157results about How to "Simple and reliable control method" patented technology

The invention relates to a rollover preventing tank truck. A truck body is hinged to a tank, a hinged axis is in the truck body extending direction, a driving mechanism is arranged between the truck body and the tank, and the driving mechanism is used for adjusting the tank to rotate along the hinged axis. The tank rotates along the hinged axis, so as to carry out real time adjustment to the state of the truck body, and prevent the occurrence of rollover.

The invention discloses a position-sensor-free control method suitable for four-quadrant operation of a switch reluctance motor, and belongs to a switch reluctance motor control method. The position-sensor-free control method comprises the following steps of constructing a simplified inductance model according to a fourier series expression of inductance of the switch reluctance motor; fitting a function relation in which an inductance model parameter is changed along with phase current by measuring inductances at three special positions of the switch reluctance motor at different phase currents on line, and constructing a non-linear inductance model of the switch reluctance motor; deriving an analysis formula for estimating a position of a rotor of the switch reluctance motor through phase inductance according to the non-linear inductance model; and when the motor runs, detecting the phase current and phase voltage in real time, estimating an excitation phase magnetic chain according to a voltage equation to obtain excitation phase inductance, calculating the current position of the rotor according to the estimation analysis formula by using the derived position of the rotor, and realizing sensor-free running control over the switch reluctance motor according to the estimated position of the rotor. The algorithm is simple, small in calculated amount, favorable for real-time implementation of a micro controller and higher in position estimation precision.

The invention provides a control method of a heat pump system. The control method comprises steps as follows: the liquid pipe temperature at an outlet of a condenser, the discharge pressure of a compressor, the high-pressure saturation temperature corresponding to the discharge pressure and the discharge temperature of the compressor are acquired; the actual super-cooling degree is calculated according to the high-pressure saturation temperature and the liquid pipe temperature at the outlet of the condenser; the actual discharge superheat degree is calculated according to the discharge temperature and the high-pressure saturation temperature; the target super-cooling degree is acquired according to the actual discharge superheat degree of the compressor; whether the actual super-cooling degree is larger than the target super-cooling degree or not is judged, and if the actual super-cooling degree is larger than the target super-cooling degree, the actual super-cooling degree is reduced by adjusting the opening degree of a throttling device; and if the actual super-cooling degree is not larger than the target super-cooling degree, the actual super-cooling degree is increased by adjusting the opening degree of the throttling device. The invention further provides the heat pump system. With the control method of the heat pump system and the heat pump system, the accuracy of gas filling liquid detection and judgment of the system is improved, and the compressor is prevented from producing liquid impact, so that long-time reliable running of the compressor can be guaranteed.

The invention provides an excitation control device of a brushless doubly-fed motor independent power generation system and belongs to a power generation control device for a brushless doubly-fed motor. According to the technical scheme of the invention, the defects in the prior art that, an existing scalar control method is poor in dynamic performance and a conventional bisynchronous rotating reference frame is complicated in vector control, high in cost and low in efficiency can be overcome. According to the technical scheme of the invention, the device comprises a PW voltage magnitude controller, a PW voltage frequency controller, a CW current vector controller, an LC filter, a rotating speed calculator, a CW current frequency feed-forward amount calculator, a PW voltage phase-locked loop and a PW current converter. The CW current vector controller of a brushless doubly-fed motor is adopted as an inner ring, while the PW voltage magnitude controller and the PW voltage frequency controller of the brushless doubly-fed motor are adopted as an outer ring. In this way, the PW voltage magnitude and the PW voltage frequency are independently controlled. Meanwhile, a cross feed-forward compensation mechanism is adopted in the CW current vector controller, so that the device is faster in response rate and better in stability precision. The constant-frequency and constant-voltage generating function of the brushless doubly-fed motor independent power generation system in the speed-varying and load-varying condition is realized.

The invention discloses a blowing device, a control method thereof and a method for generating control data of the blowing device. The blowing device disclosed by the invention comprises a data input module used for receiving natural wind sampling data, and a control module used for controlling the blowing device to blow out wind corresponding to the natural wind sampling data based on the natural wind sampling data. Through the blowing device, the natural wind of the nature can be restored, a user can feel the really natural wind and feel the comfortableness of the natural wind, and the use experience of the user is improved.

The invention relates to a modular self-reconfigurable robot and a method for controlling the deformation of the modular self-reconfigurable robot. The modular self-reconfigurable robot is formed by connecting monomers and can be in a ''-'' configuration and a ''+'' configuration. The initial configuration of the modular self-reconfigurable robot is the ''-'' configuration and comprises a head module, a middle module and a tail module; when a deformation control command is received, the butting mechanisms of the head module, the tail module and the middle module separate, and the middle module rotates until the middle module is perpendicular to the head module and the tail module. The process for butting automatically comprises the steps of adjusting the initial relative angle, the relative angle deviation and the relative displacement deviation of the butted surfaces and locking the abutting mechanism. Therefore, the head module, the tail module and the middle module are finally abutted, the change of the modular self-reconfigurable robot from the ''-'' configuration to the ''+'' configuration, and the change from the ''+'' configuration to the ''-'' configuration can be realized. The monomers can be separated and butted easily and effectively, and the change of the ''-'' configuration and the ''+'' configuration of the modular self-reconfigurable robot between the can be realized.

The inventiondiscloseslean ceramic powder size for direct-forming 3D ceramic printing. The lean ceramic powder size is prepared from lean ceramic powder, a composite thixotropic agent, a dispersing agent, a thickening agent, a levelling agent and deionized water in a mass ratio being (65-75):(0.2-0.6):(0.9-1.3):(2.0-5.0):(0.5-1.5):(15-30); the lean ceramic powder is one or combination of Al2O3, ZrO2, SiC and Si3N4. The invention further discloses a preparation method and an application of the lean ceramic powder size. The lean ceramic powder size has high solid content and high shear thinning performance, is suitable for preparation of 3D printing ceramic devices with direction forming process and can be gradually dried and cured in a 3D printing process at the room temperature, and accordingly, a set structure is obtained without collapse, the printing precision is high, and the requirement for 3D printing direct-forming can be well met.

The invention discloses a pressure cooking appliance. The pressure cooking appliance comprises a pot body, a pot cover, a locking assembly for locking the pot cover and the pot body, a heater for heating the pot body, a cooler used for cooling the pot body and / or the pot cover and a controller. The controller is connected with the locking assembly, the heater and the cooler, obtains a midway uncovering point, starts the cooler at the midway uncovering point to conduct cooling to enable the locking assembly to end locking between the pot body and the pot cover when the pressure in the pressure cooking appliance to be smaller than or equal to a preset pressure. By means of the pressure cooking appliance, the cooler is used for rapidly reducing the pressure in the pressure cooking appliance to reach the safe pressure of midway uncovering, the aim of rapidly opening the pot cover is accordingly achieved in the cooking process, and the requirements of a user are met. The invention further discloses a control method of the pressure cooking appliance and another pressure cooking appliance.

The invention relates to a multi-module parallel DC power supply and a control method of the DC power supply. The multi-module parallel DC power supply comprises a monitor system and N DC power supply modules, wherein the monitor system includes a serial communication system, human-machine interaction equipment, and a digital control circuit; and the digital control circuit is respectively connected with the serial communication system and the human-machine interaction equipment. The control method comprises subjecting the output parameters and the set output parameters of all of the working DC power supply modules in each control period to corresponding control computation to make each DC power supply module to output current according to requirement and to realize current equalization. The multi-module parallel DC power supply provided by the invention can realize constant voltage or constant current function according to requirement, and is simple in process, few in wiring, easy in maintenance and so on. The control method of the power supply is simple in operation and reliable in control by adopting digital control. In constant voltage model, the dynamic performance of the multi-module parallel DC power supply is improved greatly, so that the multi-module parallel DC power supply can be directly applied in the digital DC power supply parallel connection system.

A competition model RS-485 bus multimaster communication system and a working method thereof relate to a communication system. At present, the data transmission time of the nodes on an RS-485 bus is long, and the nodes only can detect the conflict of the bus while can not avoid actively, once the conflict occurs, competition needs to be carried out again. The competition model RS-485 bus multimaster communication system of the present invention comprises a plurality of nodes and an interface chip, and is characterized in that the nodes are equipped with an XNOR gate circuit, a double-path D-type rising edge trigger and an XOR gate circuit, and the output end of the XOR gate circuit and a node receiving signal end are connected with the interface chip; a first resistor is arranged between the anode output end of the interface chip and the anode of a power supply, and a second resistor is arranged between the cathode output end of the interface chip and a grounding end. The competition model RS-485 bus multimaster communication system and the working method thereof of the technical scheme are based on a hardware conflict detection mode, and take the bit as the unit. Once the conflict occurs, the failed party quits automatically, and the party obtained the control right can send the data continuously, thereby guaranteeing that the data is sent correctly.

The invention provides a mobile robot control system and a teleoperation control method of a robot tail end pose, and particularly relates to the mobile robot control system and the teleoperation control method of the robot tail end pose based on wearable binocular vision specific to a carrying multi-degree-of-freedom mechanical arm. The process of the control method is the pose of an operator gesture-the pose of a virtual gesture model-the pose of the tail end of a virtual mechanical arm-the pose of the tail end of a multi-degree-of-freedom mechanical arm; and the continuous control on the pose of the tail end of the multi-degree-of-freedom mechanical arm is realized by establishing the driving relationship of the pose of the operator gesture and the pose of the tail end of the multi-degree-of-freedom mechanical arm. Meanwhile, the following process of the tail end of the virtual mechanical arm and the virtual gesture model is displayed in a wearable virtual displayer, so that the control process is relatively intuitive so as to solve the problems that in the control process of a vehicle-mounted multi-degree-of-freedom reconnaissance system of an existing mobile reconnaissance robot, the control method is complicated, and the pose of the tail end of the vehicle-mounted multi-degree-of-freedom reconnaissance system cannot be intuitively controlled.

The invention relates to a medicine storing tank type rapid medicine dispensing machine, and provides a full-automatic symmetrical double-kit type medicine dispensing mechanical device and a control method thereof. A positioning system utilizes a combination of a servo positioning module and a mechanical positioning and utilizes a plane right-angle robot type structural design, and the medicine dispensing mechanical device is placed at the rear end of a medicine storage cabinet. Under the action of a drive device, a medicine kit platform can rapidly move along an X direction and a Y direction, two medicine kits on the medicine kit platform can be sent to a medicine storing track along a Z direction under the action of a drive motor, when the two medicine kits arrive at a target location, an automatic door opening device is opened, under the action of the gravity, medicine boxes in the medicine kits can slide to the front end of the track along an inclined plane of the medicine storing track to be in a butt joint connection with a medicine discharging mechanism, and each motion is controlled by a control system to be automatically completed. The full-automatic symmetrical double-kit type medicine dispensing mechanical device and the control method thereof have the advantages that a symmetrical double-kit medicine adding mode is utilized, the processed medicine quantity is large, the medicine dispensing speed is rapid, the positioning is rapid and high in accuracy, and the automated management for medicines in pharmacies is convenient.

The invention discloses a control method of a photovoltaic inverter. The control method includes the steps of detecting direct-current voltage of direct-current input side of the photovoltaic inverter in real time; detecting alternating-current voltage and alternating current of the alternating-current output side of the photovoltaic inverter; and according to the direct-current voltage, the alternating-current voltage and the alternating current, controlling start and stop of the photovoltaic inverter. According to the control method, start and stop of the photovoltaic inverter can be controlled according to the direct-current voltage, the alternating-current voltage and the alternating current detected in real time, start voltage of the photovoltaic inverter can be adjusted in time in different areas and seasons, electric energy of a solar cell array is converted into alternating current as much as possible, sent to a power grid, utilization efficiency of the electric energy of solar panels is greatly improved, no auxiliary equipment is required, the cost of the photovoltaic inverter is decreased, and start-stop control is simplified for the photovoltaic inverter. The invention further discloses the photovoltaic inverter and a photovoltaic power generation system with the photovoltaic inverter.

The invention discloses a frequency conversion control method and device for a single-inductor dual-output switch converter in a continuous conduction mode. By limiting inductive current peak and valley, the control on a main switch tube and branch switch tubes in the converter is finished and independent adjustment of each output branch is realized. Compared with a conventional single-inductor dual-output switch converter working in a continuous conduction mode, the frequency conversion control method and device have the advantages of good stability, high reliability, strong anti-jamming capability, high input or load transient response speed, little cross influence of the output branches and the like, and can be used for controlling various converters with single-inductor dual-output topological structures, such as a Buck converter, a Boost converter, a Buck-boost converter, a Bipolar converter and the like.

The invention discloses a position-sensorless control method suitable for running of a switched reluctance motor in a whole-speed range, and belongs to control methods of switched reluctance motors. A function relationship among a rotor angle, an inductance coefficient and three phases of inductances is set up based on a complex plane induction model of the switched reluctance motor; when the switched reluctance motor is static or is started under the initial rotating speed condition, a pulse injection method is adopted to obtain the three phases of inductances; when the switched reluctance motor runs at the low speed, a free phase pulse injection method is adopted to set up a function relationship of the sum of the three phases of inductances, and therefore conduction phase inductances are obtained; when the switched reluctance motor runs at the high speed, current is divided by an integral magnetic chain, so that reference phase inductances are obtained; a rotor position obtained through derivation is utilized for estimating an analytic expression and calculating the current position of a rotor, and according to the estimated rotor position, the position-sensorless run control over the switched reluctance motor can be achieved. The method is simple and small in calculated amount, a controller can easily run in the whole-speed range, and the higher position estimation precision is achieved.

The invention discloses a humidity detection assembly for a microwave oven. The humidity detection assembly comprises a humidity sensor and a detection circuit, wherein the humidity sensor comprises a first electrode and a second electrode, wherein the first electrode is a metal electrode, the second electrode is a piezoelectric detection electrode, the quantity of electric charge on the second electrode is changed along with the change of the humidity in wet gas; the detection circuit is connected with the humidity sensor, and can generate a humidity detection signal according to the quantity change of the electric charge on the second electrode in the humidity sensor. The humidity detection assembly can realize the accurate detection on the humidity in the cavity in microwave oven cooking when being used for the microwave oven, and is low in cost and reliable in performance. The invention further discloses a microwave oven provided with the humidity detection assembly and a control method of the microwave oven.

The invention discloses a control circuit of a backlight module and a control method thereof, the structure of the circuit is that a brightness sensor is arranged in a cavity of a liquid crystal display module, the sensor is used for collecting brightness signals and transmitting the brightness signals to a controller, after a system is electrified, the controller can output PWM (pulse width modulation) waves corresponding to the appointed dimming level for illuminating a backlight lamp, data of the sensor during a high duty ratio section and a low duty ratio section of the PWM waves is collected respectively, normalization treatment is performed on the collected data for eliminating differences in the sensors and sampling errors, the collected data during the high duty ratio section needs to deduct the data during the low duty ratio section, the data after amendment is compared with a set standard value for judging whether the two are the same or not, if the amended data is greater than the standard value, the brightness drive data of the backlight lamp is reduced, if the collected data is less than the standard value, the brightness drive data of the backlight lamp is increased. The circuit of the system is simple and reliable, the problem of misoperation of backlight brightness feedback control under strong light irradiation is solved, and the accuracy is high.

The invention belongs to the technical field of control of a wind force generation main control system, and discloses a deloading control method of primary frequency modulation of a wind force generator set. According to the condition that a variable pitch wind turbine generator set has different wind energy catching efficiency at different propeller pitch angles and different blade tip speed ratios, based on integrating advantages and disadvantages of a superspeed method and a propeller pitch angle control method during power standby application and control, a propeller pitch angle control strategy is used to realize deloading control of primary frequency modulation of a wind force generator set. The control method comprises a standby application control strategy for three kinds of powerat low wind speed, middle wind speed and high wind speed. The control method is simple and reliable. Alleviation of the mechanical wear and tear of the device caused by frequent regulation of propeller blades of a wind force generator set during primary frequency modulation deloading operation, is facilitated.

The invention discloses a combined type DC transformation system and a control method thereof, and belongs to the technical field of power electronic transformers. The combined type DC transformationsystem is composed of a DC transformer, a double-input or double-output DC transformer and a non-isolated DC transformer. The combined type DC transformation system directly transfers most input powerto a load, system power loss is reduced, and the system efficiency is improved; the DC transformer and the double-input and double-output DC transformers work in open loop in the optimal state, circuit parameters are optimized in design, and the total efficiency is improved further; and the combined type DC transformation system is especially suitable for high-efficiency reliable large-power DC-DC electric energy transformation occasions including aerospace, military weapons, smart power grid, new energy power generation, new energy automobile and data center power supply systems.

The invention relates to a direct-current power supply asynchronous parallel digital control system and a control method thereof. The direct-current power supply asynchronous parallel digital control system comprises a monitoring system and N direct-current power supply modules, wherein N is greater than or equal to 2. The monitoring system comprises a DSP control circuit, a serial communication circuit, man-machine interaction equipment, an asynchronous control circuit and a feedback circuit, wherein the DSP control circuit is respectively connected with the serial communication circuit, the man-machine interaction equipment, the asynchronous control circuit and the feedback circuit. The direct-current power supply asynchronous parallel digital control system of the invention can enable asynchronous and orderly work of the multiple power supply modules to be realized as required, actually control parallel output waveform and enable constant-voltage, constant-current or constant-power control of a power supply system to be quickly realized; the system has the advantages of simple process, less wiring, convenient maintenance and the like; and the system adopts a digital control method which is simple to operate and reliable in control, greatly improves the dynamic performance of the system in a constant-voltage mode and can be directly applied to a digital direct-current power supply parallel system.

The invention discloses an MPPT control system and method for a small-power wearable photovoltaic system.The MPPT control system comprises a solar cell, a filter capacitor C1, a DC-DC conversion unit, an open-circuit voltage sampling unit, a working voltage sampling unit, an MCU processor, a filter capacitor C3 and an energy storing unit.Sampling measuring is conducted to acquire the open-circuit voltage Uoc and the output voltage Vpv of the solar cell; controlling is conducted based on the approximate proportion relation of about 0.8 Uoc of the voltage Um at the maximum power point, the duty ratio of the DC-DC conversion unit is adjusted, and the output voltage Vpv of the solar cell is changed so that the solar call can work near the maximum power point; the working voltage Vpv1 and the working voltage Vpv2 of the solar cell are compared; if the difference of the Vpv1 and the Vpv2 is larger than voltage Q, an open-circuit voltage sampling switch Q2 is opened, and sampling measuring is conducted to acquire the open-circuit voltage Uoc; the duty ratio of the DC-DC conversion unit is adjusted, and the output voltage of the solar cell is changed.Maximization of energy collection can be achieved.

The invention discloses a frequency conversion control method of an independent charging and discharging timing sequence single-inductance double-output switching converter and a frequency conversion control device. Control on a main switch tube and a branch switch tube of the converter is finished through limiting the amplitudes of a capacitive current peak and a capacitive current valley, and independent adjustment on various output branches is achieved. Compared with a traditional independent charging and discharging timing sequence single-inductance double-output switching converter, the independent charging and discharging timing sequence single-inductance double-output switching converter disclosed by the invention has the advantages of being good in stability, high in reliability, wide in load range, high in anti-jamming capability, high in input and load transient response speeds, small in cross influence among the output branches and the like, and can be used for controlling various converters, such as a Buck converter, a Boost converter, a Buck-boost converter, a Bipolar converter and the like, with a single-inductance double-output topological structure.

The invention discloses a water heater which comprises a controller, an interface and a WIFI (Wireless Fidelity) module, wherein the controller at least comprises a sending pin, a receiving pin, an enabling pin, a power supply pin and a grounding pin; the WIFI module comprises a power supply end, a grounding end, a data sending end and a data receiving end; the data sending end is connected with the receiving pin by a first end of the interface; the data receiving end is connected with the sending pin by a second end of the interface; the grounding end is grounded by a third end of the interface; the power supply end is connected with the enabling pin by a fourth end of the interface; the WIFI module sends heartbeat data packets to the controller at intervals of preset time; the controller judges whether the heartbeat data packets are received and outputs a control signal to control the WIFI module to be reset by the enabling pin if the heartbeat data packets are not received. According to the invention, power supply of the WIFI module is controlled by the enabling pin of the controller, so that under the condition that the WIFI module is crashed, the WIFI module can be controlled to be reset. The invention also discloses a control method of the water heater.

The invention discloses a roller washing machine which comprises an inner barrel, a motor, a detecting module and a control module, wherein an outer barrel. The inner barrel is arranged inside the outer barrel, and the inner barrel and the outer barrel are arranged with the same shaft, the motor is connected with the inner barrel, the inner barrel is driven to rotate relatively to the outer barrel by the motor, the detecting module is arranged outside of the outer barrel, shocks of the outer barrel are detected to produce detecting signals by the detecting module, the control module is connected with the detecting module and the motor, the detecting signals are disposed by the control module to obtain a washing state of clothes inside the inner barrel, and a rotating speed of the motor is controlled according to the washing state of the clothes. The roller washing machine has the advantages of being short in washing time, high in cleaning rate, saving in energy and environment-friendly. The invention further discloses a control method of the roller washing machine.

The invention discloses a hybrid power drive system. The hybrid power drive system comprises a first planetary gear train, a second planetary gear train, an engine, a first electric motor generator, a second electric motor generator, a first brake, a second brake, a third brake, a front axle, and a rear axle. The first planetary gear train comprises a first sun gear, a first planet gear, a first planet carrier, and a first gear ring. The second planetary gear train comprises a second sun gear, a second planet gear, a second planet carrier, and a second gear ring. The first gear ring and the second sun gear are connected and rotate synchronously. A clutch is arranged between the engine and the first sun gear. The first electric motor generator and the first planet carrier are connected. The second electric motor generator and the second gear ring are connected. The first brake is used to brake the first planet carrier. The second brake is used to brake the first gear ring. The third brake is used to brake the second gear ring. A power transmission shaft with the clutch is arranged between the front axle and the rear axle. The hybrid power drive system is simple in structure and reliable in transmission.

The invention provides a switched reluctance motor variable-angle PI control method, a switched reluctance motor variable-angle PI controller and a switched reluctance motor speed adjusting system. The switched reluctance motor variable-angle PI control method comprises the steps of: regarding an absolute value of an output signal of a traditional rotary speed PI controller as a reference current of a current chopping controller, switching turn-on and turn-off angles of each phase according to positive and negative output of the traditional rotary speed PI controller, placing the turn-on and turn-off angles of each phase in a forward torque region when the output is negative, and outputting forward torque by a motor; otherwise, turning over the turn-on and turn-off angles to a backward torque region by taking theta=theta<r / 2> as a symmetry axis, and outputting backward torque by the motor. According to the switched reluctance motor variable-angle PI control method, the switched reluctance motor variable-angle PI controller and the switched reluctance motor speed adjusting system, the switched reluctance motor can output torque opposite to a given rotary direction when the given rotary direction is fixed, the dynamic response speed in the cases of sudden reduction of a given rotary speed and sudden unloading when the given rotary direction is fixed is accelerated, the switched reluctance motor has a loading capacity under the situation that the given rotary direction is opposite to a load direction, and the control method is simple and reliable, high in universality and easy to popularize.

The invention discloses a control method of an electric rice cooker. The electric rice cooker comprises a body, an upper cover capable of covering the body, an inner pot disposed in the body, and a froth detector disposed on the upper cover. The control method includes the steps of after starting the electric rice cooker to operate for cooking, enabling the froth detector to detect whether froth in the inner pot reaches a preset rise height; if yes, judging the number of times of the froth reaching the preset rise height or cooking time of the electric rice cooker so as to judge whether the electric rice cooker finishes cooking. The control method ensures cooked food is effective and satisfactory to users even when the users use no measuring cup or graduation of the inner pot, and brings great convenience to users. The invention further discloses the electric rice cooker.

The invention discloses a single-loop pulse regulating and controlling method and device of a switch power supply working in a pseudo continuous mode. The method is as follows: during the starting time of each on-off cycle, the effective control pulse in the on-off cycle is selected according to relation between the output voltage Vo and reference voltage Vref voltage of a switching converter. The selection rules of the control pulse are as follows: if Vo is less than Vref, the control pulse PH1 and PH2 are adopted to separately control the switching tube S1 and S2 in the pseudo continuous switching converter; and if Vo is more than Vref, the control pulse PL1 and PL2 are adopted to separately control the switching tube S1 and S2. The duty-cycle and time sequence of each control pulse are both preset and fixed values. The method can be used to control the high power switching converter working in the pseudo continuous mode, the control technology is easy and practical, the stability and anti-interference ability are good, the working range of the converter is wide, the dynamic performance is good and the method is applicable to switching converters with various topological structures.

The invention relates to a constant-current and constant-voltage composite type floating hydrostatic guide rail, which comprises a main guide rail (1), a reverse preloading guide rail (2), a base (3) and a worktable surface (4), wherein the main guide rail (1) and the reverse preloading guide rail (2) form a closed type hydrostatic guide rail to realize a supporting function, the main guide rail (1) is a constant-current hydrostatic guide rail, and consists of a movable guide rail and a fixed guide rail, the main guide rail (1) on the worktable surface (4) is the movable guide rail, the main guide rail (1) on the base (3) is the fixed guide rail, and the reverse preloading guide rail (2) is the constant-current and constant-voltage composite type floating hydrostatic guide rail. The constant-current and constant-voltage composite type floating hydrostatic guide rail has the advantages that a high-speed and low-speed indexing function of a rotary table is met, and an assembly process and a control method are simple and reliable.