A dual-rotor machine comprising a dual rotor support structure rotatably connected to a frame. A stationary stator is disposed between the rotors and is fixed to the frame. An inner rotor and outer rotor, each comprising a permanent magnet Halbach array, are coaxially disposed with the stator and are rotable about the stator. In this configuration, the inner rotor channels its magnetic flux to its outside, while the outer rotor channels its magnetic flux to its inside. The magnetic flux density at the stator for the dual-rotor machine can be as high as 2 Tesla or higher for high-grade neodymium-iron-boron permanent magnet material, and the stored magnetic energy for conversion to mechanical or electrical energy available to the stator may be at least 0.5 kJ/m. The rotor Halbach arrays may comprise monolithic permanent magnets with continuously variable magnetic field direction.

Disclosed is a large-current and low-voltage servo motor, which includes: a housing with a mounting space inside; a stator assembly including a stator core arranged in the mounting space, and an inner circumference of the stator core being provided with stator slots for receiving coils, a coil winding being received in the stator slots, and the coil winding being a three-phase coil winding; and a rotor assembly including a rotor core, the stator core being sleeved on an outer peripheral surface of the rotor core, a plurality of magnetic steels of an arc shape being adsorbed on an outer peripheral surface of the rotor core, each magnetic steel having an inner arc surface and an outer arc surface eccentrical to the inner arc surface, and the plurality of magnetic steels are sequentially distributed to form alternate N and S polarities.

Disclosed is a large-current and low-voltage servo motor, which includes: a housing with a mounting space inside; a stator assembly including a stator core arranged in the mounting space, and an inner circumference of the stator core being provided with stator slots for receiving coils, a coil winding being received in the stator slots, and the coil winding being a three-phase coil winding; and a rotor assembly including a rotor core, the stator core being sleeved on an outer peripheral surface of the rotor core, a plurality of magnetic steels of an arc shape being adsorbed on an outer peripheral surface of the rotor core, each magnetic steel having an inner arc surface and an outer arc surface eccentrical to the inner arc surface, and the plurality of magnetic steels are sequentially distributed to form alternate N and S polarities.

A first layer, a second layer, and a third layer of a sleeve of a rotor are integrated side by side in this order from the radial center of the sleeve toward the outside. The first layer includes a first fiber-reinforced resin including a first carbon fiber extending in a direction inclined with respect to both the axis of the rotor shaft and a circumferential direction of the sleeve. The second layer includes a second fiber-reinforced resin including a second carbon fiber extending along the circumferential direction of the sleeve. the third layer includes a third fiber-reinforced resin including a third carbon fiber extending along the circumferential direction of the sleeve. An elastic modulus of the third layer is larger than an elastic modulus of the second layer.

A first layer, a second layer, and a third layer of a sleeve of a rotor are integrated side by side in this order from the radial center of the sleeve toward the outside. The first layer includes a first fiber-reinforced resin including a first carbon fiber extending in a direction inclined with respect to both the axis of the rotor shaft and a circumferential direction of the sleeve. The second layer includes a second fiber-reinforced resin including a second carbon fiber extending along the circumferential direction of the sleeve. the third layer includes a third fiber-reinforced resin including a third carbon fiber extending along the circumferential direction of the sleeve. An elastic modulus of the third layer is larger than an elastic modulus of the second layer.

An example rotor assembly includes a rotor core having an axial length and configured to rotate about a longitudinal axis. The rotor core includes a first wall and a second wall radially within the first wall and defining a fluid flow path configured to guide a fluid along an inner surface of the first wall.

The present invention may provide a motor including a housing, a stator disposed in the housing, a shaft disposed in the stator, a guide part in contact with an outer circumferential surface of the shaft, and a magnet coupled to the guide part, wherein the guide part includes a first guide disposed on a side surface of the shaft and a second guide extending from the first guide in an axial direction.

The present invention may provide a motor including a housing, a stator disposed in the housing, a shaft disposed in the stator, a guide part in contact with an outer circumferential surface of the shaft, and a magnet coupled to the guide part, wherein the guide part includes a first guide disposed on a side surface of the shaft and a second guide extending from the first guide in an axial direction.

The present invention may provide a motor including a shaft, a rotor coupled to the shaft, and a stator disposed to correspond to the rotor, wherein the rotor includes a rotor core, a magnet disposed on an outer surface of the rotor core, and a guide in contact with the rotor core, the guide includes a first member in contact with one side surface of the rotor core and a plurality of second members (420, 430) which extend from the first member in an axial direction and are in contact with a side surface of the magnet, and positions of one side end portions and the other side end portions of the second members are different from each other in a circumferential direction.

The present invention may provide a motor including a shaft, a rotor coupled to the shaft, and a stator disposed to correspond to the rotor, wherein the rotor includes a rotor core, a magnet disposed on an outer surface of the rotor core, and a guide in contact with the rotor core, the guide includes a first member in contact with one side surface of the rotor core and a plurality of second members (420, 430) which extend from the first member in an axial direction and are in contact with a side surface of the magnet, and positions of one side end portions and the other side end portions of the second members are different from each other in a circumferential direction.