37results about How to "Improve air gap flux density waveform" patented technology

The invention relates to a winding misaligned hub motor device, comprising a stator core and a rotor core disposed on the periphery of the stator core, wherein the stator core comprises a plurality ofmodular stator cores, each modular stator core comprises a middle tooth and two side teeth respectively located on two sides of the middle tooth, the plurality of modular stator cores are connected to each other along the circumference to form a plurality of teeth arranged along the circumference, the stator core is provided with three-phase dislocation windings, the winding mode of the three-phase dislocation windings is that the adjacent three modular stator cores are grouped, the windings on one or the two side teeth of the same position in each modular stator core in each group are woundby a plurality of layers, the side teeth having a plurality of layers of wound windings are wound with current phase winding and the phase windings on adjacent modular stator cores, and the other teeth are provided with single phase windings. The invention is capable of improving the electromagnetic characteristics of the motor output by weakening the even harmonics induced by the continuous polemagnetic imbalance in the back electromotive force and reducing the torque ripple.

The invention relates to a magnetic pole structure of a permanent magnet synchronous direct-driven motor. The magnetic poles are embedded in the circumference of the surface of a rotor in a manner that an N pole and an S pole are alternated, and are opposite to a stator; and a layer of air gap is arranged between the stator and the rotor. The stator comprises an iron core and a winding; and the rotor is of a hollow shaft structure or a solid shaft structure. The magnetic poles of the rotor adopt the magnetic poles with unequal thicknesses, and are uniformly distributed around the surface of the rotor of the motor, so that a no-load magnetic flux density waveform of the air gap is approximate to a sine wave. According to the magnetic pole, a design idea of an inverse problem of an electromagnetic field is adopted, the centers of the magnetic poles with equal thickness are used as a symmetrical axial line, and the thicknesses on two ends of the magnetic poles are gradually reduced, so that an initial scheme of the magnetic poles with unequal thicknesses is obtained. Electromagnetic field software simulation is utilized to obtain the magnetic flux density waveform of the air gap, a fundamental wave and a harmonic component are analyzed, partial size of each magnetic pole is adjusted according to design requirements, and multiple replication is carried out until a design goal is optimized. Due to the adoption of the magnetic pole structure, the vibration and the noise of the permanent magnet synchronous direct-driven motor can be reduced.

The invention, which belongs to the technical field of motor fittings, particularly relates to a rotor structure capable of improving a gap flux density waveform of a two-pole self-starting permanent-magnet motor. The rotor structure comprises a rotor iron core having a plurality of mouse case slots and permanent magnets installed in permanent-magnet slots. The permanent magnets under two poles employ three-segment type inverted-U-shaped magnetic circuit structures and each of the permanent magnets includes an intermediate-segment permanent magnet and two segments of side permanent magnets; air slots are formed between the two adjacent segments of permanent magnets; the three segments of permanent magnets are arranged in a left-right symmetric mode relative to the central lines of the intermediate-segment permanent magnets; and end portions, far away from mounting slots of the intermediate-segment permanent magnets, of mounting slots of the two segments of side permanent magnets are non-magnetic-conductive material filling parts. The whole rotor structure is in a left-right-symmetric mode relative to the central lines of the intermediate-segment permanent magnets and the rotor is installed at a rotating shaft. Therefore, the gap flux density waveform of the motor can be optimized. On the basis of sinusoidal processing of the gap flux density waveform of the motor, the harmonic contents in the air-gap field and the stator winding can be reduced, the counter-electromotive-force waveform can be optimized, the motor efficiency can be improved; and the motor torque pulsation can be reduced.

The invention relates to a permanent magnet synchronous motor rotor structure with an arched permanent magnet. One edge of arched magnetic steel of the permanent magnet synchronous motor rotor structure is in an arc shape, and the other edge of the arched magnetic steel of the permanent magnet synchronous motor rotor structure is in a straight-line shape; an opening of the arc shape faces the center of a rotor core, and air-gap fields and winding back electromotive force potential waveforms can be obviously improved. Meanwhile, magnet separating bridges are arranged on the two edges of each magnetic pole of the rotor structure respectively, and the leakage magnetic flux can be reduced through the arrangement of the magnet separating bridges. Gap flux density waveforms of a permanent magnet synchronous motor are essentially improved, the back electromotive force potential waveforms of the permanent magnet synchronous motor are accordingly improved, eddy-current losses are reduced, torque pulsations are reduced, vibration and noise of the motor are reduced, the temperature rise of the motor is decreased, the efficiency of the motor is improved, the operation stability of the motor is improved, and the overall performance of the motor is improved.

The radial permanent magnet motor without iron core comprises a shell on base, a rotation shaft arranged rotor and stator radially along circular, a bearing to fix the motor rotation shaft on center of shell; wherein, the rotor comprises a frame on shaft and permanent magnet around the frame; the stator comprises a stator yoke with stator coil and stator winding around permanent magnet. His invention has simple structure, high efficiency, little vibration, and no static friction torque; it eliminates iron consumption at root, and decreases greatly the effect of harmonic wave.

The invention discloses a frame system for a control moment gyroscope. The frame system can be used as a posture control executing mechanism of large spacecraft like a large satellite and a space station and is composed of a rotary transformer end mechanical bearing, a conducting slide ring, a rotary transformer, a rotary transformer base, a rotary variable shaft, a harmonic shaft, a frame, a motor base, a harmonic reducer, a frame motor stator assembly, a frame motor rotor assembly, a motor end mechanical bearing and the like. A frame core shaft is driven by a frame moment motor to drive a connected gyroscope rotor to rotate to output gyroscope moment, the rotary transformer is in charge of outputting an angular position signal of the frame core shaft to be fed back to a control system ofa moment motor, therefore the moment motor is controlled, an iron core fractional slot structure is adopted by the moment motor to reduce flux leakage, after the moment output by the motor is amplified by the harmonic reducer, the moment is transferred to the gyroscope rotor, and therefore, gyroscope torque is output. The frame system has the advantages that the layout is compact, the size is small, the weight is low, the system noise is small, and the control precision and torque output efficiency of the frame system are high.