Abstract: An apparatus for manufacturing a rotor includes a magnetizer. The magnetizer is configured to magnetize a permanent magnet in a rotor from outside the rotor. The rotor includes a rotor core having a magnet insertion hole. The permanent magnet is provided in an embedded state in the magnet insertion hole and has a bent-back shape protruding radially inward. The magnetizer includes a first yoke portion, a second yoke portion, and a magnetization coil. The first yoke portion has an opposing portion facing an outer peripheral surface of the rotor. The second yoke portion forms a magnetic path together with the first yoke portion. The magnetization coil is disposed on the magnetic path of the first and second yoke portions. The magnetizer magnetizes the permanent magnet by energizing the magnetization coil to apply a magnetizing magnetic flux at least through the rotor between the first yoke portion and the second yoke portion, which are located opposed to each other in a radial direction of the rotor.

Abstract: A rotor includes a rotor core, including a magnet accommodation cavity, and a permanent magnet, embedded in the magnet accommodation cavity of the rotor core and including a bent portion located toward a radially inner side of the rotor core. The permanent magnet has a thickness to satisfy an expression of 0 . 0 ? 0 ? 0 ? 6 ? D + 0 . 1 ? 6 ? 2 ? 6 - 0.5 / ( D / 2 ) ? Wm / ( D / 2 ) ? - 0 . 0 ? 0 ? 0 ? 6 ? D + 0 . 1 ? 6 ? 2 ? 6 + 0.5 / ( D / 2 ) .

Abstract: A manufacturing apparatus of a rotor is for a rotor having a permanent magnet provided in a state of being embedded inside a rotor core, the permanent magnet having a folding shape being convex towards a radially inside part. The manufacturing apparatus includes a magnetization apparatus that magnetizes the permanent magnet in the embedded state from outside the rotor. The magnetization apparatus is provided with a yoke part at least disposed in an axially outside part of the rotor, the yoke part constituting a magnetic path for supplying a magnetization flux to the permanent magnet. The yoke part includes at least one of a dust core, a laminated steel plate, and a slit having a function of suppressing eddy current occurring due to the magnetization flux.

Abstract: A rotor includes a rotor core, including a magnet accommodation cavity, and a permanent magnet, embedded in the magnet accommodation cavity of the rotor core and including a bent portion located toward a radially inner side of the rotor core. The permanent magnet has a thickness to satisfy an expression of 0.0006D+0.1626?0.5/(D/2)?Wm/(D/2)??0.0006D+0.1626+0.5/(D/2).

Abstract: A rotor includes a plurality of rotor units disposed side by side in an axial direction. The plurality of rotor units each include a rotor core, a plurality of permanent magnets, a plurality of magnetic pole sections and a plurality of magnetic pole bordering sections. At least one of the rotor units has a displacement portion in an outer circumferential surface of the rotor core. The displacement portion is displaced radially inward from respective magnetic pole centers of a circumferentially adjacent pair of the magnetic pole sections toward the magnetic pole bordering section between the pair of the magnetic pole sections. The displacement portion is disposed corresponding to at least one of the magnetic pole bordering sections. The magnetic pole centers of at least one of the rotor units are offset in the circumferential direction with respect to the magnetic pole centers of another of the rotor units.

Abstract: A rotor has a plurality of magnetic poles each including one of permanent magnets and one of outer core portions. Each of the outer core portions has a radially outer surface that has an arc shape such that the radially outer surface becomes closer to a rotation axis of the rotor as it extends from a magnetic-pole center of the magnetic pole toward both sides in a circumferential direction. A reference circle is defined which has a diameter equal to a maximum diameter of the rotor core and centers on the rotation axis. An outer circumferential surface of the rotor core has, at intersections between the arc-shaped radially outer surfaces of the outer core portions, maximum displacement portions that are most displaced from the reference circle radially inward. A displacement amount of the maximum displacement portions from the reference circle is smaller than a maximum thickness of the permanent magnets.

Abstract: A rotor includes: a rotor core including a plurality of core sheets that are laminated together and having a plurality of magnet-receiving holes formed in a folded shape; and a plurality of permanent magnets embedded respectively in the magnet-receiving holes. Each of the core sheets has a plurality of first through-holes and a plurality of second through-holes. Each of the first through-holes has a connection portion formed at an intermediate position in the folded shape of a corresponding one of the magnet-receiving holes to connect inner peripheral edges of the first through-hole that face each other in a width direction of the first through-hole. Each of the second through-holes has no connection portion. The core sheets are identical in configuration to each other. The core sheets are laminated so that each of the magnet-receiving holes is constituted of a mixture of the first and second through-holes of the core sheets.

Abstract: A rotor is configured such that end portions of permanent magnets protrude, as protruding portions, from axial end faces of a rotor core which are formed as flat surfaces, so as to minimize leakage of magnetic flux of embedded magnet portions of the permanent magnets from the axial end faces of the rotor core; the embedded magnet portions of the permanent magnets are located in the rotor core.

Abstract: A rotor includes a permanent magnet, which is inserted in a magnet receiving hole of a rotor core and is shaped in a form of a mountain fold that is convex toward a radially inner side. A manufacturing device for the rotor includes a magnetizing device that magnetizes the inserted permanent magnet from an outside of the rotor. The magnetizing device includes: a first magnetizing unit that is placed on one side of the rotor in an axial direction and includes a magnetizing coil which supplies a magnetizing magnetic flux to the permanent magnet; and a second magnetizing unit that is placed on another side of the rotor in the axial direction and includes a magnetizing coil which supplies a magnetizing magnetic flux to the permanent magnet.

Abstract: An apparatus for manufacturing a rotor includes a magnetizer. The magnetizer is configured to magnetize a permanent magnet in a rotor from outside the rotor. The rotor includes a rotor core having a magnet insertion hole. The permanent magnet is provided in an embedded state in the magnet insertion hole and has a bent-back shape protruding radially inward. The magnetizer includes a first yoke portion, a second yoke portion, and a magnetization coil. The first yoke portion has an opposing portion facing an outer peripheral surface of the rotor. The second yoke portion forms a magnetic path together with the first yoke portion. The magnetization coil is disposed on the magnetic path of the first and second yoke portions. The magnetizer magnetizes the permanent magnet by energizing the magnetization coil to apply a magnetizing magnetic flux at least through the rotor between the first yoke portion and the second yoke portion, which are located opposed to each other in a radial direction of the rotor.

Abstract: A rotor includes a rotor core, including a magnet accommodation cavity, and a permanent magnet, embedded in the magnet accommodation cavity of the rotor core and including a bent portion located toward a radially inner side of the rotor core. The permanent magnet has a thickness to satisfy an expression of 0.0006D+0.1626?0.5/(D/2)?Wm/(D/2)??0.0006D+0.1626+0.5/(D/2).

Abstract: A motor control device controls a two-phase motor. The two-phase motor obtains a combined torque, which serves as an output torque. The A-phase and B-phase motor portions being joined having a phase difference in terms of structure. The motor control device sets each of A-phase and B-phase drive currents supplied to the A-phase and B-phase motor portions to control the two-phase motor. The motor control device includes a fundamental wave setting unit that sets a sinusoidal fundamental wave current of the A-phase and B-phase drive currents, and a superimposing wave setting unit that sets a high-order harmonic current superimposed on the fundamental wave current. The superimposing wave setting unit sets the high-order harmonic current of at least one of “4n+1”th-order and “4n?1”th-order to reduce a component of “4n”th-order in torque pulsation of the combined torque, and “n” is a natural number.

Abstract: A rotor includes magnetic pole portions and first and second ferric core portions. The first and second ferric core portions are each located between magnetic pole portions in the circumferential direction of a rotor. A first gap is formed between the first or second ferric core portion and a magnetic pole portion at a first circumferential side. A second gap is formed between the first or second ferric core portion and the magnetic pole portion at a second circumferential side. The first gap has a smaller width than the second gap at the first ferric core portion. The first ferric core portion is inclined toward the first circumferential side. The first gap is larger than the second gap at the second ferric core portion. The second ferric core portion is inclined toward the second circumferential side.

Abstract: In a control apparatus, a magnetic flux information acquiring unit acquires magnetic flux information of magnetic poles of a rotating electric machine. A fundamental setting unit sets a fundamental command value for supplying a fundamental current to a winding of the rotating electric machine. A harmonic setting unit sets, based on the magnetic flux information acquired by the magnetic flux information acquiring unit, a harmonic command value for supplying a reduction current to the winding. The reduction current is a harmonic current for reducing variation in a radial electromagnetic force acting on a rotor of the rotating electric machine. An operating unit operates, based on the fundamental command value set by the fundamental setting unit and the harmonic command value set by the harmonic setting unit, an electric power converter to supply the winding with a drive current that is obtained by superimposing the reduction current on the fundamental current.

Abstract: A control device capable of suppressing electromagnetic force applied to a motor has a harmonic current calculation section and an operation section. The harmonic current calculation section calculates amplitude and phase of each of harmonic currents to be superimposed over a fundamental current which flows in phase windings of a stator of the motor based on conditions relating to load change of the motor. The operation section generates and transmits instruction signals to an inverter so that the calculated superimposed harmonic currents flow in the phase windings of the stator.

Abstract: In a control apparatus, a fundamental voltage generator generates, based on a target rotational speed, a fundamental voltage command for a fundamental voltage. A property storage stores a natural vibration property of a rotor when the rotor is rotating as a rotating vibration property. A rotating state detector detects a rotating position and a rotational speed of the rotor as a rotating state of the rotor. A harmonic voltage generator generates, based on the rotating state of the rotor and the rotating vibration property, a harmonic voltage command to be superimposed on the fundamental voltage command generated by the fundamental voltage generator.

Abstract: In a control apparatus, a magnetic flux information acquiring unit acquires magnetic flux information of magnetic poles of a rotating electric machine. A fundamental setting unit sets a fundamental command value for supplying a fundamental current to a winding of the rotating electric machine. A harmonic setting unit sets, based on the magnetic flux information acquired by the magnetic flux information acquiring unit, a harmonic command value for supplying a reduction current to the winding. The reduction current is a harmonic current for reducing variation in a radial electromagnetic force acting on a rotor of the rotating electric machine. An operating unit operates, based on the fundamental command value set by the fundamental setting unit and the harmonic command value set by the harmonic setting unit, an electric power converter to supply the winding with a drive current that is obtained by superimposing the reduction current on the fundamental current.

Abstract: In a control apparatus, a fundamental voltage generator generates, based on a target rotational speed, a fundamental voltage command for a fundamental voltage. A property storage stores a natural vibration property of a rotor when the rotor is rotating as a rotating vibration property. A rotating state detector detects a rotating position and a rotational speed of the rotor as a rotating state of the rotor. A harmonic voltage generator generates, based on the rotating state of the rotor and the rotating vibration property, a harmonic voltage command to be superimposed on the fundamental voltage command generated by the fundamental voltage generator.

Abstract: A control device capable of suppressing electromagnetic force applied to a motor has a harmonic current calculation section and an operation section. The harmonic current calculation section calculates amplitude and phase of each of harmonic currents to be superimposed over a fundamental current which flows in phase windings of a stator of the motor based on conditions relating to load change of the motor. The operation section generates and transmits instruction signals to an inverter so that the calculated superimposed harmonic currents flow in the phase windings of the stator.

Abstract: A control apparatus, for a system including a rotating machine having a stator, around which a winding wire is wound, and a power conversion circuit, includes: a superimposition device that superimposes multiple harmonic currents, for converting a first electromagnetic force to a second electromagnetic force, on a fundamental wave current, the first electromagnetic force being a second or higher order electromagnetic force as a reduction object, the second electromagnetic force being a second or higher order electromagnetic force and different from the first electromagnetic force, an order of each harmonic current being between the first electromagnetic force and the second electromagnetic force; and a manipulation device that operates the power conversion circuit to flow the fundamental wave current, on which the harmonic currents are superimposed, in the winding wire.