9 results about "Winding factor" patented technology

The invention relates to the technical field of motors, and discloses a flywheel energy storage motor stator-rotor structure and an optimization method thereof, and the flywheel energy storage motor stator-rotor structure comprises a stator body, a rotor body and a motor air gap. The method further comprises the following steps: step 1, designing an air-gap magnetic field: by adjusting the shape and the arrangement mode of a motor air gap or a permanent magnet, enabling a flux density waveform to be close to a sine wave when the motor air gap is in a no-load state so as to suppress harmonic waves; step 2, slot-pole matching design: a stator winding adopts a fractional slot concentrated winding form, a high fundamental wave winding factor is obtained by adjusting the matching relation between stator slots and permanent magnet pole numbers, and specific subharmonics are suppressed from a winding magnetomotive force level; 3, magnetic circuit and structure design: magnetic circuit saturation is suppressed by adjusting the geometric dimensions of stator teeth and a yoke part; according to the invention, the comprehensive performance targets of high torque density, high efficiency and low torque pulsation of the flywheel motor can be realized at the same time.

This application discloses a method for calculating and optimizing the winding coefficient of a coreless motor, comprising: constructing a radial magnetic induction intensity model of the permanent magnet considering three-dimensional effects / axial magnetic field attenuation based on the geometric and material parameters of the permanent magnet; calculating the axial efficiency factor of the winding based on the winding geometric parameters and the radial magnetic induction intensity model of the permanent magnet, the axial efficiency factor including the straight-side axial efficiency factor and the inclined-side axial efficiency factor; modifying the traditional pitch factor formula based on the axial efficiency factor to obtain the pitch factor considering the three-dimensional effect of the magnetic field of the coreless motor, and calculating the total winding coefficient of the winding based on the pitch factor. The accuracy of the three-dimensional distribution of magnetic induction intensity and the winding coefficient of the coreless motor calculated by this method is close to the three-dimensional finite element simulation results, while reducing the calculation time from several hours to milliseconds, achieving high precision and high efficiency.

The application provides a motor and an electrical device, wherein the motor comprises a first stator, a first stator yoke and a first stator tooth, the first stator tooth is arranged on the first stator yoke; a rotor, which is sleeved outside the first stator; a second stator, which is sleeved outside the rotor, the second stator comprises a second stator yoke and a second stator tooth, the second stator tooth is arranged on the second stator yoke; and a winding, which is arranged on the first stator yoke and / or the second stator yoke. The winding is arranged on the first stator yoke or the second stator yoke in the form of yoke winding, or the winding is arranged on both the first stator yoke and the second stator yoke, so that the end part of the winding is shortened, the contradiction between the too long end part of the winding and the high winding factor of the motor is effectively balanced, the winding is arranged on the first stator yoke and / or the second stator yoke, which is obviously simpler, so that the production difficulty of the motor is reduced and the production efficiency is improved.

This invention discloses a stator slotted type dual permanent magnet vernier motor and its design method. The motor structure includes a stator and a rotor. The stator includes a stator core, windings, and stator permanent magnets, while the rotor includes a rotor core and rotor permanent magnets. Each stator tooth is split into two smaller teeth for modulation, and the stator permanent magnets are respectively embedded in each split tooth. The rotor adopts a salient pole structure for modulation, and the rotor permanent magnets are respectively embedded in the rotor salient pole teeth. Air slots are sequentially spaced in the stator teeth, penetrating the stator core. Three-phase single-layer fractional-slot concentrated windings are wound on each slotted stator tooth. The design method of this invention starts from the harmonic contribution components of the original structure to torque. By directionally increasing the equivalent winding factor of the main operating wave and decreasing the equivalent winding factor of the lower harmonics through slotting within the stator phases, the amplitude of the main operating wave of the armature magnetic field is increased, while the non-operating waves such as lower harmonics are reduced.

The invention provides a flat wire motor, a power assembly and an electric vehicle, a motor stator of the flat wire motor comprises a plurality of winding slots, N flat wires are sequentially arranged in each winding slot in a layered manner along the radial direction of the motor, N is an odd number greater than or equal to 5, the N flat wires comprise a first flat wire, a second flat wire and a third flat wire which are sequentially and adjacently arranged, the distance between the first flat wire and the axis of the motor stator in the radial direction of the motor is larger than the distance between any one of the N flat wires except the first flat wire and the axis of the motor stator. The number of the winding grooves spaced between at least one first flat wire and the first flat wire connected with the first flat wire is different from the number of the winding grooves spaced between the second flat wire and the third flat wire connected with the second flat wire. Therefore, the flat wires in the winding grooves can be connected in a short-distance winding mode, the fundamental wave winding coefficient can be considered, the harmonic wave winding coefficient is weakened, and the NVH performance of the flat wire motor is improved.

The invention discloses a polar slot matching optimization method and system for a bidirectional modulation permanent magnet vernier motor, belongs to the technical field of permanent magnet motor design, and aims to solve the problems of low output torque, high harmonic content and large torque pulsation caused by unreasonable polar slot matching of the bidirectional modulation permanent magnet vernier motor. The method comprises the following steps: establishing a complete magnetic field analysis model containing air gap ratio magnetic conductance, permanent magnet magnetic potential, armature magnetic potential and air gap flux density; harmonic components of the permanent magnetic field and the armature magnetic field are analyzed, static harmonic magnetic fields generated by the stator permanent magnets are identified, and the number of pole pairs of at least one static harmonic magnetic field in the armature magnetic field is equal to that of pole pairs of the stator permanent magnets; establishing a constraint condition, wherein a pole slot matching selection principle satisfies one of six equations; and screening and verifying the optimal scheme by combining the engineering constraint that the winding factor is not less than 0.9.

The invention discloses a design method for a combined winding structure of a brushless dual-rotor motor, and belongs to the technical field of power generation, power transformation or power distribution. The method comprises the following steps: determining a ratio range of outer rotor magnetic conductive blocks to inner rotor pole pairs according to inner and outer rotor rated torques; according to the determined ratio range, based on concentrated winding design of the stator winding, and considering a high self-winding factor and a low mutual winding factor, exhausting all pole slot cooperation; establishing a finite element model, performing FFT analysis on the back electromotive forces of the two sets of windings, and screening out pole-slot matching meeting the decoupling control requirement; rearranging a winding sequence for the screened pole slot matching, and selecting the pole slot matching with the highest winding merging rate; the coils are combined and wound on the same tooth and have the same electrifying direction and the same number of turns; a combined winding structure is generated through series-parallel connection. According to the scheme, mutual decoupling and independent control between the windings can be achieved, the structure is simpler, and smaller copper loss can be generated under the same current injection level.

The application discloses a design method of a combined winding structure of a brushless double-rotor motor, and belongs to the technical field of power generation, power transformation or power distribution. The method determines the range of the ratio of the outer-rotor magnetic conductive block to the inner-rotor pole pair number according to the rated torque of the inner and outer rotors; based on the determined ratio range, the concentrated winding design of the stator winding is carried out, and all pole-slot combinations are exhausted by considering the high self-winding factor and the low mutual-winding factor; a finite element model is established, and the back electromotive force of the two sets of windings is analyzed by FFT; the pole-slot combination meeting the decoupling control requirement is screened out; the winding sequence of the screened pole-slot combination is rearranged, and the pole-slot combination with the highest winding combination rate is selected; the combined winding is combined in the same tooth, the coils with the same current direction and the same number of turns; and a combined winding structure is generated through series-parallel connection. The scheme can not only realize the mutual decoupling and separate control of the windings, but also has a simpler structure and generates smaller copper loss under the same current injection level.

The utility model discloses a 6-stage 54-slot flat wire winding, a motor stator and a flat wire motor, comprising a three-phase winding, and the three-phase winding comprises a single-phase winding; the slot number q of each stage and each phase of the three-phase winding is equal to 5; the single-phase windings are sequentially arranged in the stator slots at equal intervals along the circumferential direction, the proportion of the single-phase windings which are intensively arranged in the stator slots in each magnetic pole is sequentially increased to 100% and then sequentially decreased, and the initial positions of the single-phase windings in each magnetic pole are located at the slot bottoms or slot openings of the stator slots. The number of slots occupied by each stage and each phase is increased, the current distribution condition is improved, potential phase difference distribution is more uniform, the offset effect of higher harmonics during superposition is enhanced, and the higher harmonic winding coefficient, especially the fifth and seventh harmonic winding coefficients, is reduced under the condition that the fundamental wave winding coefficient is ensured; and secondly, the arrangement mode of the single-phase winding in the stator slot enables each stage and each phase to be regularly distributed in the stator slot, and the current distribution condition in the winding is optimized.