Abstract: A compressor has: a motor that has a stator provided around an axis of a rotor; a rotating shaft that is fixed to the rotor; a bearing that supports the rotating shaft; an impeller that is connected to the rotating shaft and compresses fluid; and a casing that accommodates the motor. In this compressor, the stator has: a coil that encircles the axis of the rotor; and a stator core that has a magnetic pole facing, in a radial direction of the rotor, an outer circumferential surface of the rotor, via a gap.

Abstract: An electric motor includes: a rotor configured to be rotatable about a rotation axis and to which a fluid drive unit is fixed; a stator that is disposed inward of the rotor and includes claw pole stator units, the claw pole stator units each including a winding that is wound in an annular shape around the rotation axis and an iron core that surrounds the winding; a hole that is provided in one end portion of the rotor so as to penetrate from inside to outside of the rotor, the stator being provided in the inside and the fluid drive unit being fixed to the outside of the rotor; and an inflow path configured to cause a surrounding fluid to flow into inside of a stator unit, the stator unit being provided at one other end portion opposite to the one end portion in an axial direction.

Abstract: A technique by which the magnetic flux of the magnetic pole facing the stator of the magnet can be further increased in a rotor, is provided.

Abstract: Techniques to reduce the d-axis inductance in a rotor are provided. According to one embodiment in the present disclosure, a rotor 20 includes permanent magnets 22 and 23 housed in magnet slots different from each other formed in an iron core 21, and arranged in series magnetically; and a flux barrier (cavity 24) provided to be close to an end in a direction orthogonal to a direction of a main magnetic flux, for each of the permanent magnets 22 and 23 arranged in series magnetically. Two instances of the flux barrier corresponding to the respective permanent magnets 22 and 23 arranged in series magnetically, communicate with each other. According to another embodiment in the present disclosure, a motor 1 includes the rotor 20 described above.

Abstract: A first rotor core including a plurality of gaps penetrating through the first rotor core along an axial direction is provided. A second rotor core being in contact with an axial end of the first rotor core and having a plurality of magnet-housing slots facing the gaps is also provided. The gaps have a magnetic resistance lower than that of the magnet-housing slots.

Abstract: A motor includes a driving shaft, a rotor attached to the driving shaft, and a stator having a substantially cylindrical stator core provided around the rotor, and a plurality of coils wound around the stator core in a distributed winding manner. The stator core includes three separated stator core parts aligned along a peripheral direction, and each of the coils is disposed so as not to lie astride any two of the three separated stator core parts. At least one coil end of the plurality of the coils is disposed to pass through an inner side relative to an inner peripheral surface of the stator core.

Abstract: A motor includes a driving shaft, a rotor attached to the driving shaft, and a stator having a substantially cylindrical stator core provided around the rotor, and a plurality of coils wound around the stator core in a distributed winding manner. The stator core includes three separated stator core parts aligned along a peripheral direction, and each of the coils is disposed so as not to lie astride any two of the three separated stator core parts. At least one coil end of the plurality of the coils is disposed to pass through an inner side relative to an inner peripheral surface of the stator core.

Abstract: A three-phase AC motor (4) has a configuration in which a q-axis inductance is larger than a d-axis inductance by a predetermined amount or more to allow smoothing of power fluctuations due to the power supply voltage of the AC power source (3).

Abstract: A first non-magnetic portion, a second non-magnetic portion, and a third non-magnetic portion are arranged around an axis, from an end toward the center of a permanent magnet burying hole. A fourth non-magnetic portion is further provided between the second non-magnetic portion and the third non-magnetic portion. Angles around the axis are determined as follows with reference to a position between permanent magnet burying holes. The position between the first non-magnetic portion and the second non-magnetic portion is expressed by a first angle. The position between the third non-magnetic portion and the fourth non-magnetic portion is expressed by a second angle, and the second angle is twice the first angle. The end of the third non-magnetic portion located closer to the pole center is expressed by a third angle.

Abstract: A rotor includes a plurality of permanent magnets arranged annularly around an axis and a rotor core. The rotor core includes 2N (where N is a natural number) magnetic pole faces and a plurality of magnetic barriers. The 2N magnetic pole faces produce, due to the plurality of permanent magnets, magnetic poles in a radial direction in such a manner that different polarities can be alternately produced around the axis. The magnetic barriers are provided at a side close to the magnetic pole faces relative to the permanent magnets. At least one of the magnetic barriers is provided in each region obtained by equally dividing the rotor core into (2N+1), ((N+1)×2) or ((N?1)×2) angles around the axis.

Abstract: A first rotor core including a plurality of gaps penetrating through the first rotor core along an axial direction is provided. A second rotor core being in contact with an axial end of the first rotor core and having a plurality of magnet-housing slots facing the gaps is also provided. The gaps have a magnetic resistance lower than that of the magnet-housing slots.

Abstract: A field element core has a perimeter exposed around a rotation axis and a plurality of field magnet insertion holes circularly disposed around the rotation axis P. A radius between the perimeter and the rotation axis P decreases in a monotonically non-increasing manner from a pole center toward an interpole and then increases in a monotonically non-decreasing manner in a region between the pole center and the interpole in a circumferential direction.

Abstract: A rotating electric machine includes a case, a plurality of teeth, coils and insulating films. The teeth are circumferentially arranged around a predetermined axis forming a center of the teeth. Each tooth has a first end disposed radially at an opposite side thereof from the predetermined axis. The a back yoke has a circular outer periphery, and a cylindrical inner periphery connecting the first ends of the teeth. The outer periphery has a plurality of concave parts opening radially inwardly toward the teeth at positions overlapping with the teeth as viewed radially. A minimum distance measured from an exposure surface of each tooth to the concave part overlapping therewith is smaller than a radial width of the back yoke at a portion where the concave parts are not provided. The exposure surfaces extend radially inwardly of the inner periphery.

Abstract: An outer rotor motor comprises a rotor rotating about an axis, and a fixed stator. Provided over the inner peripheral surface of a cylindrical part of a fan connecting resin member are a ring-shaped yoke, a ring-shaped rotor magnet fixed to a fixing slot defined in the radially inner surface of the yoke, and yokes fixed to fixing slots defined in a radially inner surface of the rotor magnet. The rotor magnet is so magnetized that magnetic poles alternately change in a circumferential direction. The yoke covers a radially outer surface of the rotor magnet, and parts on a radially outer side of an axially upper surface and an axially lower surface of the rotor magnet.

Abstract: A motor includes a driving shaft, a rotor attached to the driving shaft, and a stator having a substantially cylindrical stator core provided around the rotor, and a plurality of coils wound around the stator core in a distributed winding manner The stator core includes three separated stator core parts aligned along a peripheral direction, and each of the coils is disposed so as not to lie astride any two of the three separated stator core parts. At least one coil end of the plurality of the coils is disposed to pass through an inner side relative to an inner peripheral surface of the stator core.

Abstract: A three-phase AC motor (4) has a configuration in which a q-axis inductance is larger than a d-axis inductance by a predetermined amount or more to allow smoothing of power fluctuations due to the power supply voltage of the AC power source (3).

Abstract: A rotor includes a plurality of permanent magnets arranged annularly around an axis and a rotor core. The rotor core includes 2N (where N is a natural number) magnetic pole faces and a plurality of magnetic barriers. The 2N magnetic pole faces produce, due to the plurality of permanent magnets, magnetic poles in a radial direction in such a manner that different polarities can be alternately produced around the axis. The magnetic barriers are provided at a side close to the magnetic pole faces relative to the permanent magnets. At least one of the magnetic barriers is provided in each region obtained by equally dividing the rotor core into (2N+1), ((N+1)×2) or ((N?1)×2) angles around the axis.

Abstract: A field element core has a perimeter exposed around a rotation axis and a plurality of field magnet insertion holes circularly disposed around the rotation axis P. A radius between the perimeter and the rotation axis P decreases in a monotonically non-increasing manner from a pole center toward an interpole and then increases in a monotonically non-decreasing manner in a region between the pole center and the interpole in a circumferential direction.

Abstract: An outer rotor motor comprises a rotor rotating about an axis, and a fixed stator. Provided over the inner peripheral surface of a cylindrical part of a fan connecting resin member are a ring-shaped yoke, a ring-shaped rotor magnet fixed to a fixing slot defined in the radially inner surface of the yoke, and yokes fixed to fixing slots defined in a radially inner surface of the rotor magnet. The rotor magnet is so magnetized that magnetic poles alternately change in a circumferential direction. The yoke covers a radially outer surface of the rotor magnet, and parts on a radially outer side of an axially upper surface and an axially lower surface of the rotor magnet.

Abstract: A motor includes a rotor core, permanent magnets and non-magnetic layers. The permanent magnets are embedded in the rotor core with each of the permanent magnets defining a pole of the rotor having a pole center and a peripheral edge section, with the peripheral edge section located in a vicinity between the poles and a vicinity of the rotor surface. The non-magnetic layers are located in a vicinity of the rotor surface at a pole center side position with respect to the peripheral edge section of each of the permanent magnets. The peripheral edge sections and the non-magnetic layers are positioned to cancel 5-th or 7-th order harmonics of an induction voltage. The poles are disposed at every approximately constant interval, varying in a constant angle. The peripheral edge sections and the non-magnetic layers are independent from one another, and the rotor core is interposed between them.