring shape and disposed in a space enclosed by the claw poles and the core back at each of the stator stages; and a rotor rotatably disposed at a position facing the claw poles of the stator, and: stator windings corresponding to a plurality of phases are disposed together at least at one of the two stator stages.

Abstract: Disclosed are an elevator drive, a clamping arrangement for an elevator machine, a braking mechanism for an elevator system, and a rotor fixture for an elevator machine. The inventive elevator drive is subdivided into a number of segments, to each of which a converter is assigned.

Abstract: A method for making a polyphase rotating electrical machine stator, comprising an assembly of plates, slots, and a corrugated coil including a plurality of phase windings each formed with at least one continuous electrically conductive wire configured in successive recesses comprising a plurality of branches extending in a series of slots and a plurality of linking segments connecting the branches. The invention is characterized in that the method includes at least one first step during which the wires of the phase windings are arranged simultaneously on a dummy rotor and are during that same process configured into recesses, and a second step during which the dummy rotor is used for transferring the coil into the assembly of plates or for forming the stator.

Abstract: In an armature, the upper and lower coil pieces in the first and third parallel circuits are located at the 1st, 4th, 6th, 7th, 10th and 12th positions, and the upper and lower coil pieces in the second and fourth parallel circuits are located at the 2nd, 3rd, 5th, 8th, 9th and 11th positions, when relative positions of the upper and lower coil pieces in one of the first and second phase belts are indicated by positions counted in a direction separating away from a center of a pole.

Abstract: A brushless AC motor has a rotor, N stator pole group, and plural loop-configuration stator windings. The rotor has magnetic poles with alternating N poles and S poles circumferentially disposed at equal interval. The stator has plural stator poles divided to N stator pole groups. Each group is formed circumferentially on the stator with each of adjacent pairs of the groups mutually differing in circumferential position by a desired amount. The stator windings are formed circumferentially on the stator, with each winding disposed immediately adjacent to a corresponding one of the stator pole groups, with respect to a rotor axis direction. As an example, the stator pole has an approximate parallelogram shape in which a top side and a base side of the stator pole in axis direction of the stator has an approximately same width in rotational direction, and the positions of the top side and the base side is shifted in rotational direction to each other.

Abstract: The electric rotating machine includes a rotor around which a field coil is wound, and a stator including a stator core around which an armature winding is wound. The armature winding includes a first three-phase winding whose phase coils are delta-connected to form a delta winding, and a second three-phase winding whose phase coils are connected to corresponding nodes of the delta winding to form a star winding. The delta winding and the star winding are wound around the stator core such that the phase coils of the delta winding and the phase coils of the star winding share the same slots of the stator core.

Abstract: A motor includes a stator with an annular stator yoke, a stator core having a plurality of inner and outer teeth projecting from the stator yoke toward inside and outside respectively, a plurality of coils wound on the stator core, and an inner rotor and an outer rotor confronting the inner and outer teeth respectively via an air-gap, and having an permanent magnet respectively. The number of slots “S” and the number of poles “P” establish a relation of S:P=3:2N?1, where N is an integer equal to 1 or more, and a case when 2N?1 becomes a multiple of 3 is excluded.

Abstract: The present invention provides an electricity generator for a lighting tower having a plurality of discharge lamps, each lamp being of power greater than 750 W, the generator being arranged to be driven by an engine, the generator being a multiphase generator having n phases, where n is an even integer, each phase being independent in a magnetic circuit that is common to all of the phases and being configured to power one lamp, the generator comprising a rotor with permanent magnets, having 3 n poles, and a stator concentric with the rotor and subjected to the radial magnetic flux from the magnets, the stator comprising a stack of laminations of silicon iron having a silicon content greater than 0.5% and of individual thickness greater than 0.35 mm, defining 4 n magnetic circuit teeth, with every other tooth carrying a winding.

Abstract: A total number of windings in an armature is an even number. The windings are divided into a first winding group and a second winding group. The windings of the first winding group are arranged one after another at generally equal angular intervals without overlapping with each other. The windings of the second winding group are arranged one after another at generally equal angular intervals without overlapping with each other and are wound separately from the windings of the first winding group.

Abstract: A brush holder for a motor includes two elongated electrical conductors and a flexible, electrically-insulative brush-holder body which separately surrounds, and is strip-molded to, the conductors and which has a distal end portion including brush recesses. A motor is described which includes two support bearings axially located to one side of an armature core and a commutator and a brush holder axially located to the other side of the armature core wherein an armature winding includes a first portion at least partially axially overlapping a support bearing and a second portion at least partially axially overlapping the commutator and the brush holder. A motor system is described which includes a motor and an assembly having a component operatively driven by the motor wherein two support bearings are located to one side of an armature core, one attached to a motor end plate and one attached to an assembly housing.

Abstract: Electric motor systems are provided for use in vehicles. In an embodiment, by way of example only, the system includes a first inverter, a second inverter, and a motor electrically coupled to the first and the second inverters. The motor includes a stator including a plurality of slots formed therein and a plurality of windings. The plurality of windings is disposed at least partially in the slots, and each winding includes a first coil and a second coil. The first coil has a first number of turns, and the second coil has a second number of turns that is unequal to the first number of turns. The first coil of each winding is electrically coupled to the first inverter, and the second coil of each winding is electrically coupled to the second inverter.

Abstract: A stator assembly comprises a stator defining S slots. First and second windings are arranged in each of the S slots. The two windings have a width in a radial direction and a thickness in a direction perpendicular to the radial direction. A ratio of the width to the thickness is between 3.0:1 and 4.5:1.

Abstract: The invention describes an electrical machine having an armature with armature slots for accommodating armature coils. At least one armature coil is formed from two coil elements which are arranged symmetrically with respect to one another in relation to an axis of symmetry, which runs through the center-point of the armature shaft. The coil elements are connected to two adjacent commutator laminates of a commutator. A first brush, a second brush and a third brush bear against the commutator in a manner such that they can slide. The second brush interacts with the first brush or the third brush.

Abstract: A rotating electric machine includes a stator core of a cylindrical shape, a rotor core coaxially rotating inside the stator core, and a plurality of coils each formed by winding magnet wires using a slot formed axially in either the stator core or the rotor core, or both: it is preferable that each of the coils be split into a plurality of coil groups, that starting sections of winding of the magnet wires in one of the coil groups be wound adjacently to ending sections of winding of the magnet wires in another of the coil groups, and that the starting sections and ending sections of winding of the magnet wires in the two coil groups be connected at respective outgoing wire ends to one another, outside the slots.

Abstract: The invention relates to a permanently excited synchronous machine (51) comprising a stator (53) and a rotor (55). Preferably, the stator (53) comprises a three-phase current winding and the rotor (55) comprises permanent magnets. The stator (53) comprises 42 slots (27) and 42 teeth (29). Each second tooth (29) is wound with a coil (39). The rotor (55) comprises 26 magnetic poles. The permanently excited synchronous machine can be configured in such a way that the useful pole pair is a prime number.

Abstract: A wheel assembly includes a carrier and a wheel mounted adjacent to the carrier for rotation relative to the carrier. A first array of magnets is carried by one of the first side of the wheel and the carrier, and a first array of coils is carried by the other of the wheel and the carrier corresponding to the first array of magnets. A spinner is mounted adjacent to the wheel for rotation relative to the wheel. A second array of magnets is carried by one of the wheel and the carrier, and a second array of coils is carried by the other of the wheel and the spinner corresponding to the second array of magnets.