A method for producing an electric motor includes: connecting a first phase coil of three-phase coils to a positive side of a source of electrical power for magnetizing; passing an electric current through the three-phase coils in a state where a center of a magnetic pole of a rotor is rotated a first angle with respect to a center of a magnetic pole of the first phase coil; switching a connection with the positive side of the source of electrical power from the first phase coil to a second phase coil; and passing an electric current through the three-phase coils in a state where the center of the magnetic pole of the rotor is rotated a second angle with respect to a center of a magnetic pole of the second phase coil.

The invention is a flywheel rotor that includes a number of adjacent laminations, stacked one on top of another, where each of the laminations has the same shape and is rotationally symmetric around a center axis, and where the shape is substantially circular and includes a plurality of protrusions on the circumference, and each of the laminations includes at least one hole for at fastening bolts to pass through. The invention typically includes an endplate at each end of stack of laminations and one of the two endplates attaches to a stubshaft.

A method and system for handling a rotor and a stator of a rotary machine employs a frame and a carriage. The carriage rides on and is guided by a parallel pair of tracks that extend away from the frame. The frame and tracks both rest on a horizontal surface. The stator can be placed on the carriage and the frame can be used to provide support to the rotor. A force may be applied between the rotor and stator in a direction to move the carriage relative to the frame.

A method and system for handling a rotor and a stator of a rotary machine employs a frame and a carriage. The carriage rides on and is guided by a parallel pair of tracks that extend away from the frame. The frame and tracks both rest on a horizontal surface. The stator can be placed on the carriage and the frame can be used to provide support to the rotor. A force may be applied between the rotor and stator in a direction to move the carriage relative to the frame.

An axial flux machine is provided with an integrated clutch assembly, which is housed within the bore of an annulus-shaped stator of the machine. First and second rotors, located either side of the stator are attached to the clutch basket of the clutch assembly, and rotate in unison relative to the stator. A machine housing is provided between the stator and an engagement face of the clutch basket, seated on bearings between the clutch basket and machine housing, to provide a rigid structure.

A speed reducing device includes a motor and a speed reducing mechanism. The speed reducing mechanism includes at least one roller assembly, a cycloid disc, at least one fixing disc and a positioning assembly. The roller assembly is disposed within a rotor portion of the motor. While the roller assembly is rotated with the rotor portion, the roller assembly is eccentrically revolved. The roller assembly includes a wheel disc and at least one roller. The cycloid disc includes a main body and at least one cycloid tooth structure. The cycloid tooth structure is protruded from an outer periphery of the main body and in contact with the corresponding roller. While the roller assembly is eccentrically revolved, the at least one cycloid tooth structure is pushed against the corresponding roller, so that the cycloid disc is correspondingly rotated.

A rotor has a rotor body having: a flange with a circumferential array of discontiguous apertures; and a surface spaced apart from the flange. One or more rotor balance weight assemblies each have a weight and a fastener. The weight has: a passageway having a first end and a second end; an internal thread along the passageway; and a boss at the first end of the passageway. The boss is in a respective one of the apertures. The fastener has: a shank having a first end and a second end and an external thread engaged to the passageway internal thread; an engagement feature at the shank first end for engagement by a tool to turn the fastener; and a head at the second end contacts the surface.

A rotor according to an embodiment includes a cylindrical magnet, a holder, and a balance adjusting portion. The cylindrical magnet has a bore portion into which a rotary shaft is inserted, the inner diameter of the bore portion being larger than the outer diameter of the rotary shaft. The holder is made of resin, and has a tubular portion formed in the bore portion of the magnet and a protruding portion protruding from the magnet in the rotation axis direction, the holder being press-fitted onto the rotary shaft. The balance adjusting portion is press-fitted onto the rotary shaft with the protruding portion interposed therebetween.

A rotor sheet includes a central cut-out and is divided into a plurality of sectors, each including a first half sector and a second half sector delimited from the first half sector by a radial central line, wherein a through-opening configuration, which has two parallel edge lines extending along an extension direction, is formed inside the first half sector, and a further through-opening configuration, mirror-symmetrical to the through-opening configuration with respect to the central line, is formed inside the second half sector, wherein the first through-opening configuration includes a relief through-opening inscribed inside an incircle-free trapezoid having two bases extending parallel to the central line and two legs extending on a first straight line having a first angular spacing from the central line, and on a second straight line having a second angular spacing from the central line, wherein the first and second straight lines intersect at an acute angle.

Geared motor including a brushless electric motor, a planetary reduction gear and an output shaft with a longitudinal axis, fixed in rotation to the planetary reduction gear, the electric motor including a stator, a rotor housed in a housing in the stator and surrounded by a lateral surface of the housing, at least two coils attached to the stator and facing a portion of an outer lateral surface of the rotor. The stator and the rotor define at least one first zone with a first air gap and one second zone with a second air gap between them, the first air gap being less than the second air gap, the first zone including the coils, such that the attraction force exerted by the stator on the rotor is lower in the second zone than in the first zone.