Abstract: A permanent magnet-type rotary electric machine includes a stator, a first rotor, and a second rotor. The stator includes a stator core, a plurality of stator teeth, a plurality of stator slots, a plurality of stator magnets, and a stator coil. The first rotor is disposed inside the stator core relative to the plurality of stator magnets. The second rotor is disposed inside the stator core relative to a plurality of first pole pieces. The second rotor includes a plurality of second pole pieces. A proportion of the number of the plurality of stator slots to the number of poles of the plurality of second pole pieces of the second rotor is greater than 1.25 and less than 1.5, or greater than 1.5 and less than 3.0.

Abstract: Provided is a magnetic strain wave gear device that makes it possible to achieve both improvement of the efficiency of assembly work and suppression of decrease in energy conversion efficiency. A magnetic strain wave gear device includes: a stator having a stator core, a stator winding, and a stator magnet; a first rotor; and a second rotor. The second rotor includes a second rotor core provided with a plurality of rotor magnet insertion holes and a plurality of rotor magnets inserted into the plurality of respective rotor magnet insertion holes. The first rotor includes a cylindrical first rotor core and a first rotor end plate. The first rotor end plate has a rotor magnet passage hole through which the rotor magnets can be inserted into the rotor insertion holes from outside in a direction of a rotation shaft.

Abstract: A magnetic geared motor (1) includes a stator (30) including a plurality of teeth (31) that produce a magnetomotive force, a first rotor (10) that rotates by the magnetomotive force of the stator (30), and a second rotor (20) that, in response to rotation of the first rotor (10), rotates at a lower speed than the first rotor (10). The first rotor (10), the second rotor (20), and the stator (30) are disposed coaxial to each other, and a plurality of magnets (34) of different polarities are disposed in respective slot openings (31c) present between each two adjacent teeth (31).

Abstract: A magnetic geared motor includes a stator, a first inner rotor that is disposed to an inner side of the stator and rotates by a magnetomotive force of the stator, a first center rotor disposed between the stator and the first inner rotor, a second center rotor disposed to an inner side of the first inner rotor, and a second inner rotor disposed to an inner side of the second center rotor. The stator, the first center rotor, the first inner rotor, the second center rotor, and the second inner rotor are disposed coaxial to each other, and the first inner rotor includes first outer magnetic pole pairs disposed in a circumferential direction and a plurality of first inner magnetic pole pairs disposed in the circumferential direction.

Abstract: A rotary electric machine includes a rotor that rotates around a rotation axis serving as a center and has a plurality of salient poles protruding in directions perpendicular to the rotation axis, and a stator that includes an annular structural body disposed radially outside the rotor and surrounding the rotor, and 6×n windings provided along a circumferential direction of the structural body, a field signal for generating field magnetic flux and a drive signal for driving the rotor as a three-phase rotary electric machine being superimposed on each other to be input to each of the windings. n is a natural number equal to or larger than one.

Abstract: A rotary electric machine includes: a first rotor, a stator, and a second rotor that are coaxially disposed in stated order from radially centermost to radially outermost and spaced apart from one another, the stator including a plurality of pole pieces and a plurality of windings in a circumferential direction. The first rotor and the second rotor each include permanent magnets or electromagnets, the plurality of windings generate electromagnetic torque in the first rotor and the second rotor, the electromagnetic torque is magnetically transferred to the second rotor by rotation of the first rotor, or magnetically transferred to the first rotor by rotation of the second rotor, and in one of the first rotor and the second rotor, torque that is magnetically transferred from an other of the first rotor and the second rotor is superimposed on the electromagnetic torque.

Abstract: A magnetic wave gear device (1A, 1B, 1F) includes: a first member (10), a second member (20), and a third member (30) which are rotatable relative to one another around a rotation axis (R). The second member (20) is disposed between the first member (10) and the third member (30), and includes magnetic material pieces (21). The first member (10) includes first permanent magnets (12A, 12B). The third member (30) includes: a plurality of pole teeth (32), a pole tooth (32) being wound with a coil (33); and second permanent magnets (34B), each second permanent magnet (34B) being disposed between pole teeth (32) next to each other, and the magnetic poles of sides of the second permnanent magnets (34B) facing the second member (20) being the same pole.

Abstract: A rotary electric machine includes a rotor that rotates around a rotation axis serving as a center and has a plurality of salient poles protruding in directions perpendicular to the rotation axis, and a stator that includes an annular structural body disposed radially outside the rotor and surrounding the rotor, and 6×n windings provided along a circumferential direction of the structural body, a field signal for generating field magnetic flux and a drive signal for driving the rotor as a three-phase rotary electric machine being superimposed on each other to be input to each of the windings. n is a natural number equal to or larger than one.

Abstract: A magnetic wave gear device (1A, 1B, 1F) includes: a first member (10), a second member (20), and a third member (30) which are rotatable relative to one another around a rotation axis (R). The second member (20) is disposed between the first member (10) and the third member (30), and includes magnetic material pieces (21). The first member (10) includes first permanent magnets (12A, 12B). The third member (30) includes: a plurality of pole teeth (32), a pole tooth (32) being wound with a coil (33); and second permanent magnets (34B), each second permanent magnet (34B) being disposed between pole teeth (32) next to each other, and the magnetic poles of sides of the second permnanent magnets (34B) facing the second member (20) being the same pole.

Abstract: The invention provides a motor including: a cylindrical motor case having a bottom that supports an outer circumferential surface of a stator core by an inner circumferential surface thereof; and a bracket that supports an output shaft side bearing and closes an opening of the motor case; wherein the stator core is press-fitted into the motor case from the opening such that a part of the stator core is exposed from the motor case, and a part of the stator core that is not press-fitted to the motor case forms a sliding fitting wall capable of providing a sliding fitting connection with the bracket.

Abstract: A command current setting portion has a target value corrector that calculates d-axis and q-axis current command values idc, iqc that are to be supplied to an open-loop controller, based on d-axis and q-axis current target values id*, iq*. When d-axis and q-axis voltage target value vd*, vq* calculated from the d-axis and q-axis current target values id*, iq* by the motor circuit equations exceed a voltage limit, this target value corrector 26 corrects the d-axis and q-axis current target values id*, iq* by the field weakening control such that d-axis and q-axis voltages vd, vq and d-axis and q-axis currents id, iq satisfy ?(vd2+vq2)?Vlim and ?(id2+iq2)?Ilim respectively. The d-axis and q-axis current command values idc, iqc are obtained by this correction.

Abstract: A permanent magnet included in a rotor of a brush-less motor is a radial anisotropic magnet in which multi-poles are magnetized in the circumferential direction and is skew magnetized along the axial direction in such a manner that a surface to one end part of an upper side from a central part in the axial direction and a surface to an end part of a lower side from the central part are axially shifted by a predetermined angle in the circumferential direction from each other. In accordance with this skew-magnetization, coggings including irregularly varying components generated in the rotor owing to the three-dimensional shapes of coil ends provided at opposite ends of a tooth 611a for fixing a winding have opposite phases to each other, so that the coggings are cancelled with each other. Accordingly, the coggings can be reduced or cancelled.

Abstract: A command current setting portion has a target value corrector that calculates d-axis and q-axis current command values idc, iqc that are to be supplied to an open-loop controller, based on d-axis and q-axis current target values id*, iq*. When d-axis and q-axis voltage target value vd*, vq* calculated from the d-axis and q-axis current target values id*, iq* by the motor circuit equations exceed a voltage limit, this target value corrector 26 corrects the d-axis and q-axis current target values id*, iq* by the field weakening control such that d-axis and q-axis voltages vd, vq and d-axis and q-axis currents id, iq satisfy ?(vd2+vq2)?Vlim and ?(id2+iq2)?Ilim respectively. The d-axis and q-axis current command values idc, iqc are obtained by this correction.

Abstract: A brushless motor includes a stator and a rotor. The stator includes an annular stator core having teeth arranged with a spacing in a circumferential direction of the annular stator core; and coils wound around the teeth respectively. The rotor includes a rotor core and magnetic poles of segment magnets arranged annularly along a circumferential direction of the rotor core. The segment magnets are stacked at a plurality of stages in an axial direction of the rotor core. A length direction of each of the segment magnets is parallel with the axial direction of the rotor core. The following expression is satisfied: (2×?/P)+?<(360/P) where P is the number of the magnetic poles of the segment magnets at each stage, ? (electrical angle) is the effective pole angular aperture on the outer peripheral surface of the rotor core, and ? is the skew angle equivalent to a phase shift angle between the corresponding magnetic poles of the segment magnets at the adjacent stages.

Abstract: A brushless motor including a rotor which has ten permanent magnets each containing rare earth neodymium and provided around a rotor yoke and an outside diameter of 45 mm to 55 mm, and a stator which has a stator core having twelve slots and an outside diameter of 75 mm to 85 mm and whose magnetomotive force at maximum current is 700 AT or more. The stator core is configured such that a teeth width b is 0.14 times or more of the outside diameter of the rotor.

Abstract: A brushless motor includes an annular stator and a rotor which has a plurality of permanent magnets alternately arranged in circumferential direction on the rotor to form poles and which is disposed within the stator to be rotatable with respect to the stator. The stator includes a cylindrical yoke and a plurality of teeth which are same in size one another, are connected to the yoke to extend therefrom toward the rotor, and are disposed at even interval in the circumferential direction. Width of each of the teeth in the circumferential direction is set to be greater than or at a vicinity of the value which is obtained by dividing outer diameter of the rotor by the number of the teeth and multiplying the result of dividing by ?/2.

Abstract: A brushless motor includes a stator and a rotor. The stator includes an annular stator core having teeth arranged with a spacing in a circumferential direction of the annular stator core; and coils wound around the teeth respectively. The rotor includes a rotor core and magnetic poles of segment magnets arranged annularly along a circumferential direction of the rotor core. The segment magnets are stacked at a plurality of stages in an axial direction of the rotor core. A length direction of each of the segment magnets is parallel with the axial direction of the rotor core. The following expression is satisfied: (2×?/P)+?<(360/P) where P is the number of the magnetic poles of the segment magnets at each stage, ? (electrical angle) is the effective pole angular aperture on the outer peripheral surface of the rotor core, and ? is the skew angle equivalent to a phase shift angle between the corresponding magnetic poles of the segment magnets at the adjacent stages.

Abstract: An electric motor provided in a vehicle steering apparatus includes a stator coaxially surrounding a steering shaft, an inner rotor disposed on the inner periphery of the stator, and an outer rotor disposed on the outer periphery of the stator. The facing area between the stator and the rotor can be increased by providing the inner rotor and the outer rotor in the electric motor. Consequently, the electric motor can be miniaturized while a certain output thereof is maintained. The vehicle steering apparatus can be miniaturized by miniaturizing the electric motor.

Abstract: A permanent magnet included in a rotor of a brush-less motor is a radial anisotropic magnet in which multi-poles are magnetized in the circumferential direction and is skew magnetized along the axial direction in such a manner that a surface to one end part of an upper side from a central part in the axial direction and a surface to an end part of a lower side from the central part are axially shifted by a predetermined angle in the circumferential direction from each other. In accordance with this skew-magnetization, coggings including irregularly varying components generated in the rotor owing to the three-dimensional shapes of coil ends provided at opposite ends of a tooth 611a for fixing a winding have opposite phases to each other, so that the coggings are cancelled with each other. Accordingly, the coggings can be reduced or cancelled.

Abstract: In a three-phase brushless motor, a rotor has a stacked structure including first to third stages which include segment magnets to which a skew process is applied. When the number of poles P in the circumferential direction is set to P, an angle of skew is set to ?=360/(6P/2) [deg]. That is, the magnet segments are respectively arranged so that the magnet segment of the second stage is shifted by a rotating angle of ?/3 in the circumferential direction from the magnet segment of the first stage and the magnet segment of the third stage is shifted by a rotating angle of 2?/3 in the circumferential direction.