Abstract:
An electric motor according to the present invention includes a rotor core, a stator core provided so as to face the rotor core in the radial direction, and a permanent magnet buried in the vicinity of an outer circumferential part of the rotor core, wherein the outer circumferential part of the rotor core and an inner circumferential part of the stator core are formed in such a manner that a radial gap length between the outer circumferential part of the rotor core and the inner circumferential part of the stator core for one magnetic pole of the permanent magnet becomes a gap length along a gap length regulated by an expression capable of making magnetic flux density distribution between the outer circumferential part of the rotor core and the inner circumferential part of the stator core a sinusoidal waveform.
Abstract:
In general, one aspect of the subject matter described in this specification features a torquer apparatus that includes a rotor with magnetic poles such that, when radially projected on a concentric octahedron, the same symmetrical pattern is obtained on all faces of the octahedron, the polarity of the poles projected on two adjacent faces of the octahedron being opposite. A stator with at least twenty poles magnetized with coils and such that, when radially projected on a concentric icosahedron, the same symmetrical pattern is obtained on all faces of the icosahedron, the stator being-in nominal position-concentric with the rotor. Real-time measurements, or equivalent information, of the position of the rotor with respect to the stator, and real-time measurements, or equivalent information, of exported torque from the stator, or of the orientation of the rotor with respect to the stator can be obtained. A controller for controlling the current in the coils based on the measurements, or the equivalent information, such that the rotor is magnetically held in the nominal position, and that the desired torque is exported.
Abstract:
An electrical machine, e.g. water turbine or bow propeller, includes a ring shaped stator ring and inside it a rotatable rotor ring with to it mounted blades flown around by the fluid. Magnetic elements generate axial directed magnetic forces between rotor and stator. Stabilizing elements keep the rotor during operation in an axial stable position. A magnetic preload is active in the machine and the amount of this magnetic preload is set by the mechanical bearing of the rotor ring, such that merely variation is required in a dimension of the mechanical bearing to optimize a for the rest identical machine for different nominal flow speeds of the fluid through the machine.
Abstract:
In a rotating machine, a base is configured such that a housing space is formed by joining a cover to the base and has a bearing hole communicating ambient air and the housing space. A sleeve is fitted into the bearing hole and formed with a porous material. The circumferential lower end portion of the sleeve is exposed to ambient air from the bearing hole. At least part of the pores on the surface of the circumferential lower end portion in contact with ambient air are filled in.
Abstract:
A permanent magnet rotating electric machine comprises a stator having stator windings wound round a stator iron core and a permanent magnet rotor having a plurality of inserted permanent magnets in which the polarity is alternately arranged in the peripheral direction in the rotor iron core. The rotor iron core of the permanent magnets is composed of magnetic pole pieces, auxiliary magnetic poles, and a stator yoke, and furthermore has concavities formed on the air gap face of the magnetic pole pieces of the rotor iron core of the permanent magnets, gently tilting from the central part of the magnetic poles to the end thereof. In a permanent magnet rotating electric machine, effects of iron loss are reduced, and an electric car using highly efficient permanent magnet rotating electric machine are realized.
Abstract:
The disclosure discloses a linear motor comprising: a field system in which a plurality of permanent magnets are linearly arranged: and an armature configured to face said field system and to have an armature core provided with armature windings, said linear motor running along a predetermined direction of travel with either said field system or said armature serving as a mover and the other serving as a stator, wherein: said armature core comprises: auxiliary teeth that are respectively provided on both ends along said direction of travel and around which said armature windings are not wound; and a plurality of main teeth that are provided between said auxiliary teeth, and each of said auxiliary teeth comprises an end portion shape in which a dimension in a teeth height direction orthogonal to said direction of travel is variable along said direction of travel.
Abstract:
According to the invention, a system for aiming an antenna in a direction below-horizon is disclosed. The system may include a support member, a spherical structure, and at least one arm. The support member may be coupled with a surface. The spherical structure may be coupled with the support member and the spherical structure may be at least partially spherical in shape about a central point. The at least one arm may be rotatably coupled with the spherical structure. The at least one arm may be coupled with the antenna. The at least one arm may at least partially defines a void. And the support member may be at least partially disposed within the void when the antenna is aimed in the direction below-horizon.
Abstract:
A brushless motor includes: a stator assembly including a stator core which includes a plurality of pole teeth each having a winding therearound; and a rotor assembly including a magnet which has a ring shape, is rotatably disposed so as to oppose the pole teeth of the stator core and which is circumferentially magnetized with a plurality of magnetic poles with opposite polarities alternating with each other, wherein the number of the pole teeth of the stator core is twice the number of the magnetic poles of the magnet such that each magnetic pole opposes a pair of adjacent pole teeth, one pair of adjacent windings have the same number of winding turns and the same winding direction as each other, and wherein another pair of windings located next to the one pair of windings have a winding direction opposite to the winding direction of the one pair of windings.
Abstract:
The invention relates to a secondary part (2, 3) of a linear electrical machine (5), wherein the secondary part (2, 3) has permanent magnets (11) and a mount (13). The secondary part (2, 3) has spacer elements (9), wherein an installation height of the secondary part (2, 3) is also determined by means of the spacer elements (9). Tolerances of the installation height can be maintained more easily by means of the spacer elements. In a method for manufacturing a secondary part (2, 3) of a linear electrical machine (5), the spacer elements (9) are cast together with the mount (13) on which the permanent magnets (9) are arranged such that the permanent magnets (9) are embedded in the casting compound (15) and the casting compound (15) forms the surface of the secondary part (2, 3) in the region of the permanent magnets (11), wherein the spacer elements (9) protrude out of the casting compound (15) such that part of the surface of the secondary part (2, 3) is also formed by the spacer elements (9).