Abstract: A cooling device comprising a heat pipe (6) which is provided with an electrically-isolating part (15) between the evaporating (8) and condensing (7) parts thereof, such that the hot and cold areas are isolated electrically from one another. The evaporating part (7) of the heat pipe (6, 60, 61) is connected to a voltage regulator (2) or to a current rectifier belonging to a rotating electric machine. The invention is suitable for an alternator or an alternator-starter.

Abstract: A motor having an improved mounting structure is composed of a rotor including a rotor yoke; a stator including a bearing, a bearing holder and a base plate fixed to one end portion of the bearing holder; a shaft fixed to the rotor yoke and a damping member interposed between the bearing holder and the base plate. The bearing is fixed to the bearing holder. The rotor is supported through the shaft so as to be rotatable freely with respect to the stator. The bearing holder is fixed to the base plate with having a first area in which the bearing holder directly contacts with the base plate and a second area in which the damping member is interposed between the bearing holder and the base plate.

Abstract: The stator (24) of a permanent magnet axial flux alternator comprises two annular stator components which are each wound with a respective two phase winding arrangement (48). Each of the two phase winding arrangements (48) is wound so that there is no mutual inductance between the windings of each phase. Each phase of the two phase winding arrangements (48) wound on the two stator components has a high internal impedance and is for energising a respective high intensity lamp of a light tower.

Abstract: When a pitch between centers of two adjacent magnetic pole portions disposed on an armature is defined as ?s, the length W of permanent magnets disposed in the middle is equal to the pitch ?s (W=?s). The length of each of the two end permanent magnets respectively disposed at either end of a permanent magnet magnetic pole row is denoted by W1. A ratio w1/W of the length W1 to the length W is defined as 0.43<W1/W<0.49. With this definition, cogging torque of a linear motor may sufficiently be reduced.

Abstract: A stator of an electric motor is formed by a plurality of split stators that are divided in a circumferential direction of the cylindrical stator. Each split stator comprises a yoke portion that is divided in the circumferential direction, a tooth portion that extends from the yoke portion a in a radial direction, and a coil wound on the tooth portion. The coil is pressed into the coil-housing portion, defined by the yoke portion and the tooth portion, by a press die. While the coil is pressed into the coil-housing portion by the press die, the coil may be covered by, for example, being integrated with a resin. Thus, the risk of damaging the coating of the coil is significantly reduced, the coil density is improved, and good circularity of the stator is ensured.

Abstract: An alternator for a vehicle has a rotor with a field wiring, a stator with a three-phase stator wiring, a regulator, and a rectifier. The regulator and rectifier are disposed away from each other with the rotor between. An alternating current is generated in the stator wiring in response to a rotation of the rotor and a field current received in the field wiring. The rectifier converts the alternating current into a direct current and outputs the direct current as an electrical energy generated in the alternator. The regulator regulates a value of the filed current to control the electrical energy. The rectifier acts as a heat generating member, but heat generated in the rectifier is hardly transmitted to the regulator disposed away from the rectifier.

Abstract: A lithographic apparatus has a patterning support constructed to support a patterning device and a substrate support constructed to support a substrate. At least one of the patterning support and the substrate support is moved by an electromagnetic actuator. The actuator has a first part and a second part that are movable relative to each other. The first part has a coil structure, and the second part including a plurality of permanent magnets interacting with the coil structure. The second part is provided with a cooling structure arranged adjacent the permanent magnets. Cooling ducts are arranged between adjacent permanent magnets, or on a side of the permanent magnets facing the coil structure.

Abstract: A magnetic path closed electric generator includes a base (9), a housing (8), a stator (3), a rotator (5), a rotation shaft (7) and a transmission wheel. A magnetic permeability neck (12) is fixed on the stator; a coil winding (2) on the stator is fixed on the magnetic permeability bracket (1) and hitches outside a magnetic permeability neck; a low magnetic permeability medium (13) is disposed between the magnetic permeability bracket and the magnetic permeability neck. When the rotator rotates, a magnetic body (4) rotates along with it. The magnetic permeability neck is inducted to permeate magnetic and generate electric current with change of flux passing through the coil winding. A magnetic field generated by the electric current in the coil winding passes through the magnetic permeability bracket. The coil winding on the stator and the magnetic body on the rotator form a magnetic line closed loop in their own magnetic field. There is only small magnetic attracting force between the rotator and the stator.

Abstract: Objects of the present invention is to provide an outer rotor of a motor for a direct drive drum type washing machine, in which a structure of the outer rotor is improved, to resolve throbbing of the outer rotor at the time of high speed rotation, and consequential noise, and to provide a variety of products. For this, the outer rotor having a rotor frame with a bottom, a side wall extended from a circumference of the bottom substantially perpendicular to the bottom, and magnets mounted on an inside of the side wall, wherein the bottom of the rotor frame is elevated in a direction of extension of the side wall on the whole.

Abstract: A compact, high power, power conversion apparatus including a rotor and a stator. The rotor includes a cylindrical casing, and a predetermined number of permanent magnets disposed on the casing, and is adapted for rotation about the axis of the casing. The stator includes a core and a plurality of sets of conductive windings, each set including a predetermined number of individual conductive windings and associated with an electrical phase. A respective collecting conductor is associated with each set of conductive windings, with each individual conductive winding of the set being electrically connected to the associated collecting conductor. The respective collecting conductors are disposed in a coolant flow path a coolant flow path directing coolant into contact with the stator windings, electrically isolated from each other and spaced apart from each other and from the windings. Collecting conductors in the form of continuous rings and in the form of a plurality of arcs are disclosed.

Abstract: A vibrational energy harvesting apparatus comprising: a substrate having a plurality of integral compliant regions; at least two ferromagnetic masses each coupled to a corresponding one or more of the integral compliant regions such that at least one of the ferromagnetic masses moves with respect to the substrate responsive to substrate acceleration, each ferromagnetic mass having an inner magnetic pole disposed such that the inner magnetic poles are separated by a gap, wherein the magnetic polarities of the inner magnetic poles on the opposing sides of the gap are similar; wherein the inner magnetic poles form a steep flux gradient region in and around the gap; and a coil coupled to the substrate and disposed within the steep flux gradient region where it is exposed to a changing magnetic flux arising from motion of at least one of the ferromagnetic masses with respect to the substrate.

Abstract: In a motor having a pawl-shaped magnetic pole, if a coil is wound like a ring shape so as to be formed, one leader line can be generally drawn out to an external portion from a position close to an outer periphery of a stator, however, the other leader line is drawn out to the external portion from an inner periphery of the stator. Accordingly, the leader line occupies a part of the inner space formed by the stator core, so that there is generated a problem that a space factor of the coil is reduced. Accordingly, an object of the present invention is to improve the space factor of the coil. In order to achieve the object mentioned above, a space passing wirings of a plurality of coils therethrough is provided in a part of the pawl-shaped magnetic pole of the stator core of the stator having the pawl-shaped magnetic pole.

Abstract: An electric motor has a field assembly, such as a stator, for a dynamoelectric machine has field coils that are wound to a net shape. Lead wires are brought out from the ends of each field coil. The field coils are insulated with insulating sleeves or insulating slot liners. The field coils are assembled with stator core pieces, such as pole pieces and return path pieces, into the stator. The stator core pieces are formed prior to being assembled with the field coils. In an aspect of the invention, the pole pieces and return path pieces are separately formed and then assembled together with the field coils, which have also been separately formed.

Abstract: A modified armature winding for a stator of an electrical generator having a pigtail shape to promote cooling of the stator. At least one turn of the windings is extended outside the circumferential periphery of the stator, preferably forming a loop. An electrical short is created near the circumferential periphery of the stator between the winding segments to prevent current from flowing through the pigtail winding segment.

Abstract: A motor used to drive optical elements includes a stator, a rotor revolved relative to the stator, and a feedback apparatus used to sense the position of the rotor. The feedback apparatus is an encoder. Such described structure eliminates the system's instability caused by the drift of a conventional capacitive type transducer or an inductance type transducer. Moreover, the response of the motor used to drive optical elements has been improved greatly by utilizing a multipole motor.

Abstract: A power converter that is arranged in series with a motor to form a unitary structure through which an output shaft extends is provided with a plurality of coolers and a power semiconductor module mounted on a cooling surface of at least one of the plurality of coolers to supply electric power to a motor. Each of the plurality of coolers is disposed along an extending direction radially extending from an output shaft to be perpendicular to the output shaft. The cooling surface is provided along such an extending direction.

Abstract: The invention relates to a device for mounting an electric motor (10) in a manner that isolates vibrations, in particular a fan motor, wherein the electric motor (10) features at least one pole housing (12, 14) serving as a magnetic yoke circuit, as well as means (26, 27) for fastening isolating elements (32, 33), in particular elastic isolating elements. In accordance with the invention it is proposed that the means (26, 27) for fastening the isolating elements (32, 33) are embodied to be a single piece with the pole housing (12, 14).

Abstract: An electrical machine is described, having a stationary main element as stator and a rotating main element as rotor, of which one main element having a magnetic yoke and poles, of a predefined number of poles, projecting radially from the former, is made of SMC material and carries a pole winding on each pole. To achieve cost-effective manufacturing of the main element, the main element is assembled from at least two modules that are axially adjacent, rigidly connected to one another, and produced from SMC material, each module having a yoke part, closed in on itself, of the magnetic yoke having an equal number of divisions of poles attached thereto in one piece, which corresponds to a fraction of the number of poles determined by the number of modules.

Abstract: The present invention relates to an electrical drive unit with an electric motor and a transmission, wherein the motor has a rotor shaft (6), to which a rotor (10) and a commutator (11) are fitted in a manner fixed against rotation, wherein a commutator sliding contact (23) is provided in order to make contact with the commutator (11), and wherein an electrical connection is provided between an electrical terminal (18) and the commutator sliding contact (23). According to the invention, one cable and one special step in the manufacturing process are dispensed with by virtue of the fact that the electrical connection runs via the rotor shaft (6).

Abstract: In the present invention the positions of the slots or poles of the stator of an electric motor are changed in order to reduce the harmonics caused by the stator winding and any vibration caused by these harmonics. In the present invention a shape function is defined according to the new placement positions for the stator slots and/or stator poles. A conversion function sums for the slot placement positions to be given to equidistant stator slotting placement. In one embodiment of the invention the conversion function is the sum of sinusoidal functions and in its amplitude small in relation to the distance between the slots.