9268results about "Cooling/ventillation arrangement" patented technology

The invention relates to a drive (30) comprising: - at least one dynamoelectric rotary machine (1) arranged in a housing (2), with a winding system (5) arranged in a stator (4) and a rotor (6) separated therefrom by an air gap (23), which is rotatably mounted about an axis (12) via at least one bearing (10) of a B-side cup-shaped end shield (7); - at least one converter, wherein the converter comprises at least some of the following components, such as power semiconductors, inductors, capacitors, control and regulation units, and communication units in a housing volume (13), wherein the converter is radially surrounded at least partially by the B-side end shield (7), and at least some components of the converter are thermally connected to the end shield (7), in particular by arranging heat-intensive components of the converter on an inner side wall (20) of the cup-shaped end shield (7).- wherein the converter is arranged axially between the dynamoelectric rotary machine (1) and the bearing of the B-side pot-shaped bearing shield (7).

The invention relates to a drive (30) with - at least one dynamoelectric rotary machine (1) arranged in a housing (2), with a winding system (5) arranged in a stator (4) and a rotor (6) separated therefrom by an air gap (23), which is rotatably mounted about an axis (12) via at least one bearing (10) of a B-side cup-shaped end shield (7), wherein the stator (4) and rotor (6) are located in a motor interior (18) - at least one inverter, wherein the inverter comprises at least some of the following components, such as power semiconductors, chokes, capacitors, control and regulation units and communication units, and is located in an inverter installation space (13) which is radially surrounded at least partially by the B-side end shield (7), wherein at least some components of the inverter are thermally connected to the end shield (7), in particular by thermally connecting heat-intensive components of the inverter,are arranged on an inner side wall (20) of the pot-shaped bearing shield (7), - wherein the converter is arranged axially between the dynamo-electric rotary machine (1) and the bearing of the B-side pot-shaped bearing shield (7), - wherein the motor interior (18) and the converter installation space (13) are separated by a shielding element (16).

The invention provides a cooling structure of a motor stator, an oil-cooled motor and a vehicle, and belongs to the technical field of automobiles. A guide oil duct and a stepped oil injection duct are arranged on a stator core; the middle of the stator iron core is provided with an oil inlet groove surrounding the stator iron core in the circumferential direction, and a cooling medium enters the flow guide oil channel through the oil inlet groove in the middle of the stator iron core and obliquely injects oil to the stator windings at the two ends of the stator iron core through the stepped oil injection channel. According to the invention, the oil path is directly arranged on the stator core and the stepped oil injection channels are symmetrically arranged, and the cooling medium can be intensively and obliquely sprayed to the surface of the stator winding through the stepped oil injection channels, so that the heat dissipation effect and the heat dissipation efficiency are improved, and the thermal load capacity of the motor and the working efficiency of the motor are further improved; and faults of the motor caused by non-uniform cooling, overhigh local temperature rise and temperature gradient are reduced. The structure is simple, and the overall manufacturing and maintenance cost is reduced; meanwhile, the overall size of the motor is reduced, and overall light weight is facilitated.

An electric work machine with improved workability at high output, configured to cut a work target, is provided. The electric work machine comprises: a working portion configured to cut the work target and a main body including: a housing; a flow path forming portion; a motor; and a control unit, wherein the motor generates rotational power for driving the working portion, the control unit electrically controls rotation of the motor, the flow path forming portion forms an air flow path including a first air flow path and a second air flow path, the first air flow path communicates with an exterior of the housing to allow external air to flow to the motor via the control unit, and the second air flow path communicates with the exterior of the housing so as to allow external air to flow directly to the motor.

The invention provides an electric engine, a control method, a related device, a motor controller and an aircraft, and relates to the technical field of aircrafts. The electric engine comprises a power motor, a heat dissipation system and a control module, a cavity is formed in the power motor, the control module is integrated in the cavity, the space occupied by the electric engine is reduced, and therefore the size of the aircraft is reduced; the control module comprises a plurality of integrated driving modules, part of the driving modules are electrically connected with the power motor so as to control the power motor, and part of the driving modules are electrically connected with a heat dissipation motor in the heat dissipation system so as to control the heat dissipation motor. The performance and efficiency of the electric engine are improved through unified integrated control over the power motor and the heat dissipation motor. And through a unified control architecture, the system design is simplified, the development and maintenance cost is reduced, and the maintainability of the electric engine is improved.

The invention relates to a cooling structure for an ultraprecise linear motor and belongs to the technical field of linear motors. The cooling structure solves the problem of proneness to heat exchange with environment caused by high side temperature of two-side surface-mounted cooling structures of existing linear motors. The cooling structure comprises a winding supporting portion, a winding and a heat conductive portion, wherein the winding is fixed on the surface of the winding supporting portion, the heat conductive portion is arranged on the surface on the outer side and fixedly connected with the winding supporting portion, the heat conductive portion is a copper foil ring which fits the outer profile of the winding and is sleeved and fixed on the surface on the outer side of the winding, or the heat conductive portion is a copper foil heat conductive ring formed by arraying multiple copper foil sections in a dispersed manner, the copper coil heat conductive ring fits the outer profile of the winding, and each copper coil section is fixed on the surface on the outer side of the winding. The cooling structure for the ultraprecise linear motor is suitable for cooling of linear motors.

The present application discloses a coaxially integrated servo motor pump with integrated drive control functions, comprising a motor pump housing, a controller housing, and an electrical connector. The motor pump housing is provided with a blind hole, a first cavity for accommodating a plunger pump assembly, and a second cavity for accommodating a servo motor assembly, wherein the plunger pump assembly and the servo motor assembly are connected via a rotating shaft. The controller housing is connected to one end of the motor pump housing, and a drive controller is provided within the controller housing. The blind hole communicates with the second cavity, and the electrical connector is sealed and connected to the blind hole, and the electrical connector is electrically connected to the servo motor assembly and the drive controller. The distribution plate and the sealing assembly are respectively sealed with both ends of the motor pump housing. Cooling is achieved through a cooling oil channel, which connects from one end of the motor pump housing near the plunger pump assembly to the second cavity and then divides into two paths, one path passing through the center of the rotating shaft, and the other path connecting to the first cavity and passing through the distribution plate. The coaxial integration of the drive control functions is achieved, and the cooling effect is good.

The invention relates to the technical field of axial flux motors, in particular to a stator cooling structure, a stator assembly and an axial flux motor, the stator cooling structure comprises a shell and a partition plate, the shell is internally provided with a cooling cavity for accommodating a plurality of stator units, and the shell is connected with an inlet for inputting a cooling medium and an outlet for outputting the cooling medium; the partition plate is connected into the shell and divides the cooling cavity into a first cavity and a second cavity in the thickness direction. The partition plate is provided with a first via hole matched with the stator unit and a plurality of channels communicated with the first cavity and the second cavity, and reciprocating flow of a cooling medium between the first cavity and the second cavity is achieved through the channels. The stator heat dissipation effect can be improved, and local high temperature in the stator is prevented.

The invention relates to an aircraft electric drive oil cooling structure which comprises an outer rotor assembly, a stator assembly, a controller assembly, an oil pump and a heat dissipation assembly, the stator assembly comprises a stator shell and a winding, a sealing cover is further fixed to the outer side of the winding, and a cooling cavity is formed between the sealing cover and the stator shell; a bottom plate is further arranged at the bottom of the stator shell, the controller assembly is fixed in a mounting cavity formed by the bottom plate and the stator shell and comprises a circuit board and a cooling plate which are close to each other, the circuit board is connected with the winding, an oil duct A is further arranged on the bottom plate, an oil inlet pipe and an oil outlet pipe are arranged on the cooling plate, and an oil duct B communicated with a cooling cavity is further arranged on the bottom plate; the heat dissipation assembly comprises a heat dissipation fin set and a fan assembly, the heat dissipation fin set and the oil pump are both fixed to the lower portion of the bottom plate, heat dissipation fins form a ring and are arranged outside the oil pump in a surrounding mode, the heat dissipation fin set, the oil pump and the bottom plate are communicated with one another, and the fan assembly is fixed to the lower portion of the heat dissipation fin set. Efficient, light-weight, high-integration-level and reliable heat dissipation of the electric drive of the aircraft is achieved.

The invention relates to the technical field, provides a notch liquid cooling structure of a flat wire motor stator, and realizes high-efficiency and low-consumption motor stator cooling through an accurately-positioned full-coverage liquid cooling structure. In order to achieve the purpose, the motor comprises a stator iron core, closed iron core wire grooves are evenly distributed in the inner edge of the stator iron core, wires forming windings are inserted in the iron core wire grooves, the wires are tightly attached to the outer diameter ends of the iron core wire grooves, oil way channels are formed between the wires and the inner diameter ends of the iron core wire grooves, the two ends of the stator iron core are provided with end rings, and the two ends of the stator iron core are provided with end rings. The end ring wraps the wire, and the end ring and the oil path channel form a closed oil path space. Due to the adoption of the technical scheme, the oil path channel formed between the wire and the inner diameter end of the iron core wire slot is matched with the closed oil path space formed by the end ring and the oil path channel, and the position of the oil path channel is used for accurately cooling the wire with the highest heating.

The invention belongs to the technical field of permanent magnetization remanufacturing, and particularly relates to a permanent magnetization regeneration method for a waste motor of copper alloy wire processing equipment, and the method comprises the steps: disassembling a waste asynchronous motor, and reserving a case, a stator, a rotor core and a rotating shaft which are not damaged; the specifications of the air injection channels are determined according to the diameter of the rotating shaft, more than two air injection channels are arranged on the rotating shaft at equal-angle intervals, and then the rotating shaft is installed in the machine shell; the rotor core is split to obtain steel sheets, and permanent magnet grooves, magnetic isolation air grooves and air injection channel grooves are formed in the steel sheets; the permanent magnets are assembled in the permanent magnet grooves, then the steel sheets are laminated according to a first rule to obtain a rotor, and then the rotor is assembled to the rotating shaft; a rear end cover of the machine shell is removed, a heat dissipation machine cover is manufactured according to the diameter of the rear end cover, a bearing groove and an air outlet hole are formed in the heat dissipation machine cover, and then the heat dissipation machine cover is assembled to the machine shell; and a frequency converter is additionally arranged on the shell. The remanufactured permanent magnet synchronous motor manufactured by the method has better sealing performance and heat dissipation performance.

A method of cooling rotor winding end turns extending from a rotor core includes coupling a collar to a rotatable shaft of the rotor core. The collar has a first wall confronting the rotor core, a second wall spaced from and opposing the first wall, a third wall between the first and second walls defining a set of apertures therethrough, a first cavity cooperatively defined by the first, second and third walls, having a first opening opposing the third wall, a fourth wall circumscribing the third wall, a second cavity cooperatively defined by the second, third and fourth walls, the second cavity defining a second opening opposing the second wall. The first and second cavities are in fluid communication, and the rotor winding end turns are receivable into the second cavity. The method includes directing a coolant into the first cavity, and delivering the coolant to the second cavity.

An aircraft system includes an electrified powertrain having a first power module and a second power module. The aircraft system further includes a thermal management system having a thermal fluid loop for conveying a thermal fluid. The first power module and the second power module are in thermal communication with the thermal fluid loop. The thermal management system further includes a heat exchanger in thermal communication with the thermal fluid loop upstream of the first power module and the second power module such that the thermal fluid from the heat exchanger is partitioned between the first power module and the second power module.

The invention provides an axial magnetic flux motor driven RV speed reduction driving assembly which comprises an axial magnetic flux motor unit and an RV speed reducer unit which are connected, the axial magnetic flux motor unit and the RV speed reducer unit are integrated in a shell, the axial magnetic flux motor unit comprises a plurality of stators which are distributed in an annular mode, and the stators are connected with the axial magnetic flux motor unit. A stator is arranged on the rotor, a disc type rotor is arranged on each of the two sides of the stator, a plurality of torsion bars which are uniformly distributed in the circumferential direction are arranged on the rotor facing the side where the RV speed reducer unit is located, the torsion bars are connected with a sun gear of a planetary gear train of the RV speed reducer unit, and an output disc of the RV speed reducer unit is a power output end. The RV speed reduction driving assembly driven by the axial magnetic flux motor has the advantages of being large in starting torque, high in mechanical efficiency, compact in structure, high in overload capacity and the like.

The invention provides a water-cooling heat dissipation type motor end cover and shell structure which comprises a motor outer shell, a motor inner shell, a first water cooling mechanism, a second water cooling mechanism, a water supply mechanism and a control console. Therefore, automatic switching between a basic heat dissipation mode in which only the first water cooling mechanism is started, an intelligent cooperation mode in which the two water cooling mechanisms are started cooperatively, and a full-power heat dissipation mode in which the two water cooling mechanisms are fully opened is intelligently realized. Through cooperation of the double water cooling channels and an intelligent control strategy, the problems of fixed heat dissipation capability, slow response and low energy efficiency in the prior art are solved, accurate matching of the heat dissipation capability and the actual working condition of the motor is realized, and the heat dissipation efficiency, the energy-saving effect and the system reliability are remarkably improved.

The present disclosure provides a sealing device and an in-wheel motor including the sealing device. The in-wheel motor includes a stator, a rotor rotatably disposed with respect to the stator, an annular inner seal connected to the stator and spaced apart from the rotor by a predetermined gap so as to be disposed between the stator and the rotor, and an annular slinger coupled to an end portion of the rotor, wherein the annular inner seal seals between the slinger and the in-wheel motor.

The utility model relates to an efficient heat dissipation type motor, which comprises a stator and a main shaft, the outer end of the stator is fixedly connected with a heat dissipation shell, the outer end of the heat dissipation shell is fixedly connected with a plurality of heat dissipation fins which are distributed in a circumferential array around the axis of the stator, and the outer end of the heat dissipation shell is fixedly connected with a front end cover through screws. A heat absorption cavity is formed in the front end cover, a plurality of hollow heat absorption rings are fixedly connected to the end, close to the stator, of the front end cover, the heat absorption cavity and the heat absorption rings are filled with phase change materials, an overflowing ring is fixedly connected to the end, away from the stator, of the front end cover, and a plurality of phase change circulating pipes are fixedly connected to the outer end of the front end cover. According to the utility model, the collaborative design of multiple heat dissipation mechanisms is adopted, the heat dissipation efficiency of the motor is significantly improved through the organic combination of phase change material heat storage, forced air cooling and heat conduction and dissipation, and the technical problem of insufficient heat dissipation of a high-power motor is effectively solved.

A stator for an electric machine includes a stator core defining a slot extending in an axial direction from a first end to a second end, a wire disposed in the slot, a coolant pipe disposed in the slot and extending in the axial direction from the first end to the second end, the coolant pipe extending from a pipe inlet to a pipe outlet, and a thermally conductive potting material disposed in the slot between the coolant pipe, the wire, and the stator core.

The utility model relates to the technical field of shield pumps, in particular to a totally-enclosed shield pump which comprises a shield pump body and a shield motor, one side of the shield pump body is connected with the shield motor through a hoop, and the shield motor comprises a front bearing seat assembly, a rear bearing seat assembly, a stator assembly, a rotor assembly and a cable head. The rotor assembly is sleeved with the stator assembly, the front bearing seat assembly and the rear bearing seat assembly are connected to the two sides of the stator assembly respectively, the front bearing seat assembly comprises a front bearing seat and a front bearing, and the rear bearing seat assembly comprises a rear bearing seat, a rear bearing and a plug. The motor can be cooled, the loss of the bearing can be reduced, the motor is prevented from being damaged due to overheating, the motor and the pump body are simple in connection, the assembly process is simple, maintenance is convenient, and the motor can be quickly opened to be repaired when the shield pump is damaged.

The invention relates to the technical field of motor cooling, in particular to an oil-water composite cooling motor heat dissipation structure and a heat dissipation method thereof.The oil-water composite cooling motor heat dissipation structure comprises a machine shell, a stator iron core, a winding and a rotor are arranged in the machine shell, and a hollow shaft is inserted into the rotor in a penetrating mode. Water flows through the S-shaped water channel on the casing, the casing and the stator core are cooled when the water passes, most heat is taken away, and basic temperature control is maintained; cooling oil is guided into the first oil cooling channel, the second oil cooling channel and the third oil cooling channel through the oil inlets, it is guaranteed that all positions of the stator can make synchronous contact with heat dissipation oil in the first oil cooling channel, particularly, effective heat dissipation is conducted on a stator iron core, the oil enters an oil injection ring, and the cooling effect is improved. According to the utility model, oil is sprayed to a stator winding at 360 degrees circumferentially, heat dissipation is enhanced, the other two oil cooling channels guide oil to a bearing and a rotor respectively, a plurality of heating parts can be considered, a specific oil way is designed to directly cool the heating parts, the lubricating and heat dissipation efficiency is improved, and high-speed operation of the motor is realized.

The invention discloses an aviation generator with a self-stabilizing function, and relates to the technical field of aviation generators, the aviation generator comprises a casing, a driving device, a cooling device and a soaking device, the casing is used as a main bearing main body and is used for mounting other devices, the driving device is mounted through a driving cavity, and the cooling device is used for cooling the cooling device; the driving device is used for converting external input torque into electric energy to be stored, the cooling device is used for cooling the whole machine, the soaking device is used for assisting in adjusting the temperature of oil liquid, the proportion of the cooled oil liquid is adjusted according to the temperature rising conditions of the oil liquid under different working conditions, and therefore the final oil liquid temperature is adjusted. And the temperature of the oil entering the circulation again tends to be stable.

A vehicle drive device includes a rotating electric machine disposed on a first axis, an output gear mechanism and an output member disposed on a second axis, and a case that houses these elements. The second axis is disposed below the first axis, a suction port of an oil pump is disposed below the first axis and the second axis and between the first axis and the second axis in a width direction, an outermost gear is disposed so that a direction of rotation at a lower end portion of the outermost gear during forward movement of a vehicle points toward the suction port, and a part of a peripheral wall section of the case that faces a lower surface of the rotating electric machine is inclined downward toward the suction port.

An arrangement for a vehicle includes a fuel cell, an electric traction and / or propulsion motor, and a single cooling circuit cooling the fuel cell and the electric motor. The cooling circuit includes two parts: a first, high-flowrate and high-temperature part including a high-temperature exchanger and a second, low-flowrate and low-temperature part including a low-temperature exchanger. The first part cools the fuel cell and the second part cools the electric motor. The first part includes a high-flowrate pump, in particular for a high flowrate of between 8000 l / h and 9000 l / h and the second part includes a low-flowrate pump, in particular for a low flowrate of between 2000 l / h and 3000 l / h.

The invention relates to an integrated protection magnetic suspension motor and a magnetic suspension vacuum pump, and belongs to the technical field of magnetic suspension motor protection. In the magnetic suspension motor, a front backboard is arranged at the front end of a casing, a tail end cover and a tail end cover are arranged at the rear end of the casing, the casing, the front backboard, the tail end cover and the tail end cover form an installation cavity, and a front protection bearing seat, a front radial magnetic bearing seat, a rear protection bearing seat and a rear radial magnetic bearing seat are installed in the installation cavity. And a seam and a connecting surface between the bearing seats are prevented from being exposed outside. Only one air inlet and one air outlet are formed in the machine shell, leakage points are reduced through the design of the single air inlet and the single air outlet, and protection above IP54 is achieved. Meanwhile, heat dissipation and protection of the motor are considered at the same time through the design.

The invention provides an air-cooled axial flux motor. The air-cooled axial flux motor comprises a rotating shaft, a stator, a first rotor and a second rotor, two ends of the motor shell are respectively provided with a first air vent and a second air vent; each rotor comprises a rotor disc and a magnetic steel assembly; a plurality of radial flow fan blades are arranged on the side, away from the stator, of the rotor disc in the circumferential direction, and a first air channel is formed between every two adjacent radial flow fan blades. The rotor disc is provided with air passing holes in one-to-one correspondence with the first air ducts, and the air passing holes are axially communicated with the stator shaft hole; the radial flow fan blades on the two rotor discs are configured to be installed in the back-to-back direction. Therefore, when the motor works, a radial-axial-radial airflow cooling path can be formed in the motor shell, so that direct air cooling of the stator and the rotor is realized; the fan blades are completely integrated in the motor and are driven by the rotation of the rotor, so that the dependence on an external fan is effectively eliminated, and the increase of an additional mounting space is avoided; and the self-adaptive adjustment of the cooling intensity can be realized.

The invention discloses a ventilation cooling optimization method for an all-hydrogen-cooled gas turbine generator, and relates to the technical field of all-hydrogen-cooled generator cooling, and the method comprises the steps: analyzing cooling demands, calculating loss in combination with a high-frequency start-stop peak regulation working condition, and setting a stator RTD temperature, an iron core temperature and a temperature rise target; an end ventilation structure is designed, the diameter of the fan is optimized, and bar gaps, wind shield holes and inner supporting ring ventilation grooves are formed; optimizing variable air ducts of the iron core, and adjusting the width of the air ducts according to thermal load partitions; cFD coupling simulation verification is carried out, and a loss data simulation flow field and a temperature field are imported; carrying out physical test iterative optimization, manufacturing a prototype model, testing, and adjusting parameters until errors are qualified; operation monitoring and dynamic adjustment are carried out, and a sensor is installed to collect data in real time and adapt to working condition requirements. Cooling uniformity and efficiency are improved, peak regulation start and stop working conditions are adapted, hydrogen parameter change influences are balanced, vibration and cooling are cooperatively controlled, operation and maintenance convenience is improved through modular design, and long-term stable operation of the generator is guaranteed.

The utility model discloses a motor base structure easy to radiate heat, which belongs to the technical field of motors and comprises a junction box base, the junction box base is arranged on a base shell, a plurality of ventilation slot assemblies are arranged on the periphery of the upper portion of the base shell, and a plurality of ventilation pipe assemblies are arranged between every two adjacent ventilation slot assemblies. A plurality of heat dissipation fins are further arranged on the upper portion of the machine base shell, an efficient heat dissipation system is jointly formed through the ventilation groove assembly, the ventilation pipe assembly and the heat dissipation fins, the ventilation groove assembly and the ventilation pipe assembly accelerate air flow in the machine shell, and the heat dissipation fins increase the heat dissipation area. Therefore, heat in the inner cavity of the motor can be dissipated to the outside more quickly, the internal temperature of the motor can be effectively prevented from being too high, the service life of the motor is prolonged, and the working stability is improved.

An electric propulsion system for a vertical take-off and landing (VTOL) aircraft having a heat exchanger to cool fluids used in an electrical engine, the electric propulsion system comprising at least one electrical engine mechanically connected directly or indirectly to a fuselage of the VTOL aircraft and electrically connected to an electrical power source. The electrical engine may comprise an electrical motor having a stator and a rotor; a gearbox assembly comprising a sun gear; at least one planetary gear; a ring gear; and a planetary carrier. The electric engine may include an inverter assembly comprising a thermal plate and an inverter assembly housing; an end bell assembly that is connected to the thermal plate of the inverter assembly; and a heat exchanger comprising an array of cooling fins and tubes.

The invention relates to an electric engine, a power device and an aircraft, and belongs to the technical field of aircraft power equipment.The electric engine comprises a power motor and a liquid cooling flow path arranged in the power motor and comprises a stator support; the heat dissipation system comprises a fan, a radiator and a heat dissipation motor, an outlet of the radiator is connected with an inlet of the liquid cooling flow path, an inlet of the radiator is communicated with an outlet of the liquid cooling flow path, and the fan is used for cooling the radiator and / or the power motor; the motor rear cover is fixedly connected with the stator bracket; and the two direct-current converters are both mounted on the motor rear cover and are both electrically connected with the heat dissipation motor. The two direct-current converters convert high-voltage direct current accessed by the electric engine into low-voltage direct current capable of being used by the heat dissipation motor, and the electricity utilization requirement of the heat dissipation motor is met. Due to the redundancy design of the two direct-current converters, when one path of low-voltage power supply breaks down, the other path of low-voltage power supply can still supply power to the heat dissipation motor in a low-voltage mode, and enough fault handling time can be provided for the whole power supply system.

The invention relates to the field of automobile alternating-current generators, and discloses a high-power alternating-current generator which comprises a machine shell, a rear end cover arranged behind the machine shell and a built-in machine shaft. A heat dissipation hole is formed in the rear end cover, a rotating block with a first fan blade is arranged in the hole, and the rotating block is rotationally installed on a supporting frame fixed to the rear end cover; a connecting groove is formed in the transmission shaft, the main shaft is inserted into the groove and is in transmission connection with the groove, and two ends of memory alloy in the groove are fixedly connected with the main shaft and the transmission shaft; the rotating block and the transmission shaft are in clutch transmission through the second butt joint assembly. A sliding sleeve with a second fan blade is arranged between the first fan blade and the second fan blade, is provided with a through hole and is in clutch transmission with the transmission shaft through a first butt-joint assembly; the sliding sleeve is provided with a groove, the rotating block is rotatably provided with a connecting rotating ring, the connecting rotating ring is fixedly connected with a supporting rod, and the supporting rod is inserted into the inserting groove. A mechanism for driving the transmission shaft to move is arranged between the transmission shaft and the sliding sleeve. After the temperature in the alternating-current generator rises, the transmission shaft drives the rotating block and the first fan blade through the second butt joint assembly, the two fan blades are stacked for heat dissipation, and the high-temperature requirement is met.