Abstract: A temperature estimation apparatus for a rotating electric machine includes a coolant dissipator, a heat dissipation amount calculator, a coolant temperature calculator, and a temperature calculator. The coolant dissipator is to cool down a coolant by heat exchange with a cooling air outside a rotating electric machine. The heat dissipation amount calculator is to calculate heat dissipation amount of the coolant in the coolant dissipator based on a physical quantity correlating with air speed of the cooling air and a physical quantity correlating with flow rate of the coolant. The coolant temperature calculator is to calculate, based on the heat dissipation amount, temperature of the coolant that has passed through the coolant dissipator. The temperature calculator is to calculate, based on the temperature of the coolant, temperature of the rotating electric machine which the coolant cool down.

Abstract: An armature winding is configured by mounting into an armature core a plurality of distributed-winding coils that are each produced by bending and shaping a conductor wire that is coated with insulation, coil ends are configured by arranging coil end portion rows that are formed by arranging coil end portions of the coils in a single row circumferentially in n layers in a radial direction, where n is an integer that is greater than or equal to 1, and an interphase insulating material includes: a strip-shaped insulating sheet material that is inserted inside the coil end portions, and that is disposed so as to extend circumferentially between the coil end portion rows; and an insulating buffering material that is formed on one surface of the insulating sheet material, and that is fixed to the coil end portion rows by forming air bubble groups internally.

Abstract: An electrostatic induction-type vibration power generation device and method for improving a power generation amount, and extracting an external electric field from a spontaneous polarization electret. A pair of conductive plates is disposed with a gap therebetween. A charged body formed of a spontaneous polarization electret having predetermined thickness has a positively charged lower surface and negatively charged upper surface. The charged body is between conductive plates in contact with one conductive plate. The gap between the conductive plates is displaced in a direction vertical to the surfaces of the spontaneous polarization electret, whereby an electrostatic capacitance changes and electric power is generated. The other conductive plate is disposed at a position where an absolute value of an external electric field emitted outside from the charged body is between 2.7×107 V/m and 1.5×1010 V/m. Moreover, the thickness of the spontaneous polarization electret is between 1 mm and 60 mm.

Abstract: A preformed coil (20) to produce a self-supporting air-gap skewed winding of a small electric motor consisting of at least two preformed coils (20) positioned overlapping on a circumference of a winding (6) and a method and device for producing the coil. Two preformed coil sides (24a, 24b) lying in different radial planes are formed which are connected on their front ends (26a, 26b) by front connections. The front connections feature the radial plane offset from the winding offset sections (28) bridging the preformed coil sides (24a, 24b). The preformed coil sides (24a, 24b) are formed curved with a circular shape around a longitudinal axis (16), and the radius of curvature of the one radial outer preformed coil side (24a) is greater than the radius of curvature of the radial inner preformed coil side (24b).

Abstract: In one aspect of the present invention, a stator of a linear compressor comprises first stator pieces that are circumferentially and sequentially arranged about an axial direction and are radially disposed, second stator pieces that are provided between outer parts of the adjacent first stator pieces, and an outer side, away from a motor axis, of the second stator pieces assembled at an outer circumference of the stator. The stator can reduce the magnetic losses of the stator caused by the gap, and improve the efficiency of the motor. It can also improve the performance, stability, durability and reliability of the linear compressor. It can also reduce the bulk of the linear compressor.

Abstract: An electrostatic rotating electrical machine employs interdigitated axial pegs on opposed rotor and stator plates, the pegs immersed in a high dielectric constant fluid. Peg shape, length and positioning may be varied to tailor a changing aspect profile to a desired power source.

Abstract: A torque arm structure includes a first member which is fixed to the reduction gear or a member integrated with the reduction gear, and a second member which is fixed to an outer member to oppose the first member, and an elastic member configured to transmit a load by which the reduction gear is rotated around the output shaft from the first member to the second member. The elastic member is to be fitted into a gap between the first member and the second member and is detachably disposed in the gap.

Abstract: A device for producing electricity. The device comprises an indium gallium phosphide semiconductor material comprising a plurality of indium gallium phosphide material layers each layer having different dopant concentrations and doped with either n-type dopants or p-type dopants, a first terminal on a first surface of the semiconductor material, a beta particle source proximate the first surface for emitting beta particles that penetrate into the semiconductor material, and a second terminal on a second surface of the semiconductor material; the semiconductor material for producing current between the first and second terminals responsive to the beta particles penetrating into the semiconductor material.

Abstract: A remotely adjustable orifice plate arrangement for a generator is provided. The arrangement includes an enclosed generator with an interior wall including an orifice through which a fluid flows. The arrangement also includes a first plate including an orifice and a remotely controllable motor. The first plate is coupled to the interior wall within a flow area of the generator such that at least a portion of the orifice overlaps the orifice of the interior wall. The arrangement also includes an adjustable orifice plate including an orifice wherein the adjustable orifice plate slides relative to the first plate to determine the size of a resultant orifice of the interior wall. The motor selectively controls the slideable movement of the adjustable orifice plate relative to the first plate and is controlled remotely from outside the enclosed generator. A method to remotely adjust fluid flow within an enclosed generator is also provided.

Abstract: An electric motor includes a rotor and a wound stator structure. The stator structure includes a housing, a laminated stator core and windings wound around the stator core. The laminations of the stator core have an annular body and a plurality of teeth extending radially inwardly from the annular body. Projections and recesses are formed at the outer edge of the annular body. When assembled, the recesses of one lamination are aligned with the projections of an adjacent lamination such that when fitting the stator into the housing the projections may be deformed into an axially adjacent recess by contact with the housing. Thus the stator core contacts the housing at discrete locations.

Abstract: A stator core with a plurality of slots circumferentially arranged therearound has a stator winding including three (UVW) phase windings, each phase winding having 4n parallel windings. The stator winding is formed of U-shaped conductor segments inserted in the slots from one axial end, a pair of open end portions of each conductor segment extending axially from of the stator core and being bent toward circumferentially opposite directions, the bent portions being star connected together. The plurality of slots have, for each phase winding, pairs of circumferentially adjacent slots, each slot having an even number of slot-received portions of the phase winding radially aligned in a column, and for each circumferential slot pairs, the slot-received portion in an m-th layer of each slot of the pair is electrically connected to the portion inserted in an (m+1)-th layer of a slot of a circumferentially adjacent slot.

Abstract: A motor of a ceiling fan includes a shaft, a bearing sleeve, a limiting member, a stator and a rotor. The shaft has a first shoulder and a second shoulder. The bearing sleeve receives a first bearing and a second bearing for supporting the shaft and has an inner flange, with the inner flange and the first shoulder jointly clamping and positioning the first bearing. The limiting member and the second shoulder jointly clamp and position the second bearing. The stator is arranged around the shaft. The rotor couples with the bearing sleeve.

Abstract: An extended duration burst electrical energy harvesting generator in one embodiment including two magnets situated on opposite ends of an angular movable lever with a centered fulcrum support in an angular displacement (see-saw) arrangement. The two magnets are under the bi-stable magnetic attractive influence of dual magnetic metal (high permeability) substrates that are disposed at a distance within two separate center core electric coil bobbin forms that are situated under the opposite ends of the lever. Either one of the magnets, in time, will make or break contact with one of the substrates producing an instantaneous induced voltage at each of the coil terminals. The two induced voltages can be utilized to power battery-less and wireless remote communications control function such as ISM Band wireless transmitters and battery-less electronic device applications.

Abstract: A motor includes a stationary unit and a rotary unit. The stationary unit includes a stator, a base portion having at least one hole extending in the up-down direction, and a flexible wiring substrate. The flexible wiring substrate reaches a position higher than a lower surface of the base portion through at least one hole and is arranged to supply electric power to the stator. The flexible wiring substrate includes a connection portion arranged higher than the lower surface of the base portion and connected to the stator. The connection portion includes a solder portion arranged on a lower surface thereof to cover a portion of a lead wire extending from a coil of the stator. At least a portion of the solder portion is positioned within the hole.

Abstract: A power tool is provided including a housing and an electric motor disposed within the housing, where the electric motor includes a stator and an armature rotatably received within the stator, and the armature includes an armature shaft on which a commutator is mounted. The power tool includes a brush assembly disposed around the commutator. The brush assembly includes at least two brushes in contact with the commutator and a circuit board mounted on the brush assembly and in electrical contact with the brushes. The circuit board includes at least one electromagnetic interference (EMI) suppression component electrically mounted thereon, the EMI suppression component being electrically coupled to the brushes.

Abstract: In the electric machine according to the present invention, conductor wires are housed inside slots so as to be arranged into multiple layers in one column so as to contact each other in a slot depth direction in each column such that a longitudinal direction of a long side of an oblong cross section of a conductor portion faces in the slot depth direction, and a thickness of a portion of an insulating coating that is formed on a surface of the conductor portion that faces in the slot depth direction is thinner than a thickness of a portion of the insulating coating that is formed on a surface of the conductor portion that faces in a direction of slot arrangement.

Abstract: A rotor is and a motor including the rotor and a stator are provided. The rotor includes a rotor core and rotor poles. The rotor poles are arranged circumferentially around the rotor core, and each of the rotor poles is formed in an asymmetric shape. The stator is spaced apart from the rotor and includes slots which are configured so that a coil may be wound around the slots.

Abstract: In a bus bar unit in which a plurality of bus bars are formed by insert molding and arranged in an axial direction of a stator, each bus bar includes: a main body portion extending in a circumferential direction of the stator; a through hole formed in the main body portion, into which a support pin for supporting the main body portion of another bus bar is inserted in the axial direction of the stator during insert molding; and a projecting portion provided on a side portion of the main body portion in alignment with the through hole so as to increase a sectional area of the main body portion.

Abstract: A rotating electrical machine is provided with: a plurality of bus bars that provide an electrical relay between an external power line, which is positioned on the outside of a housing, and a multiphase coil; an insulation cover that is mounted on the plurality of bus bars with a prescribed gap between each, and covers at least part of the bottom surface of each bus bar; and a coolant supply means that supplies a cooling fluid, which cools a stator, inside the housing. A through-hole, which vertically penetrates a bottom surface, is formed on the bottom surface of the insulation cover.

Abstract: An actuator for moving a platform having electrical connections is provided. The actuator includes an outer frame connected to an inner frame by one or more spring elements that are electrically conductive. The actuator further includes one or more comb drive actuators that apply a controlled force between the outer frame and the inner frame. Each of the comb drive actuators includes one or more comb drives. Moreover, a method for moving a platform having electrical connections is also provided. The method includes connecting an outer frame to an inner frame using one or more spring elements that are electrically conductive. The method further includes generating a controlled force using one or more comb drive actuators. Each of the comb drive actuators includes one or more comb drives. In addition, the method includes applying the controlled force between the outer frame and the inner frame.