44results about How to "Improve overload capacity" patented technology

The invention discloses a blast furnace top feeding winch control system which comprises four multi-transmission high-performance motion control frequency converters, and wire inlet structures of the transmission high-performance motion control frequency converters specifically comprise a system wire inlet structure A, a system wire inlet structure B and a system wire inlet structure C, the A system wire inlet structure comprises an A system wire inlet cabinet, an A system first rectifier cabinet, an A system second rectifier cabinet, an A system first inverter cabinet, an A system second inverter cabinet and an A system resistor cabinet; and B, a system wire inlet structure. A winch control system is optimized, a PLC alternating-current variable-frequency speed regulation mode is adopted, the speed dynamic response is high, the overload capacity is large, operation is safe and reliable, and the PLC self-control technology, the position encoder measurement technology, the large-scale variable-frequency speed regulation dragging technology and the intelligent master controller are organically combined and applied; and the faults of galloping, sliding, derailing and the like of the skip car in operation are reduced through double closed-loop control and multi-section speed control of a current loop and a speed loop of the motor.

The invention relates to an MMC (Modular Multilevel Converter) optimal zero-sequence signal calculation method for an overload operation demand, which belongs to the field of power electronic converter signal modulation, and comprises the following steps: constructing an optimal zero-sequence signal calculation operation domain; establishing an optimal zero sequence signal solving mathematical model; continuously iterating the active power and the reactive power, inputting the optimal zero-sequence signal to solve the mathematical model, solving to obtain a plurality of groups of maximum modulation signal margin values Mar, amplitudes and phase angles of corresponding zero-sequence signals, namely amplitudes and phase angles of optimal zero-sequence signals, outputting and recording, and respectively forming an OPA3 (P, Q) table and an OPAlf3 (P, Q) table; and fitting the table by adopting a function fitting mode to obtain a final fitting functional expression which is used for subsequently and quickly calculating the amplitude and the phase angle of the optimal zero-sequence signal. According to the invention, the operation time of modulation signal overmodulation caused by overload operation of the MMC can be greatly reduced, and the problem that the service life of a switching device is shortened due to modulation signal overmodulation is reduced.

The invention discloses a robot servo motor based on magnetic assistance characteristics, which comprises a stator core, a rotor core and magnetic steel, the stator core comprises laminated stator punching sheets and windings, the rotor core comprises multiple layers of laminated rotor punching sheets, spoke type magnetic steel grooves and multiple layers of air magnetic barriers are arranged on the rotor punching sheets, and the magnetic steel is arranged in the magnetic steel grooves; the multiple layers of air magnetic barriers comprise a plurality of arc-shaped magnetic barriers symmetrically arranged on the two sides of the magnetic steel grooves, the arc-shaped magnetic barriers comprise a first arc-shaped magnetic barrier, a second arc-shaped magnetic barrier, a third arc-shaped magnetic barrier and an interelectrode arc edge triangular large magnetic barrier, and a rotor excircle magnetic barrier is arranged at the top of each spoke type magnetic steel groove on the rotor punching sheet. The motor has the advantages that the anti-demagnetization performance and the torque output stability of the motor can be improved while the heat dissipation area of the motor is not changed and the cost of the motor is not additionally increased.

The invention discloses a motor rotor structure with a magnetism gathering effect, an assembling method and a motor, and belongs to the field of permanent magnet synchronous motors. The rotor structure comprises a rotor iron core and a Halbach magnetic steel array; the Halbach magnetic steel array comprises circumferential magnetizing magnetic steel and radial magnetizing magnetic steel which are alternately distributed in the circumferential direction. The radial thickness of the radial magnetizing magnetic steel is greater than that of the circumferential magnetizing magnetic steel, so that the rotor iron core forms a rotor iron core boss at each circumferential magnetizing magnetic steel; the radial magnetizing magnetic steel is divided into N magnetic steel blocks in the circumferential direction, and the radial thickness of each side block is gradually increased from the outer side edge to the inner side edge. Preferably, the two side edges of the radial magnetizing magnetic steel are recessed towards the center block to form a V shape, and the vertex of the V shape is the intersection of the outer side edge of the edge block, the circumferential magnetizing magnetic steel and the rotor core boss. According to the Halbach permanent magnet array, the problems that the Halbach permanent magnet array is large in assembly difficulty, serious in demagnetization phenomenon and low in overload performance can be solved while the magnetism gathering effect of the Halbach permanent magnet array is utilized.

A high-voltage cabinet bus switching device disclosed by the present invention comprises a box body with openings at two ends and a bus passing through the opening of the box body, the bus is formed by overlapping a plurality of layers of copper sheets, the bus is provided with an output end and two input ends, the output end passes through a first floating sealing mechanism fixed at the opening of the box body, and the output end passes through a second floating sealing mechanism fixed at the opening of the box body. The input ends penetrate through a second floating sealing mechanism fixed to an opening of the box body, a gap maintaining mechanism is arranged on the inner side of the box body and used for separating the copper sheets at the platform section, and when the two input ends get close to each other, the gap maintaining mechanism is used for separating the copper sheets at the platform section. The input end of the bus is in a floating state, the bus can be attached to an output copper bar of a circuit breaker of a high-voltage cabinet during installation, installation stress is eliminated, installation reliability is improved, the heat dissipation performance is good, the service life of the high-voltage cabinet is prolonged, and the service life of the high-voltage cabinet is prolonged. And the overload capacity is high.

The invention relates to an integrated braking force sensor, which comprises a pressure sensing terminal, the pressure sensing terminal is of a spoke-like structure and comprises a terminal body, a mounting groove arranged in the terminal body, and a plurality of first bulges and avoiding notches arranged on the periphery of the terminal body, positioning holes are formed in the first bulges, and the positioning holes are communicated with the mounting groove; stress isolation grooves used for isolating stress are arranged between the plurality of first protrusions and the terminal body. The sensitive element is arranged on the pressure sensing terminal; the pressure sensing terminal is used for sensing an external pressure load signal and transmitting the external pressure load signal to the sensitive element; the sensitive element is used for converting the received pressure load signal into an electric signal and outputting the electric signal; and the printed circuit board is mounted in the mounting groove, is connected with the sensitive element and is used for processing the electric signal output by the sensitive element to obtain an output signal. The force sensor is easy to process, the production and manufacturing cost is reduced, the pressure sensing terminal adopting the spoke-imitating structure is excellent in performance and can be integrated on the calipers to serve as a structural part, and the internal space of the calipers is greatly saved.

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.

In order to improve the stability of an existing exciter, a three-phase input winding is arranged on a stator and is connected with a three-phase power supply, a rotor is coaxially connected with a main generator, and meanwhile, a multi-phase output winding is arranged on the rotor and is connected with the input end of a rotating rectifier; the rotor is driven by a prime motor to rotate, and the rotating direction of the rotor is opposite to the rotating magnetic field direction of the stator. When the phase-changing power supply rotor is driven by a prime motor, a rotor winding cuts a stator rotating magnetic field with double fundamental frequency, multi-phase double fundamental frequency induced electromotive force is generated in the rotor winding, and power is supplied to a main generator exciting winding after rectification. The function of converting a three-phase power supply into a multi-phase power supply and then rectifying the multi-phase power supply into a direct-current excitation power supply is achieved, the reliability is high, and brushless can be achieved.

The invention discloses an outdoor oil-immersed transformer convenient for heat dissipation, and relates to the technical field of transformers, the outdoor oil-immersed transformer comprises a box body and a transformer body fixedly mounted at an inner cavity of the box body, a rainproof cover is fixedly mounted at the top of the box body, and fans are fixedly mounted on two sides of the box body; heat dissipation mechanisms are installed on the two sides of an inner cavity of the box body, cooling mechanisms are installed on the heat dissipation mechanisms, a liquid limiting plate is fixedly connected between the heat dissipation mechanisms, and a floating guide pipe is fixedly installed on the top of the liquid limiting plate. According to the outdoor oil-immersed transformer facilitating heat dissipation, automatic opening and closing of an oil duct are achieved through thermal expansion of oil in the cooling mechanism, oil circulation heat dissipation can be completed without external electric drive, the heat dissipation mechanism is arranged in the inner cavity of the transformer box, air cooling is guaranteed, outdoor dust can be effectively prevented from entering the box to be accumulated, and the heat dissipation efficiency is improved. And dust accumulation and blockage of the cooling fins and the heat exchange pipe wall are avoided, heat resistance is increased, maintenance and cleaning frequency is reduced, and the device is suitable for outdoor severe dust raising environments.

The invention discloses a power transmission structure based on viaduct power transmission and heat conduction oil energy recovery. The power transmission structure comprises a transmission system, a cooling system, a recovery system and a lightning protection system. The conveying system comprises a power transmission line, an elevated support and a compartment body. The power transmission line is positioned in the compartment body and is provided with a plurality of steel-cored aluminum wires; the carriage body is fixed at the upper end of the supporting part; the cooling system comprises a heat-conducting oil pipe matched with the power transmission line, an oil pump located in the heat-conducting oil pipe and a cooling water pipe used for cooling the heat-conducting oil pipe, and the steel-cored aluminum wire is located in the heat-conducting oil pipe; the recovery system comprises a steam turbine and a generator; the lightning protection system is provided with a lightning rod and a lightning protection steel cable. The transmission system and the cooling system are arranged, and the power transmission line is soaked in the heat conduction oil pipe, so that heat emitted by the power transmission line in the working process can be quickly transmitted to the cooling water pipe to recover energy, and the situation that the temperature of the steel-cored aluminum wire is too high is avoided; and the stability and overload capacity of the power transmission structure based on viaduct power transmission and heat conduction oil energy recovery are ensured.

The application discloses a flywheel energy storage system and a rotating variable inertia control method and device thereof, wherein the method can realize that when a short fluctuation occurs in a power grid frequency, the speed of a flywheel motor is basically not changed, the kinetic energy is changed by changing the rotating inertia of a flywheel motor rotor, then the conversion between mechanical energy and electric energy is realized by the change of the electromagnetic torque of the motor electromechanically coupled with the flywheel motor, the bidirectional and orderly flow between the kinetic energy of the flywheel motor rotor and the power grid electric energy is realized, the converter link between the motor and the power grid is cancelled, and the excellent overload capacity of the motor itself is fully exerted to cope with the short fluctuation caused by the voltage of the power grid due to the switching of a load and other factors, and the high-quality power supply and safety and stability of the power system are ensured.

The invention provides a keel beam lifting and positioning system based on electric drive, which belongs to the technical field of aircraft assembly and comprises two groups of identical independent lifting systems, the two groups of identical independent lifting systems can form linkage and independently operate, and synchronous lifting and positioning and independent lifting fine adjustment are realized. Each independent lifting system comprises a right-angle hand-cranking speed reducer, a servo motor, a lifter push rod, supporting rods, a keel beam positioner and the like, the right-angle hand-cranking speed reducer is connected with the servo motor, the output end of the servo motor is connected with the lifter push rod to provide lifting power, and the supporting rods are arranged on the two sides of the lifter push rod and used for auxiliary supporting. And the keel beam positioner is used for positioning and locking the keel beam. The device is reliable in performance, and has relatively high overload capacity and relatively high precision; a double-system linkage design is adopted, the overall stability of the system is improved, and independent lifting can be achieved; an adjustable speed reducer is arranged, so that the lifting speed can be adjusted; the system is small in occupied space, simple in structure and convenient to operate; and the stroke protection function is achieved.

The invention relates to a high-rigidity heavy-load precision speed reducer capable of achieving state monitoring. The high-rigidity heavy-load precision speed reducer comprises an outer box shell, a power input unit, a planetary cycloid transmission unit, a power output unit and a state monitoring unit. The planet cycloid transmission unit is installed in the outer box shell, a power input piece of the planet cycloid transmission unit is a sun gear, and a power output piece is a planet carrier. The power input unit comprises a servo motor and a hand-cranking device, the servo motor and the hand-cranking device are respectively connected with an input shaft, two input gears fixed on the two input shafts are meshed with a main power gear, and the main power gear is coaxially and fixedly connected with the sun gear; the power output unit comprises an output gear which is coaxially and fixedly connected with the output end of the planet carrier; a temperature and pressure sensor, an oil product sensor and an adjustable ventilation device of the state monitoring unit are all installed on an outer box shell, and an angle sensor is coaxially and fixedly installed on an output gear. According to the invention, the output angle, oil composition, temperature signals and pressure signals of the speed reducer are monitored in real time, so that the abnormal state of the speed reducer can be quickly judged.

The present invention relates to a motor, comprising a stator and a rotor arranged in the stator, wherein the rotor comprises a rotor core and a plurality of permanent magnets, the rotor core comprises a plurality of magnetic pole units uniformly distributed around the center of the rotor core, the magnetic pole unit comprises a first slot distributed in a V-shape, a permanent magnet is arranged in the first slot, and the first slot is symmetrical about the direct axis; the magnetic pole unit comprises a groove radially recessed inward from the outer peripheral surface of the rotor core, the groove comprises two opposite first surfaces and a bottom surface connecting the two first surfaces, the first slot is located between the center and the bottom surface of the rotor core in the radial direction of the rotor core, the planes where the two first surfaces are located intersect outside the rotor core, and the angle θ of the two first surfaces satisfies 40°≤θ≤55°. The motor of the present invention has excellent performance in heat dissipation performance, torque improvement, cost control, inductance characteristics, magnetic line transmission and weak magnetic speed expansion capability, and is suitable for a wide range of fields such as electric tools, air conditioning compressors, and electric vehicles.

A built-in tangential mixed magnetic steel magnetism gathering type permanent magnet rotor relates to the technical field of motors, the rotor comprises a rotor iron core and a rotating shaft, the rotor iron core is provided with a plurality of permanent magnet units which are symmetrically arranged around the axis of the rotor iron core, and the permanent magnet rotor is characterized in that each permanent magnet unit comprises a middle magnetic steel, middle air permanent magnet grooves and radial magnetic steel are arranged between the adjacent permanent magnet units, the middle air permanent magnet grooves and the radial magnetic steel are arranged on the q shaft, the middle air permanent magnet grooves are arranged on the inner sides of the radial magnetic steel, and the middle magnetic steel and the adjacent radial magnetic steel on the two sides of the middle magnetic steel are arranged in a U shape. The rotor provided by the invention can reduce motor noise and torque ripple.

The invention discloses a box type three-motor mini-tiller which comprises a chassis which is of a split structure and is provided with a battery box and a motor box. The rack adopts a channel steel design; the three motors independently control advancing and differential steering of the wheels and speed adjustment and directional communication maintenance of the rotary blades respectively. The two wheels are respectively driven by two motors; the wheels are connected in a half-shaft mode, a half shaft is supported through a bearing chamber, and the half shaft is matched with an output shaft of the motor and then matched with wheel hubs to transmit power. The motor is large in starting torque, high in overload capacity and capable of adapting to sudden change of working loads; the speed regulation range is wide, the torque control characteristic is good, the speed is regulated through keys, and the operation is simple; the concentricity of the motor is good, vibration caused by combustion pulse of a crank-link mechanism of a fuel engine and mixed gas in a cylinder is avoided, and vibration of the mini-tiller is greatly reduced; and electric energy is used as a power source, so that no pollution, zero emission and high energy utilization rate are realized.

The utility model relates to the technical field of electrostatic sealing of sensor chips, in particular to a sensor chip electrostatic sealing glass grooving structure which comprises a bearing table, and a grooving mechanism is mounted on the table wall of the bearing table. The grooving mechanism is composed of an electric guide rail, a packaging mold, a laser engraving machine body, a laser emitting head, an L-shaped frame and a sliding block in a combined mode, the electric guide rail is installed on the table wall of the bearing table through bolts, the sliding block is installed at the moving end of the electric guide rail, and the packaging mold for containing a glass plate is installed at the top of the sliding block; an L-shaped frame is installed on the table wall of the bearing table through a bolt, the chip area covered in the sealing process is effectively reduced by arranging a digging groove in the electrostatic sealing glass, the problems of thermal resistance, mechanical stress concentration and the like caused by electrostatic sealing are reduced, the stability of the sealing structure is improved, meanwhile, the structure is simple, the production cost is low, and the production efficiency is improved. And the overload capacity of the sensor chip is indirectly improved through glass grooving.

The invention relates to the technical field of photovoltaic energy storage inverters, and discloses a cycle-by-cycle current limiting circuit based on a Helic circuit, a control method and an inverter, in the cycle-by-cycle current limiting circuit, an inductive current sampling signal of the Helic circuit is input into the input end of a first-stage overcurrent protection circuit, the output end of the first-stage overcurrent protection circuit is connected with the first input end of a DSP chip, and the second input end of the DSP chip is connected with the second input end of the Helic circuit; a first output end of the DSP chip is connected with a main switch tube in the Heric circuit; the input end of the secondary overcurrent protection circuit inputs an inductive current sampling signal of the Helic circuit, the output end of the secondary overcurrent protection circuit is respectively connected with the second input end of the DSP chip and the first input end of the trigger, the second output end of the DSP chip is connected with the second input end of the trigger, and the output end of the trigger is connected with a follow current switch tube in the Helic circuit. Two-stage overcurrent protection is set, the respective advantages are taken, and the respective defects are made up, so that a better wave-by-wave current limiting strategy is provided for the inverter.

This invention discloses a nano-silicon-based special transformer cooling oil and its preparation method. The cooling oil comprises the following components by mass percentage: 85%–90% modified silicone oil base oil, 2%–3% spherical nano-silicon particles, 1%–5% composite antioxidant, 0.5%–2% polyether-modified silicone oil dispersant and stabilizer, and the balance being functional additives. This invention constructs a three-dimensional thermally conductive network using surface-modified nano-silicon, synergistically combining composite antioxidants, low-temperature flow improvers, and anti-cavitation additives. This allows the cooling oil to maintain high insulation performance while achieving a thermal conductivity increase of ≥50%, good low-temperature fluidity at -80℃, partial discharge ≤5pC, cavitation inhibition rate ≥78%, overload capacity up to 200%, and service life extended to 40 years. This product is particularly suitable for extreme environments with altitudes ≥5000 meters and temperature differences ranging from -80℃ to +120℃, meeting the requirements of ultra-high voltage DC converter transformers and intelligent substations in cold regions for efficient heat dissipation and long-term stable operation.

The invention belongs to the technical field of pressure sensors, and particularly relates to a flush membrane core, a preparation method and application thereof, and a pressure transmitter. The flush membrane core body comprises a steel base and a flush membrane; wherein the flush membrane comprises a composite strain layer; the composite strain layer comprises a first strain layer, a second strain layer, a third strain layer and a fourth strain layer which are stacked in sequence, and the first strain layer, the second strain layer, the third strain layer and the fourth strain layer cooperate with one another to sense pressure from all directions, so that the strain sensitivity of the flush membrane core is improved. The pressure transmitter containing the flush membrane core body provided by the invention has very high overload capacity, so that the pressure transmitter can keep stable performance in a severe working environment and provide accurate pressure data.

A coreless linear motor disclosed by the present invention comprises a primary assembly and a secondary assembly, the primary assembly can linearly move relative to the secondary assembly, and the primary assembly comprises a substrate and a winding arranged on the substrate. The secondary assembly comprises a supporting plate, a first yoke plate and a second yoke plate, and is fixedly connected with a first permanent magnet group and a second permanent magnet group, and the first permanent magnet group and the second permanent magnet group are sequentially arranged at intervals of N and S in the linear motion direction of the primary assembly; the first permanent magnet set and the second permanent magnet set are oppositely arranged, a certain distance is formed between the first permanent magnet set and the second permanent magnet set so that the primary assembly can linearly move, and an air cooling unit is arranged on the primary assembly. The problem of heat dissipation of the coreless linear motor is solved, the overload capacity and continuous output thrust of the motor under different working conditions are improved, and the coreless linear motor is simple in structure, light in weight and obvious in cooling effect.

An electromagnetic damping photovoltaic tracking system includes: a tracking bracket and a driving mechanism; the tracking bracket includes a column, a rotating support part, a damping part and an electromagnetic part; the column is fixedly arranged, the rotating support part is rotatably arranged on the column, and the driving mechanism is used to drive the rotating support part to rotate; the damping part is arranged on the rotating support part, and the electromagnetic part is arranged on the column, and the electromagnetic part adsorbs the damping part when it is energized to form a damping structure for hindering the rotation of the rotating support part; the electromagnetic part is intermittently energized. The electromagnetic part is intermittently energized. In this way, when working in windy weather, since the electromagnetic part will cooperate with the damping part to generate resistance to prevent the rotating main shaft from rotating excessively when it is energized, it is difficult for the wind kinetic energy to accumulate during the rotation of the rotating main shaft, so that the tracking bracket will not be damaged due to wind resonance.

The invention belongs to the technical field of wind driven generators, and particularly relates to an axial magnetic flux dual-modulation permanent magnet wind driven generator which comprises a stator, a rotor and a wind wheel, the stator is fixed in a motor shell, large teeth and parallel grooves are arranged on the stator, stator windings are embedded in the parallel grooves, a plurality of split teeth are distributed on the large teeth, and the split teeth are connected with the rotor. A stator permanent magnet is embedded in the surface of the stator, the rotor is rotationally connected in the motor shell, the rotor and the stator are coaxially arranged, an air gap is formed between the rotor and the stator, a rotor permanent magnet is embedded in the surface of the rotor, and a driven wheel disc is fixed on the rotor. The magnetic flux modulation effect is achieved, the magnetic resistance and thrust fluctuation of the motor are restrained, the output performance of the motor is improved, the wind energy utilization efficiency can be effectively improved, the rotor and the wind wheel are connected through the driving wheel disc and the driven wheel disc, deviation of the rotor relative to the stator is avoided, and the uniformity of the air gap width of the generator is guaranteed.

The application discloses a universal pressure sensor, which comprises a pressure seat provided with a measuring hole at the bottom end, and a shell fixedly connected with the top edge of the pressure seat at the bottom end, wherein the top end of the pressure seat is provided with a limiting groove, the opening of the shell is downwardly arranged, the top end of the pressure seat and the inner wall of the shell enclose a cavity, the top end of the pressure seat is fixedly provided with a binding plate and a strain gauge, the binding plate is provided with mounting holes and limiting holes, the strain gauge is arranged in the mounting hole, a metal wire is arranged between the strain gauge and the binding plate, a compensation plate is arranged above the binding plate and fixedly connected with the binding plate through a support, the lower end of the support is provided with a limiting block and a containing cavity, the limiting block is inserted into the limiting groove through the limiting hole, the opening of the containing cavity is downwardly arranged to contain the strain gauge and the metal wire, and a plurality of vertical wires are fixedly connected with the compensation plate. The application improves the overload capacity and the sealing performance of the pressure sensor and expands the range of the pressure sensor.

The utility model discloses a cabling stranding table system which comprises a rack, a transmission mechanism is connected with a driving mechanism and a branching mechanism, and the driving mechanism comprises a first motor, a second motor, a third motor, a fourth motor, a fifth motor and a sixth motor. The transmission mechanism comprises a first transmission mechanism, a second transmission mechanism, a third transmission mechanism, a fourth transmission mechanism, a fifth transmission mechanism and a sixth transmission mechanism which are arranged corresponding to the six motors respectively, and the branching mechanism comprises fourteen branching plates which are sequentially arranged in the length direction of the rack. The first motor drives one distributor plate to rotate through the first transmission mechanism, the second motor drives the two distributor plates to rotate through the second transmission mechanism, the third motor drives the two distributor plates to rotate through the third transmission mechanism, and the fourth motor drives the two distributor plates to rotate through the fourth transmission mechanism. A fifth motor drives the two distributor plates to rotate through a fifth transmission mechanism, and a sixth motor drives the five distributor plates to rotate through a sixth transmission mechanism.

The invention discloses a quasi-real friction test bench of a radial plunger tilt cylinder hydraulic motor friction pair, which comprises a hydraulic loading system and a rack, and also comprises an eccentric shaft and a first servo motor which are arranged on the rack, and the eccentric shaft comprises an upper end fixing shaft and a lower end fixing shaft which are connected to the rack through respective rolling bearings; the lower end fixing shaft is coaxially connected with the first servo motor, the upper end fixing shaft and the lower end fixing shaft are coaxial, and the eccentric shaft further comprises an adjustable eccentric shaft with the distance between the axis and the axis of the fixing shaft adjustable. Two tilt cylinders needing to be subjected to a real friction test are symmetrically arranged on the rack; the device further comprises a micro swing angle generating mechanism used for simulating reciprocating swing friction between a radial plunger swing cylinder hydraulic motor crank and the swing cylinder. The quasi-real friction test bed is high in pertinence, can perform a quasi-real friction test on the radial plunger tilt cylinder hydraulic motor friction pair for a long time, and can obtain related data of friction performance of the radial plunger tilt cylinder hydraulic motor friction pair under different working conditions.

The invention provides a rotor assembly of a self-starting permanent magnet auxiliary synchronous reluctance motor and a motor, the rotor assembly comprises a rotor iron core and permanent magnets, the rotor iron core comprises an outer layer filling groove, an inner layer filling groove, permanent magnet grooves, a shaft hole and a rotor excircle, the shaft hole is located at the central axis position of the rotor iron core, and the permanent magnet grooves are located in the outer layer filling groove. The permanent magnet grooves are located in the periphery of the shaft hole so that the permanent magnets can be arranged in the permanent magnet grooves, the inner-layer filling grooves are located between the permanent magnet grooves and the outer circle of the rotor, and the outer-layer filling grooves are located between the inner-layer filling grooves and the outer circle of the rotor. The permanent magnet grooves, the inner-layer filling grooves and the outer-layer filling grooves form a magnetic barrier layer in the radial direction of the rotor, and the inner-layer filling grooves and the outer-layer filling grooves are filled with conductive conductors. According to the self-starting permanent magnet auxiliary synchronous reluctance motor, the problem of low starting torque of the self-starting permanent magnet auxiliary synchronous reluctance motor in the prior art can be solved.

The present invention discloses a rolling force measurement system and a measurement method, which relates to the field of rolling technology, and includes: a primary element and a secondary instrument, wherein the primary element is a sensor assembly; the sensor assembly is arranged on a rolling mill frame, and an external measuring point and an internal measuring point are arranged on the rolling mill frame, wherein the external measuring point is provided with a first sensor assembly and a second sensor assembly, and the internal measuring point is provided with a third sensor assembly and a fourth sensor assembly; the two sensor assemblies of the external measuring point and the internal measuring point are both arranged in an "eight" shape, and the output ends of the measuring bridge of the first sensor assembly and the second sensor assembly, and the output ends of the measuring bridge of the third sensor assembly and the fourth sensor assembly are both reversely connected, and the output ends of the external measuring point and the internal measuring point are connected in series and connected to the secondary instrument. The present invention can improve the working environment of the primary element of the measurement system, and it is easy to take isolation measures against the influence of harmful factors such as heat sources and steam, and it is convenient for the installation and maintenance of the primary element.

The invention discloses an automatic carrier for a wafer cassette storage system, which comprises a Z-axis assembly, a pick-and-place unit is arranged on the Z-axis assembly, the pick-and-place unit is connected with the Z-axis assembly in an up-and-down sliding manner, and a power part for driving the pick-and-place unit to slide up and down is arranged in the Z-axis assembly; the power part comprises a driven chain wheel and a driving chain wheel which are located at the upper end and the lower end of the Z-axis assembly, a chain is connected to the driven chain wheel and the driving chain wheel in a winding mode, and the two ends of the chain are connected with the taking and placing unit after winding around the driven chain wheel and the driving chain wheel correspondingly. The stability of chain movement is guaranteed through the multiple guide chain wheels, then the taking and placing assembly can be driven to accurately move up and down, meanwhile, the linear guide rails are arranged, vibration can be greatly restrained through guiding and transmission directions of the linear guide rails and the transmission chain wheels, damage to products in the wafer box due to vibration is reduced, and the production efficiency is improved. And the yield of products is improved.

The utility model discloses an electric aviation coiling vehicle which comprises a reel, a reel is arranged in the middle of the reel in a penetrating mode, a vehicle frame is arranged at the lower end of the reel and comprises a rectangular frame, a left side supporting plate and a right side supporting plate, and universal wheels are arranged at the four vertex angle positions of the lower end face of the rectangular frame respectively. A stainless steel waterproof distribution box and a waterproof motor are fixedly arranged on the right end face of the right supporting plate, and the waterproof motor is located under the lower end face of the stainless steel waterproof distribution box. A motor shaft is arranged at the left end of the waterproof motor, and a chain transmission mechanism is arranged between the right end of the reel and the motor shaft; a handle is arranged at the rear end of the reel; the left end of the waterproof traverse unit is fixedly connected with the lower end of the front end face of the left supporting plate, and the right end of the waterproof traverse unit is fixedly connected with the lower end of the front end face of the right supporting plate. According to the technical scheme, the structural design is reasonable, the wire coil is convenient to carry, waterproof performance is good, safety and reliability are achieved, and practicability is good.