Abstract: A resolver includes a rotor attached to a shaft of a rotating body, a stator, an excitation circuit, and an angle computation unit configured to compute a rotation angle of the rotor. Each tooth of the stator has line-symmetry with respect to a line connecting a center of a core back of the stator and centers of the teeth in a circumferential direction as viewed from an axial direction. A rotor outline is expressed by a function Rr(x(?), y(?)) defined by Equations (1) to (3), where an x and a y axes are axes of an orthogonal coordinate system having a center of the shaft as an origin, and an angle from a reference axis is ?, where a minimum distance from the center of the core back to the teeth is Ri, and a maximum distance is Ro, and a number of salient poles of the rotor is Nx.

Abstract: A rotating electrical machine includes a stator and a rotor, the rotor includes a rotor core and a plurality of magnetic poles, the plurality of magnetic poles includes a plurality of magnet poles formed by permanent magnets, and a plurality of dummy poles, the magnet poles and the dummy poles are alternately disposed in both an axial direction and a circumferential direction, non-magnetic holes are provided between the magnet poles and the dummy poles that are adjacent in the axial direction, and when a length of each magnet pole in the axial direction is tm, a length of each dummy pole in the axial direction is tc, a length of each non-magnetic hole in the axial direction is ta, and a length of the rotor core in the axial direction is lc, the rotating electrical machine satisfies tm>tc and lc<(2×tm)+ta.

Abstract: A rotating electric machine includes a stator and a rotor. The rotor includes a rotor core, an axial end part, and a rotor magnet inserted into an insertion hole formed so as to pass through the rotor core. The axial end part has a recessed portion. The rotor magnet includes a first side surface and a second side surface. The first side surface is fixed to a first inner wall surface of the insertion hole. In a cross section perpendicular to the axial direction, a width of the first inner wall surface is larger than a width of the first side surface. The second side surface is fixed to a second inner wall surface of the recessed portion. In the cross section perpendicular to the axial direction, a width of the second inner wall surface is larger than a width of the second side surface.

Abstract: A control device that can prevent the deterioration of temperature estimation accuracy in a rotating electric machine due to its aging deterioration is provided. The control device (10) includes a correction unit (13) to correct at least one of thermal resistance, heat generation, and thermal capacity, which are physical quantities to build a thermal circuit model (30-1) covering a thermal circuit of a rotating electric machine (1), wherein the correction unit (13) corrects at least one of the thermal resistance, the heat generation, and the thermal capacity at a measurement position by using measurement information including temperature (T31) or thermal flow (U32) measured by a sensing unit (8) at the measurement position in the rotating electric machine (1).

Abstract: This motor device includes: a motor having components including a stator and a rotor; and a controlling circuitry to control the motor. The motor is provided with temperature sensors to detect a heat transfer amount and a transfer direction about the components. The controlling circuitry includes a temperature calculator to calculate a component temperature based on a thermal circuit network from thermal resistances and heat capacities given for the components. On the basis of actual measured values of the heat transfer amount and the transfer direction obtained by the temperature sensors, the temperature calculator corrects thermal resistances and heat capacities about the components obtained on the basis of the thermal circuit network, and estimates the temperature of each component during driving of the motor.

Abstract: In an electric rotating machine according to this application, a maximum height of a permanent magnet in a rotor and a flange-part root radial thickness of the tooth portion in the stator can be set properly, so that it is possible to eliminate unbalanced magnetic saturation at flange parts of the heads of the tooth portions. This makes it possible to reduce an unbalance between torque ripples that are generated respectively by an upper-side rotor block and a lower-side rotor block when an electric power steering apparatus is driven under static steering conditions, to thereby achieve an electric rotating machine with a suppressed torque ripple. With the use of this electric rotating machine, since the torque-ripple unbalance is reduced, it is possible to achieve an electric power steering apparatus with a suppressed torque ripple.

Abstract: Provided is a rotor for a rotating electric machine, which enables suppression of a reduction in output of a rotating electric machine. The rotor for a rotating electric machine includes: a rotor core having winding-portion insertion holes and magnet insertion holes; rotor winding portions inserted into the winding-portion insertion holes; and rotor permanent magnets inserted into the magnet insertion holes, wherein each of the rotor winding portions includes: a non-magnet portion; and a rotor winding provided to the non-magnet portion, wherein each of the non-magnet portions is fixed to the rotor core, and wherein the rotor windings are fixed to the rotor core through intermediation of the non-magnet portions.

Abstract: A rotating electric machine includes a stator and a rotor. The rotor includes a rotor core and a plurality of permanent magnets. The rotor core includes a plurality of core portions. The rotor core includes an annular portion and a plurality of coupling portions. Each of the plurality of coupling portions couples the annular portion and a first core portion of each of the plurality of core portions to each other. Each of the plurality of coupling portions has at least one coupling path. A sum of a width of a portion having the smallest width in at least one coupling path is smaller than a length of a joining boundary between the annular portion and each of the plurality of coupling portions.

Abstract: A resolver body including a rotor having Nx (Nx is a natural number) salient poles, a stator facing the rotor and having Ns (Ns is an integer equal to or larger than 3) teeth arranged in a circumferential direction, and an excitation winding and two phases of output windings wound on each tooth; and an excitation circuit configured to apply voltage to the excitation winding. The excitation winding and the two phases of output windings wound on each of Nsm (Nsm is an integer equal to or larger than 2) teeth among the Ns teeth are set to be of a main system. The excitation winding and the two phases of output windings wound on each of Ns-Nsm teeth are set to be of a sub-system. The number Nsm of the teeth corresponding to the main system is larger than the number Ns-Nsm of the teeth corresponding to the sub-system.

Abstract: To solve a problem that the accuracy of angle detection deteriorates owing to noise voltage generated by eccentricity or variation in shape among rotors according to the number of magnetic poles of a rotor core of a multiple-system rotation sensor, the number S of magnetic poles of a stator core is, with the number R of the magnetic poles of the rotor core and the number N (N is a natural number equal to or larger than 2) of systems for stator windings, in a relationship of S=nRN (n is a natural number), system windings of each system are wound so as to be divided for every R magnetic poles among the S magnetic poles of the stator core, and a winding arrangement of the system windings of each system is made so as to achieve R-times rotational symmetry about a rotor rotation axis.

Abstract: A rotating electric machine includes a stator and a rotor. The rotor includes a rotor core, an axial end part, and a rotor magnet inserted into an insertion hole formed so as to pass through the rotor core. The axial end part has a recessed portion. The rotor magnet includes a first side surface and a second side surface. The first side surface is fixed to a first inner wall surface of the insertion hole. In a cross section perpendicular to the axial direction, a width of the first inner wall surface is larger than a width of the first side surface. The second side surface is fixed to a second inner wall surface of the recessed portion. In the cross section perpendicular to the axial direction, a width of the second inner wall surface is larger than a width of the second side surface.

Abstract: This motor device includes: a motor having components including a stator and a rotor; and a controlling circuitry to control the motor. The motor is provided with temperature sensors to detect a heat transfer amount and a transfer direction about the components. The controlling circuitry includes a temperature calculator to calculate a component temperature based on a thermal circuit network from thermal resistances and heat capacities given for the components. On the basis of actual measured values of the heat transfer amount and the transfer direction obtained by the temperature sensors, the temperature calculator corrects thermal resistances and heat capacities about the components obtained on the basis of the thermal circuit network, and estimates the temperature of each component during driving of the motor.

Abstract: A control device that can prevent the deterioration of temperature estimation accuracy in a rotating electric machine due to its aging deterioration is provided. The control device (10) includes a correction unit (13) to correct at least one of thermal resistance, heat generation, and thermal capacity, which are physical quantities to build a thermal circuit model (30-1) covering a thermal circuit of a rotating electric machine (1), wherein the correction unit (13) corrects at least one of the thermal resistance, the heat generation, and the thermal capacity at a measurement position by using measurement information including temperature (T31) or thermal flow (U32) measured by a sensing unit (8) at the measurement position in the rotating electric machine (1).

Abstract: Provided is a rotor for a rotating electric machine, which enables suppression of a reduction in output of a rotating electric machine. The rotor for a rotating electric machine includes: a rotor core having winding-portion insertion holes and magnet insertion holes; rotor winding portions inserted into the winding-portion insertion holes; and rotor permanent magnets inserted into the magnet insertion holes, wherein each of the rotor winding portions includes: a non-magnet portion; and a rotor winding provided to the non-magnet portion, wherein each of the non-magnet portions is fixed to the rotor core, and wherein the rotor windings are fixed to the rotor core through intermediation of the non-magnet portions.