62results about How to "Large reluctance torque" patented technology

In a rotor 20 including a plurality of permanent magnet pieces 60 fixed in a plurality of magnet insertion slots 43 provided on the outer periphery of a rotor yoke 40, respectively, and the rotor yoke 40 having concaves 44 each provided between the permanent magnet pieces 60 adjacent to each other and protrusions 46 each provided in each the concaves 44 to protrude outwardly in the radial direction of the rotor yoke 40, between the sandwiching angle α formed by two sides connecting both outer ends A and A′ of each the concaves 44 to the center axis O of the rotor yoke 40 and the sandwiching angle β formed by two sides connecting both outer ends B and B′ of each the protrusions 46 to the center axis O of the rotor yoke 40, the following relationship is satisfied:

0.3<β/α<0.5

The invention relates to a double-layer V-shaped built-in permanent magnet motor rotor for an electric automobile. Multiple groups of permanent magnet slots which are radially arranged in an inner layer and an outer layer are uniformly arranged on the iron core of the rotor at intervals along the circumferential direction; one or more V-shaped magnetized stripy magnetic steel is embedded in each permanent magnet slot. By virtue of the optimization of structures such as the angle of polar arc of inner-layer V-shaped magnetic steel, the included angle of outer-layer V-shaped magnetic steel, the width proportion of the inner-layer magnetic steel to the outer-layer V-shaped magnetic steel and the included angle of the outer-layer forcipated permanent magnet slot and the outer-layer magnetic steel, the air-gap flux density waveform is more approximate to the sinusoidal distribution, the harmonic component is reduced, the air-gap field waveform of the motor is improved, the fundamental wave frequency of spline torque fluctuation is improved, the spline fundamental wave and the ultraharmonics torque amplitude value are reduced, the torque fluctuation caused by splines is reduced, and the synthesis torque fluctuation of the motor is greatly reduced; and meanwhile, the reluctance torque is obviously increased, the salient pole rate and flux weakening speed expanding capability of the motor are improved, a constant-power speed range wider than that of a surface-mounted permanent magnet motor can be obtained, and the driving requirement of electric and hybrid automobiles can be met.

A rotor includes a hollow cylindrical rotor core and permanent magnets embedded in the rotor core to form a plurality of magnetic poles on the radially outer periphery of the rotor core. The rotor core has a plurality of openings each of which extends in the axial direction of the rotor core so as to penetrate it. When viewed along the axial direction, each of the openings is symmetrically positioned with respect to the centerline of a corresponding one of the magnetic poles. For each of the openings, there are provided n reinforcing portions, where n is an integer not less than 2. The n reinforcing portions extend to connect a pair of radially-inner and radially-outer peripheral portions of the rotor core, thereby partitioning the opening into (n+1) parts. The n reinforcing portions are symmetrically arranged with respect to the centerline of the corresponding magnetic pole.

The invention provides a rotor and a permanent magnet motor. The rotor comprises a rotor core, the rotor core comprises a plurality of magnetic poles distributed on the circumferential direction, andeach magnetic pole comprises a first magnetic steel slot; the first magnetic steel slot adopts a center line as a symmetric axis, and the center line is distributed along the radial direction of the rotor core; the first magnetic steel slot comprises an outer wall surface, an inner wall surface and two side wall surfaces, wherein the outer wall surface and the inner wall surfaces are respectivelyplanes and are respectively vertical to the center line; the two side wall surfaces are respectively located at two ends of the first magnetic steel slot and are respectively connected with the outerwall surface and the inner wall surface; each side wall surface is provided with a peak-shaped projection that protrudes toward the outer circumferential surface of the rotor core, and the end part ofthe first magnetic steel slot is located on the inner side of the peak-shaped projection. According to the rotor provided by the invention, the peak-shaped projections are added on the two ends of the first magnetic steel slot to reduce the mechanical stress on the two ends of the first magnetic steel slot during the high-speed running of the rotor while reducing the magnetic flux leakage of therotor core.

The invention relates to a single salient pole permanent magnet motor scheme, which is characterized in that: a stator keeps a salient pole structure which is often used in a general magnetic resistance motor; permanent magnets are orderly and fully embedded in a rotor core along the circumferential direction of an air gap; a novel motor is formed by similarly changing the stator of the general permanent magnet motor into the salient pole type magnetic resistance stator; by adopting the magnetic biasing theory of a major loop and a tooth socket magnetic biasing type magnetic resistance motor and referring to the permanent magnet rotor structure of the general permanent magnet motor, the single salient pole permanent magnet motor scheme has the characteristics of advanced technique and good manufacturability; moreover, because the invention can make a stator trunking and a notch bigger, thereby facilitating to the winding of a winding machine on the one hand and being capable of adopting the multi-span winding of the magnetic biasing motor on the other hand; as a result, the number of turns of each trunking are reduced times, and the consumption of copper wires is greatly reduced.

The invention discloses a rotor of an electromotor. The rotor of the electromotor comprises a rotor core and multiple sets of permanent magnets, wherein the multiple sets of permanent magnets are buried in the rotor core. Each set of permanent magnets comprise multiple permanent magnet layers which are mutually arranged in the radial direction of the rotor core at intervals. The permanent magnet layer, closest to the surface of the outer circumference of the rotor core, of the multiple permanent magnet layers is a ferrite permanent magnet layer. The other permanent magnet layers of the multiple permanent magnet layers are rare earth neodymium ferrum boron permanent magnet layers. By the adoption of the rotor of the electromotor, the reluctance torque and the electromagnetic torque of the electromotor can be increased, efficiency of the electromotor is increased without increasing cost of the electromotor, and the problems of noise and vibration deterioration of the electromotor can not be caused. Besides, operating reliability of the electromotor can also be guaranteed, and the electromotor can also be stably operated under high frequency.

The invention discloses a built-in permanent magnet rotor structure of an axial flux motor. The built-in permanent magnet rotor structure comprises two rotor discs; each rotor disc comprises a rotor core with an annular cross section; each rotor core is formed by circumferentially winding a thin silicon steel sheet, and three layers of permanent magnet groups are uniformly embedded in the circumferential direction of each rotor core; each permanent magnet group comprises a first layer of U-shaped magnetism gathering structure permanent magnet combination, a second layer of U-shaped magnetism gathering structure permanent magnet combination and a third layer of linear structure permanent magnet which are sequentially arranged from the outer side of the rotor core to the circle center of the rotor core; the two rotor discs are installed on a rotating shaft in a manner that permanent magnet faces are opposite to each other, and a stator disc is arranged between the two rotor discs. According to the built-in permanent magnet rotor structure of the axial flux motor of the invention, the magnetism gathering capability of the permanent magnet rotor discs is stronger, and highly sinusoidal air gap flux density can be realized; the U-shaped permanent magnetcombinations and the linear permanent magnet combinations adopted, so that the salient pole effect of the motor can be improved, the reluctance torque is fully utilized, and the torque or power density of the motor is improved; and the silicon steel sheet is slotted and wound to form the rotor core, so that the machining is convenient and the structural strength is high.

The induction synchronous motor 2 is composed of a stator 4 having a stator winding 7 and a rotor 5 rotating inside the stator 4 , and a cage-type secondary conductor 5B is provided around a rotor yoke 5A constituting the rotor 5 . A permanent magnet 31 having two poles is embedded in the rotor yoke portion 5A. In the specified range near the electrical angle of 0° and 180°, the magnetomotive force of one pole of the rotor is kept below 10% of the peak value. In this way, the magnetomotive force generated by the rotor having the permanent magnets constituted by two poles can be concentrated to realize a large reluctance torque and high efficiency.

The invention discloses a variable branch modular permanent magnetic built-in outer rotor hub motor for an electric vehicle, and relates to the technical field of motors. A stator iron core is composed of Ns stator tooth modules and a stator yoke; each stator tooth module comprises a stator tooth and a winding coil wound on the stator tooth; a stator winding adopts a fractional slot concentrated winding structure to form m phases of windings; each phase is composed of k winding branches; the m phase of the windings with k winding branches are controlled by t m phases of DC-AC frequency converter; and a rotor consists of a rim and 2p rotor iron core modules. The hub motor has the advantages of high torque/power density, large reluctance torque, variable circuit control capability, capability of widening the speed regulation range, capability of realizing modular manufacturing and automatic production and the like.

The invention provides a synchronous reluctance motor rotor structure and a motor with the same. The synchronous reluctance motor rotor structure includes a rotor core which is provided with a plurality of slit slots. A filling slot is arranged at each of the two ends of each slit slot. Each filling slot has a first position near the d axis of the rotor core and a second position away from the d axis at the end near the edge of the rotor core. Each filling slot has a slot opening at the first position or at the second position. In the same pole of the rotor core, when one filling slot of two adjacent filling slots has a slot opening at the first position, the other filling slot has a slot opening at the second position. Thus, the q-axis flux can be further blocked without affecting the entry of the d-axis flux into the stator, the difference between the d-axis flux and the q-axis flux can be larger, greater reluctance torque can be generated, and the output and efficiency of the motorcan be increased. Moreover, the torque ripple of the motor is reduced, and the vibration noise of the motor is reduced.

The invention discloses a flat copper wire formed stator coil high-reluctance torque outer rotor type permanent magnet drive motor. The permanent magnet drive motor comprises a coupler shaft, whereinthe left and right sides of the coupler shaft are connected with a front end cover and a double-screw water channel ring respectively; a rear bearing is fixed onto the double-screw water channel ring;the double-screw water channel ring is matched with a water channel outer ring to form a double-screw water channel; the water channel outer ring is connected with an inner stator iron core; the coupler shaft is provided with an outer rotor magnet yoke fixed barrel; a self-buckle type outer rotor iron core is arranged on the inner surface of the outer rotor magnet yoke fixed barrel; and a plurality of magnetic steel is arranged on the self-buckle type outer rotor iron core in an inserted manner. By using the distribution of inverted V-shaped magnetic steel, the permanent magnet drive motor has the characteristic of high reluctance torque; a flat copper formed coil is used, a stator is an open slot, and the utilization rate of the slot is improved by 25% compared with that of a circular copper wire; a machine hand can be used for inserting winding; the efficiency of the motor can be improved by using more copper and few magnetic steel, the cost is reduced, the power density and torquedensity are improved, and the cost performance is higher; and the double-screw water channel has the advantages of low water resistance and high heat dissipation capacity.

The present invention provides a permanent magnet rotor capable of reducing a harmonic component of a waveform of a magnetic flux density distribution formed in an air gap of a rotary electric machine, and a rotary electric machine having such a permanent magnet rotor.

A rotary electric machine control system includes a control device that controls a rotary electric machine. When there is a current phase at which a reluctance torque is maximum between a first current phase (theta 1) of a first current vector (I1) on which current pulses have not been superimposed yet and a second current phase (theta 2) of a second current vector (I2) obtained by increasing a d-axis current and reducing a q-axis current, the control device sets an intermediate current vector (Im) having an intermediate phase (theta m) between the first and second current phases (theta 1, theta 2). The intermediate current vector (Im) is set so as to be larger than an imaginary current vector (Ima) at the intermediate phase (theta m) in the case where a vector locus is varied in a straight line from the first current vector (I1) to the second current vector (I2). The current pulses are generated by changing the current vector in order of I1, Im and I2 and returning the current vector in order of Im and I1.

The invention belongs to the field of motor design, and particularly relates to an armature winding design technology of a permanent magnet motor. Each phase of the windings provided by the inventionrealizes flexible armature magnetic field pole number change through the mutual offset effect of the coils wound on each tooth. According to the scheme, each coil is wound on a stator tooth, each phase winding is formed by connecting a plurality of coils wound on one tooth in series and in parallel according to a certain connection rule, and no matter how many rotor magnetic poles are, the windingcan always keep a single-tooth-winding centralized winding with the pitch of 1.