32results about How to "Flux leakage coefficient is small" patented technology

The invention relates to a three-phase water-cooling permanent magnet synchronous motor which comprises a base, a permanent magnet rotor, an end cover, an outlet box, a bearing inner cover and a bearing, wherein the base comprises a water-cooling casing and a stator winding, and the water-cooling casing comprises a casing outer wall and a casing inner wall. The invention is characterized in that a helical groove is made on the surface of the casing inner wall, and helical convex ribs are formed in the groove and form a helical water groove with the casing outer wall. The permanent magnets of the permanent magnet rotor are arc permanent magnets with sections being crown faces, the arc permanent magnets are fixedly pasted on the surface of a rotor iron core in an equidistant manner according to the polarity along the circumference of the permanent magnet rotor and are mutually separated by insulation partition boards, both ends of each arc permanent magnet are fixed by insulation baffles, and an insulation sheath wraps the permanent magnet rotor outside. The invention has the advantages of uniform heat dissipation of the casing, high mechanical strength of the casing and low leakage coefficient of the permanent magnets, thereby improving the utilization rate of the permanent magnets, increasing the accumulation energy of air gaps, reducing copper loss and facilitating wire connection.

The invention discloses a rotor structure used for a tangential permanent magnet direct current brushless motor, and the tangential permanent magnet direct current brushless motor. The rotor structure comprises a rotor iron core, tangential permanent magnets and a rotation shaft; an even number of tangential permanent magnet grooves are formed in the circumference of the rotor iron core radially at the equal intervals; the tangential permanent magnets with the opposite polarities are arranged in the adjacent tangential permanent magnet grooves; the tangential permanent magnets are connected with or disconnected from the near air gap side; the central symmetry of the rotor iron core is maintained; the sides, close to the rotation shaft, of the tangential permanent magnet grooves are communicated with flux-insulation grooves on the two sides of the tangential permanent magnet grooves; the near air gap side of the flux-insulation grooves and the central line of the corresponding tangential permanent magnet grooves extend outwardly at an angle of alpha; and a radially-distributed flux-insulation bridge is formed between the adjacent flux-insulation grooves. The rotor structure used for the tangential permanent magnet direct current brushless motor is simple and compact in structure, small in magnetic leakage factor, high in mechanical strength, convenient to produce, low in manufacturing cost, higher in resistance to demagnetization, and high in overload capacity, so that the tangential permanent magnet direct current brushless motor is higher in torque / current ratio, torque / volume ratio and motor efficiency; and therefore, the rotor structure used for the tangential permanent magnet direct current brushless motor, and the tangential permanent magnet direct current brushless motor are brighter in the application prospects.

The invention discloses a permanent magnet synchronous motor consisting of a stator component and a rotor component. The stator component consists of a casing, a stator iron core and a armature winding, wherein a rotor shaft is a hollow shaft, and an internal ventilation hole with two communicated ends are arranged inside the hollow shaft; the rotor shaft is provided with an external ventilation hole communicated with the internal air through hole in the hollow shaft along a radial direction of the rotor shaft; a magnetic shield is provided with a ventilation hole of the magnetic shield along the radial direction; a magnetic pole is provided with a ventilation hole of the magnetic pole along the radial direction; the ventilation hole of the magnetic shield and the ventilation hole of the magnetic pole are communicated with the internal ventilation hole, and the three ventilation holes form a radiant-type radiating structure with the axial direction crossed with the radial direction. Compared with the prior art, the invention excellently controls the temperature rise of the motor in operation, reduces the demagnetization danger of an Nd-Fe-B permanent magnet, and reduces vortex heating and prolongs the service life of the normal operation of the motor at the same time.

The invention discloses a novel permanent magnetism auxiliary exciter rotor structure. An annular magnet yoke is internally provided with a rotating shaft, and a permanent magnet and a pole shoe are locked on the magnet yoke tightly at peripheral of the annular magnet yoke through a stainless steel screw. According to the invention, the stainless steel screw is employed to directly fix the pole shoe and the permanent magnet on the magnet yoke together, compared with a present rotor structure of a bound permanent magnetism auxiliary exciter, weftless glass riband and nonmagnetic filling materials are cancelled, not only are component processing and assembling operation convenient, but also air gap is small, a magnetic leakage coefficient is small, magnetic steel utilization rate is high, and performance is good, stable and reliable.

The invention discloses a magnetism gathering type direct-drive permanent magnet motor which mainly structurally comprises a rotor and a stator and can be a linear motor or a rotary motor. The motor is mainly characterized in that a plurality of permanent magnets in the rotor iron core and the stator iron core are mounted in a specifically designed mounting mode and magnetizing directions, and the rotor and the stator are assembled at specific relative positions, so that the magnetism gathering effect of the plurality of permanent magnets is remarkable, and a relatively high permanent magnetic field utilization rate and a relatively small magnetic leakage coefficient are obtained; and therefore, the thrust density is obviously increased. The magnetism gathering type direct-drive permanent magnet motor has the advantages of being high in thrust density, small in thrust fluctuation, low in cost, easy to machine and assemble, reliable in operation, easy to expand multiple modules and the like.

The invention belongs to the technical field of motors, and particularly relates to a new permanent magnet variable frequency motor rotor blank structure. According to the adopted technical scheme, the motor blank comprises a blank body; at least one magnetic steel hole group is arranged in the blank body; each magnetic steel hole group is composed of two V-shaped holes; and a magnetic line guide hole is arranged between each magnetic steel hole group and the edge of the blank body. After the magnetic steel is mounted, the direction of the magnetic line can be guided through the magnetic line guide hole, the magnetic flux leakage coefficient is reduced, and the motor efficiency is improved. Meanwhile, the magnetic line guide hole can reduce noise generated when the motor operates.

The invention provides a built-in radial permanent magnet rotor structure, which comprises a rotation shaft, and a rotor core sleeved on the rotation shaft. The rotor core is an integrated body formedby connecting at least two iron core sections through cage bars and end rings. Each iron core section comprises a hollow rotor section and at least two permanent magnets in opposite poles, wherein the permanent magnets are arranged on the hollow rotor section. The magnetic poles of the permanent magnets of the adjacent two iron core sections are same. The hollow rotor section is formed by superposing a plurality of rotor punching sheets. The cage bars comprise a plurality of cage bars 1 and more than two cage bars 2. The cross section of the cage bar 1 is circular; the cross section of the cage bar 2 comprises a circular portion and a rectangular portion connected with the circular portion. The cage bars 1 are arranged between the circular portions of the adjacent two cage bars 2. The permanent magnets are arranged between the rectangular portions of the adjacent two cage bars 2. The rectangular portion of the cage bar 2 is a magnetic isolation bar, which carries out magnetic isolation on the left and right two permanent magnets, and replaces conventional air gap magnetic isolation, thereby achieving a purpose of carrying out magnetic isolation on the adjacent permanent magnets. The built-in radial permanent magnet rotor structure has the advantages of compact structure, large power density, reliable performance and long service life.

The invention provides a stator punching sheet, a stator and a motor. The stator punching sheet comprises a punching sheet body; a central hole is formed in the punching sheet body; small grooves andbig grooves are formed in the punching sheet body in the circumferential direction of the central hole; and the punching sheet body is in symmetrical arrangement by taking the central line of the groove openings of the small grooves as the axis. By virtue of the stator punching sheet, the problem of increasing of the motor cost caused by the stator punching sheet in the prior art is solved.

The invention discloses a multi-pole permanent magnet DC brushless motor used for steering gear and the steering gear. A multi-pole permanent magnet brushless DC motor for steering gear, including a stator fixed in the motor housing, a rotor set in the stator, and a sensor arranged along the circumference of the rotor and used to sense the pole change during the rotation of the rotor and send out signals The sensor, the rotor includes a plurality of tile-type permanent magnets used to increase the magnetic induction density of the steering gear to improve the rotation control accuracy of the steering gear, and the multi-piece tile-type permanent magnets are arranged equidistantly along the circumference of the rotor and fixed to the rotor of the rotor On the core, the shapes of the tile-type permanent magnets are the same. The tile-type permanent magnets are south pole permanent magnets or north pole permanent magnets. One south pole permanent magnet and one north pole permanent magnet form a pair of magnetic poles, and the rotor contains at least two pairs of magnetic poles. The tile-type permanent magnet can be assembled and then magnetized along the rotor circumference at one time, or it can be magnetized separately and then assembled. The assembly process is simple, the magnetic flux leakage coefficient is small, the air gap magnetic density is high, and the utilization rate of the permanent magnet is higher.

The invention relates to a motor stator core. The stator core is formed by nesting an annular oriented silicon steel core and an annular non-oriented silicon steel core arranged at the external of theannular oriented silicon steel core; the annular oriented silicon steel core is formed by superposing two kinds of oriented silicon steel sheets, and is provided with oriented grooves; the oriented grooves and the annular non-oriented silicon steel core are fitted with each other to form enclosing grooves; and notch magnetic bridges are arranged between the oriented grooves and the inner side wall of the annular oriented silicon steel core and provided with magnetic bridge through holes, so that magnetic circuits of the notch magnetic bridges can be saturated. During usage, the magnetic bridge through holes can saturate the magnetic circuits of the notch magnetic bridges, so that air-gap flux density can be enhanced, magnetic flux leakage coefficients can be reduced, and motor power density can be increased; and dovetail grooves can effectively reduce notch magnetic flux leakage and air gap flux pulsation, so that the output torque of motors can be enhanced.

The invention relates to an electric motor used for a pump, in particular to an electric motor used for a wet-type operation pump. The electric motor used for the wet-type operation pump comprises a stator 1, a casing pipe 2 and a rotor 3 which is combined with a rotating shaft 4 into a whole, wherein one end of the rotating shaft 4 is used as an energy output end of the electric motor, and the casing pipe 2 is located between the stator 1 and the rotor 3. The rotor 3 is located in the casing pipe 2, and the casing pipe 2 enables the space of the rotor 3 to be sealed relative to the space of the stator 1. The stator 1 and the casing pipe 2 are in an integrated seamless-connection structure. According to the assembly method of the electric motor used for the wet-type operation pump, the casing pipe 2 is directly molded on the stator 1 in an injection mode with injection molding technology adopted, and then the rotor 3 is arranged in the casing pipe 2. According to the electric motor used for the wet-type operation pump and the assembly method, on the premise of ensuring the strength of the casing pipe, an air gap between the stator and the rotor is effectively reduced, and the operation efficiency of the electric motor used for the wet-type operation pump is improved. Besides, the manufacturing technology is simple, and the cost is low.

The invention discloses a double V-type permanent magnet hub motor magnetic circuit structure and relates to the technical field of motor structure. The double V-type permanent magnet hub motor magnetic circuit structure comprises a stator, a rotor, a rotor shaft, a permanent magnet, a magnetic isolation bridge, a winding slot and a ventilation hole. The permanent magnet hub motor has good runningcharacteristics. The rotor is an embedded radial rotor and has a low magnetic flux leakage coefficient. No magnetic isolation measures are required on a rotating shaft. A pole-arc coefficient is easyto control. Rotor punching pieces have high mechanical strength. The ventilation hole reduces the magnetic flux at the alignment position. The magnetic circuit structure has low noise performance, reduces the core loss of the rotor, and enhances a heat dissipation effect.

The invention provides a fixed structure and a fixing method of motor permanent magnets and a motor comprising the fixed structure. The fixed structure of the motor permanent magnets comprises a rotor iron core, a composite material sleeve and the permanent magnets, wherein the composite material sleeve is sleeved on the outer surface of the rotor iron core and comprises a plurality of composite material sleeve rings which are arranged along the axial direction and independent from one another; each permanent magnet is arranged between a gap between the rotor iron core and each composite material sleeve ring. The fixing method comprises the following steps: coating anaerobic adhesive on the outer surface of the rotor iron core and the inner surfaces of the composite material sleeve rings, and sleeving the composite material sleeve rings on the rotor iron core; embedding the permanent magnets in the gaps between the rotor iron core and the composite material sleeve rings; and repeating the steps until the permanent magnets are all distributed on the outer surface of the rotor iron core, wherein the composite material sleeve rings form the composite material sleeve along the axial direction. According to the fixed structure and the fixing method of the motor permanent magnets and the motor comprising the fixed structure, the assembling efficiency and assembling precision of the permanent magnets can be improved, and the gaps between the permanent magnets and a stator winding are reduced so that the leakage coefficient is reduced.

The invention discloses a rotor of a built-in permanent magnet motor. The rotor comprises a rotating shaft, a rotor punching plate, permanent magnets and slot wedges, wherein the rotor punching plate is sleeved on the rotating shaft, and permanent magnet slots and slot wedge slots are formed in the outer side of the rotor punching plate; the slot wedge slots are positioned between the permanent magnet slots and the rotating shaft; the permanent magnets are arranged in the permanent magnet slots; the slot wedges are arranged in the slot wedge slots; first magnetic isolation bridges are arranged between the permanent magnet slots and the outer side of the rotor punching plate; and second magnetic isolation bridges are arranged between the adjacent slot wedge slots. According to the rotor, the first magnetic isolation bridges are arranged between the permanent magnet slots and the outer side of the rotor punching plate, the permanent magnet slots are through holes formed in the rotor punching plate, and the second magnetic isolation bridges are arranged between the adjacent slot wedge slots; through the arrangement, the width of each magnetic bridge can be adjusted, so that the magnetic density of air gaps is high, and the utilization rate of the permanent magnets is high, namely the magnetic leakage factor of the built-in permanent magnet motor is reduced. The invention also discloses the built-in permanent magnet motor with the rotor.

This invention relates to a permanent magnet brushless DC 4-quadrant motor, in which, magnetic poles of the stator and rotor are in a symmetric geometrical structure with salient poles at either side and 3:2 tooth pole ratio, the groove number of the stator winding is the pole number of the rotor plus 2 or 4, centralized excitation windings serial to each other are mounted on the two symmetric salient poles of the stator to form a phase, the rotor is composed of an axis, a soft magnetic core, a permanent magnet, a magnetic shoe and a ringer, the magnet is installed on the subsurface of soft core of the rotor to form a magnetic pole rotating synchronously and an opposite vertical angle is formed to a column rotor at the outer circle of the pole shoe of the magnet by the non-magnetism ringer and an interference method.

The invention discloses a design method of a novel high-temperature-resistant solid rotor asynchronous magnetic coupling. The method is a new type of non-contact electromagnetic induction power transmission device developed in recent years. Rare earth permanent magnets are arranged on the inner side of the outer rotor of the coupling. . The internal rotation adopts a solid rotor and does not require permanent magnet materials. The high-temperature-resistant asynchronous solid-rotor magnetic coupling designed by sample selection effectively solves the problem that the previous magnetic-drive pumps cannot transport high-temperature media, and has high economic value and good application prospects. The design and analysis of the magnetic circuit of the magnetic coupling is an important basis for solving the electromagnetic torque of the magnetic coupling. It is necessary to optimize the design of the magnetic circuit, so the present invention selects the magnets to be closely arranged for magnetic concentration, and derives the magnetic permeability and magnetic flux leakage system, which has good practicability and has very important reference value for the research of green machinery.