An electric machine including a shaft, a rotor back assembly surrounding a portion of the shaft, and two or more permanent magnets radially positioned around the perimeter of the rotor back assembly. The electric machine also includes a rotor fan with multiple fan blades formed in an exterior surface of the rotor back assembly and one or more ventilation channels extending through the rotor back assembly. Methods of exporting heat from an electric machine, wither from a machine housing or through the shaft is also disclosed. The heat exportation methods feature the circulation of a fluid with the rotor fan through the ventilation channels and into contact with the housing, or exporting heat from the rotor back assembly through the shaft.

A motor apparatus having a rotor that includes one or more permanent magnets disposed in ring-like manner, wherein similar poles of adjacent magnets face one another, and further wherein a gear mechanism (e.g., a toothed ring) is configured to transfer rotation from the rotor to an external gear mechanism. The motor may also include a stator comprising one or more solenoids and a bearing assembly that includes a rotating bearing element integrated with a toothed element for engaging with a gear and axle assembly. The rotating bearing element and integrated toothed gear element may pass through cavities of the main solenoids and provide for minimal cavity size, improving motor efficiencies.

A rotor (1) for an electric machine (16) which has at least two poles and an even number of N≥6 stacked rotor modules (2a-2f), wherein the rotor modules (2a-2f) for each pole have a magnet component (3a-3f; 3a-3h), and magnet components (3a-3f; 3a-3h) which embody the same pole form a corresponding magnet component arrangement (4a, 4b, 4f), wherein the first to Nth rotor module (2a-2f) are arranged in ascending sequence of their designation in the axial direction, wherein each magnet component (3a-3f; 3a-3h), belonging to one of the magnet component arrangements (4a), of the first to Nth rotor module (2a-2f) is arranged in each case at a stagger angle α.sub.1 . . . α.sub.N in the circumferential direction, wherein the stagger angles α.sub.i for 1≤i≤N/2 have a value α.sub.i=α.sub.0+k.Math.β where 0≤k≤[(N/2)−1], α.sub.0 is a fixed angular position in the circumferential direction, β is a fixed offset angle, and all the stagger angles α.sub.i are different from one another, wherein the stagger angles α.sub.m for [(N/2)+1]≤m≤N have a value α.sub.m=α.sub.N−m+1, characterized in that,
the stagger angle α.sub.i of at least two of the magnet components (3b) belonging to the magnet component arrangement (4a) is unequal to α.sub.0+(i−1).Math.β,

The present invention relates to a stator core for improving the fixing properties of a magnet wire, and a motor in which the same is applied. Provided is a stator core which comprises a protrusion pattern part for fixing the distal end portion of a magnet wire, and thus eliminates a process of fixing the wire using a separate member during a wiring process, thereby improving processability and inhibiting an insulating film of the magnet wire from being damaged by an external force such as vibration.

The present invention relates to a stator core for improving the fixing properties of a magnet wire, and a motor in which the same is applied. Provided is a stator core which comprises a protrusion pattern part for fixing the distal end portion of a magnet wire, and thus eliminates a process of fixing the wire using a separate member during a wiring process, thereby improving processability and inhibiting an insulating film of the magnet wire from being damaged by an external force such as vibration.

A rotor includes a rotor core, permanent magnets, and a tubular non-magnetic cover. The permanent magnets are arranged along an outer surface of the rotor core in the circumferential direction. The permanent magnets each include a curved outer surface as viewed in the axial direction. The tubular non-magnetic cover covers the outer surfaces of the permanent magnets. The rotor core includes at least two stacked cores. Each stacked core includes a stack of core sheets. One of the stacked cores is formed from a material having a lower hardness than the other stacked core.

A rotor includes a rotor core, permanent magnets, and a tubular non-magnetic cover. The permanent magnets are arranged along an outer surface of the rotor core in the circumferential direction. The permanent magnets each include a curved outer surface as viewed in the axial direction. The tubular non-magnetic cover covers the outer surfaces of the permanent magnets. The rotor core includes at least two stacked cores. Each stacked core includes a stack of core sheets. One of the stacked cores is formed from a material having a lower hardness than the other stacked core.

A rotating electrical machine capable of obtaining a higher torque while limiting the amount of permanent magnets used. A magnetic pole of a rotor includes an auxiliary magnet embedded in a rotor core and at least one main magnet arranged on an outer circumferential side than the auxiliary magnet of the rotor. In each magnetic pole, the distance from an end of the main magnet, the end facing the auxiliary magnet, to the auxiliary magnet facing the main magnet is shorter than the length of the main magnet in the radial direction. In a cross-section orthogonal to the rotation axis of the rotating electrical machine, the main magnets of each magnetic pole are arranged so as to be asymmetrical about a virtual line passing the rotation axis and axisymmetrically dividing the auxiliary magnet.

A rotating electrical machine capable of obtaining a higher torque while limiting the amount of permanent magnets used. A magnetic pole of a rotor includes an auxiliary magnet embedded in a rotor core and at least one main magnet arranged on an outer circumferential side than the auxiliary magnet of the rotor. In each magnetic pole, the distance from an end of the main magnet, the end facing the auxiliary magnet, to the auxiliary magnet facing the main magnet is shorter than the length of the main magnet in the radial direction. In a cross-section orthogonal to the rotation axis of the rotating electrical machine, the main magnets of each magnetic pole are arranged so as to be asymmetrical about a virtual line passing the rotation axis and axisymmetrically dividing the auxiliary magnet.

An electric submersible pump (ESP) that has a motor section for driving the ESP. The motor section has a stator has an inner surface, winding channels disposed axially therein and windings disposed in the winding channels to generate an electromagnetic field when power is supplied to the ESP. The motor section also has a rotor rotatably disposed in the stator. The rotor has permanent magnets or induction windings disposed therein that are responsive to the electromagnetic field to facilitate rotation of the rotor relative to the stator. The motor section also includes a manipulated air gap disposed between the rotor and the stator that the electromagnetic field crosses. The manipulated air gap provides a desired constant radially directed load on the rotor to stabilize the rotor when instability of the motor section occurs. A method of desiging and constructing the ESP disclosed herein. To design and construct the ESP, a desired constant radially directed load is determined for an electric submersible pump (ESP) to stabilize the ESP when instability of an electromagnetic field of the ESP occurs. The air gap is manipulated to achieve the desired constant radially directed load or the design of a stator of the ESP is manipulated to achieve the desired constant radially directed load. The ESP can then be constructed.