38results about How to "Increased air gap flux density" patented technology

The invention relates to a permanent magnet drive motor for a solar tracking system, which comprises an enclosure, a stator and a rotor which are arranged in the enclosure, wherein, the stator comprises a stator core and a stator winding which are fixed on an inner wall of the enclosure, and the stator core comprises a stator magnetic yoke, a stator slot and stator teeth; the rotor comprises a rotating shaft and a rotor core, and a permanent magnet slot is uniformly arranged along the periphery of the rotor core; the permanent magnet slot is internally inlaid with radial magnetized rectangular strip magnetic steel, the radial magnetized rectangular strip magnetic steel and a pole piece form a permanent magnet pole, and an excircle of a rotor pole piece is in a concentric or excentric arc curved surface shape to form uniformly or non-uniformly symmetrical air gap; semi-circle grooves are arranged on two ends of the permanent magnet slot in which one of two pieces of adjacent radial magnetized rectangular strip magnetic steel is arranged; and rectangular supporting bars are radially inserted in the permanent magnet slot in which the V-shaped radial magnetized rectangular strip magnetic steel is arranged. The permanent magnet drive motor has the characteristics of high efficiency, high output power, high reliability, low moment fluctuation and the like.

The invention relates to a novel synchronous electric motor and an electric motor control system thereof, and realizes the special advantages of 'one electric motor and three states' and 'one state and multiple characteristics'. The invention is characterized in that on the basis of the existing permanent magnetic synchronous electric motor used for an electric automobile and a controller thereof, an exciting winding is added on a rotor, and the current of the exciting winding is controlled by an electric motor controller to change the intensity of a magnetic field of the electric motor so as to change the external characteristics of the electric motor and achieve the target of 'one electric motor and multiple characteristics'. The characteristic overcomes the defects of insufficient torque and poor dynamic property when the existing permanent magnetic synchronous electric motor used for the electric automobile is used for climbing, simultaneously solves the problem of insufficient electric motor speed when the electric automobile is in cruise control or high-speed running, and completely meets the requirements on road conditions of the electric motor used for the electric automobile. An advanced topology and control algorithm is adopted for the electric motor controller adaptive to the invention, and the electric motor is controlled more efficiently, and has better dynamic property and a longer running range.

The invention relates to a momentum wheel based on a disc type structure. The momentum wheel comprises a lower layer stator and an upper layer stator, wherein the upper layer stator and the lower layer stator are fixed in parallel; an air gap is formed between the upper layer stator and the lower layer stator; a rotor is arranged in the air gap; a mass block is arranged at the outer side of the rotor; the upper and lower planes of the inside are provided with annular sector grooves in the radial direction; a permanent magnet is fixed in each groove; the magnetizing directions of the permanent magnets at the upper and lower layers are identical; the N poles and the S poles are alternately arranged; stator tooth grooves are formed in the upper layer stator and the lower layer stator; a coil is wound in each stator groove; the stators are fixed with the outer sides of bearings; the center of the rotor is a motor middle shaft; the bearings sheath the middle shaft; and the top of the middle shaft is provided with a photoelectric encoder. The momentum wheel has the advantages that in the moving process, the input is a three-phase power supply; a permanent magnet motor of an axial magnetic field structure is used, the momentum wheel can output great torque; by using the disc type structure of the momentum wheel, the structure of the momentum wheel is compact, and the axial size of the momentum wheel is effectively reduced; fractional-slot structure windings are used, so that the tooth groove torque of the momentum wheel can be effectively reduced, and the movement of the momentum wheel is smooth and stable; and meanwhile, the photoelectric encoder is used, so that the rotation condition of the momentum wheel can be precisely measured.

The invention provides a stator and a rotating linear two-degree-of-freedom permanent magnet motor with a modular structure. The rotating linear two-degree-of-freedom permanent magnet motor with the modular structure comprises a stator and a rotor, and the stator comprises a stator core, a rotating motion winding and a linear motion winding; the stator iron core is formed by a plurality of same modular iron core units in a three-phase mode on the circumference. Stator grooves are formed in the axial direction and the circumferential direction of an inner surface of the stator iron core at thesame time, so that stator teeth are distributed in an array mode and evenly distributed on all the modular iron core units. The rotating motion winding is wound on stator teeth which are axially arranged along an inner surface of the stator core along the linear motion direction to form a phase group centralized winding for driving rotary motion; and the linear motion winding is wound on the stator teeth arranged along the circumferential direction of the inner surface of the stator iron core along the circumferential direction to form a phase group centralized winding for driving linear motion. The structure is simple, the manufacturing is easy, and the material utilization rate is increased.

The invention discloses a built-in permanent magnet synchronous motor, relates to the technical field of a motor and aims to solve the technical problem of improving the comprehensive quality of the motor. Multiple permanent magnet slots are axially and symmetrically arranged in a rotor of the motor along the central axis of the rotor at intervals, three permanent magnets distributed in an arc band shape are arranged in each permanent magnet slot, wherein one permanent magnet is a middle steel magnet, and the other two permanent magnets are side steel magnets; the built-in permanent magnet synchronous motor is characterized in that each middle steel magnet adopts the normal magnetization vertical to the surface of the steel magnet, and each two side steel magnets in one slot adopt the non-normal magnetization, so that the arc center of a magnet arrangement arc of each permanent magnet slot is enabled not to coincide with the magnetization orientation point of permanent magnets in the corresponding permanent magnet slot. According to the motor provided by the invention, the comprehensive quality of the motor is greatly improved.

The invention discloses a tile-shaped magnet with a halbach array structure effect and a manufacturing method, relating to the field of magnetic shoe forming orientation A parallel orientation or radiation orientation mode in a traditional magnetic shoe forming process is changed, and a unique magnetic field orientation forming system is designed, so that magnetic moments in a magnetic shoe are arranged in a halbach array structure. The surface magnetic flux density of the magnetic ring assembled and combined by magnetic shoes prepared by the method is in good sine wave distribution, and the magnetic ring has a unilateral magnetism gathering effect, the working surface air gap magnetic field intensity is improved, the magnetic energy utilization rate is high, no performance loss exists, and the magnetic ring can be widely applied to motor design.

The invention discloses a radial magnetic field stator yoke-free double-rotor disc type permanent magnet synchronous motor. The motor comprises a stator, an outer rotor, an inner rotor, a rotor support, a rotating shaft, a front bearing, a rear bearing, a front end cover, a rear end cover and a housing. The stator is composed of a stator iron core and a stator winding. The outer rotor is composedof an outer rotor iron core and outer magnetic steel. The inner rotor is composed of an inner rotor iron core and inner magnetic steel. The rotor support is connected with the outer rotor, the inner rotor and the rotating shaft, the rotating shaft is supported by the front bearing and the rear bearing, the front end cover is connected with the stator iron core and the housing and provided with a bearing chamber and a cooling liquid water channel, the rear end cover is connected with the housing and provided with a bearing chamber, and the outer magnetic steel and the inner magnetic steel are permanent magnets. The radial magnetic field stator yoke-free double-rotor permanent magnet disc type motor has the outstanding advantages of high peak torque density, high efficiency, small size, light weight and disc-type thin appearance, and is particularly suitable for being used as an electric vehicle wheel edge driving motor, a hub motor, an integrated generator and the like.

The invention provides a high power density permanent magnet brushless double-feed electric motor in a novel structure. The motor comprises a first stator, a second stator and a rotor; the first stator and the second stator are arranged on two sides of the rotor; an external air gap is formed between the first stator and the rotor; an internal air gap is formed between the rotor and the second stator; the first stator and the second stator are connected through a stator support to be fixed; permanent magnets are arranged on the internal side and the external side of the rotor; the rotor is fixed on a rotary shaft; the first stator and the second stator are respectively provided with an armature winding. The high power density permanent magnet brushless double-feed electric motor in the novel structure can reduce manufacturing costs and improve the motor power density and efficiency.

The invention relates to the technical field of motors, and discloses an outer rotor motor of a polygonal dovetail type spliced magnetic steel structure. The outer rotor motor comprises a stator core, a stator coil, rotor magnetic steel and rotor back iron, wherein the rotor magnetic steel adopts the design of a first permanent magnet, a second permanent magnet and a third permanent magnet, a plurality of permanent magnets of which the cross sections are isosceles triangles or quadrangles are spliced into a circle to form the annular closed rotor magnetic steel, and a Halbach magnetizing mode is adopted, so that electromagnetic force borne by the stator coil in each stator tooth groove forms a closed loop in the tangential direction of the circumference, and therefore, an outer rotor is subjected to stable torque, and stable rotation is realized. Meanwhile, self-shielding can be formed in the Halbach magnetizing mode, the output torque can be increased, the torque pulsation can be reduced and the power density can be improved while the air gap magnetic flux density in the motor is ensured to be large enough, the vibration amplitude is obviously reduced under the condition of low order through radial force wave two-dimensional Fourier FFT2 analysis, and therefore, the dynamic performance of the motor is improved.

A pair of additive electromagnetical pole is added to rotor of the generator, and a group of lateral axis winding is installed on the stator to produce the invented AC generator. Proper capacitance is connected to the said winding so that leading current is generated. Thus, when the load current is raised, the total flux is raised so as to improve output voltage characteristic in order to meet the requirement of use. The invented generator possesses the features of simple structure, without sliding ring, brush and without need of DC excitation source so as to have the performances of high efficiency, low temperature rise. The technique is also suitable to three-phase magneto alternator.

A combined type magnetic field motor of two phase twenty poles radial stator and rotor is provided, each group of stators forms a transverse concave stator by an outer stator core, an inner stator core and a transition core, three of which are riveted by rivets stacked by core stampings , the outer stator core and the inner stator core are staggered with one polar distance along the cross section of an axial direction, two phase stators are relatively staggered with half a polar distance, the outer stator core and the inner stator core have the same length and height, the stator is limited by an end plate on a casing in up, down, left and right directions, and fixed in the casing by a bolt, a rotating shaft is provided with a rotor spoke which is provided with a rotor excitation ring formed by permanent magnet poles and rotor cores which are alternately connected, adjacent permanent magnet poles on the rotor excitation ring are opposite. The invention has the following advantages: an air gap magnetic flux density is improved, the output torque and the output power of the motor are improved, the structure and manufacturing technology of the stator are simplified, and production cost is reduced.

The invention discloses a moving-coil brushless DC (direct-current) permanent magnet motor with an inner and outer rotor structure. The moving-coil brushless DC permanent magnet motor comprises a shaft assembly and a moving assembly, wherein the shaft assembly comprises a rotating shaft, bearings, a first end cover, a moving-coil stator and a flange plate; the moving assembly comprises a casing, an outer permanent magnet, an inner permanent magnet, a magnetic conducting ring and a second end cover; the moving-coil stator comprises a cup-shaped framework and a winding and is further fixedly connected onto the first end cover through connection with the flange plate, the inner permanent magnet is arranged on the radial inner side of the moving-coil stator, and the outer permanent magnet is arranged on the radial outer side of the moving-coil stator; the inner wall of the inner permanent magnet is arranged on the magnetic conducting ring in a sleeving manner; the outer wall of the outer permanent magnet is tightly attached to the inner wall of the casing; the magnetic conducting ring and the casing are embedded and fixed with the inner side of the second end cover through clamp ports; the first end cover and the second end cover are convex, the first end cover is connected with the rotating shaft through the bearings, the second end cover is fixed with the rotating shaft through screws, and magnetic polarity of the inner permanent magnet is the same as that of the outer permanent magnet in the radial direction.

The invention discloses a parallel type double-stator hybrid excitation permanent magnet motor, and belongs to the technical field of permanent magnet motors. The parallel type double-stator hybrid excitation permanent magnet motor comprises a shell, a motor set A and a motor set B, and is characterized in that the motor set A and the motor set B are arranged in the shell in a parallel mode, a stator A of the motor set A is provided with a winding A with a high back electromotive force, a rotor A is provided with an NdFeB permanent magnet, the motor set A selects an operating point with low rotating speed and high torque to act as a rated operating point A, and control is performed by adopting a weak magnetic control mode when the rotating speed exceeds the rated operating point A; and a stator B of the motor set B is provided with a winding with a low back electromotive force, a rotor B is provided with an AlNiCo permanent magnet or a ferrite permanent magnet, the motor set B selects an operating point with high rotating speed and capable of meeting the high-speed load bearing capacity to act as a rated operating point B, and control is performed by adopting a magnetic link control mode when the rotating speed exceeds the rated operating point B. The parallel type double-stator hybrid excitation permanent magnet motor not only has the characteristics of low speed and high torque, but also has the characteristic of high-speed running. Meanwhile, the parallel type double-stator hybrid excitation permanent magnet motor has the characteristics of wide rotating speed range and high efficiency, and can improve the energy utilization rate of a system.

The invention provides a compressor, comprising a housing, and a rotor, a stator, and a crankshaft in the housing. The lower end of the crankshaft is provided with a first magnet. The bottom cover of the housing is provided with a second magnet corresponding to the first magnet. The magnetic pole polarity of opposite magnetic pole surfaces of the first magnet and the second magnet is opposite. The invention also relates to an air conditioner. The compressor and the air conditioner are provided with the first magnets on the lower ends of the crankshafts, and the bottom covers of the housings are provided with second magnets. The magnetic pole polarity of opposite magnetic pole surfaces of the first magnet and the second magnet is opposite. Thus, strong downward acting forces are applied on a pump rotor assembly, and stable operation of the pump structure of the compressor is ensured. Up-down displacement would not occur, and mechanical impact noise is effectively prevented.