50results about How to "Reduce magnetic density" patented technology

The transformer includes: a magnetic core having two base-plates and four legs; a first conductive member as a first winding, having four through-holes through which the four legs pass, respectively; and one or more second conductive members as a second winding, each having four through-holes through which the four legs pass, respectively. The first and second windings are wound around the four legs. Closed magnetic paths are formed inside the magnetic core from the four legs to the two base-plates due to currents flowing through the first or the second winding. A couple of magnetic fluxes each generated inside each of a couple of legs arranged along one diagonal line are both directed in a first direction, while another couple of magnetic fluxes each generated inside each of another couple of legs arranged along another diagonal line are both directed in a second direction opposite to the first direction.

The invention provides a rotor of a high-speed Halbach-type permanent magnet motor. The rotor comprises a Halbach-type permanent magnet structure, a rotor shaft and a rotor sheath, wherein the Halbach-type permanent magnet structure comprises strip-shaped rectangular permanent magnets and strip-shaped arc permanent magnets; the external surfaces of the strip-shaped arc permanent magnets are arc-shaped; the strip-shaped rectangular permanent magnets and the strip-shaped arc permanent magnets are arranged in the peripheral direction of the rotor shaft at intervals; the rotor sheath is arranged outside the strip-shaped rectangular permanent magnets and the strip-shaped arc permanent magnets; the adjacent strip-shaped rectangular permanent magnets and strip-shaped arc permanent magnets are directly laminated; and a groove corresponding to the strip-shaped rectangular permanent magnets or the strip-shaped arc permanent magnets is formed in the rotor shaft or the rotor sheath. Due to the structural design of the rotor, the numerical value of the air-gap flux density of the rotor is improved; the sine degree of the waveform is enhanced; the power density of the motor is improved; the flux density of a rotating shaft yoke is reduced; the hollow rotating shaft provides a cooling channel for the rotor; and the dynamic response ability of the rotor is improved.

The invention discloses a single-phase permanent magnet brushless direct-current motor with auxiliary teeth and auxiliary windings. The single-phase permanent magnet brushless direct-current motor includes a stator and a permanent magnet rotor; the stator is provided with a plurality of stator main pole teeth and stator auxiliary pole teeth which are uniformly distributed along the circumference of the stator, wherein the stator main pole teeth and the stator auxiliary pole teeth are arranged at intervals; the total number of the tooth slots of the stator main pole teeth and stator auxiliary pole teeth is twice of the number of the poles of the permanent magnet rotor of the motor; the width of the stator main pole teeth is 1.55 to 2 times of the width of the stator auxiliary pole teeth; main tooth arc surfaces are formed at the roots of the stator main pole teeth; auxiliary tooth arc surfaces are formed at the roots of the stator auxiliary pole teeth; slot openings are formed between the main tooth arc surfaces of the stator main pole teeth and the auxiliary tooth arc surfaces of the stator auxiliary pole teeth; and the central line of each slot opening deviates from the central line of a corresponding stator auxiliary pole tooth by a certain angle. After the single-phase permanent magnet brushless direct-current motor of the invention is energized, a magnetomotive force F generated by stator current has voltage difference, and therefore, a dead point can be eliminated; and the starting instant magnetomotive force voltage difference can change with the magnitude of the controllable stator current, and therefore, the starting instant magnetomotive force voltage difference can be controlled, and the motor can be started smoothly without vibration.

The invention relates to a high-thrust tubular linear motor which comprises a stator shell, a stator and a rotor. The stator is coaxially and fixedly mounted in the stator shell, the rotor is coaxially and slidably mounted in an inner cavity of the stator, the stator comprises silicon steel sheets and windings which are arranged at intervals and fixedly mounted on the stator shell, the rotor comprises a rotor shaft, permanent magnets and magnetic conduction rings, and the permanent magnets and the magnetic conduction rings are arranged at intervals on the rotor shaft. The high-thrust tubular linear motor is characterized in that the rotor shaft is made of hollow soft magnetic materials, a copper tube is coaxially sleeved outside the rotor, the windings and the silicon steel sheets are fixedly mounted at intervals to form the stator, and the windings and the silicon steel sheets correspond to the permanent magnets and the magnetic conduction rings of the rotor. The high-thrust tubular linear motor is ingenious in design, reasonable in structure, large in starting force, fine in tightness and reliable in operation.

The invention discloses a disk type translation permanent magnetic stator type permanent magnetic vortex speed regulating device. The device comprises an input shaft and an output shaft in a concentric arrangement. The input shaft is orderly and concentrically provided with a permanent magnet stator and a magnetic rotor along an axial direction. The permanent magnet stator can translate along the axial direction of the input shaft. The output shaft is concentrically provided with a conductor rotor. The permanent magnet stator comprises an outer ring iron core, a radially magnetized permanent magnet ring and an inner ring iron core nested in order. The magnetic rotor comprises inner and outer ring permanent magnet poles which are in a staggered arrangement along a circumferential direction. Both the inner and outer ring permanent magnet poles are in an interval arrangement with corresponding iron poles, and the polarities of the inner and outer ring permanent magnet poles are the opposite. Compared with the prior art, the device of the invention has the advantages that through axially translating the permanent magnet stator, a speed adjustment function is realized, thus a speed regulating mechanism is simplified, the maintenance cost is reduced, the service life is prolonged, the structure is simple, the operation is convenient, the device is suitable for the occasions of different requirements, and the device has the functions of a permanent magnet coupling coupler, a soft starter and a permanent magnet speed regulator.

The invention provides a motor rotor, a reluctance motor and an electric vehicle. The motor rotor comprises a rotor core (1), and the rotor core (1) comprises a plurality of magnetic barrier groups. Each magnetic barrier group comprises at least two magnetic flux barriers (2); magnetic conduction channels (3) are formed between the adjacent magnetic flux barriers (2); permanent magnets (4) are arranged in the magnetic flux barriers (2); and, under the same pole, the pole arc field angle of the flux barrier (2) on the innermost side in the radial direction at the front edge of the D-axis rotation direction is psi; the pole arc opening angle of the radially innermost magnetic flux barrier (2) located at the rear edge of the D-axis rotation direction is psi1, the pole arc opening angle of theradially outermost magnetic flux barrier (2) located at the front edge of the D-axis rotation direction is xi, and the pole arc opening angle of the radially outermost magnetic flux barrier (2) located at the rear edge of the D-axis rotation direction is xi1, wherein psi> psi1, and xi> xi1. According to the motor rotor, the flux density of the leading-edge magnetic conduction channel can be reduced, local magnetic flux leakage is reduced, and the output torque of the motor is improved.

The invention discloses a quadrature-direct axis inductance variable permanent magnet brushless motor and a wide-area efficient optimization design method thereof. The method comprises the following steps of 1, obtaining a quadrature-direct axis inductance ratio through a magnetic circuit diagram of a multi-working-condition permanent magnet motor; 2, when an automobile is in different working conditions, enabling the motor to respectively meet the requirements for torque, speed regulation range, wide area and high efficiency under the corresponding working conditions through the change of thequadrature-direct axis inductance ratio; 3, setting the quadrature-direct axis inductance variable permanent magnet brushless motor; 4, preliminarily optimizing the sizes of a rotor magnetic barrierand an arc-shaped permanent magnet, and giving out an initial size and a constraint condition; and 5, comprehensively optimizing the sizes of the initial rotor magnetic barrier and the arc-shaped permanent magnet in the step 4 according to the requirements of different working conditions. According to the invention, the multi-target requirements under different working conditions that the motor obtains the higher comprehensive efficiency than a traditional permanent magnet brushless motor under the condition of simple structure and has higher torque density under a light-load condition, etc.,are satisfied.

Disclosed herein are an AC-DC converter in which an inductor of boost PFC and a flyback transformer are integrated in one and a method of preventing a magnetic density from being saturated by shifting a phase. The integrated magnetic circuit according to an exemplary embodiment of the present invention includes: a power factor correction stage (PFC-stage) including a boost inductor; and a flyback transformer including a primary winding and a secondary winding, wherein the boost inductor and the primary winding of the flyback transformer and the secondary winding of the flyback transformer are wound around a single core.

The invention discloses a compressor and an air conditioner. The compressor (300) comprises a driving motor, wherein the motor comprises a plurality of stacked stator punching sheets (1), the stator punching sheets are annular sheets, a plurality of stator grooves (2) are formed in annular faces of the stator punching sheets, penetrate through in the axial direction and are distributed in the peripheral direction at intervals, the stator grooves are rectangular grooves extending in the radial direction, and corners of the rectangular grooves are formed into round chamfers (21), wherein the short edge length D of each stator groove is 1.6mm to 4.2mm, the corner radius of each round chamfer is R, and a requirement that D/R is equal to 2 to 4 is met. According to the compressor, shapes of the rectangular stator grooves are designed in a targeted mode, the round chamfers of the corners are optimized and designed based on not changing approximate rectangular primary profiles, the minimum widths and the areas of stator teeth are increased, flux density of stator tooth shoes is reduced, and main flux conduction is improved. In addition, the design of the round chamfers can enable the round chamfers to be matched with technological corners of winding conductors in the grooves, the areas of the grooves can be utilized to the maximum degree, the motor can obtain a higher stator groove full rate, and accordingly efficiency of the motor is finally improved.

The invention provides an iron core and a motor. The iron core comprises a plurality of bodies, and the bodies are orderly connected end to end to be in a cylinder shape. Each body comprises a tooth part and a yoke part. The first end of the yoke part is arranged on the outer surface of the tooth part. The second end of the yoke part is stretched out towards one side of the tooth part, so that the body is in an L shape. A cooperated step is formed between the first end of the yoke part and the outer surface of the tooth part. The cooperated step is a first connecting part, and the second end of the yoke part is a second connecting part. The first connecting part and the second connecting part are connected cooperatively. The first connecting part and the second connecting part are arranged at the relatively thicker part of the yoke part so that the distance between the outer surface of the tooth part and the outer surface of the yoke part is increased. That is to say, the effective magnetic-flow area of the yoke part is increased so that flux density of an iron core is effectively reduced. Furthermore, the iron loss of the motor is lowered, and an overload capability of the motor is improved.

The invention relates to a novel stator and rotor structure of a switched reluctance motor, and belongs to the technical field of motor structures. A motor body comprises a stator, a winding and a rotor, and a motor structure with the stator arranged outside and the rotor arranged inside is adopted; the stator is composed of stator teeth and a stator yoke, the twelve stator teeth are arranged in the stator yoke at equal intervals in the circumferential direction, unequal-width thickening treatment is conducted on the two sides of the stator teeth, the inter-pole endpoint flux density can be reduced when the stator and the rotor are tangent in the operation process of the motor, and the overall temperature of the motor can be reduced. Winding connection is installed on the stator teeth in aconcentrated winding mode. The eight rotor teeth are distributed on the outer portion of the rotor yoke at equal intervals in the circumferential direction, the two sides of the tooth body are thickened in an unequal-width mode, meanwhile, the two sides of the tooth top are each provided with two symmetrical rectangular grooves, and therefore the radial air gap flux density can be increased, thetangential flux density can be reduced, the average torque of the motor can be increased, and torque pulsation can be reduced.

The invention discloses a noise-reducing transformer iron core structure and a manufacturing method thereof. The transformer iron core structure is formed by lapping a plurality of silicon steel sheets, and magneto-rheological glue is filled in gaps of adjacent silicon steel sheet laminations lapped at corners of the transformer iron core structure. According to the noise-reducing transformer ironcore structure, the magneto-rheological glue is filled in the lamination gaps of the adjacent silicon steel sheets, part of the magnetic induction lines can pass through the magneto-rheological gluein the lamination gaps due to the magnetic conductivity of the magneto-rheological glue, and compared with the situation that air exists in the lamination gaps, the magnetic lines of force are distributed in the lamination gaps more smoothly; therefore, the magnetic density of the leakage magnetic field around the lamination gap is reduced, the electromagnetic force between the silicon steel sheets is reduced, and the vibration noise between the silicon steel sheet laminations caused by the electromagnetic force is reduced. Meanwhile, due to the damping characteristic of the magneto-rheological glue, part of vibration energy is consumed, and therefore the effects of damping and reducing vibration noise are further achieved.

The invention discloses a desaturation superconducting switch flux linkage motor, and the motor comprises a rotor core, an air gap and a stator core which are sequentially distributed from inside to outside in the radial direction. The motor also comprises an armature winding which is placed in a stator core groove, an excitation winding which is placed in the middle of stator core teeth, magneticsteels which are placed at the top and the bottom of the stator core teeth respectively, and a cryostat which is used for wrapping the excitation winding, wherein the rotor core and the stator core are both made of ferromagnetic materials. According to the invention, the excitation winding and the armature winding are simultaneously placed on the stator, so the motor has only one physical air gapwithout a rotary winding, and the installation difficulty is reduced; meanwhile, the stator iron core and the rotor iron core are made of ferromagnetic materials, so the torque density of the motor can be effectively improved, and the superconducting consumption is reduced; and the modular cryostat is adopted, so the equivalent air gap flux density can be effectively reduced, and the torque density of the motor is further improved.

A stator punching plate used for an air conditioning fan motor relates to the technical field of AC asynchronous motor modification, and is characterized by comprising an annular punching plate body, wherein the middle part of the punching plate body is provided with a hollow inner round hole and an outer circle, a punching plate groove is arranged between the outer circle of the punching plate body and the hollow inner round hole, the punching plate groove is provided with a notch, a groove shoulder, a groove body and a groove top. The stator punching plate provided by the invention has the advantages that the structure is reasonable, the flux density distribution of iron cores is effectively improved, the raw material consumption of coils and the iron cores is reduced, the energy efficiency is high and the service life is long.