803 results about "Permanent magnet rotor" patented technology

The invention discloses a method and a device for controlling magnetizing uniformity of a permanent magnet rotor, relates to the technical field of permanent magnet rotors, and aims to evaluate the risk of uniformity during magnetizing of the permanent magnet rotor in advance and provide effective early warning for magnetizing operation by analyzing temperature change data, shape data and surface defect data and constructing a magnetic field response capability coefficient. Based on monitoring of the internal magnetic domain data and the magnetic data of the permanent magnet rotor in the step S3, the magnetic field stability of the rotor can be dynamically analyzed in combination with the influence of an external magnetic field generated by a magnetizing source on magnetic domain alignment. The comprehensive magnetic performance stability index is generated by comprehensively considering the magnetic field response capability coefficient and the magnetizing state prediction model, and a scientific basis is provided for control and optimization in the subsequent magnetizing process. Intelligent control and optimization are carried out, grade scoring is carried out by setting a risk threshold value R and combining the comprehensive magnetic performance stability index, the magnetizing operation effect can be accurately evaluated, and corresponding control measures are taken under different grades.

The invention discloses a permanent magnet rotor surface-mounted magnetic steel mounting structure and method, and belongs to the technical field of motors, the permanent magnet rotor surface-mounted magnetic steel mounting structure comprises a rotor, a magnetic steel guide assembly is arranged above the rotor, the magnetic steel guide assembly comprises a plurality of pieces of simulation magnetic steel, the magnetic steel guide assembly is used for mounting magnetic steel to be mounted, and a mounting assembly is arranged at the bottom of the rotor. A plurality of locking assemblies are arranged on the mounting assembly, a plurality of magnetic steel mounting parts are arranged on the rotor, magnetic steel and a magnetic yoke before mounting are separated through a magnetic steel guide assembly tool, in the matching process of the magnetic steel and the magnetic yoke, the hand is evacuated to a safe position, safety risks are avoided, a magnetic steel pushing mode is not adopted, adsorption is prevented through a non-magnetic-conductive material, and the magnetic steel is prevented from being damaged. Glue pressing is used for replacing glue pushing, smooth installation of the surface-mounted magnetic steel is achieved, material loss is avoided, and the phenomenon that poor installation is prone to occurring in the mutual exclusion process of the magnetic steel, and the performance of a motor is affected is avoided.

The invention provides an axial magnetic field modulation type magnetic gear applying a T-shaped modulation ring structure, which belongs to the field of motors and comprises a high-speed permanent magnet rotor, a low-speed permanent magnet rotor and a T-shaped modulation ring. The modulation ring comprises a plurality of T-shaped magnetic modulation pole pieces and T-shaped non-magnetic composite material pole pieces which are alternately arranged and bonded in the circumferential direction. The high-speed permanent magnet rotor and the low-speed permanent magnet rotor each comprise a rotor iron core composed of a plurality of rotor yokes, and N-pole permanent magnets and S-pole permanent magnets embedded between the adjacent rotor yokes in the circumferential direction. The high-speed permanent magnet rotor and the low-speed permanent magnet rotor coaxially sleeve the modulation ring on the two sides of the modulation ring respectively, and form radial and axial air gaps with the modulation ring. Leakage flux at the inner peripheral ends of the rotor yokes of the high-speed and low-speed permanent magnet rotors can enter the T-shaped modulation rings to be linked with magnetic flux generated by the corresponding rotor permanent magnets, the leakage flux at the inner peripheral ends of the rotor yokes on the two sides is reduced, the high-speed and low-speed rotors coaxially rotate, the air gap flux density can be increased, and therefore the gear output torque and the torque density are improved; meanwhile, the modulation ring is easy to process and compact in structure.

Provided in the present invention are a hybrid excited axial brushless motor and a power generation method thereof. The hybrid excited axial brushless motor comprises a housing and a rotating shaft rotatably fixed in the housing. Seven parts, i.e. a first exciter stator, a first magnetic shunt ring rotor, a first permanent magnet rotor, an armature stator, a second permanent magnet rotor, a second magnetic shunt ring rotor and a second exciter stator are successively mounted in the housing in the axial direction, air gaps being provided between every two adjacent parts. The first permanent magnet rotor and the second permanent magnet rotor are symmetrically arranged and are both rotatably fixed to the rotating shaft; the first magnetic shunt ring rotor and the second magnetic shunt ring rotor are symmetrically arranged and are both fixedly connected to the rotating shaft; the first exciter stator and the second exciter stator are symmetrically arranged and are both fixedly connected to the housing. By means of an armature stator support, the armature stator is fixedly connected to the housing. The present invention achieves brushless hybrid excitation, and increases the power density and the power generation capacity of motors.

The invention discloses a mechanical weak magnetic speed regulation permanent magnet motor, and belongs to the technical field of permanent magnet motors, the mechanical weak magnetic speed regulation permanent magnet motor comprises a motor body, two sides of the motor body are respectively provided with an exhaust hole group and an air inlet hole group, the interior of the motor body is rotatably connected with a rotating shaft, and the inner side wall of the motor body is symmetrically provided with stator discs; the surface of the rotating shaft is slidably connected with two symmetrically-designed permanent magnet rotors through sliding rails, and a plurality of coil assemblies are annularly designed on the side, close to the permanent magnet rotors, of the stator disc. According to the invention, when the rotating speed of the motor body is increased, the internal pressure change of the sealing cavity is controlled through the rotating speed change of the rotating shaft and the centrifugal force change of the sealing piston block and the balancing weight, so that the gap between the magnet and the coil assembly is hydraulically adjusted, no extra energy is needed, and the energy-saving effect is realized; and automatic field weakening control can be carried out according to the real-time rotating speed, so that the stability and the safety of the operation of the motor body are effectively ensured.

A permanent magnet rotor can include a rotor body and at least one magnet. The rotor body can include at least one rotor cavity. The at least one magnet includes, in part, Mn—Bi particles and the at least one magnet can be either a sintered magnet or a polymer bonded magnet. The at least one magnet can be located, at least partially, in the at least one rotor cavity. Further, the at least one magnet can be installed in the at least one rotor cavity after forming the at least one magnet or the at least one magnet can be formed in the at least one rotor cavity using a mold. Moreover, the polymer bonded magnet can include a composite of polymer matrix and Mn—Bi particles.

A permanent-magnet rotor for a permanent-magnet motor includes a laminated core, receiving pockets which are formed in the laminated core, and permanent magnets which are each accommodated in segmented form in one of the receiving pockets. The permanent magnets have at least one asymmetrically segmented permanent magnet, which is segmented only in an end region which is arranged facing away from an axis of rotation of the permanent-magnet rotor.

An axial flux motor water pump comprising a housing, a cover attached to the housing, a stator mounted within the housing, the stator comprising a plurality of stator poles mounted in a ring, each stator pole comprising an electric wire winding, a rotor journaled to the housing in cooperating relation to the stator on a single bearing, an impeller fixed to an end of the rotor, a plurality of magnets mounted to an end of the rotor in cooperative relation to the stator poles, a seal between the rotor and housing whereby the stator and magnets are in a dry zone, the stator enrobed in thermal potting within the housing; and power electronics contained in the cover. The rotor portion of the rotor may be manufactured in a sintering process.

The invention relates to the technical field of generators, in particular to a permanent magnet rotor generator for a vehicle, which comprises a motor main body, a rotating permanent magnet rotor arranged in the motor main body and a fixed winding stator annularly arranged outside the permanent magnet rotor, and the permanent magnet rotor comprises a motor shaft and a control cylinder fixedly sleeved on the motor shaft. The motor shaft and the winding stator are arranged in the control cylinder, the permanent magnet plates are evenly arranged outside the control cylinder, a reinforcing device and a lubricating mechanism are arranged between every two adjacent permanent magnet plates, the lubricating mechanism is used for supplying lubricating agents to the reinforcing devices, and the reinforcing devices are cushioned between the control cylinder and a thin cylinder annularly arranged in the winding stator. Radial vibration during rotation of the motor shaft is limited, lubrication of the reinforcing device is monitored and guaranteed through the lubricating mechanism, it is guaranteed that the winding stator and the reinforcing device which are in close contact can smoothly slide in a staggered mode, and power transmission heat dissipation of the windings is rapidly taken away by blowing air to gaps between the windings on the winding stator.

The invention relates to the technical field of energy-saving permanent magnet motors, and discloses a permanent magnet rotor system capable of guaranteeing ultra-high-speed stability, which comprises a permanent magnet rotor and a controller, and is characterized in that the controller injects current synthesized by fundamental waves and specific space harmonics into a stator winding on the basis of not depending on rotor radial position feedback, so that the permanent magnet rotor is controlled to rotate; an electromagnetic potential well with radial self-recovery force is constructed in an air gap of the motor; moreover, the controller also monitors the change rate of an internal torque instruction, foreseeably and instantaneously reinforces the potential well to resist impact, and synchronously corrects the fundamental current to eliminate parasitic torque pulsation associated with reinforcement. And the rotor stability is converted from a dynamic adjustment problem depending on external high-speed closed-loop control to an intrinsic constraint problem of motor self-guarantee, so that the risk of failure caused by signal delay at an ultra-high speed in traditional reaction type control is reduced.

Winding grooves are formed in a stator iron core in the circumferential direction, the winding grooves comprise outer-layer stator grooves on the yoke portion side and inner-layer stator grooves on the side close to a permanent magnet rotor, harmonic windings are embedded in the outer-layer stator grooves, and the harmonic windings are double-layer short-pitch windings; a fundamental wave winding is embedded in the inner-layer stator slot, and the fundamental wave winding is a centralized winding; a plurality of modulation teeth are arranged in the stator iron core along the circumferential direction in a non-equidistant manner; the number pf of pole pairs of the fundamental wave winding is consistent with the number pf of pole pairs of the permanent magnet rotor, the number ph of pole pairs of the harmonic wave winding is different from the number pf of pole pairs of the fundamental wave winding, and the number Ns of poles of the modulation teeth meets the condition that Ns = pf + ph, Ns = (1 + 2n) ph or Ns = (1 + 3n) ph. The technical defects that a traditional permanent magnet motor cannot utilize harmonic waves and a conventional magnetic gear effect permanent magnet motor cannot efficiently utilize harmonic waves and fundamental waves to do work can be overcome, the torque density of the motor is greatly improved while the power factor is not degraded, and the complexity, the system cost and the additional loss of a magnetic field modulation structure are reduced.

The invention discloses a stator permanent magnet type rotor skewed slot magnetic flux switching motor which comprises a motor stator which comprises a stator iron core, a plurality of main teeth and a plurality of auxiliary teeth are arranged on the inner side of the stator iron core in the circumferential direction at intervals in a staggered mode, and the number of the main teeth is the same as that of the auxiliary teeth; each main tooth and the adjacent auxiliary tooth form a wire embedding groove, a coil winding is arranged in each wire embedding groove, each main tooth is provided with a first set of permanent magnets, the end part of each auxiliary tooth is provided with a pole shoe, and the pole shoe is provided with a second set of permanent magnets; the motor rotor and the motor stator are coaxially arranged, a plurality of rotor teeth are arranged on the outer side of the motor rotor in the circumferential direction at intervals, and the number of the rotor teeth is an even number. According to the invention, the torque of the motor is improved, and the motor is suitable for application occasions with higher torque requirements under the same volume.

For interventional surgery, robot-assisted operation and image guidance are urgently required clinically. However, due to limitation of size, magnetic component interference and the like, tracking and positioning of magnetic imaging catheters in IVUS and OCT forms are difficult problems. The interventional imaging catheter, the six-degree-of-freedom positioning method, the six-degree-of-freedom positioning system, the six-degree-of-freedom positioning equipment and the medium are different from a magnetic positioning method of a transmission embedded sensor, and the interventional imaging catheter is compatible with a magnetic part in a permanent magnet rotor form. Meanwhile, in cooperation with a magnetic positioning search strategy for linearly solving an initial value, positioning of the catheter can be rapidly achieved.

The invention relates to a novel parallel pole-arc-changing hybrid excitation brushless synchronous generator, which comprises a first magnetic circuit, a second magnetic circuit and a third magnetic circuit, the first magnetic circuit is formed by an original stator permanent magnet rotor of the motor; corresponding hybrid excitation rotors are arranged on the left and right outer sides of the stator, and a second magnetic circuit is formed between the hybrid excitation rotors and the iron core of the stator; an excitation winding is further arranged on the outer side of the corresponding hybrid excitation rotor, and the excitation winding enables common teeth of the hybrid excitation rotor to be magnetized into different polarities, so that a third magnetic circuit for increasing or weakening magnetism is formed. The motor has the beneficial effects of wide rotating speed adjusting range, high power density and high efficiency.

The utility model discloses a three-phase three-layer multi-rotor motor structure and a wheel hub motor, the motor structure comprises three single-phase multi-rotor motor sets which are installed along the axial direction of a main shaft, each single-phase multi-rotor motor set is a 360-degree closed ring structure composed of a plurality of small motors, inner rotors and stators of the motor sets are alternately arranged, and two sides of each stator are provided with semicircular magnetic poles by taking a winding groove as a center. The permanent magnet rotor is coupled with stator semicircular magnetic poles on two adjacent sides to form a small motor; the rotors of the three motor sets are arranged in a one-to-one correspondence mode in the axial direction of the motors and coaxially connected in series through rotor through shafts, and the magnetic field directions of the rotors are sequentially staggered by 120 degrees. And the main shaft fluted disc is fixed on the main shaft, is used as a timing gear to be meshed with the pinions arranged on the rotor through shafts so as to drive the three motor groups to continuously operate, and is also used as a thrust gear to output motor torque. The hub motor provided by the utility model has the advantages of higher rotating speed, higher efficiency, smaller volume and lighter weight.

The invention discloses an asymmetric hybrid magnetic pole permanent magnet and electromagnetic hybrid excitation driving motor, which belongs to the technical field of automobile motor electric appliances, and comprises a fan, a front end cover, a rear end cover, a casing, a hybrid excitation rotor and a stator, the fan is arranged on one side of the rear end cover, and the casing is arranged between the front end cover and the rear end cover. The hybrid excitation rotor comprises a claw pole electric excitation rotor, a permanent magnet rotor with an asymmetric hybrid magnetic pole structure and a magnetic isolation bushing arranged between the claw pole electric excitation rotor and the permanent magnet rotor, the permanent magnet rotor comprises a rotating shaft, a rotor core and eight rotor magnetic poles, the rotor core is pressed on the rotating shaft, and the rotor magnetic poles are arranged on the rotor core. The asymmetric hybrid magnetic pole permanent magnet and electromagnetic hybrid excitation driving motor is low in harmonic content of the whole machine, high in output quality, large in magnetic adjustment range and good in voltage stabilization performance.

The invention belongs to the field of rotor design, particularly relates to a high-speed built-in permanent magnet rotor design method, system and equipment based on a stress analysis model, and aims to solve the problem that the structural strength and electromagnetic performance of a high-speed built-in permanent magnet synchronous motor rotor are difficult to collaboratively optimize in the prior art. The method comprises the steps of determining the axial length and the outer diameter of a rotor according to a motor torque demand and an assembly space, and ensuring that a critical rotating speed is higher than a target limit value through dynamic verification; decomposing the rotor into pole shoe, permanent magnet and slotting areas, calculating centrifugal force in different areas, and superposing to obtain a total load; establishing a corresponding stress boundary equation set for a non-magnetic bridge, single / combined magnetic bridge or sheath composite structure; and solving the equation set based on the target rotating speed, and synchronously optimizing the sheath thickness, the magnetic bridge width and the interference magnitude parameter by using the intersection point of the isorotation speed line and the electromagnetic-mechanical characteristic curve. The problem of contradiction between size parameters and performance in traditional design is solved, and calculation efficiency and precision are both considered.

An electric machine having a shaft, a rotor with a magnetic core comprising a series of stacked laminations and a plurality of seats oriented axially, a plurality of magnetic poles, each having two permanent magnets, and a stator. The magnetic core comprises first laminations alternated with different second laminations, with at least ten second laminations interposed between two first laminations. Each first lamination has, for each seat, two first fixing blades, which are parallel to each other, and arranged on the same side of the first seat and bent by 90° against a same larger side wall of a corresponding permanent magnet, and also has, for each seat, a second fixing blade, which is oriented perpendicular to the corresponding first fixing blades and bent by 90° against a smaller side wall of a corresponding first permanent magnet. Each second lamination lacks fixing blades bent against the corresponding permanent magnet.

The utility model relates to the technical field of power generation, in particular to a power generation device for a high-pressure pipeline, which comprises a shell, the shell is provided with a water outlet and a water inlet on the side surface, and a base is arranged at one end of the shell; a Tesla turbine disc is arranged in the shell and is opposite to the water inlet; a bearing support is arranged in the shell, and the Tesla turbine disc is connected to the bearing support through a rotating shaft; a permanent magnet rotor is arranged at the end, away from the water outlet, of the rotating shaft, a stator plate is arranged on the shell or the base, a water stop plate is arranged between the stator plate and water flow in the shell, and the stator plate and the shell are arranged in an insulated mode. The device can be applied to a high-pressure pipeline to realize self power generation and has the advantage of high water pressure bearing capacity.

A rotor for an electric machine that is formed of a shaft onto which are mounted a plurality of permanent magnets. The shaft has one or more axial grooves formed in the radial outer surface of the shaft. The grooves extend longitudinally along a least a partial longitudinal length of the shaft.

The invention discloses a split embedded magnetic circuit optimization design process, and belongs to the technical field of motor design and manufacturing. According to the invention, a split embedded magnetic circuit optimization design process is adopted, and the embedded combination design of a high-resistance magnetic material and a high-permeability magnetic material is utilized, so that the cogging torque of the motor and the magnetic isolation groove structure of the permanent magnet rotor can be effectively improved, the magnetic circuit is optimized, the magnetic leakage is reduced, and meanwhile, the mechanical property is ensured.

A liquid pump with a housing in which a wound stator and electronics are arranged in a dry area. A permanent magnet rotor is arranged in a wet area. A shaft is held on the one hand in a pump head and on the other hand in a shaft receptacle in a containment shell. The containment shell separates the dry area from the wet area. At least one bearing is incorporated in the permanent magnet rotor and is arranged rotatably on the shaft, wherein the permanent magnet rotor comprises a plastic insert and a permanent magnet, and at least one fluid channel runs parallel to the axis and is formed between the plastic insert and the permanent magnet.

The invention provides a rotor punching sheet of a high-efficiency permanent magnet synchronous motor, and relates to the technical field of permanent magnet synchronous motors. The rotor punching sheet provided by the invention is designed according to the following steps: according to symmetry, one pole of the motor rotor punching sheet is designed to be a sector, the unfolding angle of the sector is 180 / p degrees, and p is the number of pole pairs; the center axis of the sector, the boundary straight line and the inner arc line of the motor stator are taken as the reference, the boundary position of the hole is drawn by adopting a geometric construction method, the formed hole is used for inserting the permanent magnet with the rectangular section, and the permanent magnets in the hole have the same specification. According to the invention, serialized high-efficiency permanent magnet rotor punching sheets can be rapidly designed, and the motor cost is reduced; the outer side area of the pole part is small, so that the stress of the rotor reinforcing rib is small; the linear permanent magnets are small in width, so that the flux density of the stator is reduced, and the iron loss of the stator is reduced; the permanent magnets with rectangular cross sections can be inserted into the rotor iron core formed by laminating the punching sheets, so that the manufacturing and mounting cost of the permanent magnets is reduced.

A multi-phase, multi-pole surface / interior permanent magnet motor / generator (S / IPM electric machine) is described, and includes a rotor disposed on a rotor shaft within an annular stator, and a plurality of interior and surface-mounted permanent magnets disposed in longitudinally-oriented pockets of the rotor.

The invention discloses a permanent magnet motor magnet performance degradation evaluation method, belongs to the field of permanent magnet motor tests, and is used for solving the technical problem that reversible demagnetization and irreversible demagnetization are difficult to effectively distinguish in the prior art. The method comprises the following steps: step 1, installing a selected adaptive permanent magnet rotor assembly on a motor installation seat of a test bed; 2, hardware debugging is completed; 3, test parameters are set, and a cooling module is started; 4, starting the to-be-tested permanent magnet motor according to a set rotating speed, gradually applying a load by a loading device according to a test requirement, and monitoring the running state of the motor in real time; step 5, collecting performance data of the permanent magnet motor to be tested according to a preset sampling frequency; step 6, repeating the steps 2-5 to carry out a cyclic test, wherein the cumulative operation time is greater than or equal to 100 hours; sampling is conducted after circulation, and the coercive force change rate delta Hcj and the residual magnetism change rate delta Br of the sample are measured. According to the invention, whether irreversible performance degradation of the magnet occurs can be determined.

The present disclosure discloses an outer rotor motor and an unmanned aerial vehicle apparatus. The outer rotor motor includes a rotor assembly and a stator assembly. The rotor assembly includes a plurality of permanent magnet rotor elements. The stator assembly includes a stator yoke and a plurality of stator teeth disposed in a circumferential direction of the stator yoke. An air gap is used to separate the rotor assembly and the stator assembly with a gap and in an air gap between an outer arc surface of the stator tooth facing the air gap and an inner arc surface of the permanent magnet rotor element facing the air gap. A gap of a middle section of the air gap is less than gaps of two ends of the air gap.

The invention discloses an internal circulation oil-cooled high-power permanent magnet speed regulator, which relates to the technical field of permanent magnet speed regulators and comprises an oil tank, a speed regulator shell is fixedly mounted on the oil tank, an input shaft and an output shaft are arranged at two ends of the speed regulator shell respectively, the input shaft is connected with a conductor rotor, and the output shaft is connected with a permanent magnet rotor. An oil pumping assembly is arranged between the oil tank and the side wall of the speed regulator shell, a heat dissipation mechanism is arranged in the circumferential direction of the speed regulator shell, an adjusting box is arranged at the end, facing the input shaft, of the speed regulator shell, a distance adjusting mechanism is arranged between the adjusting box and the input shaft, and the heat dissipation mechanism comprises cooling fins and a spraying pipe; a follow-up assembly is arranged between the spraying pipe and the conductor rotor, the spraying pipe can stably and reliably spray and cool the permanent magnet rotor before and after the gap of the conductor rotor is adjusted through the follow-up assembly, and the cooling effect is guaranteed.

The invention discloses a mechanical variable flux motor, and belongs to the technical field. A mechanical variable flux motor comprises a first permanent magnet rotor, a second permanent magnet rotor, an elastic shaft and a limiting mechanism. The elastic shaft is connected with the first permanent magnet rotor and the second permanent magnet rotor to stagger a preset angle; the limiting mechanism is located between the first permanent magnet rotor and the second permanent magnet rotor and limits the included angle between the two within a preset range. The torque output of the motor is adjusted by adjusting the included angle between the two rotors. In an initial state or a working condition requiring a small torque, a preset angle is kept between the two rotors, so that the motor can obtain a small torque and a high maximum rotating speed; when a working condition that the torque is greater than or equal to a rated torque is needed, the included angle between the two rotors is reduced, so that the motor obtains a larger torque, but the maximum rotating speed is correspondingly reduced. According to the motor, the mechanical variable-flux mechanical structure is simplified, the highest rotating speed is obviously higher, the reliability of the motor is improved, and the cost of the motor is reduced.

The magnetic suspension motor comprises permanent magnet rotors, a main shaft and two stator assemblies, the two permanent magnet rotors are coaxially arranged in the axial direction, the two permanent magnet rotors are fixedly connected with the main shaft respectively, the number of magnetic poles of the two permanent magnet rotors is the same, and the two stator assemblies are located on the outer sides of the two permanent magnet rotors respectively. The two stator assemblies respectively drive the two permanent magnet rotors to suspend and rotate through magnetic force. The two stator assemblies correspond to the permanent magnet rotors respectively, one or two independent magnetic circuits are formed, the total electromagnetic force borne by the permanent magnet rotors is improved, and therefore under the condition that the sizes of motors are the same, larger power is provided for the main shaft, and the flow and lift of the pump are improved.

The present invention discloses a frameless torque motor integrated with a multimodal heat dissipation structure, which includes a plurality of stator cores arranged in a ring shape, including an upper splicing plate. The upper splicing plate is a ring-shaped strip structure, and a block is fixed to the lower part of the upper splicing plate. The heat dissipation efficiency of the frameless torque motor is significantly improved through the multimodal heat dissipation structure. The first, second, and third ventilation holes correspond to each other and are interconnected to form a continuous ventilation channel, which, in cooperation with the honeycomb grille structure below the permanent magnet rotor, optimizes the airflow and increases the heat dissipation area. The high thermal conductivity graphene composite phase change material coating applied in the ventilation holes and the honeycomb grille utilizes the high thermal conductivity and phase change heat absorption characteristics of graphene to effectively manage high temperatures and reduce the temperature rise of the motor. In the scenarios of high load and long-term operation of industrial robots, this design can prevent heat accumulation, extend the service life of the motor, improve the operation stability, meet the high power density requirements, and ensure the continuous and efficient performance of robot joint drives.