49results about How to "Wide speed range" patented technology

The invention belongs to the technical field of measurement of a flow field in a combustion chamber, and particularly discloses a low-emission gas turbine combustion chamber flow field simulation experiment test method which is used for performing experiment test on the vertical direction of the central axis of a swirler so as to obtain flow field characteristics of an outlet of the swirler and a head of the combustion chamber. According to the invention, a PIV test system is adopted to perform experimental test on the flow field of the coaxial staged combustion chamber of the engine, and at present, related research reports at home and abroad are few; and 2, carrying out numerical calculation on the flow field characteristics of the coaxial staged combustion chamber of the engine by coupling the constructed simplified natural gas chemical reaction mechanism and the CFD calculation model. The research results can provide theoretical basis and technical support for revealing the flow field characteristics in the coaxial staged combustion chamber of the natural gas turbine and optimizing the structure and performance of the combustion chamber. And thirdly, a numerical calculation method for the flow field of the engine combustion chamber is newly explored.

This invention provides a cup assembly for a food processor, including a cup body, a cup lid, and a processing component disposed within the cup body. It also includes a gearbox, which comprises a movably disposed clutch output shaft. When the clutch output shaft moves to a first position, it drives the processing component to output a first rotational speed; when the clutch output shaft moves to a second position, it drives the processing component to output a second rotational speed. The cup lid is installed in place, maintaining the clutch output shaft in either the first or second position. Furthermore, a food processor with the aforementioned cup assembly is provided. In the first position, the clutch output shaft outputs a first rotational speed to adapt to multi-functional cooking; in the second position, it outputs a second rotational speed to adapt to another multi-functional cooking method requiring a different speed. By changing the position of the clutch output shaft, the processing component can be replaced and the rotational speed can be automatically switched. Moreover, the output speed range is wide and the torque is high, avoiding stalling caused by high processing resistance.

The invention discloses a cotton candy machine which comprises a base and a forming cavity, a candy bin is arranged in the forming cavity, a silk outlet hole is formed in the top of the candy bin, and a heater is arranged around the candy bin; a mounting cavity is formed in the base, a circuit board motor is arranged in the mounting cavity, the circuit board motor comprises a circuit board, a rotor and a rotating shaft, a winding coil is arranged on the circuit board, and the circuit board is a PCB (printed circuit board); the rotor is provided with a magnet, the rotor and the circuit board are oppositely arranged, and the rotor is fixedly connected with the rotating shaft; and a rotating shaft of the circuit board motor is in transmission connection with the candy bin. According to the marshmallow machine, the circuit board motor is adopted, the PCB serves as the motor stator, the overall structure is compact, the size is small, the weight is light, the rotating speed range is large, higher portability is achieved, and the working efficiency of the marshmallow machine can be further improved.

The pruning unmanned aerial vehicle comprises a main body, flight mechanisms are arranged at the four corners of the outer edge of the main body, a pruning platform is arranged at the bottom of the main body, one side of the pruning platform is connected with a pruning motor through a C-shaped connecting rod, and the output end of the pruning motor is connected with a blade; the pruning motor is a circuit board motor and comprises a circuit board, a rotor and a rotating shaft, a winding coil is arranged on the circuit board, and the circuit board is a PCB (printed circuit board); the rotor is provided with a magnet, the rotor and the circuit board are oppositely arranged, and the rotor is fixedly connected with the rotating shaft; and a rotating shaft of the circuit board motor is in transmission connection with the blade. According to the pruning unmanned aerial vehicle, the driving motor and the pruning motor both adopt circuit board motors, the PCB serves as a motor stator, the overall structure is compact, the size is small, the weight is light, the rotating speed range is large, higher portability is achieved, and the working efficiency of the unmanned aerial vehicle can be further improved.

The invention discloses a series-parallel variable flux permanent magnet memory motor, which comprises a stator, an armature winding, a hybrid permanent magnet rotor and a non-magnetic rotating shaft, the stator comprises a plurality of stator yokes and iron core teeth arranged at the end parts of the stator yokes, armature windings are wound on the iron core teeth, the plurality of iron core teeth are encircled to form a circular hollow area, the hybrid permanent magnet rotor is arranged in the hollow area, the non-magnetic rotating shaft is arranged at the central position of the hollow area, and the hybrid permanent magnet rotor rotates around the non-magnetic rotating shaft. The problem that the size design of the permanent magnet is limited by the spatial position is effectively solved, the demagnetization resistance of the low-coercive-force permanent magnet and the flux weakening capacity of the motor are improved, multi-stage flux adjustment under different working conditions can be achieved, and the magnetic adjustment range is wider.

The present invention belongs to the technical field of motor drive control, and proposes a switch reluctance motor control system and control method based on a four-level power circuit, including a four-level power circuit, a switch reluctance motor, a controller, a voltage sensor, a current sensor, a position sensor, and a capacitor protection circuit. Based on the high-voltage rapid excitation and high-voltage rapid demagnetization of the four-level power circuit and the function that the operation mode can be independently controlled when each phase of the motor is overlapped and turned on, the present invention solves the problem that the excitation current is difficult to establish and the demagnetization current has a long tail when the switch reluctance motor is running at high speed through the optimization of control strategy and control parameters, improves the operating efficiency of the switch reluctance motor drive system, and broadens the speed regulation range of the switch reluctance motor.

The electric saw comprises a machine shell, a saw blade is arranged at the front end of the machine shell, a handle is arranged at the rear end of the machine shell, a switch is arranged on the handle, a lifting handle is arranged at the position, close to the saw blade, of the machine shell, the two sides of the machine shell are each provided with a set of limiting blocks, and a sliding rod is arranged on each set of limiting blocks in a sliding and penetrating mode. The front ends of the two sets of sliding rods are jointly connected with a baffle. When the wood cutting device is used, the baffle is pushed to be located at a proper position according to the diameter size of cut wood, wood chips can be more effectively prevented from splashing, and the hands and the body parts of an operator are better protected.

The invention discloses a real gas flow high and low temperature verification system, which is characterized by comprising a verification real gas circulation loop, a real gas supply system, a standard module, a verification module and a flow driving regulation and control module, the device further comprises a temperature adjusting system and a verification control system. The real gas supply system is used for continuously outputting gas for verification used in the verification process, and an electric control valve is installed on a gas conveying pipeline at the output end of the real gas supply system. The etalon module comprises a standard meter; the verification module comprises at least one detected station which is connected in series; the flow driving regulation and control module comprises a fan and a flow regulation sonic nozzle group which are hermetically connected in series in the verification real gas circulation loop and are both adjustable in speed; the fan is a circulating fan, a centrifugal fan or an axial flow fan; the flow adjusting sonic nozzle set is composed of a plurality of critical flow venturi sonic nozzles which are connected in parallel and have multiple specifications of flow. The temperature control module is used for regulating and controlling the temperature of a conveying gas medium in the verification real gas circulation loop and the temperature of the environment where the verification module and the etalon module are located; and the verification control system is used for controlling the real gas supply system, the flow driving regulation and control module and the temperature control module.

The invention discloses a fan front-end speed regulation constant rotating speed output system and a design method thereof. The fan front-end speed regulation constant rotating speed output system comprises a wind wheel, a front-end speed regulation device connected with the wind wheel, a generator connected with the front-end speed regulation device, a transformer connected with the generator and a power grid connected with the transformer. The front-end speed regulation device comprises a low-speed rotor, a high-speed rotor, a stator winding and a frequency converter; a high-speed rotor of the front-end speed regulation device is connected with a rotating shaft of the generator, and a low-speed rotor of the front-end speed regulation device is connected with a rotating shaft of the wind wheel and fixed with the stator winding; according to the fan front end speed regulation constant rotating speed output method, automatic regulation can be conducted according to the rotating speed change of a wind wheel to ensure that the rotating speed of a generator is kept constant, so that the generator outputs electric energy with constant frequency, and a transmission chain has the advantages of being sensitive in speed regulation, large in speed regulation range, simple in structure, convenient to control, high in efficiency, low in maintenance cost, high in reliability and the like.

The invention discloses a polyimide film double-track dust-free oil-free imine furnace, and relates to the technical field of polyimide film production, the polyimide film double-track dust-free oil-free imine furnace comprises a furnace body, a pair of parallel track devices are arranged on the two sides of the furnace body, each track device is composed of an outer track and an inner track, and the inner tracks are arranged on the inner side of the furnace body; a driving wheel and a first driven wheel are arranged at the two ends of the furnace body respectively, the outer rail is arranged on the outer side of the furnace body, a main transmission auxiliary transmission device and a second driven wheel are arranged at the two ends of the outer rail respectively, and the driving wheel, the first driven wheel, the main transmission auxiliary transmission device and the second driven wheel are connected through a circulating conveying chain. Film tongs are uniformly mounted on the circulating conveying chain at intervals, the film tongs are connected with the circulating conveying chain through a connecting plate, and a plurality of rolling bearings in contact with the track are arranged on the connecting plate. Through structural innovation, the yield and quality in the thin film processing process are effectively improved.

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 present invention relates to the field of motors, and specifically to an adaptive weak magnetic disk motor. An adaptive weak magnetic disk motor comprises: a stator; a rotor, wherein the rotor comprises a rotor support and a guide magnetic disk, wherein the guide magnetic disk is assembled on the rotor support in a rotational manner, wherein the guide magnetic disk can slide axially relative to the rotor support, wherein permanent magnets are distributed on the end surface of the guide magnetic disk opposite to the stator, wherein a cavity with an axial depth decreasing radially is formed between the rotor support and the guide magnetic disk; and a centrifugal part, wherein the centrifugal part is accommodated in the cavity, wherein the centrifugal part moves radially outward under the centrifugal action to push the guide magnetic disk axially away from the stator. The invention solves the technical problems in the prior art that the motor needs to apply a weak magnetic current to perform weak magnetic control, which is inefficient, and improper control can easily cause demagnetization of the permanent magnet.

The application discloses an axial electric excitation mixed magnetic pole motor and belongs to the technical field of power generation, power transformation or power distribution. The motor comprises a stator, a rotor, a permanent magnet, an armature winding, an inner magnetic yoke, an outer magnetic yoke and an excitation winding, and two kinds of structurally similar but different motors can be generated through different matching forms among the components. The inner and outer magnetic yokes arranged in the stator and the rotor provide a magnetic flux path for the axial excitation of the two kinds of motors. One structure has a wide range of magnetic adjustment effect, and the excitation winding is connected with currents in different directions to increase or decrease the magnetism; the other structure has a complementary magnetic adjustment fault tolerance effect, when any section has an armature winding short circuit fault, the excitation current is applied to make the whole rotor periphery of the section present the same polarity, greatly weaken the peak-peak value of the magnetic linkage intersected by the armature winding of the section, inhibit the short circuit current, and the polarity of the rotor core pole of the non-fault section adjacent to the fault section is enhanced, so that the peak-peak value of the magnetic linkage intersected by the winding of the non-fault section is improved.

The invention provides a bench drill structure which comprises a main body, a workbench, a power motor and a drill bit assembly, a power shaft of the power motor is fixedly connected with a first driving wheel, the first driving wheel is provided with a plurality of first gear grooves which are coaxially arranged, the inner diameters of the first gear grooves are sequentially increased from top to bottom, the drill bit assembly is connected with a second driving wheel, and the second driving wheel is connected with the workbench. A plurality of coaxially arranged second gear grooves are formed in the second driving wheel, the inner diameters of the second gear grooves are sequentially increased from top to bottom, a third driving wheel is rotationally connected to the main body, the axes of the first driving wheel, the second driving wheel and the third driving wheel are parallel, and the third driving wheel is located between the first driving wheel and the second driving wheel; and a plurality of third gear grooves are formed in the third driving wheel, the inner diameters of the third gear grooves are sequentially reduced from top to bottom, the first gear grooves are connected with the third gear grooves through first belts, the second gear grooves are connected with the third gear grooves through second belts, and the purpose of improving practicability is achieved.

The invention discloses an annular direct-current busbar power system used in a ship dynamic positioning mode and a control method of the annular direct-current busbar power system. According to the annular direct-current busbar power system, due to the annular direct-current busbar networking mode, more flexible and rapid protection performance is achieved, that is, before a ship power grid is affected by faults, the frequency converter can rapidly detect abnormal conditions and actively complete isolation of fault points, so that the whole power grid and normal branches are not affected, and after the faults are eliminated, the frequency converter can rapidly detect the abnormal conditions and actively complete isolation of the fault points. And normal connection is quickly recovered. The variable-speed generator set is adopted in the system, the speed regulation range of the variable-speed generator set is expanded, the variable-speed generator set can automatically regulate the running speed according to loads, and load oil consumption can be always kept within an economic range, so that oil is saved, emission is reduced, the energy efficiency utilization rate of the generator set is remarkably improved, and the flexibility of the system is improved. The method is more suitable for ships with ship dynamic positioning working condition requirements.

The invention relates to the technical field of harvesters, in particular to an extended-range hybrid electric-driven harvester which comprises an extended-range power supply system, a power battery power supply system, a power management system and a power utilization system, the extended-range power supply system and the power battery power supply system are connected to the power management system in parallel, and the power management system is connected with the power utilization system. The two power supply systems are used as a source of energy of the whole harvester, the power management system is used for distributing electric power, and the power utilization system is used for driving all working parts of the extended-range hybrid power electric drive harvester to work. Therefore, double power supplies of extended-range power supply and power battery are adopted to provide power for the whole machine, sufficient endurance operation time is ensured, a motor type can save fuel oil, reduce carbon emission and improve operation precision, the electric power framework is a brand-new electric power framework, and a transmission path is simplified through motor direct drive, so that oil consumption and the failure rate of a transmission system are reduced, and the service life of the whole machine is prolonged. And the direct-drive response speed of the motor is high, and the speed regulation range is wide.

The invention relates to the field of motors, in particular to a wide-speed-regulation-range motor applied to a stirring system. The invention discloses a wide-speed-regulation-range motor applied to a stirring system. The wide-speed-regulation-range motor comprises a motor shell with a protection frame, the front end cover is fixedly connected to the front side of the motor shell, and the front end cover is communicated with the internal space of the motor shell; the rear end cover is fixedly connected to the rear part of the motor shell; and the motor control box is arranged on the outer side of the motor shell. The permanent magnet direct-driven motor is used as a power source in the stirring system, a permanent magnet material is used as a rotor excitation source, the speed regulation range is wide, the rotating speed can be adjusted according to the actual working condition, the closed-loop control system is adopted, the rotating speed can be accurately controlled, more accurate rotating speed and torque control is achieved, and the stirring efficiency is improved. The performance requirements of different torque densities, rotating speeds and the like are met, and work is efficiently completed.

The invention discloses a motor integrated with a speed reducer, the motor is sequentially connected with a plurality of planetary gear mechanisms and a connecting shaft used for outputting power, the motor is used for driving a sun gear of the closest planetary gear mechanism, and the sun gear of the subsequent planetary gear mechanism is driven by a planet carrier of the previous adjacent planetary gear mechanism; the planet carrier of the planetary gear mechanism farthest from the motor is used for driving the connecting shaft to rotate; planet carriers of the planetary gear mechanisms are disc-shaped, and the planet carriers of every two adjacent planetary gear mechanisms are connected with the sun gear through splines; a rotating shaft is arranged at the bottom of the planet carrier and rotationally connected with a planet wheel. The device is compact in structure, small in size and convenient to install.

The invention relates to the technical field of hydraulic power elements, in particular to a rotating and tilting tray type plunger pump which comprises a floating disc assembly, a plunger assembly, a cylinder body, a center rod assembly, a pump body, a pump cover and a flow distribution device. The floating disc assembly, the plunger assembly, the cylinder body and the center rod assembly are arranged in a containing cavity formed by connecting the pump body and the pump cover, the main shaft swash plate assembly is provided with a driving shaft end, the driving shaft end penetrates through a side hole in the end of the pump body to be exposed, the main shaft swash plate assembly is provided with an inclined plane and is matched with the floating disc assembly to restrain the plunger assembly, and the cylinder body is fixed to the pump cover. The plunger assemblies are arranged in plunger holes evenly distributed in the circumference of the cylinder body, and flow distribution devices are arranged between the plunger holes and the oil suction port and between the plunger holes and the pressure port.

The invention discloses a cylindrical linear motor magnetic suspension permanent magnet speed regulator and a speed regulation method. The cylindrical linear motor magnetic suspension permanent magnet speed regulator comprises a cylindrical linear motor, a radial two-degree-of-freedom hybrid magnetic bearing, a radial-axial three-degree-of-freedom hybrid magnetic bearing, a displacement detection ring and a cylindrical permanent magnet speed regulator. The linear motor drives the secondary rotor to linearly move along the axial direction according to a load signal, so as to drive the linear guide rail to axially move; the two hybrid magnetic bearing stators and the linear guide rail are fixed on the non-magnetic conductive plate, so that the two hybrid magnetic bearing stators can axially move along with the non-magnetic conductive plate, and the distance between the conductor ring and the permanent magnet ring is further changed; in order to ensure that a rotor of the axial three-degree-of-freedom hybrid magnetic bearing is located at the axial central position, the axial hybrid magnetic bearing is in a stable working state by adopting a mode of controlling current and suspension force. Compared with the prior art, the speed regulation device is simpler in structure, free of friction loss, long in service life and small in loss, and the speed regulation accuracy of the speed regulation device can be higher by adopting the magnetic suspension technology.

The present invention discloses a high-precision wide-range speed generating device. The device comprises: a control unit, which comprises a position sensor, an FPGA module and a microprocessor, wherein the position sensor is communicatively connected to the FPGA module, and the FPGA module is communicatively connected to the microprocessor; an electromechanical unit, which comprises a servo motor, an electronic converter, a gear speed increasing mechanism, a low-speed output shaft and a high-speed output shaft, wherein the servo motor is electrically connected to the electronic converter, mechanically connected to the gear speed increasing mechanism, and drivingly connected to the low-speed output shaft and the high-speed output shaft; and an input-output unit. The device is based on a servo motor, a two-stage high-precision gear speed increasing mechanism and FPGA technology to achieve wide-range generation and precise control of standard speeds of 0.1 to 100,000 r / min, and can complete accurate and reliable contact or non-contact wide-range speed detection calibration of tachometers, speed measuring instruments and speed sensors.

This invention relates to the field of permanent magnet motor technology, and more particularly to a dual-rotor hybrid excitation flux-switching permanent magnet motor with double-C staggered tooth and leakage flux control. It includes an outer rotor, a middle stator, and an inner rotor, with the middle stator positioned between the outer and inner rotors. The outer rotor has a plurality of first salient poles evenly distributed, and the inner rotor has a plurality of second salient poles evenly distributed. The middle stator includes m double-C staggered tooth iron cores, m rectangular leakage magnet cores, n tangentially magnetized Type I permanent magnets, an armature winding, a first set of excitation windings, and a second set of excitation windings. This invention not only retains the advantages of a compact structure and high efficiency of a dual-rotor flux-switching permanent magnet motor, but also, through the addition of the electrically excited excitation windings, makes the air gap magnetic field smooth and adjustable, effectively solving the problem of magnetic field coupling when the inner and outer motors work simultaneously. This also broadens the speed regulation range when the inner and outer motors work individually to a certain extent. Furthermore, the addition of leakage magnet cores solves the problem of strong permanent magnet magnetomotive force and difficulty in weakening the magnetomotive force.

The present invention relates to a control method and system for variable magnetic flux of a permanent magnet synchronous motor, and the control method includes: obtaining the motor speed and current value of the permanent magnet synchronous motor; obtaining the magnetization direction of each magnetic steel according to the current value and the motor speed; confirming whether to charge and demagnetize the magnetic steel according to the motor speed of the permanent magnet synchronous motor and the magnetization direction of each magnetic steel; when charging and demagnetizing the magnetic steel, generating a direct-axis pulse current according to the motor speed and the current value to charge and demagnetize the magnetic steel. The embodiment of the present invention obtains the motor speed and current value of the permanent magnet synchronous motor, and confirms the magnetization direction of each magnetic steel of the permanent magnet synchronous motor according to the motor speed and the current value, confirms whether charging and demagnetization is required according to the motor speed and the magnetization direction, and generates a direct-axis pulse current to charge and demagnetize the magnetic steel when charging and demagnetization is required, and changes the strength of the magnetic field inside the motor in real time, so as to expand the speed range of the motor without passing a weak magnetic current.

This utility model discloses an automatic ink printing proofing machine, including a frame assembly. A scraping platform is provided on the top of the frame assembly, and a scraping component is provided on the top of the scraping platform. The scraping component consists of a scraper assembly, two clamping components, two scraper Z-axis adjusting components, two rubber roller Z-axis adjusting components, and a rubber roller assembly. The rubber roller assembly is located on one side of the scraper assembly. The two scraper Z-axis adjusting components are located on the front and rear sides of the scraper assembly, respectively. The two rubber roller Z-axis adjusting components are located on the front and rear sides of the rubber roller Z-axis adjusting component, respectively. A drive assembly is provided inside the frame assembly. The drive assembly consists of a motor assembly, a synchronous pulley, and a synchronous belt. The motor assembly is installed inside the frame assembly, and a synchronous pulley is installed at the power output end of the motor assembly. A synchronous belt is connected to the outer side of the synchronous pulley, and guide rods are provided above and below the synchronous belt.

The invention belongs to the technical field of alternating current motors and driving control, discloses a three-phase series winding motor three-dimensional space vector modulation strategy and an overmodulation processing method, and aims to improve the control performance of a three-phase series winding motor and provide positive zero-sequence current suppression capability. The invention provides a three-phase series winding motor three-dimensional space vector modulation strategy based on a space slicing method and an overmodulation strategy thereof, a series winding motor three-dimensional linear modulation area is effectively expanded, a simple and effective basic voltage vector selection table is provided, and an accurate linear modulation area mathematical model is given. In addition, a corresponding three-dimensional overmodulation method is provided, and the control performance of the series winding motor in a linear modulation area and an overmodulation area is improved.

The ballast bed spraying device comprises a water tank and two water outlet pipelines arranged at the bottom of a vehicle body side by side, a plurality of nozzles are arranged on each water outlet pipeline side by side, one end of each water outlet pipeline is open, the other end of each water outlet pipeline is closed, and the open end of each water outlet pipeline is communicated with the water tank through a connecting pipe. After the connecting pipe is connected out of the water tank, a water pump, an electromagnetic valve and a flow meter for detecting the water flow in the pipeline are sequentially arranged on the pipeline; the water pump is controlled by a motor; the controller is used for collecting signals of the flow meter and further controlling the rotating speed of the motor and on-off of the electromagnetic valve; one of the water pumps on the two connecting pipes is a small-displacement water pump, and the other water pump on the two connecting pipes is a large-displacement water pump. The two water pumps adopt a large displacement configuration and a small displacement configuration, so that not only can high-precision variable control in a small displacement range and a medium displacement range be met, but also high-precision variable control in a large displacement range during full displacement output of the two water pumps can be met.

The utility model discloses a DC brushless permanent magnet synchronous external rotor motor used for an industrial ceiling fan, comprising an external rotor, an upper cover, a lower cover, a central shaft, a stator and an external driver, the periphery of the upper cover is provided with at least three groups of first connecting plates used for connecting fan blades, and the stator is installed in an internal cavity formed by the external rotor, the upper cover and the lower cover. The center shaft sequentially penetrates through center holes of the upper cover, the stator and the lower cover, and the upper cover, the lower cover, the first deep groove ball bearing and the second deep groove ball bearing form rotary dynamic sealing through framework oil seals. The stator comprises an iron core and a coil wound in the iron core, and a plurality of pieces of magnetic steel are adhered to the inner wall of the outer rotor at equal intervals. The magnetic steel is adopted to replace a rotor winding, excitation current is not needed, the loss of the motor is reduced, the efficiency of the motor is greatly improved, the speed regulation range is wide, a speed reduction device can be omitted, motor elements are reduced, and the manufacturing cost of the motor is saved. Meanwhile, the overall size and weight of the industrial ceiling fan are reduced, and installation is convenient.

The invention discloses an ice pod propulsion motor winding structure, which comprises a stator iron core, a torque control coil and a magnetic field modulation coil, four layers of independent coils are arranged in each stator slot, the original double-layer winding is decoupled into torque control and magnetic field modulation, the winding process and the coil inserting process can be simplified after decoupling, and the winding efficiency is improved. The length of the end portion of the coil can be effectively shortened, the overall size of the motor can be effectively reduced, the stator has two sets of independent coil control modes in the control aspect, the motor has higher overload capacity and speed expansion capacity, the double-winding design in the same groove simplifies the process of the double-winding design, and the scheme of the motor has certain redundancy. When one set of winding breaks down, the other set of winding can still operate in a short time, and after the permanent magnets are demagnetized under an extreme condition, the two sets of independent windings can still keep the motor to operate in a short-time overload mode.

The invention discloses a coaxial output double-flow transmission continuously variable transmission which comprises a planetary gear transmission mechanism and a hydraulic transmission mechanism. The input end of the planetary gear transmission mechanism is coaxially and fixedly connected with the input shaft, the first output end of the planetary gear transmission mechanism is coaxially and fixedly connected with the third gear, the second output end of the planetary gear transmission mechanism is connected with the input end of the hydraulic transmission mechanism through the gear mechanism, and the output end of the hydraulic transmission mechanism is connected with the fourth gear. The third gear and the fourth gear are in meshed connection; and the third gear is coaxially and fixedly connected with the main output gear. The invention further discloses a coaxial output double-flow transmission stepless speed change method. The coaxial output double-flow transmission continuously variable transmission is not provided with a clutch / brake, so that the failure rate is low; and the gear transmission structure is simpler, so that the whole mechanical structure is simple, and the manufacturing cost is low.

The invention relates to a milling machine spindle dynamic balance testing device, which relates to the field of mechanical balance testing, and comprises a magneto-rheological damper array arranged around a spindle, a sensing assembly used for collecting multi-source vibration signals, a double-closed-loop control mechanism and a chuck assembly, the magneto-rheological damper array comprises a plurality of damping units which are evenly distributed in the circumferential direction of the main shaft, an acute included angle is formed between the force application direction of each damping unit and the axis of the main shaft, and the sensing assembly comprises an axial acceleration sensor located on the end face of the main shaft and a plurality of radial acceleration sensors distributed in the axis direction of the main shaft. The double-closed-loop control mechanism comprises an inner ring damping control unit and an outer ring counterweight decision-making unit, and the chuck assembly is matched with the main shaft positioning conical surface. The method and the device have the effects of realizing active suppression of high-frequency vibration and rapid identification of the unbalance amount.