48results about How to "Raise the saliency ratio" patented technology

The invention discloses a transverse laminated synchronous reluctance motor with auxiliary permanent magnets. The transverse laminated synchronous reluctance motor with the auxiliary permanent magnets comprises a stator core, stator windings, a rotor core assembly, a rotating shaft, a bearing used for supporting the rotating shaft, a front end cover, a rear end cover and a machine shell. The rotor core assembly comprises the rotor core and a plurality of block-shaped permanent magnets, wherein the rotor core and the plurality of block-shaped permanent magnets are sleeved on the rotating shaft. The rotor core is formed by transversely laminating a plurality of single-shaped complete steel sheets along the rotating shaft. The rotor core is provided with a plurality of layers of arc grooves suitable for insertion of the blocked-shaped permanent magnets. The block-shaped permanent magnets are arranged in the arc grooves. The polarities of the permanent magnets in the layers of arch grooves of the same polar are the same and form a magnetic pole group. The polarities of magnetic pole sets of two adjacent poles are opposite. According to the synchronous reluctance motor, the auxiliary block-shaped permanent magnets are arranged in the arc grooves of the rotor core, and therefore power factors of the motor are improved, and constant power speed adjustable ranges of the motor are widened; and due to the fact that the rotor core is formed by transversely laminating the plurality of single-shaped complete silicon steel sheets, the motor can have good mechanical strength.

A synchronous reluctance motor includes: a rotor shaft; a rotor core fixed to the rotor shaft and on which a plurality of flux barriers are formed; a stator core on which a plurality of protruding stator teeth are formed; and multiphase armature windings of a plurality of poles wound around the plurality of stator teeth. The flux barriers include a plurality of first flux barriers formed to be spaced out in the circumferential direction from each other and extend in a radial direction, and a plurality of second flux barriers formed in each of circumferential angular regions sandwiched between the first flux barriers to form a curved surface convex toward the center of the rotation-axis and to spread and be spaced out in the circumferential direction from each other.

The invention discloses a sensorless controller of a bearingless synchronous reluctance motor and a method for controlling the sensorless controller. The sensorless controller consists of a current sampling and conversion unit, a least square support vector machine prediction model, a linear closed-loop controller, and two expanded current hysteresis pulse width modulation (PWM) inverters which are connected in parallel, wherein the current sampling and conversion unit acquires an output current and generates an input current of the least square support vector machine prediction model; the least square support vector machine prediction model respectively compares prediction radial displacement and a rotary speed, which are output, with given reference values to obtain difference values which serve as input signals of the linear closed-loop controller; and control current components of a suspension force winding and a torque winding which are generated by the linear closed-loop controller are input into the two current hysteresis PWM inverters to respectively generate the input currents of a system. By the invention, the bearingless synchronous reluctance motor can be steadily suspended in a sensorless mode in a full-speed range, and high anti-interference performance and high robustness are realized.

The invention discloses a synchronous reluctance motor rotor applied to a hybrid power system. The synchronous reluctance motor rotor applied to the hybrid power system comprises a rotor core and magnetic steel. The rotor core is formed by rotor punching sheets in an overlying mode. Each rotor punching sheet comprises a plurality of symmetrical magnetic poles, and the polarities of every two adjacent magnetic poles are opposite. Each magnetic pole comprises a plurality of layers of grids, wherein the magnetic steel is placed in the grids. Grooves are formed in the excircle of the rotor in the straight axes in the direction facing the circle center of the rotor.

The invention relates to a novel rotor lamination structure which has the advantages of a surface type rotor magnetic path structure and a built-in type rotor magnetic path structure. The outer surface of the rotor lamination structure has eight uniformly distributed cambered surface structures; corresponding positions on the middle parts of magnetic steel slots are the highest points of cambered surfaces; and eight bulges are uniformly distributed at positions corresponding to gaps in the middle of every two adjacent magnetic steel slots. The novel rotor lamination structure can easily produce a back electromotive force with sine waveform, has high mechanical strength and a larger saliency ratio and is convenient for flux weakening speed expansion.

The application provides a rotor structure of a permanent magnet synchronous motor applied to an electric vehicle. The rotor structure uses a built-in double-layer V-shaped magnetic pole structure. Amagnetic pole included angle of an inner-layer V-shaped magnetic pole structure is larger than a magnetic pole included angle of an outer-layer V-shaped magnetic pole structure, and a difference valueof the two parts is within [0 degrees, 50 degrees]. Width of a permanent magnet slot of the inner-layer magnetic pole structure is 1.5-2 times of width of a permanent magnet slot of the outer-layer magnetic pole structure. The application also provides the permanent magnet synchronous motor including the rotor structure, a power assembly including the permanent magnet synchronous motor, and the electric vehicle including the power assembly. Through reasonable numerical matching on the magnetic pole included angle of the inner and outer magnetic pole structures and the width of the permanent magnet slots, the scheme of the application can increase a saliency ratio of the permanent magnet synchronous motor, reduce the amount of permanent magnet use, and reduce cost.

The invention discloses a series hybrid permanent magnet variable flux motor. The series hybrid permanent magnet variable flux motor comprises a stator (100), an armature winding (200) wound on the stator (100), and a rotor core (300), wherein three permanent magnets which are not in direct contact and placed separately are arranged under each pole of the rotor core (300), the second permanent magnet (302) is placed on the outer sides in a linear shape, the two first permanent magnets (301) are placed on the inner side in a ''V'' shape, the second permanent magnet (302) is a high-coercivity permanent magnet or a low-coercivity permanent magnet, and the first permanent magnets (301) are high-coercivity permanent magnets or low-coercivity permanent magnets. According to the series hybrid permanent magnet variable flux motor, the low-coercivity permanent magnets and the high-coercivity permanent magnets adopt special placement positions and manners, such that the motor is of a magnetic circuit series structure, the high-coercivity permanent magnets are used for increasing magnetism of the low-coercivity permanent magnets, the working points and magnetization degrees of the low-coercivity permanent magnets are increased, the torque output capability is improved, and the magnetizing current of the motor is reduced.

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 invention discloses a mixing torque motor which includes stators and rotors positioned on the peripheries of the stators, wherein the rotors include barrel-shaped rotor iron cores; a plurality of permanent magnets are distributed on the inner walls of the rotor iron cores at intervals; the polarities of two adjacent permanent magnets are opposite, and permeability magnetic materials are arranged between the two adjacent permanent magnets. The invention further discloses a traction machine adopting the mixing torque motor. Compared with a conventional gearless permanent magnet synchronous traction machine, the traction machine provided by the invention reduces magnetic steel using amount and lowers the motor cost, so that the complete machine cost of the traction machine is reduced and the structure is compact and the size is small; operational maximum speed of the traction machine is further improved through flux weakening speed expansion due to structural salient poles added on the rotors; the degree of difficulty of detecting positions of rotor magnetic poles through adopting the position sensor free control algorithm is reduced and greater possibility of de-encoding of the permanent magnet traction machine is provided due to the existence of the structural salient poles.

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 rotor punching sheet, a rotor core, a motor rotor, an assembling method and a motor, the rotor punching sheet comprises a punching sheet body, the punching sheet body is provided with a plurality of magnetic pole forming areas corresponding to the magnetic poles of the motor rotor, and the punching sheet body in each magnetic pole forming area is provided with a first magnetic barrier groove; the first magnetic barrier grooves are symmetrical about the d axis in the corresponding magnetic pole forming area and form a first field angle structure facing the peripheral side of the punching sheet body, the bottom of each first magnetic barrier groove is provided with a first magnetic isolation bridge located on the d axis, and each first magnetic barrier groove comprises two first laterally-extending magnetic barrier grooves symmetrical about the d axis. each first laterally-extending magnetic barrier groove comprises a first magnetic steel groove and a first air groove located on the radial outer side of the first magnetic steel groove, and the first air groove is communicated with the peripheral wall of the punching sheet body. According to the invention, because the outer circle of the rotor punching sheet is not provided with a magnetic isolation bridge, the magnetic leakage at the magnetic isolation bridge can be reduced, the salient pole ratio of the rotor is improved, and the torque output capability of the motor is enhanced.

A rotor of an embodiment has a shaft and a rotor core fixed to the shaft. Multiple flux barriers are formed on the rotor core. Multiple bridge parts are formed on each of the flux barriers, and one ormultiple barrier regions having a lower magnetic permeability than that of portions other than the flux barrier are formed between the multiple bridge parts. A permanent magnet is disposed in at least one of the barrier regions. The magnetization direction of the permanent magnet is aligned with a direction intersecting the longitudinal direction of the flux barrier. In addition, a value of ([mu]0*SMxBr)/([mu]re*tFB*wB) is in a range of 1.2 to 3.0 inclusive.

The present invention relates to a permanent magnet motor rotor with a high saliency ratio. The permanent magnet motor rotor with a high saliency ratio comprises a rotor sheet and permanent magnets; radial slot sets configured to put the permanent magnets and matching with the number of poles are uniformly arranged at a circumference direction of the rotor sheet, the radial slot sets are two or more than two layers of permanent magnet slots arranged on the rotor sheet along a radial direction, the permanent magnet slots are distributed in a line-shaped mode or a W-shaped mode along the circumference of the rotor sheet, the permanent magnets are arranged in the permanent magnet slots, and two ends of each permanent magnet slot are respectively provided with non-magnetic slots. The radial slot sets configured to put the permanent magnets and matching with the number of poles are uniformly arranged at the circumference direction of the rotor sheet, and a plurality of permanent magnets arearranged at each pole, so that a saliency ratio is greatly improved, and processing is very simple. The present invention further relates to a motor comprising the permanent magnet motor rotor with ahigh saliency ratio.

The invention discloses a stator and rotor structure of a high-power-density reluctance motor. The structure comprises a stator and a rotor, the number of stator slots and the number of rotor magneticbridges meet the formula (1): Nr = Ns-4k (1), Ns is the number of stator slots corresponding to each pair of poles, Nr is the number of rotor magnetic bridges corresponding to each pair of poles, K is a positive integer, and the number of rotor magnetic bridges corresponding to each layer of rotor magnetic barriers is 2; the number of layers of the rotor magnetic barriers is Nr/2, and then rounding is carried out; the opening angle alpha of the outermost layer magnetic bridge of the rotor meets the formula (2), wherein p is the number of pole pairs. According to the invention, the leakage flux of the motor can be reduced, the salient pole ratio of the motor is improved, the torque output capability of the motor is improved, and the torque ripple of the motor can be reduced.