Abstract: A cooling system of an electromechanical actuator is provided. The cooling system includes a housing and a stator located within the housing and defining a central bore. A first body including a sleeve portion is configured to extend into the central bore of the stator, with the first body defining a first chamber including a first cavity within the sleeve portion and a second cavity fluidly connected to the first cavity. A heat sink is provided in thermal communication with the second cavity.

Abstract: A rotating machine has a shaft rotatable about an axis, a rotor rotatable with the shaft, and a rotor end winding at an axial end of the rotor. A stator is spaced from the rotor and forms a gap therebetween. The stator comprises a stator winding. A fluid system directs fluid through to the stator. A baffle to diverts fluid away from the gap and toward the stator.

Abstract: Performance of an electric motor can be improved if coolant is provided to the coils of the stator. An electric motor is disclosed that has a shaft onto which the rotor is secured. The motor has a stator that is mounted on bearings that are mounted on the shaft. The stator has a plurality of coils. A coolant guide is provided that fills voids between the groups of windings. The coolant guide has a plurality of fingers with the fingers arranged between adjacent pairs of coils. The coolant guide has internal passages to accept pressurized coolant and outlet holes to spray coolant onto the coils. In other embodiments, the fingers guide coolant to reach all coils under the force of gravity.

Abstract: For improved water resistance, the stator assembly of a d.c. brushless motor is encapsulated in an overmolding formed from a mixture of a thixotropic, flexible epoxy resin and glass fibers. The overmolding may be applied to the stator assembly by a vacuum pressure impregnation process. The overmolding may also encapsulate a Hall effect circuit board and sensors of the motor.

Abstract: The present invention is a high efficiency permanent magnet machine capable of maintaining high power density. The machine is operable over a wide range of power output. The improved efficiency is due in part to copper wires with a current density lower than traditional designs and larger permanent magnets coupled with a large air gap. In a certain embodiment wide stator teeth are used to provide additional improved efficiency through significantly reducing magnetic saturation resulting in lower current. The machine also has a much smaller torque angle than that in traditional design at rated load and thus has a higher overload handling capability and improved efficiency. In addition, when the machine is used as a motor, an adaptive phase lag compensation scheme helps the sensorless field oriented control (FOC) scheme to perform more accurately.

Abstract: Various embodiments provide a system for moving optical elements. The system includes a first rotor and a second rotor configured to rotate in opposite directions. The system further includes a first plurality of paddles coupled to the first rotor, each of the plurality of paddles having an aperture configured to receive a first optical element, and a second plurality of paddles coupled to the second rotor, each of the plurality of paddles having an aperture configured to receive a second optical element. The first rotor and the second rotor are configured to move the first optical element between a retracted position and a desired position and to move the second optical element between the desired position and a retracted position substantially simultaneously such that a reaction torque of the first rotor cancels a reaction torque of the second rotor.

Abstract: An air purge system includes an electric motor having an air purge device which supplies air to a space around the outer peripheral surface of an output shaft, an information acquisition unit which acquires operation information of the electric motor, and an air control unit, which controls the amount of air supplied from the air purge device in response to the acquired operation information. The air control unit increases the amount of the air supplied from the air purge device when the information acquisition unit acquires deceleration operation information of the electric motor.

Abstract: A liquid cooled generator is provided having a rotor having a central core and a main stator winding wrapped around the central core. A first laminate at a first end of the central core is provided having a first orifice defining a first diameter and a second laminate at a second end of the central core is provided having a second orifice defining a second diameter that is the same as the first diameter. A flow line passes through the central core and is configured to extend from the first laminate to the second laminate, the flow line defining a third diameter that is larger than the first and second diameters. The first and second diameters are configured such that air flow is permitted to pass through the first and second laminates and to restrict the flow of a liquid through the first and second laminates.

Abstract: The present invention refers to a linear engine for compressor, and to a compressor provided with a linear engine. The linear engine for compressor comprises at least a stator consisting of a first core (2) and a second core (3), and at least a cursor (4), wherein said first core (2), cursor (4) and second core (3) are concentrically disposed. Said first core (2) is substantially defined by at least two different bodies (21, 22) and provides attaching means (6, 7) between said two bodies (21, 22).

Abstract: Segment coils arranged as aligned in slot portions of an annular core each include a straight portion and a pair of coil end portions, and have a tip end of the coil end portion of the pair of coil end portions as a tip end portion for joint including a joint surface for joint to another segment coil. The tip end portion for joint has the joint surface in parallel to a radial direction of the annular core when viewed in an axial direction of the annular core.

Abstract: A motor structure is provided. The motor structure has: a motor; a circuit board including a driver circuit for controlling the motor; an upper shell; a base; a lower shell; an outlet, wherein wires of the circuit board is connected to the exterior of the motor structure through the outlet; a first tight chamber, formed by closing the upper shell and the base together, wherein the motor is disposed in the first tight chamber; and a second tight chamber, formed by closing the base and the lower shell together, wherein the circuit board is disposed in the second tight chamber.

Abstract: A vibration power generator in which an electret group including a plurality of electrets and an electrode group including a plurality of electrodes are displaced in a relative movement direction by an external vibration, and vibration power generation is thereby performed, has a housing portion that accommodates the electret group and the electrode group, a fixed member that is fixed to a bottom surface side of the housing portion and has one of the electret group and the electrode group as a fixed member-side power generation element, a movable member that is accommodated in the housing portion so as to be capable of relative movement by the external vibration while opposing the fixed member, and has the other of the electret group and the electrode group as a movable member-side power generation element, and a plurality of support members.

Abstract: A rotor core (100, 110) for an electrical motor with a rotational axis (6) and a central opening (200) to take up a shaft (4) of the electrical motor turning around the rotational axis (6), with the central opening (200) having a peripheral edge (201) with at least one attachment section (242), designed for attachment of the rotor core to the shaft by press fit, and at least one centering section (244), wherein the at least one centering section (244) and the at least one attachment section (242) are placed in different sections of the peripheral edge (201) in the circumferential direction (tangentially).

Abstract: An overmolded steel flux ring member for an eddy-current fan drive assembly. The flux ring member includes a base member having a hub member, an annular outer ring member, and a plurality of connecting arm members. An overmolding material, such as aluminum, is overmolded on the annular outer ring member preferably in separate sections. Ventilation openings in said base member allow air to flow past a magnet ring for cooling.

Abstract: A stator core is formed by deforming a core assembly having core pieces coupled in a strip form into an annular shape, and by joining both ends of the core assembly together to make a core-fastening portion. Individual phase windings are routed from one end of the core assembly toward another end. Lead portion (43v) of phase winding (40v) and lead portion (43w) of phase winding (40w) make up respective wire terminals. Lead portion (43u) of another phase winding (40u) is extended through a plural number of the core pieces in a direction of the lead portions (43v and 43w), and a wire terminal of the extended lead portion (43u) and the wire terminals of the other lead portions (43v and 43w) are electrically connected to provide a neutral point of three-phase Y-connection circuit.

Abstract: An electric machine, such as an Internal Permanent magnet or Synchronous Reluctance machine, having X phases, that includes a stator assembly, having M slots, with a stator core and stator teeth, that is further configured with stator windings to generate a stator magnetic field when excited with alternating currents and extends along a longitudinal axis with an inner surface that defines a cavity; and a rotor assembly, having N poles, disposed within the cavity which is configured to rotate about the longitudinal axis, wherein the rotor assembly includes a shaft, a rotor core located circumferentially around the shaft. The machine is configured such that a value k=M/(X*N) wherein k is a non-integer greater than about 1.3. The electric machine may alternatively, or additionally, include a non-uniformed gap between the exterior surface of the rotor spokes and the interior stator surface of the stator.

Abstract: A rotor element or a star disk which is designed to be arranged on an electrically excited rotor of an electric machine, includes a base which is designed to be arranged in an insert between the axial end of a laminate stack of the rotor and at least one end winding of the rotor. At least one fin is fastened on the base and is designed to protrude in the insert through the at least one end winding axially out of the at least one end winding.

Abstract: A drive unit includes a base member having an operation base having operation recesses in a front surface, a movable member that is disposed to be opposite to the base member and has operation projections to be inserted into the operation recesses in an opposed surface, and a shape memory alloy member that is disposed between the base member and the movable member and shrinks by heat generated by passing an electric current. In conjunction with the shrinkage of the shape memory alloy member by the passage of the electric current, the movable member is moved in a direction away from the base member. The base member has a fixed portion in its middle in a core axial direction of the shape memory alloy member, to fix the middle on a support member.

Abstract: A rotor for a permanent magnet synchronous machine that includes a rotor core structure. A first set of permanent magnets forms poles within the rotor core structure. Each pole includes a pair of permanent magnets from the first set of permanent magnets. A first set of apertures is formed in a first radial layer of the rotor core structure. Each pole includes a pair of apertures from the first set of apertures. The first set of permanent magnets is inserted within the first set of apertures. Each pair of permanent magnets within a pole cooperatively generates a magnetic field in a same direction within the pole. The magnetic field generated by a respective pair of magnets in a respective pole is opposite to a magnetic field generated by a pair of permanent magnets in an adjacent pole.

Abstract: A core for an electrical machine has a segmented body with first segments and second segments. The first segments extend from a radially inner portion of the segmented body to a radially outer portion of the segmented body. The second segments are axially stacked in alteration with the first layers along an axis of the segmented body. The first segments have thermal conductivity greater than thermal conductivity of the second segments for transferring heat from the radially outer portion of the segmented body to the radially inner portion of the segmented body.