Abstract: A lightweight impeller is provided for use in a pressurised gas source for a CPAP or other breathing assistance apparatus. The impeller can be shroudless or otherwise lightweight.

Abstract: A stator includes a plurality of stator elements, each stator element comprising a c-shaped core having two poles. Each pole of each stator element is secured to a pole of an adjacent stator element by a bridge formed of a non-magnetic material molded onto the poles.

Abstract: A rotating electrical machine having high efficiency and torque, in which the stator is provided with a stator core including an annular yoke portion and n winding poles radially extending from the annular yoke portion, the rotor core includes a circumference portion having small teeth substantially in parallel with the rotary shaft, and an end surface portion having small teeth substantially perpendicular to the rotary shaft, the circumference portion of the winding pole in the stator and the circumference portion of the rotor core in the rotor face each other via an air gap to provide a radial gap, and the end surface portion of the winding pole in the stator and the end surface portion of the rotor core in the rotor face each other via an air gap to provide an axial gap, and n is an integer of 2 or more.

Abstract: A permanent magnet machine is provided including a stator and a rotor, the rotor being adapted to rotate relative to the stator, the rotor including a plurality of permanent magnets separated in the circumferential direction from each other by radially extending rotor pole pieces for concentrating the magnetic flux from the permanent magnets, the stator having a structure that defines radial limits of an air gap between the stator and the rotor for communicating magnetic flux between the stator and the rotor, wherein at least some of the permanent magnets extend radially outside the radial limits of the air gap as defined by the stator structure.

Abstract: A magnetic-pole portion can be formed by thread cutting, whereby a motor can be provided at lower cost as compared to a case where the magnetic-pole portion is formed by press-working.

Abstract: A drive apparatus which is small in size, short in axial length, low in cost, and high in output. A stepping motor as the driving apparatus includes a first coil, a second coil, a magnet, and a rotor comprised of a core and a rotary shaft. First through fourth outer magnetic pole portions are opposed to the outer peripheral surface of the magnet with a predetermined gap between them. The first and the second coils are disposed adjacent to the magnet in an axial direction of the rotary shaft and disposed at respective ends of the rotary shaft. The first and second outer magnetic pole portions are inserted inside the first and second coils, respectively. As viewed in the circumferential direction of the magnet, the third and fourth outer magnetic pole portions are disposed close to the first and second outer magnetic pole portions, respectively.

Abstract: A vibration motor includes a housing, a stator (10) received in the housing (30) and a rotor (20) rotatably disposed in the stator. The stator includes two claw-pole assemblies (11) arranged back-to-back, and a shaft (23) being fixedly connected with the two claw-pole assemblies. The rotor includes a bearing (22) rotatably mounted around the shaft, a permanent magnet (26) mounted around the bearing, and an eccentric weight (24) fixedly attached to the permanent magnet. The eccentric weight includes a main body (240) and at least one inserting portion (244) having a density higher than that of the main body.

Abstract: The multiphase step motor is capable of reducing vibrations of a rotor and torque ripples in spite of switching current flowing through stator coils. Stator units are divided into 2n (n is an integer one or more) per one phase and coaxially layered, and the stator units of the same phase are plane-symmetrically layered with respect to a plane perpendicular to an axial center of a stator.