15 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.

The invention discloses a motor and a household appliance, and relates to the technical field of motors, the motor comprises a rotor assembly and a stator assembly, the number of winding grooves of a stator iron core of the stator assembly is 18, the number of permanent magnets of the rotor assembly is 14, the relation among motor copper loss, iron loss and a winding coefficient can be optimized, and the efficiency of the motor is improved. And the winding coefficient is improved while the copper loss and the iron loss are reduced, so that the efficiency of the motor is improved. The value of (So / Sor) * (Di / Dout) is limited between 0 and 0.9, so that the size of the motor is proper, copper loss and iron loss are further reduced, magnetic flux leakage is reduced, magnetic flux is improved, the relation between the magnetic flux emission amount and the magnetic flux receiving area is balanced, the efficiency of the motor is further improved, the performance of the motor is improved, and the motor is in a better working state.

The invention discloses a magnetic flux reverse permanent magnet motor, and belongs to the technical field of motors. The magnetic flux reverse permanent magnet motor comprises a rotor, a stator, an armature winding and a non-magnetic rotating shaft, excitation units are arranged on the inner surface of the stator in the circumferential direction; each excitation unit comprises a plurality of permanent magnets, each excitation unit is provided with a plurality of magnetic poles with different widths, and a plurality of permanent magnet excitation magnetomotive force working harmonic waves can be generated; on the basis, the stator comprises stator armature teeth and stator auxiliary teeth which are arranged along the circumferential direction of the stator in a staggered manner, and the tooth surface width of the stator armature teeth is greater than that of the stator auxiliary teeth, so that the span of an armature winding is increased, and the winding coefficient of each harmonic of armature magnetomotive force is changed; and low-order non-working harmonic waves of the armature can be converted into working harmonic waves, so that the torque density is greatly improved.

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 motor and a household appliance, and relates to the technical field of motors, the motor comprises a rotor assembly and a stator assembly, the number of winding grooves of a stator iron core of the stator assembly is 18, the number of permanent magnets of the rotor assembly is 14, the relation among motor copper loss, iron loss and a winding coefficient can be optimized, and the efficiency of the motor is improved. And the winding coefficient is improved while the copper loss and the iron loss are reduced, so that the efficiency of the motor is improved. Under the condition of 18 slots and 14 poles, the value of (Wr / Wt0) * (Di / Dout) is limited between 3 / 8 and 2, so that the size of the motor is proper, the copper loss, the iron loss, the emitting width of magnetic flux and the receiving width of the magnetic flux are further reduced, the utilization rate of a magnetic circuit is improved, the cogging torque and the torque pulsation of the motor are reduced, and the efficiency of the motor is improved.

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 invention relates to a tooth tip span angle regulation and control design method and device for a modular stator centralized winding permanent magnet synchronous motor. The method comprises the steps of obtaining an actual notch span angle of the motor and a target winding factor expected to be reached by the motor; determining a notch offset based on the target winding factor and the notch span angle by using a motor winding function corresponding to the motor; the notch offset represents the offset predicted by the notch span angle when the motor reaches a target winding factor; the motor winding function represents a function relationship between a notch span angle of the stator core and a winding factor; and determining the target design size of the tooth tip of the stator tooth in the motor according to the notch offset, the original design size of the tooth tip of the stator tooth in the motor, the total number of winding grooves in the motor and the number of pole pairs of the motor. Therefore, the modularized stator centralized winding permanent magnet synchronous motor adopting the tooth tip offset design can be effectively applied to a high-rotating-speed scene under the design requirements of few phase numbers and few pole pairs.

The invention discloses a winding structure of a flat wire motor, and belongs to the technical field of motors. The winding structure comprises a stator iron core and a three-phase winding, and the three-phase winding is installed in a stator groove of the stator iron core and is divided into multiple layers. Each phase is provided with a plurality of parallel branches, flat wires in slots under each pole are divided into multiple classes according to phase and number, and the flat wires comprise first winding slots which all belong to the same phase, second winding slots of which the flat wires of the phase are more than those of other phases, and third winding slots of which the flat wires of the phase are less than those of other phases. The winding adopts a short-distance design, and a welding end is of a crown-shaped wire outlet structure. According to the invention, by optimizing the distribution of the conductors in the slot, the short-distance design and the symmetrical branch layout, the fundamental wave winding coefficient is synergistically improved, the harmonic wave is effectively suppressed, the noise, vibration and sound vibration roughness performance of the motor is remarkably improved, the insulation reliability is enhanced, the manufacturing process is simplified, the circulation is avoided, and the service life of the motor is prolonged. And the power density, the efficiency and the reliability of the motor are integrally improved.

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 invention discloses a stator and winding design method for reducing short-circuit current and inter-phase mutual inductance of a permanent magnet synchronous generator, a mixed slot type stator structure is provided based on a stator slot offset technology, a stator is equally divided into six modules in space, coils under the modules belong to the same phase, and the coils are connected with the stator through a winding. Each module is composed of two large stator slots, two small stator slots, three armature teeth and an isolation tooth, and the isolation tooth is not wound and mainly plays roles in reducing mutual inductance and improving interphase isolation; the slot pitch of the mixed slot type stator structure is equal to the rotor pole pitch, and the motor torque is improved by increasing the fundamental wave winding coefficient. The stator slot offset is combined with the isolation teeth, so that the short-circuit current of the permanent magnet generator can be effectively suppressed, the inter-phase mutual inductance is greatly reduced, and the reliability is improved.

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.