51results about How to "Small torque" patented technology

The invention discloses a tooth splicing type high-voltage and high-speed motor stator and a design method, the tooth splicing type high-voltage and high-speed motor stator comprises a stator yoke and stator teeth, the stator teeth are uniformly distributed along the inner circumference of the stator yoke, and a stator slot for installing a winding is formed between adjacent stator teeth; the stator teeth are of an axisymmetric structure, the side edge of each stator tooth comprises a first contour molded line, a second contour molded line, a third contour molded line and a fourth contour molded line which are sequentially arranged in the radial direction of the stator, and the first contour molded lines of the adjacent stator teeth form winding installation areas. According to the invention, the stator teeth are designed to be detachable through the splicing structure, the line insertion of the formed winding can be smoothly carried out in the winding installation area formed by the first contour molded line, the groove width of the customized teeth can be ensured, and the stator teeth can be conveniently inserted in the winding installation area formed by the first contour molded line. The cogging torque is reduced, and the rotor eddy current loss of the motor is reduced.

The invention relates to the field of servo motors, and discloses a motor rotor iron core and a motor cogging torque reduction method and device.The motor rotor iron core of a hemispheroid-like structure is composed of an iron core buckling point structure and a permanent magnet ring, and the outer contour of the bottom of the motor rotor iron core is a circle-like shape formed by connecting a plurality of three-section type geometric lines; the rotor has a unique three-section type rotor core excircle structure. According to the structure, the cogging torque can be reduced, the back electromotive force waveform sinusoidal property of the motor can be improved, the pole-arc coefficient is optimized by changing the circumscribed included angle between the straight line section and the arc section and the eccentric distance between the center of the arc section and the center of the rotor core, and the design target is completed through finite element analogue simulation analysis. Finally, the effects of reducing the cogging torque of the motor, improving the sine property of the back electromotive force waveform and guaranteeing the positioning and control precision of the motor are achieved.

The utility model discloses a combined type stator punching sheet and a motor. The combined type stator punching sheet comprises a stator yoke ring and a stator tooth ring. An inner cavity is formed in the middle of the stator yoke ring; the stator tooth ring is arranged in the inner cavity; wherein the stator yoke ring and the stator tooth ring are connected and jointly form a plurality of closed slots which are annularly distributed, and the closed slots are used for accommodating winding coils. According to the utility model, the stator is designed into the yoke ring and the toothed ring in a split manner, the yoke ring and the toothed ring are combined through the common connecting edge and the buckle structure, the overall structural strength is good, the process is simple to realize, and the pre-wound coil framework assembly can be sleeved between the tooth parts on the stator toothed ring before the yoke ring and the toothed ring are combined, so that the high slot fullness rate can be realized; this increases the power density of the electric machine.

The utility model discloses a casing and a motor, the casing comprises an inner casing, an outer casing and a first damping structure, the outer casing is sleeved outside the inner casing, the first damping structure is arranged between the inner casing and the outer casing, and the inner casing and the outer casing are arranged at an interval and are connected through the first damping structure. According to the technical scheme of the utility model, the technical problem of poor vibration and noise reduction effect of the existing motor vibration reduction mode is solved.

The utility model discloses a surface-mounted combined magnetic pole rotor structure for a shielding motor, which comprises a rotor sheath, first permanent magnets and a second permanent magnet, and the first permanent magnets are arranged on the two sides of the second permanent magnet. And the residual magnetism of the first permanent magnet of each pole of combined permanent magnet is smaller than that of the second permanent magnet, so that the cogging torque can be effectively reduced, and the radial air gap flux density is more sinusoidal, thereby improving the sinusoidal property of the counter electromotive force and reducing the ripple torque of the motor. According to the rotor structure, the thickness of each permanent magnet is equal, the rotor sheath is in interference fit with the permanent magnets, the safety of the permanent magnets is more reliable, the stator does not need skewed slots, and the torque density and the power factor of the motor cannot be reduced.

The invention discloses a three-pole suspension stator type permanent magnet bearingless switched reluctance motor and a control method, torque stators with the same phase number are arranged between suspension stator teeth of the motor, and permanent magnets are tightly arranged between the suspension stator and the torque stators to generate bias magnetic flux required by suspension; the cogging torque generated by the permanent magnets is small, and the torque generated by the torque winding is promoted; three teeth of the suspension stator are respectively wound with a suspension winding, one ends of the three suspension windings are connected together, and the other ends of the three suspension windings are connected into the three-phase full-bridge inverter. In the control process, two equivalent current given values which are perpendicular to each other can be obtained after the displacement ring is adjusted, the given value of the three-phase suspension winding current can be obtained only after current conversion, two radial suspension forces can be adjusted in real time through current chopping control, control is easy, and implementation is convenient. According to the invention, the motor torque is decoupled, the torque is short in magnetic circuit, and the suspension force / current ratio is large; the permanent magnets can be made of ferrite permanent magnet materials, cost is low, and application prospects are good.

The utility model discloses a quick plug -in drip irrigation belt bypass connector belongs to the field of connector, concretely is a quick plug -in drip irrigation belt bypass connector, including the shell, be provided with the connector in the shell, the inner wall of connector is opened and is provided with the limit slot, be provided with the limit post in the limit slot, the limit post is fixedly connected with the inner wall of shell, the below of connector is provided with the convex ring platform, the convex ring platform is fixedly connected with the inner wall of shell, the top of connector is fixedly connected with the bypass main part, through setting plug -in drip irrigation belt, and the connector is along the limit post along the limit slot cooperation track sliding, avoids the connector deflection, the jam when plugging, ensures that one inserts accurate, makes through the limit post, limit slot direction, and bare hands can complete plugging, need not wrench etc.

This utility model relates to the field of conductive slip ring technology and discloses a conductive slip ring, including a slip ring shell, a fixed shaft inserted into the bottom of the slip ring shell, an inner oil seal snapped into the inner top of the fixed shaft, a sealing ring assembly snapped into the inner top of the inner oil seal, a wear-resistant ring covering the top of the sealing ring assembly, and a rotating shaft inserted into the inner top of the fixed shaft. This utility model, through an optimized and stable structure, achieves this by snapping the sealing ring assembly into the top of the inner oil seal, then snapping the wear-resistant ring into the sealing ring assembly inside the top of the inner oil seal, and finally snapping the inner oil seal, along with the sealing ring assembly and wear-resistant ring, into the inside of the fixed shaft. The rotating shaft is then inserted into the slip ring shell, passes through the inner oil seal at the top of the fixed shaft, and snaps into the rotating shaft. The sealing ring assembly and wear-resistant ring at the top of the inner oil seal achieve a balance between low torque and high speed, thus realizing optimized stability.

The invention relates to the technical field of motors, in particular to a stator punching sheet, a stator iron core comprising the stator punching sheet and an external rotor motor comprising the stator iron core. The stator punching sheet is annular, twelve stator tooth grooves used for winding stator windings are evenly formed in the outer periphery of the stator punching sheet at intervals in the circumferential direction, the diameter of the outer circle of the stator punching sheet is D1, the diameter of a virtual circle concentric with the outer circle on the stator punching sheet is D2, D2 / D1 is equal to 0.45-0.5, the area of an annular area between the outer circle and the virtual circle is the effective magnetic circuit area, and D1 is larger than D1 and smaller than D2. The stator tooth grooves are located in the annular area, and the proportion of the total area of the 12 stator tooth grooves to the effective magnetic circuit area is 0.45-0.5. The effective size of the motor can be reduced, the torque ripple of the motor is reduced, and the operation efficiency of the motor is improved.

The utility model discloses an ultralow-torque rotation-resistant steel wire rope, which relates to the technical field of steel wire ropes, and adopts the following scheme that the ultralow-torque rotation-resistant steel wire rope comprises an inner core rope, an inner hinged steel wire is rotatably wound outside the inner core rope, an outer hinged steel wire is reversely and rotatably wound outside the inner hinged steel wire, and lubricating grease is coated between the outer hinged steel wire and the inner hinged steel wire; the inner core rope is arranged and is made of a high-strength and low-elongation synthetic material, so that the tensile strength and the extrusion resistance of the steel wire rope are improved, and the use safety of stress stretching is ensured; a multi-layer strand structure is formed by adopting a special twisting process, the twisting directions of all layers of steel wires are opposite, the overall torque of the steel wire rope is effectively reduced, the problem of twisting and winding is avoided, the steel wires have high strength and toughness after heat treatment, the surfaces of the steel wires are coated with lubricating grease or anti-rust oil, friction and abrasion between the steel wires are reduced, and the service life of the steel wire rope is prolonged. And the service life of the steel wire rope is effectively prolonged.

This utility model discloses a slotless AC motor structure based on a reduced-core design, comprising a housing, a stator module, a partial core module, and a rotor module. The housing includes a main body and a base plate. The stator module is built into the housing and includes an annular non-magnetic frame and coils. The partial core module includes several cores, which are mounted one-to-one on a core mounting bracket, with air gaps between adjacent cores. This slotless AC motor structure aims to solve problems such as significant cogging effect, excessive core weight, and inflexible magnetic circuit in traditional motor structures. The motor eliminates the traditional slotted stator structure, adopting a combination design of slotless coils and a partial magnetic core. While ensuring effective control of the magnetic flux path, it significantly reduces motor weight, manufacturing complexity, and improves dynamic response performance.

The utility model relates to an encoder dismounting device. The encoder dismounting device comprises a driving mechanism, a clamping assembly, a supporting housing and a vertically-arranged lead screw. The driving mechanism comprises a first bevel gear and a second bevel gear which are meshed with each other, and the first bevel gear is in transmission connection with the upper end of the lead screw; the clamping assembly comprises a plurality of hook claws, and the multiple hook claws are arranged on the outer side of the lead screw in a sleeving mode. The top of the supporting housing is connected with the lower end of the lead screw. The supporting housing is provided with a through groove, and the claw extends into the supporting housing through the through groove to clamp the encoder. The encoder dismounting device provided by the utility model can effectively, quickly and safely dismount the encoder, and improves the maintenance speed of equipment when problems are caused by faults of the encoder; and the motor main shaft and the encoder cannot be damaged during disassembly, so that the cost of motor accessories is saved to a certain extent.

The utility model provides a motor of an industrial fan, and belongs to the technical field of industrial fans. The problem that an existing motor is low in power is solved. The motor of the industrial fan comprises a stator shaft, a stator assembly and an outer rotor, the stator assembly is located in the outer rotor, the inner end of the stator shaft is fixedly connected with the stator assembly, the outer end of the stator shaft penetrates out of the outer rotor, 54 grooves are formed in the circumferential edge of the stator assembly at equal intervals, 48 pieces of magnetic steel are fixedly connected to the inner circumferential wall of the outer rotor at equal intervals, and the outer rotor is located in the outer rotor. And a gap is formed between two adjacent magnetic steels. The motor of the industrial fan has the advantage of increasing the power of the motor.

The invention relates to the technical field of oil presses, in particular to a servo motor driving system. Comprising a main driving shaft, two supporting assemblies, a support, a speed reducer, two driving boxes and a servo motor, driving gears are arranged at the two ends of the main driving shaft, two sliding rods are arranged in the support, a table top is arranged between the two sliding rods in a sliding mode, connecting assemblies are arranged at the two ends of the table top, and two hoisting bases are arranged at the inner top of the support; the servo motor drive has the advantages of being high in precision, quick in response, high in stability, multifunctional, easy to maintain, high in torque, good in low-speed stability, easy to operate and low in noise, and meanwhile on the premise that space maintenance can be achieved, the service life of the servo motor is prolonged, and the service life of the servo motor is prolonged. And the space needed by product installation can be reduced, the overall cost is reduced, damage is not prone to occurring, the overall after-sale cost is reduced, more energy is saved, and efficiency is higher.

The utility model discloses an asymmetric notch punching sheet group structure and a permanent magnet brushless motor stator structure, the asymmetric notch punching sheet group structure comprises a first punching sheet, a second punching sheet and a third punching sheet, a first side of the second punching sheet is spliced with the first punching sheet, and a second side, opposite to the first side, of the second punching sheet is spliced with the third punching sheet. The first punching sheet, the second punching sheet and the third punching sheet respectively comprise a first end part and a second end part, the side edge of the first end part is an inclined side edge, the side edge of the second end part is a straight side edge, a first notch is formed between the second end part of the first punching sheet and the first end part of the second punching sheet, and a second notch is formed between the second end part of the third punching sheet. A second notch is formed between the second end part of the second punching sheet and the first end part of the third punching sheet, and the first notch and the second notch are asymmetrically arranged; according to the rotor, the asymmetric notch structure design is adopted, and the asymmetric structure enables the notch effect to be subjected to symmetric balance damage in the slot passing process of the rotor, so that the cogging torque is reduced, the qualified rate of production is greatly improved, and the production quality cost is reduced.

This invention discloses a low-leakage flux asymmetric magnetic pole rotor and magnetic pole motor, comprising rotor laminations with eight magnetic pole regions uniformly arranged on the laminations. A first, second, third, and fourth permanent magnet group are sequentially repeated twice on the eight magnetic pole regions. Multiple identical rotor laminations are stacked and welded to form a rotor core. The magnetic pole polarities of any two adjacent permanent magnet groups in the eight magnetic pole regions are opposite. The permanent magnetic field within a single magnetic pole is asymmetric, and the permanent magnetic fields of adjacent magnetic poles are also asymmetric, reducing cogging torque, torque pulsation, and vibration noise. Each magnetic pole consists of multiple layers of permanent magnet steel and a magnetically insulating air gap, resulting in significant magnetic focusing effect, high magnetic field strength, high power density, low air gap harmonic magnetic flux density, low hysteresis loss, low stator core eddy current loss, and high motor output efficiency.

The present invention discloses a fitness equipment pulling pump motor, comprising a mounting shaft, a rotor and a stator; a rotating wheel is provided on one side of the rotor; the stator is evenly distributed with mounting bosses extending in a radial direction; the mounting bosses are movably hinged with a movable iron core; the movable iron core is provided with a spiral groove; the stator is provided with a first wire frame and a second wire frame; a stator winding is provided between the first wire frame and the second wire frame; the second wire frame is slidably provided with a cam ring; the cam ring is provided with a guide rod; the guide rod is provided with a lever extending in a radial direction; the end of the lever is movably embedded in the corresponding spiral groove; the cam ring is provided with a cam groove; the inner circumferential wall of the rotor is evenly distributed with magnetic steel; the rotor is provided with a driving ring; the driving ring is provided with a bayonet; the bayonet is movably embedded in the cam groove; when the rotor rotates, the cam ring is driven to slide back and forth through the cooperation of the bayonet and the cam groove, so that the movable iron core is reciprocatingly deflected; it is beneficial to improve the linear smoothness of the output resistance torque of the pulling pump, improve the use feel of the pulling pump, and provide a better use experience.

The present invention provides a large-working-space inchworm-like robot with a serial-parallel hybrid mechanism, which solves the shortcomings of the existing high requirements on the robot's structural design and motion gait control, and brings difficulties to the continuous or further miniaturization of the robot. The present invention provides a new type of serial-parallel hybrid mechanism type inchworm-like robot, which adopts a 5-degree-of-freedom serial-parallel mechanism as a driving mechanism, wherein the parallel mechanism has the ability to rotate on a hemispherical surface; the robot has high maneuverability, can simultaneously realize the "Ω" motion and deflection motion of the inchworm, can not only move on cracked surfaces and rough surfaces, but also cross some lower obstacles; it has the advantages of strong controllability and large load capacity of the parallel mechanism, and the advantage of a large working space of the serial mechanism.

This invention discloses an intelligent ventilation system and its control method based on a high-torque motor, solving technical problems such as insufficient heat dissipation, complex assembly, and poor sealing in existing technologies. The rotor assembly adopts an integral cast housing combined with polymer-bonded magnets, significantly improving structural strength and heat dissipation efficiency. The stator assembly features an innovative multi-slot winding design and a double-sealing structure, balancing high power density and long service life. The matching shaftless fan system achieves quick installation through a clamp structure, avoiding the complexity and safety hazards of traditional threaded connections. Furthermore, by introducing intelligent control and IoT technology, the ventilation system can adaptively adjust its operating mode according to changes in the surrounding environment or user needs, achieving healthy, safe, and hygienic ventilation. This invention is applicable to exhaust fans, fans, air purification equipment, and other fields, and features high efficiency, reliability, and ease of maintenance.

The utility model relates to a square valve and biological safety protection equipment applied to a filtering ventilation pipeline, which comprises a supporting part and an overturning part, the supporting part comprises a rectangular valve body, and two opposite surfaces of the rectangular valve body are respectively provided with an air inlet and an air outlet; the overturning part comprises a rotating shaft, a supporting shaft, a first connecting rod and a second connecting rod, the rotating shaft is arranged in the rectangular valve body in a penetrating mode, the supporting shaft is arranged in the rectangular valve body, and the axis of the supporting shaft is parallel to the axis of the rotating shaft; the end, away from the second connecting rod, of the first connecting rod is connected with the rotating shaft, and the end, away from the first connecting rod, of the second connecting rod is hinged to the supporting shaft. A valve plate is arranged on the surface of the supporting shaft in the axial direction. The rotating shaft rotates to drive the valve plate to abut against the air outlet. Connection of the square air pipes is achieved through the rectangular valve body, the double-connecting-rod mechanism rotates to drive the valve plate to turn over so that the rotating torque can be reduced, the rotating amplitude of the whole valve plate is small, the installation space of the whole valve body is reduced, and the square air pipe reversing valve is suitable for various installation environments.

The present invention belongs to the technical field of vehicle optimization design methods, and specifically relates to a collaborative optimization design method for vehicle transmission system and drive motor parameters. Based on vehicle parameters and performance indicators, with vehicle power, economy and motor performance as optimization targets, a high-precision machine learning prediction model for the motor is constructed, and a rapid estimation mathematical model for the motor efficiency Map is further constructed. Based on the high-precision machine learning prediction model for the motor and the rapid estimation mathematical model for the motor efficiency Map, a collaborative design optimization model for the vehicle transmission system and motor structural parameters is constructed. The method is solved by a multi-objective marine predator optimization algorithm, and the optimization of the electric vehicle transmission system is integrated with the motor structure optimization in an integrated design. The motor structural parameters are optimized with the goal of improving the vehicle drive efficiency, thereby effectively improving the vehicle power and economy, and at the same time reducing the cogging torque of the permanent magnet synchronous motor to reduce the vibration noise of the motor.

The invention discloses a counterweight-free overhanging type hanging basket module and a construction method, and relates to the technical field of building construction. The counterweight-free overhanging type hanging basket module comprises an overhanging supporting assembly, a first rope and a hanging basket elevator, the cantilever supporting assembly comprises a base, a cantilever beam, a stand column and a diagonal draw bar. The outrigger is pressed on the top surface of the base and is connected with the stand column; the cantilever beam is transversely arranged; the other end of the diagonal draw bar is connected with one end, far away from the base, of the cantilever beam; one end of the first rope is connected with the hanging basket elevator and the other end is connected with the shear wall; the middle of the first rope is in lap joint with the overhanging supporting assembly. The overhanging supporting assembly supports the first rope and the hanging basket elevator, so that the hanging basket elevator can move longitudinally and does not collide with an outer wall, and construction personnel and building materials are transferred. And one end, far away from the hanging basket elevator, of the first rope is connected with the shear wall, so that the use of a balancing weight is avoided, the longitudinal space is not required, and more excellent environmental compatibility is achieved.

The embodiment of the invention discloses a motor and oral cavity cleaning equipment. The motor comprises a stator assembly and a rotor assembly, the stator assembly comprises at least one pair of stator core bodies; the rotor assembly comprises a power shaft and a magnet assembly; each magnet assembly is configured to comprise a first magnet and a second magnet which are arranged in the circumferential direction of the power shaft and matched with the same stator core body, and at least part, close to the stator core body, of the first magnet and at least part, close to the stator core body, of the second magnet are configured to have different polarities; when the magnet assembly is located at the balance position, the ratio range of the central angle corresponding to the overlapped part of the single magnet in the magnet assembly and the projection of the stator core body to the half of the central angle corresponding to the inner arc of the stator core body facing the magnet assembly is 40%-70%.

The utility model discloses a hammering releasing machine and a steel claw beam positioning device thereof, the steel claw beam positioning device comprises an oil cylinder support, a first oil cylinder, a connecting block and a positioning claw, a cylinder barrel of the first oil cylinder is connected with the oil cylinder support through the connecting block, a piston rod of the first oil cylinder is hinged with the upper part of the positioning claw, and the piston rod of the first oil cylinder is connected with the oil cylinder support through the connecting block. The rear end of the lower portion of the positioning claw is hinged to the oil cylinder support, and a clamping groove with a downward opening is formed in the front end of the lower portion of the positioning claw. The steel claw cross beam positioning device is additionally arranged on the hammering loosening machine, so that the distance between the clamping position of the guide rod and the striking stress position of the hammering device is shortened, the stress on the guide rod is indirectly reduced, the guide rod is not easy to deform when being stressed, the normal work is ensured, and the working efficiency is greatly improved.

The invention discloses a rotor punching sheet and a permanent magnet motor thereof, the rotor punching sheet comprises a sheet body and even number of synthetic magnetic poles, and the even number of synthetic magnetic poles are distributed on the sheet body along the circumferential direction; an arc corresponding to the outline of the outer circle of each combined magnetic pole and the shaft hole of the sheet body are eccentric, and a first notch and a second notch which are concave inwards are formed in the two ends of the arc respectively and are symmetrical about the midpoint of the arc. The arcs of the outer circle outlines of the combined magnetic poles are eccentric to the rotor shaft hole, and each arc is provided with the first notches and the second notches which are symmetrically distributed, so that uneven air gap distribution which is in a specific shape and is in a certain regular size is formed, which is equivalent to that very ingenious pole cutting treatment is performed on the rotor; the sine degree of air gap flux density can be optimized, the effects of weakening harmonic waves of all orders and reducing cogging torque are achieved, and vibration and electromagnetic noise are reduced while the efficiency of the motor is improved.

The invention discloses a permanent magnet synchronous motor predictive current control method and system, and belongs to the technical field of permanent magnet synchronous motor control. When a torque instruction changes drastically in a medium-high speed range, output voltage saturation is extremely easy to occur in dead-beat predictive current control, so that q-axis current is difficult to excite to an instruction value by the saturated output voltage in a sampling period, and the dynamic performance of torque rise at the medium-high speed is seriously reduced. Therefore, under the condition, the rising speed of the q-axis current is increased through flux weakening operation, and then the operation of increasing the torque is carried out at the higher q-axis current rising speed. The optimal flux-weakening current is determined based on a q-axis current rise time prediction algorithm, so that the total time required by flux-weakening operation and torque rise operation is minimum, and the torque dynamic performance of dead-beat prediction current control under medium and high speeds can be effectively improved.

The invention relates to a combing machine (100) for a spinning preparation process, having a machine frame (10) in which at least two combing heads (11) are arranged and having a main drive motor (12) for driving the combing heads (11). According to the invention, a main shaft (15) is provided, which is operatively connected to the main drive motor (12), wherein the main shaft (15) drives the at least two combing heads (11), wherein the combing heads (11) are operatively connected to the main shaft (15) in such a way that the combing cycles of the combing heads (11) run in phase opposition in the operation of the main drive motor (12).

The application discloses a kind of multi-physical field experimental devices for strong magnetic field, it is related to strong magnetic field technical field, including bearing assembly, pneumatic stirring assembly, reaction bottle fixing assembly and photo-thermal liquid bath component;Bearing assembly includes bearing frame and lifting mechanism, pneumatic stirring assembly includes air supply equipment, flexible air pipe, turbine, planetary reducer and stirring paddle, reaction bottle fixing assembly includes fixed frame structure and reaction bottle, photo-thermal liquid bath component includes outer bushing, heat equalizing cylinder, heating film, quartz window, light source and radiator.The application has the advantages that the reaction area can be accurately adjusted to the target magnetic field strength and magnetic field gradient position by precise positioning and lifting, and the illumination, heating and stirring can be cooperatively loaded and relatively independently controlled in the local reaction bottle, so as to meet the stable operation and rapid sampling requirements of multi-physical field reaction experiment under strong magnetic field extreme environment.

The utility model relates to a rotor structure of a motor for a vehicle, which comprises a rotor, the rotor comprises a magnetic conductive ring and a plurality of permanent magnets, each permanent magnet comprises a first arc-shaped surface, the first arc-shaped surfaces are contacted with the magnetic conductive ring, the radial width of the middle part of each permanent magnet is greater than the radial width of the two ends of each permanent magnet, and the first arc-shaped surfaces are in contact with the magnetic conductive ring. The width of the permanent magnet in the radial direction is gradually reduced from the middle to the two ends; the permanent magnet further comprises a second arc-shaped surface, and the second arc-shaped surface and the first arc-shaped surface are oppositely arranged. Compared with the prior art, the width of the permanent magnet in the radial direction is gradually reduced from the middle to the two ends, so that unequal air gaps are formed between the permanent magnet and the stator, the air gaps are non-uniform, namely the air gap in the center of the permanent magnet is smaller, the end part of the permanent magnet is larger, and the air gap magnetic flux density distribution under the permanent magnet is closer to sine waves; therefore, the cogging torque is reduced, and the vibration and noise of the motor are reduced.

The invention relates to the field of industrial equipment, in particular to a motor, which comprises a shell and a rotor rotatably connected to an inner cavity of the shell, the rotor comprises a yoke part and a plurality of tooth parts, the plurality of tooth parts are uniformly connected to the outer peripheral surface of the yoke part around the axis of the yoke part at intervals, and tooth grooves for winding coils are reserved between the adjacent tooth parts. The planes, facing the tooth grooves, of every two adjacent tooth parts are parallel to each other. Through the arrangement of the yoke parts and the tooth parts and the design of parallel planes, the distribution of radial force waves in the circumferential direction is more symmetrical, part of the force waves are mutually offset, the excitation effect on the stator core is reduced, the interaction force between the rotor teeth and the stator slots is reduced, and the cogging torque is reduced, so that the vibration and noise of the motor are reduced, and the service life of the motor is prolonged. And normal use of the motor by a user is ensured.