A number of illustrative variations may include a rotor core for an electric motor comprising permanent magnets wherein the rotor core comprises lobes of the core material that magnets may be attached to.

A fan module including a first casing, a second casing, a supporting assembly, a stator assembly, and a rotor assembly. The first casing includes a first vent. The second casing is connected to the first casing and an accommodating space is formed between the first casing and the second casing. The supporting assembly is disposed at the accommodating space, connected to the second casing, and includes a first end and a second end. The stator assembly is disposed at the accommodating space, fixed on the second casing, and disposed around the supporting assembly. The rotor assembly is disposed at the accommodating space, rotatably disposed around the stator assembly, and corresponding to the first vent. The first end of the supporting assembly passes through the rotor assembly and the first vent for protruding out of the first casing.

Provided is a motor for a drone comprising: a rotary shaft; a stator including a hole in which the rotary shaft is disposed; a rotor disposed outside the stator; and a housing coupled to the stator, wherein the stator comprises a stator core and a coil wound around the stator core, wherein the stator core comprises an annular yoke coupled to the housing, teeth extending radially from the yoke, and a shoe disposed at one end of the teeth, wherein the teeth comprise protrusions projecting from the side surface thereof. As such, the present invention provides an advantageous effect of securing an air flow path for heat radiation to enhance a heat radiating effect while preventing water or foreign matter from flowing into the motor.

A projectile includes a body and a power generator secured to the body. The power generator includes a stator and a ring including at least one magnet and extending radially around and freely rotatable about at least a portion of the stator. A power generator for a projectile is also provided.

The disclosure concerns a fan wheel, including a base body with a rotational axis, and a swing part. The base body is made of a first material and the swing part is made of a second material. The density of the second material and the density of the first material are different. The swing part has a surface. The swing part is at least partially surrounded by the base body, so that the base body covers at least 80%, in particular at least 90%, preferably at least 95% of the surface of the swing part. The first material has a first thermal expansion coefficient, and the second material has a second thermal expansion coefficient. The second thermal expansion coefficient amounts to 70% to 110%, in particular 80% to 100%, preferably 85% to 95% of the first thermal expansion coefficient, and/or the swing part is substantially annular and runs fully closed around the rotational axis.

A radial flux rotary electric machine having an exterior-rotor configuration is shown. The machine has a permanent-magnet rotor comprising permanent magnets in a Halbach array, and an air-cored stator interior to the rotor having teeth defining tapered slots and distributed windings around the teeth to form coils in a double-layer arrangement, the windings being comprised of a plurality of phase windings. For each tooth T having a slot S1 on one side thereof and a slot S2 on another side thereof, a coil side C1 of a phase winding is arranged to occupy a radially inner layer of the slot S1 and a coil side C2 of the same phase winding is arranged to occupy a radially outer layer of the slot S2, wherein the coil side C1 has a smaller circumferential dimension and a larger radial dimension than the coil side C2.

A magnetic pole module, an electric motor rotor and a method for manufacturing the electric motor rotor are provided. The electric motor rotor includes a rotor yoke and multiple magnetic pole modules disposed on the rotor yoke, each of the magnetic pole modules including a base plate, a housing, and a pair of magnetic pole units that are accommodated in an accommodating space formed by the base plate and the housing and have opposite polarities, and a pair of magnetic pole units in each of the magnetic pole modules are spaced apart from each other by a first distance in a circumferential direction of the rotor yoke. The electric motor rotor can give consideration to the properties, such as cogging torque and torque pulsation, of a generator, the protection of magnetic poles and the mechanical fixation of the magnetic pole.

A column type coreless motor is provided, having has no iron loss, low heat loss and high efficiency. The motor includes a stator, a rotor and a motor housing, wherein the rotor is a column type structure with a U-shaped annular groove, and the stator is placed in the U-shaped annular magnetic field of the rotor. In some embodiments, the stator is made by solidifying a coil therein with a thermosetting material through a pressure device, and the coil is wound by combining multiple enameled wires into a phase line, successively superposing three-phase lines, and winding each phase line in a toothed circle shape. The rotor is provided with a heat dissipation fan, and the fan discharges the heat generated by the coil out of the motor through a heat dissipation air passage in the motor housing, effectively ensuring the heat dissipation effect of the motor.

An integrated hybrid rotary assembly is configured to provide power, torque and bi-directional communication to a rotatable sensor, such as a lidar, radar or optical sensor. A common ferrite core is shared by a motor, rotary transformer and radio frequency communication link. This hybrid configuration reduces cost, simplifies the manufacturing process, and can improve system reliability by employing a minimum number of parts. The assembly can be integrated with the sensor unit, which may be used in vehicles and other systems.

A liquid-cooled rotating electric machine may include an inner stator and outer rotor configured to rotate about the stator. A hub may be disposed within the inner stator and a heat exchanger may be disposed in the hub. The heat exchanger may be configured to enable the flow a liquid through it to dissipate heat from the stator.