30results about How to "Increased torque density" patented technology

The invention discloses an axial flux permanent magnet synchronous reluctance motor rotor based on modular harmonic counteracting, the rotor is designed in a three-in-one mode of structure modularization, magnetic barrier gradient and phase computable dislocation, a rotor assembly is formed by splicing N fan-shaped rotor modules along the circumference, and the adjacent modules are provided with optimal dislocation angles calculated according to the harmonic counteracting principle. The sum of target harmonic magnetic field vectors generated by each module is zero; a U-shaped magnetic barrier array of which geometric parameters are monotonically changed in a gradient manner is arranged in the fan-shaped rotor module, and a permanent magnet group is embedded in the fan-shaped rotor module; main electromagnetic harmonic waves are offset from the source, magnetism gathering and resistance increasing functions are decoupled, the mechanical robustness and the electromagnetic performance of the motor are improved, meanwhile, overall machining is converted into standardized module assembling, the manufacturing cost and the maintenance difficulty are reduced, different motor pole numbers can be flexibly adapted, and the service life of the motor is prolonged. The method is suitable for high-end application scenes such as new energy automobiles, industrial driving and aerospace.

The utility model discloses a high-torque-density magnetic transmission speed reducer and a built-in motor of a power-assisted bicycle, and belongs to the power-assisted technology of bicycles. A magnetic transmission speed reducer and a motor in the prior art have the defects of large torque fluctuation, low transmission efficiency, easy magnetic field mismatch, uncontrollable eddy current loss and the like, the magnetic transmission speed reducer comprises a first stator, a first rotor and a modulation ring, the modulation ring is located between the first rotor and the first stator, a first air gap is kept between the modulation ring and the first stator, and a second air gap is kept between the modulation ring and the second stator. A second air gap is kept between the modulation ring and the first rotor, the modulation ring comprises modulation teeth, the total number of the modulation teeth is p2, the number of pole pairs of the first stator magnetic ring is p3, the number of pole pairs of the first rotor magnetic ring is p1, p1 = p2-p3, a magnetic field of the first air gap is coupled with a magnetic field of the second air gap, and rotation from the first rotor is output in a speed reduction mode through the modulation ring. The motor part and the reduction gear realize transmission through magnetic force, thereby improving the motor operation efficiency and reducing the overall noise of the motor.

The application relates to the technical field of mechanical arms, in particular to a high-integration-degree mechanical arm joint module which comprises a control unit, a coding unit, a core driving unit, a speed reduction unit, a bearing unit, a torque feedback unit, a crankshaft and a shell assembly; the bearing unit comprises a bearing inner ring, a bearing outer ring, steel balls and a sealing ring which are coaxially arranged, the bearing inner ring is provided with an outer groove matched with the steel balls on an outer wall, and the bearing outer ring is provided with an inner groove corresponding to the outer groove on an inner wall; the bearing inner ring is provided with an inner ring clamping groove for clamping the sealing ring at a position close to an end portion, and the bearing outer ring is provided with an outer ring clamping groove corresponding to the inner ring clamping groove at a position close to an end portion. The application has the effects of realizing the synergistic optimization of high torque density and low friction loss in a limited space, reducing the volume of a sealing structure and improving the integration degree of the module.

This invention belongs to the field of motor technology and discloses a high-linearity finite-angle torque motor, comprising a cylindrical rotor and a cylindrical stator, with the rotor housed within the stator. The stator includes N coils and N constant magnetic circuit channels, where N is an even number of at least 2. The rotor's magnet portion has N polarities. The N coils of the stator are evenly arranged circumferentially on the inner side of the stator, with adjacent coils separated by constant magnetic circuit channels. The ends of all coil frames and the ends of the constant magnetic circuit channels together form the rotor's rotational track. Adjacent stator coils have opposite polarities after being energized, and adjacent rotor magnets also have opposite polarities. This invention employs a special stator lamination structure, theoretically eliminating stator cogging torque within the motor's operating angle range, thus improving the linearity of the motor's output torque. Compared to traditional slotted finite-angle torque motors, the output torque fluctuation is reduced by more than 70%.

The application belongs to the technical field of vehicle braking system, and discloses a segmented pole arc motor for an electronic mechanical braking system, a use method and a vehicle.The motor comprises a stator and an inner rotor, the stator adopts a split tooth structure, is provided with an alternating current armature winding and a direct current excitation winding, and the rotor is provided with segmented pole arc permanent magnets, so that the motor forms a hybrid excitation structure in which a permanent magnet magnetic field and an excitation magnetic field are superposed.Through segmented optimization of the pole arc of the permanent magnet, the air gap magnetic flux waveform is improved, the cogging torque and torque ripple are reduced, and the running stability is improved; equivalent flux linkage is controlled by adjusting the excitation current, the no-load speed is improved in the braking gap elimination stage, and the armature current and the locked-rotor copper loss are reduced in the clamping force following and maintaining stage.The cogging torque, torque ripple and locked-rotor copper loss are reduced in the structural level and the control level, and the application is suitable for stable and reliable work of the electronic mechanical braking system under various working conditions.

The invention provides an axial magnetic flux electric joint module system for an assembly modular robot, which comprises a plurality of functional assemblies, and the plurality of functional assemblies comprise a driver assembly, an encoder assembly, a brake assembly, an axial magnetic flux motor assembly, a speed reducer assembly and a torque sensor assembly, each functional assembly comprises a shell, a functional device, an electrical connector and a mechanical connection structure, the functional device and the electrical connector are both installed on the shell, the mechanical connection structure is arranged on the functional device, the functional device is used for achieving the function corresponding to the target functional assembly, and the mechanical connection structure is used for achieving the function corresponding to the target functional assembly. The electrical connector is used for realizing current bridging and signal transmission among the functional components, the mechanical connection structure is used for physical structure connection among the functional components, and the plurality of functional components are stacked in sequence to form the joint module system.

The present application belongs to the technical field of motor design, and more particularly relates to an alternating pole vernier permanent magnet motor based on a harmonic modified rotor and a magnetic barrier stator. Specifically, it comprises a rotor and a stator, the rotor is coaxially arranged in the stator, the pole of the rotor core adopts a harmonic modified directional design, the air gap permeance distribution is optimized to suppress non-working harmonics, and at the same time, the inter-pole leakage is reduced and the permanent magnet flux density fundamental amplitude is improved; and the magnetic barrier embedded in the stator tooth is used to block the low-order non-working harmonic path in the armature flux density, so as to weaken the amplitude. The present application solves the problem that the current motor simply applies the Halbach permanent magnet array to only realize the enhancement of working harmonics, ignores the non-working harmonics existing in the air gap, and fails to realize the full utilization of permanent magnets, resulting in the problems of low torque density and high manufacturing cost of the current alternating pole vernier permanent magnet motor.

The application discloses a high-torque-density double-winding permanent magnet motor based on a magnetic gear effect and relates to the technical field of motors.The application comprises a stator core, a fundamental wave winding, a harmonic wave winding, a modulation unit and a permanent magnet rotor; a half-closed slot is formed in the inner surface of the stator core, two sets of windings which are not coupled and have different pole pairs are placed in the slot, one set of the windings is the fundamental wave winding, and the other set of the windings is the harmonic wave winding; the modulation unit is composed of non-magnetic blocks and magnetic blocks which are alternately arranged along a circumference, is connected with the inner surface of the stator core, and only an air gap exists between the modulation unit and the permanent magnet rotor; the permanent magnet rotor is a magnetic gathering type permanent magnet rotor and comprises a tangential excitation permanent magnet and a magnetic separation slot structure. The two sets of windings can efficiently utilize the harmonic magnetic field and the fundamental wave magnetic field, the independent modulation unit is adopted to realize the optimal modulation ratio of the motor, the single air gap structure is beneficial to improving the working magnetic density of the motor, and the torque density of the motor driving system is effectively increased.

The invention belongs to the technical field of motor equipment, and particularly relates to a reluctance-assisted permanent magnet vernier motor. The magnetic resistance auxiliary type permanent magnet vernier motor comprises a stator structure which comprises a stator iron core with a mounting cavity, an armature winding and a plurality of first permanent magnets, and the first permanent magnets are located in a stator notch and arranged at intervals in the circumferential direction of the stator iron core; the rotor structure comprises a rotor iron core located in the mounting cavity and a rotor shaft connected with the rotor iron core, and a gap is formed between the side surface of the rotor iron core and the inner wall of the mounting cavity; the edge of the rotor core is provided with a plurality of magnetic barrier groups for generating reluctance torque, the plurality of magnetic barrier groups are arranged at intervals along the circumferential direction of the rotor core, the side surface of the rotor core is also provided with a plurality of rotor slots for generating permanent magnet torque based on a magnetic field modulation effect, and the plurality of rotor slots are also arranged at intervals along the circumferential direction of the rotor core. Through effective superposition of the permanent magnet torque and the reluctance torque, the overall torque density and the output torque of the motor are improved.

The invention relates to a compressor which comprises a crankshaft, a rotor and an oil-gas separation piece. The rotor is connected to the crankshaft and comprises a fluid through hole. The oil-gas separation part comprises an oil-gas separation part, a first oil collecting part and a first valve, the oil-gas separation part comprises a fluid inlet, a first cavity, a first flow channel, a second flow channel, a second cavity, a fluid outlet, a first oil catching structure and a second oil catching structure, and the first cavity comprises a first sub-cavity and a second sub-cavity which are communicated through the first flow channel; the fluid inlet is communicated with the first sub-cavity, the second runner is communicated with the second sub-cavity and the second cavity, the fluid outlet is communicated with the second cavity, the first runner is arranged away from the crankshaft in the radial direction of the rotor, and the second runner is arranged close to the crankshaft; the first oil catching structure is arranged in the second sub-cavity, the second oil catching structure is arranged in the second cavity, a first oil collecting part is arranged on the bottom wall of the oil-gas separation part, the first valve is connected to the bottom wall of the oil-gas separation part, and the first valve controls the first oil collecting part to be opened or closed.

This utility model discloses a vernier permanent magnet motor, including a stator assembly and a rotor assembly surrounding the stator assembly. The stator assembly includes a stator core and stator windings. The stator core includes a main shaft, a plurality of stator main teeth evenly distributed circumferentially around the main shaft, and at least two auxiliary teeth formed at the end of each stator main tooth opposite to the main shaft. The stator windings include a first coil winding wound on the stator main teeth and a second coil winding wound on the auxiliary teeth. The working magnetic field generated by the first coil winding and the second coil winding has the same phase, while the non-working magnetic field has opposite phase. The vernier permanent magnet motor of this application can simultaneously achieve high torque density and anti-saturation capability, which is beneficial for the widespread application of the motor.

The application relates to the technical field of electric drive transmission equipment, and discloses a multi-stage planetary rotor group large-torque direct drive system and a control and assembly method thereof. The sealed high-strength load-bearing shell is integrally cast and has a completely closed high-pressure sealed cavity formed by being enclosed inside. The single-field excitation stator assembly is fixed to the inner wall of the load-bearing shell through a hot-pressing process, the stator core is uniformly provided with embedded grooves in the circumferential direction, three-phase distributed excitation windings are wound in the grooves, and the winding ends are subjected to insulation curing treatment. The axial multi-stage planetary rotor assembly is coaxially arranged along the central axis of the whole machine. The single-stator axial multi-stage planetary rotor coaxial series connection, magnetic field coupling and mechanical planetary composite transmission structure are adopted, the rotors at all stages share the same central output main shaft to realize step-by-step superposition of the torque, and the inter-stage non-magnetic-conducting magnetic shielding ring completely blocks the magnetic field cross talk. Compared with the combination of a traditional permanent magnet motor and an external speed reducer, the torque density, transmission efficiency and structural integration degree are significantly improved.

This invention discloses a high torque density magnetic harmonic reducer axial permanent magnet servo motor. The axial field-modulated motor includes a stator, a left rotor, a right rotor, permanent magnets, and armature windings. The radial magnetic harmonic reducer includes a stator, an outer rotor, an inner rotor, permanent magnets, and ball bearings. This invention integrates the stator of the magnetic harmonic reducer with the stator of the field-modulated motor, directly connecting them and eliminating the mechanical reducer structure of traditional servo systems, effectively reducing the overall weight of the servo system. The field-modulated motor uses an axial structure to improve the torque density of the servo system. The magnetic harmonic reducer uses a radial structure embedded in the hollow space inside the field-modulated motor to achieve a lightweight, highly integrated servo system design. Both the field-modulated motor and the magnetic harmonic reducer use surface-mounted permanent magnet structures to reduce torque ripple.

The invention discloses a multi-degree-of-freedom spherical motor mechanism based on gear meshing transmission. The multi-degree-of-freedom spherical motor mechanism comprises a motor base, one or two pitching motors, one or two rolling motors, a cylindrical body with a main output shaft and two arched supporting frames. The outer sides of the two ends of the two arch-shaped supporting frames are fixedly connected with connecting shafts, the inner sides of at least one ends of the two arch-shaped supporting frames are correspondingly and fixedly connected with shells of the pitching motor and the rolling motor, and the two arch-shaped supporting frames are rotationally connected with the motor base through the connecting shafts. Output shafts of the pitching motor and the rolling motor are fixedly connected with gears; at least two arc-shaped racks are arranged on the cylindrical body; two adjacent arc-shaped racks are perpendicular to each other by planes determined by respective center arc lines and circle centers, and an output shaft gear of the pitching motor is correspondingly meshed and matched with one arc-shaped rack; an output shaft gear of the rolling motor is correspondingly meshed and matched with the other arc-shaped rack; the centers of the arch tops of the two arch-shaped supporting frames are both open, and the main output shaft on the cylindrical body extends out of the openings in the centers of the arch tops of the two arch-shaped supporting frames. The invention is easy to manufacture and assemble.

The invention provides a double-disc-double-ring stator hybrid magnetic flux permanent magnet motor. The double-disc-double-ring stator hybrid magnetic flux permanent magnet motor comprises a double-disc-double-ring stator, H-shaped block iron cores I, II and III, an outer rotor I and II, a middle rotor, an annular winding and a direct cooling water jacket, three types of H-shaped block iron cores I, II and III are arranged by using silicon steel lamination structures in three shapes, and the double-disc-double-ring stator is of an integrated combined structure of the three types of H-shaped block iron cores I, II and III. The double-disc stator I and the double-disc stator II are respectively provided with an inner ring stator I and an outer ring stator I and an outer ring stator II, and the double-disc-double-ring stator support is arranged in the middle of an inner ring between the inner ring stator I and the inner ring stator II. A middle rotor is arranged between the double-disc stator I and the double-disc stator II, and an outer rotor I and an outer rotor II are arranged outside the double-ring stator I and the double-ring stator II. An endless annular winding is adopted, and a direct cooling water jacket is arranged on the periphery of the annular winding. A direct cooling water jacket, a stator bracket and a stator periphery constraint are arranged by using a heat-conducting carbon fiber-resin composite material. By using the structure, the torque density of the motor is improved.

The application relates to the technical field of robots, in particular to a joint module, a mechanical arm and a robot. The joint module comprises a speed reduction assembly, a driving assembly and an integrated structure, and the driving assembly is connected with the speed reduction assembly. The driving assembly and the speed reduction assembly are both connected with the integrated structure, and the integrated structure is configured to control the driving assembly to drive the speed reduction assembly to rotate at a reduced speed and detect the positions of the driving assembly and the speed reduction assembly. The joint module, the mechanical arm and the robot provided by the application reduce the axial size of the joint module and improve the torque density of the joint module.

This invention relates to the field of transverse flux motor technology, and more particularly to a miniature transverse flux motor, comprising a motor housing and an electromagnetic core assembly. The electromagnetic core assembly includes a first stator core, a second stator core, and a magnetic ring disposed between the first and second stator cores. Both the first and second stator cores include several horseshoe-shaped stator blocks arranged in a circular pattern, and each stator core contains a coil winding. The magnetic ring includes a rotor body, a shaft, and permanent magnets. The shaft is coaxially fixed to the center of the rotor body, and the permanent magnets are evenly distributed at equal angles along the circumference of the rotor body. This invention employs a transverse flux structure with upper and lower double stators and a central magnetic ring. During operation, this is equivalent to two motors working collaboratively, significantly increasing the motor's output torque within the constraints of a miniature structure, effectively solving the problem of insufficient torque in existing miniature stepper motors and coreless motors.

This invention discloses a two-degree-of-freedom spherical motor with a high deflection range. The motor includes a base with a hollow housing, two pairs of motor mechanisms, two arc-shaped guide rails, and an output device connected sequentially. The output shafts of each pair of motor mechanisms coincide. The output shafts of the two pairs of motor mechanisms extend outside the hollow housing and are rotatably connected to it. The output shafts of the two pairs of motor mechanisms intersect perpendicularly at the rotation center point. The two arc-shaped guide rails are stacked vertically, with their ends fixed to the ends of the output shafts of the two pairs of motor mechanisms. The output device has a transmission part that is slidably connected to both arc-shaped guide rails and a connecting part for connecting to external devices. When the output shafts of the two pairs of motor mechanisms rotate, the transmission part of the output device drives its connecting part to move on a spherical surface centered at the rotation center point, achieving pitch and yaw. This invention is suitable for applications such as robot wrist joints and astronomical observation, requiring high-deflection-range pitch and yaw drive control.

The application discloses a variable magnetic guide stator structure and an axial flux permanent magnet motor, and the variable magnetic guide stator structure comprises a stator yoke part, a stator tooth part, a stator tooth shoe and a stator winding, the stator yoke part is provided with wedge-shaped grooves distributed in a ring shape, the stator tooth part is radially assembled to the stator yoke part through matched wedge-shaped bosses, the stator tooth part is provided with triangular grooves on both sides, the stator tooth shoe is embedded between adjacent stator tooth parts through parallelogram bosses, and the three are radially embedded to form a modular stator structure, the stator iron loss is reduced through modular assembly and differential material matching, the air gap magnetic field is actively regulated and controlled by relying on the variable magnetic guide tooth shoe, torque pulsation is effectively inhibited, axial magnetic pulling forces can be offset by the symmetrical layout of the double stator, the double stator has the characteristics of high torque density and wide power domain efficient operation, and is suitable for new energy automobile, wind power and other scenes.

The invention discloses a method and system for determining a short-circuit demagnetization checking scene of a permanent magnet wind driven generator, and relates to the technical field of permanent magnet wind driven generators, and the method comprises the steps: obtaining a joint probability density function of the wind speed of a target wind field and the environment temperature; determining a plurality of candidate check scenes according to the joint probability density function; respectively calculating the output power of the permanent magnet wind driven generator after the short-circuit fault occurs in each candidate checking scene; constructing an expected value equation based on the joint probability density function and the output power; and solving the expected value equation, and determining the candidate check scene corresponding to the wind speed value and the environment temperature value satisfying the equation as a final short circuit demagnetization check scene. According to the method, the problems that the design of the permanent magnet wind driven generator is too conservative and the power density improvement is restricted due to the fact that a minimum probability scene is adopted as a checking reference in the prior art are solved, and the power density of the permanent magnet wind driven generator can be effectively improved on the premise that the overall output reliability is ensured.

The invention provides a rotor of a two-pole synchronous reluctance motor and the two-pole synchronous reluctance motor. The rotor comprises a radial magnetic flux rotor iron core which is coaxially arranged with a transmission shaft of the two-pole synchronous reluctance motor. A plurality of magnetic isolation grooves which extend in the d-axis direction of the rotor and penetrate through the rotor iron core in the axial direction of the rotor are formed in the rotor iron core, and the lamination plane of the rotor iron core comprises a first area overlapped with the projection of the transmission shaft in the d-axis direction of the rotor; the magnetic isolation grooves, located in the first area, in the multiple magnetic isolation grooves are filled with a conductive material. Compared with a traditional asynchronous starting dipolar ferrite permanent magnet synchronous reluctance motor, the dipolar ferrite permanent magnet synchronous reluctance motor and the rotor of the dipolar ferrite permanent magnet synchronous reluctance motor have the advantages that the starting capability and locked-rotor torque of the motor are obviously improved, the average torque and power density can be improved, the power factor of the motor is improved, and the efficiency of the motor is improved.

The application relates to the motor technical field and provides a motor and controller integrated driving system, which comprises a driving motor, a motor end cover and a rotor assembly, the rotor assembly comprises a rotating shaft and a hybrid rotor installed on the rotating shaft, a controller, the controller comprises a first shell, a second shell, a control module and a rotor position detection device, the first shell and the second shell are arranged on one side of the motor end cover and jointly enclose a containing space together with the motor end cover, the control module and the rotor position detection device are arranged in the containing space, the hybrid rotor comprises a synchronous reluctance rotor section and a permanent magnet rotor section arranged along the axial direction of the rotating shaft, the synchronous reluctance rotor section and the permanent magnet rotor section have the same number of poles, the outer diameter r1 of the synchronous reluctance rotor section is larger than the outer diameter r2 of the permanent magnet rotor section, and 0.5mm < r1-r2 < 0.7mm is met. The overall structure is compact, the torque density is high, the power factor is large, the efficiency is high and the cost is reduced.

This utility model discloses a double-layer stator module and a double-layer stator permanent magnet motor. The double-layer stator module includes two stator units and multiple elongated components. Each stator unit includes an injection-molded base plate, multiple iron core components, and multiple coil windings. Each iron core component is integrally connected to the injection-molded base plate through injection molding and is arranged sequentially at intervals along the circumference of the injection-molded base plate. The multiple coil windings are wound one-to-one around the periphery of each iron core component. Each iron core component abuts against each other along the axial direction to form multiple iron core groups arranged sequentially at intervals along the circumference. An assembly cavity is defined between each two adjacent iron core groups. Each elongated component is inserted into its respective assembly cavity. The elongated component has a drainage channel along its length for oil flow. This application utilizes oil for efficient cooling while simplifying the structure of the stator unit and elongated components, reducing molding difficulty, and minimizing impact on the normal operation of the entire machine, ultimately contributing to improved operational reliability.

The utility model provides a kind of motor cooling structure and the permanent magnet motor comprising it.The motor cooling structure includes: first radiating passage, the first radiating passage extends along the axial direction of rotor, the first radiating passage is communicated with stator and the air gap of the rotor, the both ends of the first radiating passage are provided with multiple air inlets, multiple the air inlets are distributed on the first radiating passage along the circumferential direction;Second radiating passage, the second radiating passage is communicated with the first radiating passage, the second radiating passage is annularly arranged on the outer circumferential side of the rotor along the radial direction of rotor and is communicated with the air gap of the stator and the rotor, and the second radiating passage includes air outlet;Radiating portion, the radiating portion is arranged at the air outlet.

The invention belongs to the technical field of power transmission, and discloses a transmission mechanism which is characterized in that at least one first screw channel arranged in the rotating circumferential direction is arranged in a first annular raceway, and at least one second screw channel arranged in the rotating circumferential direction is arranged in a second annular raceway; the rotor is clamped between the first annular roller path and the second annular roller path, the rotor is connected to the base body in a stopping and limiting mode in the circumferential direction of the first axis, the rotor has the rotational freedom degree along the axis of the rotor relative to the base body, and the transmission part is matched with the first screw path and the second screw path; when at least one of the first transmission part and the second transmission part rotates relative to the base body, the other transmission part is driven by the rotor to rotate. According to the invention, the meshing backlash caused by tooth-shaped transmission can be avoided, and the power transmission efficiency and stability are effectively improved. The invention further discloses a transmission assembly, a vehicle and a robot.

This invention discloses a short-pitch, multi-layer, integrally molded flexible winding and a high torque density permanent magnet motor, comprising 2 n One conductive layer, 2 n - One substrate layer, two coating layers, interlayer conductive connection hole one, and interlayer conductive connection hole two; 2 n Each conductive layer includes interleaved layers. n An odd number of conductive layers and n An even number of conductive layers; each conductive layer is uniformly distributed circumferentially. k × m Each single coil group is arranged in a continuous loop from the outside to the inside in the odd-numbered conductive layers; each single coil group in the even-numbered conductive layers is arranged in a continuous loop from the inside to the outside. When n > 1, the outer tail end of the even-numbered layer coil is electrically connected to the outer head end of the corresponding odd-numbered layer coil in the next adjacent odd-numbered conductive layer through an interlayer conductive connection hole. Based on the requirements of the splicing interface for the solder joints, this invention selects either a star connection or a delta connection. This invention can improve the motor torque density while eliminating motor cogging, effectively suppressing the nonlinear characteristics of the motor, and improving accuracy under all operating conditions, thus achieving a high-efficiency, lightweight, and miniaturized design for permanent magnet motors.

The invention relates to a wall-climbing robot for welding seam detection, and belongs to the technical field of pipeline welding seam detection, the wall-climbing robot comprises a front frame, a rear frame, a connecting piece and a laser scanning module, front permanent magnet motor wheels are rotatably arranged on the two sides of the front frame respectively, and rear permanent magnet motor wheels are rotatably arranged on the two sides of the rear frame respectively; the connecting piece is rotationally connected with the front frame by taking the height direction as an axis through the first rotating shaft and is rotationally connected with the rear frame by taking the advancing direction as an axis through the second rotating shaft, so that the whole device can flexibly twist like a spine when spanning the surplus height of a welding seam or the surface of a pipeline is distorted and deformed; the two front permanent magnet motor wheels and the two rear permanent magnet motor wheels are ensured to be in reliable contact with the surface of the pipeline all the time, and the two front permanent magnet motor wheels and the two rear permanent magnet motor wheels can converge inwards in a self-adaptive mode like claws to tightly hold the surface of the pipeline in the advancing process. Therefore, the adsorption stability and trafficability of the pipeline welding seam detection device on a small-curvature-radius complex curved surface are remarkably improved.

This application provides an oil-cooled powertrain and an electric vehicle. The oil-cooled powertrain includes a housing, a motor, and a drive shaft. The housing includes a motor slot and an end cover. The motor slot accommodates and secures the motor stator, and the end cover encloses the motor slot. One end of the motor shaft extends into the motor slot, and the other end extends out of the motor slot and is connected to the drive shaft of a reducer. The motor shaft and the drive shaft are arranged in parallel, and the drive shaft is used to drive the differential of the reducer. One end of the drive shaft extends out of the motor slot through the shaft cavity of the motor shaft and is connected to the differential; the other end is connected to the wheel of the electric vehicle. Cooling oil passages are formed by the motor shaft cavity and the drive shaft at radial intervals along the motor. The end cover includes a mounting groove for mounting an annular oil guide plate. The oil inlet of the annular oil guide plate receives cooling oil output from the internal flow channel of the end cover, and the oil outlet of the annular oil guide plate delivers cooling oil. This design improves motor performance and increases the driving range of the electric vehicle.

This invention discloses a heat-dissipating stator module for a direct-drive motor, comprising a stator core, several winding slots arranged radially outside the stator core, and coil windings wound within the winding slots. It also includes a heat-dissipating stator base in thermal contact with the stator core. Heat pipes are disposed within the winding slots, with the evaporation sections of the heat pipes in thermal contact with both the stator core and the coil windings, and the condensation sections of the heat pipes extending to and in thermal contact with the heat-dissipating stator base. Simultaneously, a jointed direct-drive motor is also disclosed, comprising a heat-dissipating stator module and a rotor module. The rotor module includes a rotor shaft and a rotor magnet assembly. The rotor magnet assembly is located radially outside the stator core and coaxially arranged with it. The rotor shaft is rotatably connected to the heat-dissipating stator base and coaxially arranged with the stator core. The rotor shaft and the rotor magnet assembly are connected by a connecting bracket. This invention possesses highly efficient heat dissipation performance and thermal reliability, enabling the motor to withstand longer and higher-intensity peak torque operation.

The utility model relates to the technical field of motors for electric vehicles, in particular to a hub motor for an electric vehicle, which is characterized in that a stator core is fixedly mounted on a motor shaft and comprises a left iron core and a right iron core which are integrally formed, the left iron core is alternately provided with a plurality of first stator teeth and a plurality of first stator grooves along the circumferential direction, and the right iron core is provided with a plurality of second stator teeth and a plurality of second stator grooves; the right iron core is alternately provided with a plurality of second stator teeth and a plurality of second stator grooves in the circumferential direction, notches of the first stator grooves and notches of the second stator grooves face the two axial sides of the motor shaft, the first coil winding is wound around the first stator teeth, the second coil winding is wound around the second stator teeth, the left rotor magnetic steel is installed in the left end cover, and the right rotor magnetic steel is installed in the right end cover. And the right rotor magnetic steel is arranged in the right end cover and corresponds to the right iron core. A rotor-stator-rotor structure is adopted, and a stator core adopts an axial double-groove type and is designed corresponding to double rotors and double magnetic steel groups, so that double-power axial output is realized, and the torque and the power density of the motor are remarkably improved.