Pairs of unidirectionally magnetic rotor/stator assemblies are mounted for synchronous rotation and complementary, so that one creates pulsating positive current flow and the other creates pulsating negative current flow, as the rotor and stator in each assembly are rotated with respect to each other. The pulsating positive current flow and pulsating negative current flow are combined at a desired phase angle to create alternating current, without power loss due to reversal of current flow.

An axial split-phase bearingless flywheel motor includes a stator, a stator sleeve, a rotor, a rotor sleeve, and a flywheel. The stator and the rotor are axially divided into phases A, B and C. An axially magnetized permanent magnet is provided between every adjacent phases. Twelve rotor poles are provided at equal intervals on an inner side of the rotor core in each of the phases A, B, and C. The rotor poles in the phases A, B and C are staggered in sequence along a circumference by of a rotor pole pitch. Eight torque poles in a shape of narrow teeth and four suspension poles in a shape of wide teeth are provided on the stator core in both the phases A and C, and twelve torque poles of a uniform width are provided on the stator core in the phase B.

A rotor assembly is presented for a turbine engine with gas bearings including a solid permanent magnet with no central bore. The rotor assembly also includes a first shaft having at least one bearing intended for engaging with a support bearing to form a gas bearing and ensure rotational guidance of the first shaft as well as a thrust disk. The solid permanent magnet is press-fitted inside a band made of a nonmagnetic material, the band is integral with the first shaft in an extension thereof, and a second shaft has at least one bearing intended for engaging with a support bearing to form a second gas bearing and ensure rotational guidance of the second shaft, coaxially with the first shaft such that the first shaft, the band, and the second shaft form an integral assembly.

A step actuator includes a housing, a stator in the housing, a rotor including a magnet provided radially inward of the stator and a nut member inserted into the magnet and protruding through one side of the housing, a bearing rotatably supporting the nut member, a screw member coupled with the nut member to linearly move as the rotor rotates, and a mounting member supported on one side of the housing to support the screw member in such a manner that the screw member is linearly movable. The nut member includes an end portion passing through the bearing and a coupling portion extending from the end portion to couple with the bearing.

The present invention discloses a motor comprising: a stator part; and a rotor assembly rotatably disposed with respect to the stator part, wherein the rotor assembly comprises: a ring magnet including an insertion hole with a shaft disposed therein and a plurality of first grooves formed at one side thereof along a first imaginary circle; and a core member including a body portion disposed between the shaft and the insertion hole, and an extension portion covering the plurality of first grooves, wherein the extension portion comprises a plurality of second grooves deviated from a plurality of first imaginary straight lines which pass from a center of the first imaginary circle respectively through the plurality of first grooves.

An electrical machine includes a stator with a stator body supporting an electrical stator and a rotor. The rotor is supported by a bearing having a radial bearing section forming a radial gas bearing and an axial bearing section forming an axial gas bearing, the stator side parts of these bearing sections being a stator side radial bearing part and a stator side axial bearing part that are rigidly connected to one another and together form a stator bearing structure. The stator bearing structure is mounted to the other parts of the stator by either the stator side radial or axial bearing part being rigidly mounted to these other parts, and the other bearing part are connected to these other parts by an elastic support or not at all.

A rotor assembly is provided for an electric motor. The rotor assembly includes: a cylindrical magnet member having magnetization in both axial and radial directions, the magnet member being formed from a moldable magnetic material; and an output shaft receivable within the magnet member. An inner surface of the magnet member and an outer surface of the output shaft have complementarily-engagable interface elements thereon to prevent or limit dislocation of the magnet member and output shaft, and at least one of the interface elements is formed by overmolding of the magnet member and output shaft with the other of magnet member and output shaft.

A step actuator includes a housing, a stator in the housing, a rotor including a magnet provided radially inward of the stator and a nut member inserted into the magnet and protruding through one side of the housing, a bearing rotatably supporting the nut member, a screw member coupled with the nut member to linearly move as the rotor rotates, and a mounting member supported on one side of the housing to support the screw member in such a manner that the screw member is linearly movable. The nut member includes an end portion passing through the bearing and a coupling portion extending from the end portion to couple with the bearing.

A permanent-magnet electric motor includes: a rotor; and a rotational-position detection sensor configured to detect a rotational position of the rotor. The rotor includes: a rotating shaft; an annular ferrite magnet disposed on an outer circumferential surface of the rotating shaft; and a rare-earth magnet disposed on an outer circumferential surface of the ferrite magnet, and a length from a center of the ferrite magnet in an axial direction of the ferrite magnet to an end face of the ferrite magnet on a side of the rotational-position detection sensor in the axial direction of the ferrite magnet is longer than a length from a center of the rare-earth magnet in an axial direction of the rare-earth magnet to an end face of the rare-earth magnet on a side of the rotational-position detection sensor in the axial direction of the rare-earth magnet.

Provided is a rotor that is long in the axial direction of the rotary shaft without increasing the ratio L/D between the length L and the inner diameter D of the permanent magnet. The permanent magnet of the rotor includes a plurality of sub-magnets that are divided in the axial direction A of the rotary shaft. The armor ring includes a plurality of sub-rings that are divided in the axial direction A. The connector is disposed on the inner periphery of a connecting part between the two sub-rings and that are adjacent in the axial direction A and is disposed between the two sub-magnets that are adjacent in the axial direction A. The sub-magnets each have a recess that is depressed in the axial direction A. The connector has protrusions that fit to the recesses of the magnet.