74results about How to "Reduce core loss" patented technology

The invention discloses a double-stator magnetic field modulation permanent magnet motor comprising an inner stator, an outer stator, and a rotor. Air gaps are formed between the rotor and the inner and outer stators. The rotor is formed by magnetic conductors and non-magnetic conductors which are arranged alternately. The outer stator is formed by outer stator teeth, radial magnetizing permanent magnets, and an armature winding. The radial magnetizing permanent magnets adhere to the inner surfaces of the outer stator teeth. Adjacent permanent magnets on the same outer stator tooth have opposite magnetizing directions. The inner stator is just formed by inner stator teeth equipped with grooves along the circumferential direction and an armature winding in the grooves while not being provided with any permanent magnet. According to the double-stator magnetic field modulation permanent magnet motor, the two armature windings are used while the amount of the permanent magnets is not increased. Thus, an armature magnetic field is fully utilized and a power factor and the power density are increased. Compared with a product in the prior art, the double-stator magnetic field modulation permanent magnet motor is not provided with a rotor magnetic conductive yoke portion, decreased in rotor size and iron loss, and increased in the power density and efficiency, and can be used in power systems such as electric automobile, wind power generation or the like.

Disclosed herein is a transversal switched reluctance motor including: a rotor assembly formed by arranging a plurality of rotors including a rotor pole mounting part having a shaft coupled to an inner portion thereof and a plurality of rotor poles coupled to the rotor pole mounting part along an outer peripheral surface thereof in a direction of the shaft; and a stator assembly including a plurality of stators each including a coil enclosing an outer peripheral surface of the rotor assembly so that the rotor assembly is rotatably received in an inner portion thereof and a plurality of stator cores fitted with the coil from one side direction thereof along an outer peripheral surface thereof to thereby face the plurality of rotor poles, wherein the stator core has a C shaped cross section with respect to the direction of the shaft around which the rotor assembly rotates.

A two-phase switched reluctance machine is provided using discontinuous core structures as the stator for low-cost, high-performance drives. This discontinuous stator core structure contains short flux paths and maximum overlap between the rotor poles and stator poles in the stator discontinuous core structures, regardless of the rotor position. Example configurations of such core structure include E-core, L-core and I-core configurations. Using less steel and magnet wire than in conventional SRM designs results in cost savings of stator material and winding material. Efficiency of this novel SRM is improved because of shorter flux paths resulting in reduction of core losses and decreased phase resistance resulting in reduction of copper losses. Two-phase simultaneous excitation of the novel SRM can reduce torque ripple during commutation as compared with existing two-phase SRMs.

The invention provides a stator core and a manufacturing method thereof. The stator core comprises a lower end plate, an upper end plate, a plurality of laminated bodies and a plurality of connection members, wherein the laminated bodies are laminated between the lower end plate and the upper end plate; the connection members are penetrated through the laminated bodies and are connected with the lower end plate and the upper end plate; each laminated body comprises a plurality of laminated body units which are sequentially arranged in the circumferential direction and form a circumference; each laminated body unit comprises a yoke part and an inner tooth; the yoke part is an arc-shaped flat piece or plate; the inner tooth is a flat piece or plate and extends from the yoke part to the circle center of the yoke part; at least one of the yoke part and the inner tooth comprises a hole; adjacent laminated body units among the multiple laminated body units of each laminated body form joint seams; each connection member comprises a rod; the rod is penetrated through the hole of the laminated body unit; the lower end of the rod is fixed to the lower end plate, and the upper end of the rod is fixed to the upper end plate; the yoke parts of the multiple laminated bodies overlap along the direction of the rod; the inner teeth of the multiple laminated bodies overlap along the direction of the rod; and the multiple joint seams of the adjacent laminated bodies among the multiple laminated bodies do not overlap.

The invention discloses a preparation method of a spherical iron-based amorphous alloy powder; the spherical iron-based amorphous alloy powder is prepared by a gas atomization method, and the iron-based amorphous alloy with large amorphous forming capacity is used as a raw material; the atomic percentage composition of the iron-based amorphous alloy with large amorphous forming capacity is Fe<100-a-b-c-d-e>SiBP<c>Nb<d>Cu<e>, wherein a is 7-10, b is 7-11, c is 3-6, d is 0-3, and e is 0-2. The invention provides a method for preparing the spherical iron-based amorphous alloy powder by thegas atomization method to obtain the spherical alloy powder with a regular appearance, uniform particle size and complete amorphous state. The amorphous magnetic powder core prepared by taking the spherical iron-based amorphous alloy powder as the raw material has the advantages of uniform structure, high strength, high density and constant magnetic conductivity.