77 results about "Magnetic levitation system" patented technology

The invention discloses a magnetic suspension non-contact driving self-balancing precision machine core which comprises a metal disc, a magnetic suspension assembly is arranged at the top of the metal disc, a connecting assembly is arranged on the magnetic suspension assembly, a pluggable stable supporting assembly is arranged on the metal disc, the magnetic suspension assembly comprises a Halbach annular permanent magnet array and an electromagnetic coil, and the Halbach annular permanent magnet array is connected with the connecting assembly. The Halbach annular permanent magnet array is installed at the top of the metal disc, and the electromagnetic coil is installed at the top of the metal disc and located in the Halbach annular permanent magnet array. Through composite magnetic suspension driving of the Halbach annular permanent magnet array and the electromagnetic coil, no mechanical contact exists between the suspender and the metal disc, the friction loss of traditional gear meshing is eliminated, no lubrication requirement exists, the problem of lubricating grease volatilization or aging is avoided, the stable supporting assembly is controlled through a pressure sensor and an electric push rod in a closed-loop mode, and the stability of the stable supporting assembly is improved. The height of the supporting column is adjusted in real time, so that the whole device is in a horizontal state, and the magnetic suspension system is not affected by inclination of a mounting plane.

The invention discloses a modularized magnetic type cloth pressing guide roller of a cloth paving machine, and relates to the technical field of cloth paving machines. An adjusting assembly used for adjusting is fixedly arranged on the side face of the front end of the cloth paving machine. The modular guide roller is rotationally mounted at the top of the side face of the adjusting assembly, through physical butt joint of a conical boss and an annular groove on the side face of a guide roller body and the attraction design of a magnetic sealing ring, the modular guide roller can be quickly positioned and connected with the connecting assembly, and the distance between a telescopic pipe and the guide roller body is dynamically adjusted through an electromagnetic driving mechanism of the connecting assembly; the axial connection tightness is ensured; a magnetic suspension system controlled by closed-loop feedback of an electromagnet and the rotating action of a guide roller body are combined, non-contact and zero-friction transmission of cloth is achieved by adjusting the magnetic field intensity in real time and integrating airflow guide and heat dissipation design, and a full-circle low-friction contact interface is dynamically formed by means of a self-adaptive tension compensation structure of a metal wire assembly. And a modular guide roller structure with high reliability and dynamic self-adaptive capability is realized through the synergistic effect.

The invention provides a heat dissipation control method, an evaporation cold magnetic suspension system and an air conditioner. The evaporation cold magnetic suspension system of the air conditioner comprises a heat pipe air wall, a compressor, a first air guide pipeline and a second air guide pipeline, wherein the heat pipe air wall comprises a fan and a heat pipe; according to the system and the method, the low-temperature airflow on the upstream side of the draught fan is directly used for cooling and dissipating heat for the compressor in the low-load state, and part of the low-temperature airflow is used for improving the refrigeration effect of the whole system through the heat pipe while the low-temperature airflow on the upstream side of the draught fan is used for cooling and dissipating heat for the compressor in the high-load state; and in addition, the air flow passing through the heat pipe is synchronously transmitted to the compressor to further cool the compressor, so that the heat dissipation effect of the compressor is improved. The air flow in the heat pipe ventilation wall is fully and reasonably utilized, so that the cooling and heat dissipation effect of the evaporation cold magnetic suspension system on key devices at a compressor is improved.

The invention belongs to the technical field of motors, and discloses anti-electromagnetic interference magnetic suspension controller equipment and a filtering method. The method comprises the following steps: preparing a quantum confinement magnetic permeability unit, acquiring magnetic flux and temperature data in a magnetic core in real time through an embedded sensor array, and building a corresponding magnetic permeability regulation and control model; the output of the magnetic conductivity regulation and control model is obtained, and real-time inductance is obtained through analysis; on the basis of the real-time inductance, in combination with a preset target inductance, compensating the real-time inductance through a grid voltage regulation and inductance compensation cooperation strategy; according to the compensated real-time inductance, a PID controller is adopted for filtering; under the strong magnetic field and high temperature coupling environment, the nonlinear decrease amplitude of the magnetic conductivity can be effectively reduced, the drift amount of the inductance value, the cut-off frequency offset of the filter and the current ripple can be reduced, the rotor suspension precision can be improved, and the filtering stability and the control reliability of a magnetic suspension system under the extreme environment can be remarkably improved.

The present invention discloses a displacement measurement device and a displacement measurement method for an eddy current sensor. The displacement measurement device includes: an eddy current sensor, a preamplifier, which is provided with a variable resistor and a resonant capacitor connected in series in sequence, and the resonant capacitor is adapted to be connected in parallel with the probe inductor; a voltage acquisition module, which is arranged in the preamplifier; a controller, which is provided with a control end and a first acquisition end, the control end is connected to the variable resistor, and the first acquisition end is connected to the voltage acquisition module; when the peak-to-peak voltage of the resonant voltage is not within a preset range, the controller adjusts the resistance value of the variable resistor to make the peak-to-peak voltage of the resonant voltage within the preset range. This ensures the consistency of the output signal of the eddy current sensor, ensures the accuracy of the position detection of the magnetic levitation system, thereby improves the stability of the magnetic levitation bearing control system, and reduces the output difference caused by the matching of the sensor probe with different preamplifiers.

The invention provides a finite time position tracking control method of a magnetic suspension system with output constraint, which comprises the following steps of: establishing a mathematical model of the magnetic suspension system, determining an error system, and obtaining upper and lower bounds of suspension air gap constraint and system state information; designing a fractional obstacle Lyapunov function by considering upper and lower bounds of suspension air gap constraint, and solving partial derivative to obtain a constraint processing mechanism function; designing a continuous finite time state feedback constraint controller by using system state information based on a constraint processing mechanism function by applying a finite time control technology and a homogeneous system theory; and based on the constraint processing mechanism function, when the system speed state information cannot be measured, designing a non-smooth filter, and designing a finite time output feedback controller by using the filter output information and the system output information. Unified finite time control of the magnetic suspension system under symmetric / asymmetric suspension gap constraint is realized, and the method has high tracking precision, strong anti-interference robustness and engineering practicability.

The present invention provides a capsule robot magnetic levitation system and method based on magnetic sensing and visual feedback, as well as a readable storage medium. The system includes a magnetic levitation platform, an orthogonal guide rail module, a control processor, and a capsule robot. The magnetic levitation platform is mounted on the orthogonal guide rail module, and the control processor is connected to the magnetic levitation platform and the orthogonal guide rail module, respectively. The control processor can drive the magnetic levitation platform to generate a control electromagnetic field, and the control processor can drive the orthogonal guide rail module to move. The present invention has the following beneficial effects: it can further realize the active motion control and sensor positioning functions of the capsule robot; expand the capsule robot's range of motion; is expected to improve the impact of external interference on the capsule robot's positioning problems; and achieve stable suspension and active control of the capsule robot.

This invention discloses a method, self-sensing system, and medium for predicting rotor displacement of a magnetic levitation bearing, belonging to the interdisciplinary field of artificial intelligence and magnetic levitation systems. The method includes: a training phase: collecting waveform data of the winding current and actual rotor displacement of the magnetic levitation bearing under different operating conditions; using the winding current values ​​and operating condition categories at times (t-1), (t-2), ..., (t-n) as input and the rotor displacement value at time t as output, training a rotor displacement prediction model; where n is an integer greater than or equal to 2; and an application phase: acquiring the winding current values ​​and operating condition categories from the previous n times in real time, inputting them into the trained rotor displacement prediction model, and predicting the rotor displacement value at the current time. This invention can predict rotor displacement through real-time winding current information of the magnetic bearing, thereby enabling fault response to displacement sensors in magnetic levitation systems, reducing dependence on displacement sensor hardware, and even replacing displacement sensors, thus reducing costs.

The utility model discloses an embodiment relates to a kind of based on 6D magnetic levitation system's laser etching machine, and the utility model is driven by magnetic levitation transmission mechanism to carry out displacement mobile, and it is combined first laser etching area, second laser etching area, turnover area and detection area, and corresponding laser etching mechanism, turnover mechanism and detection mechanism, realize the high-precision transmission of electric core, double-sided laser etching and real-time detection, to solve the problem of low transmission accuracy, big mechanical impact and insufficient flexibility in the prior art, improve electric core transmission accuracy and stability, reduce mechanical impact, enhance production line flexibility.

This application provides a displacement sensor and a magnetic levitation system. The magnetic levitation system includes a magnetic levitation bearing and a displacement sensor. The displacement sensor includes: a first magnetic source mounted on the rotor shaft of the magnetic levitation bearing, used to generate a magnetic field; a substrate fixedly disposed at a distance from the first magnetic source, with a central hole for the rotor shaft to pass through; and a Hall array including multiple Hall chips, each attached to and electrically connected to the substrate. The Hall chips are distributed around the central hole, and each Hall chip can detect the magnetic flux density at its respective location to obtain position information of the first magnetic source and the rotor shaft. Compared to traditional magnetic levitation bearings, this application uses fewer displacement sensors, thus reducing the installation space occupied by the displacement sensors. It is also suitable for applications where the rotor shaft is extended.

The invention provides a non-contact power supply-based magnetic suspension rotor wireless energy transmission method and system, and relates to the technical field of non-contact power supply, and the method comprises the steps: carrying out the motion state vector reconstruction of a magnetic suspension rotor, and outputting a pose priority weight vector; setting a data acquisition scheduling strategy; receiving a six-degree-of-freedom native state set; after load impedance transient response data are received, the real-time pose of the rotor is reconstructed and output; fitting the instantaneous optimal frequency and the current waveform phase compensation amount of the resonant cavity; loading to an adaptive power mapping model, and predicting a power demand change trend; and dynamically tuning output parameters of the high-frequency inverter, and performing coupling efficiency offset compensation. The technical problem that the performance of a whole magnetic suspension system is affected due to the fact that a wireless energy transmission method in the prior art depends on static frequency and current waveform setting and is difficult to adapt to the rapidly changing motion state and load requirement of a magnetic suspension rotor in real time is solved.

The present invention belongs to the field of magnetic levitation, and specifically relates to a suspension gap adjustment protection device, a magnetic levitation system and a method. The suspension gap adjustment protection device includes a mounting base and rolling elements. A rolling groove and a wheel axle mating groove are provided on the mounting base. The bottom of the rolling groove is inclined, and the wheel axle mating groove is provided with an entrance facing the lower side of the bottom of the rolling groove. The rolling elements include a wheel axle and a wheel body. The rolling elements have a moving stroke from the lower side to the upper side of the bottom of the rolling groove to roll away from the bottom of the groove. When the rolling elements roll away from the bottom of the groove, the wheel axle is rotationally mated with the wheel axle mating groove through the entrance. The present invention is used to limit the minimum suspension gap between the F-rail and the magnetic levitation module, thereby preventing the F-rail and the magnetic levitation module from attracting each other. At the same time, the suspension gap can be quickly adjusted from the minimum value to the normal value and the normal suspension gap can be maintained until the suspension control system resumes normal working state.

The invention discloses a short primary linear driving electromagnetic suspension system which comprises a suspension frame and a track beam which are oppositely arranged, and a cavity is defined by the suspension frame and the track beam so as to install a magnetic conductive track, a linear motor primary, a linear motor secondary and an electromagnet. The electromagnets are positioned on two sides of the linear motor primary and are positioned on the vehicle body side; the magnetic conductive track and the linear motor secondary are located on the track side together, laid below the track beam and located above the linear motor primary and the electromagnet. In the short primary linear driving electromagnetic suspension system, the primary winding of the linear motor does not need to provide exciting current and is excited by the permanent magnet, the secondary winding does not have eddy current loss of an induction plate, and the motor efficiency is high. The linear motor can generate suspension force, the linear motor and the electromagnet jointly bear the suspension function of the maglev train, the electromagnet only needs to bear part of suspension load, temperature rise is low, and the suspension capacity of the system is high. The system does not need a water cooling device, and is simple in structure, light in weight and low in cost.

A magnetic levitation system for a transport vehicle is described. The magnetic levitation system includes a plurality of active magnetic bearings extending along a transport track and at least a first power stage and a second power stage, wherein a first group of the plurality of active magnetic bearings is connected to the first power stage, and a second group of the plurality of active magnetic bearings is connected to the second power stage.

The invention discloses a high-precision position detection method for a protection bearing of a magnetic suspension system. The method comprises the following steps: connecting an inductance test system containing an excitation source with a magnetic bearing coil through a four-wire method; establishing a communication link between the inductance test system and an upper computer data processing system; applying a low-frequency alternating current signal to the magnetic bearing coil; adjusting the position of the rotor to enable the rotor to be in a limit position for protecting a bearing; measuring the inductance value of the magnetic bearing coil at the limit position; substituting the actually measured inductance value into the position deviation detection model to calculate the deviation value of the mounting position of the protective bearing; the deviation value obtained through calculation is compared with an allowable deviation range, and if the deviation value exceeds the range, an alarm signal is sent out; and if the deviation value is within the range, determining that the mounting position is normal. According to the invention, the high-precision and high-reliability detection of the installation position of the protection bearing is realized, an external closed-loop control system is not needed, and the detection of the installation position of the protection bearing of a magnetic suspension system on a production line can be realized.

This application relates to a method, apparatus, computer equipment, and medium for judging the performance degradation of magnetic levitation systems. The method includes: firstly, using the Symmetric Polar Coordinate (SDP) method, converting one-dimensional time-series data (3 sets of suspension gaps, 2 sets of vertical accelerations, and 1 set of electromagnet currents) into two-dimensional images, achieving interpretable fusion of multi-source parameters, reducing the false positive rate of single-data noise, and improving feature representation. Then, using a pre-trained Swin Transformer to extract multi-scale features from the images, mapping them, and then using a dual encoder to mine discriminative concept embeddings. Features are fused using a concept weight matrix, and a model is trained by combining fine-grained classification loss and dual-objective constraint loss. Real-time running data is converted into images using the same method, and the trained model is used for discrimination, solving the problems of limited receptive field and insensitivity to weak features in traditional models, significantly improving the accuracy of degradation recognition.

In various embodiments, a method for determining a position of an element of a mechanical system relative to a levitated platform of a magnetic levitation system and / or a workpiece located thereon. The method comprising the following position referencing steps: monitoring at least one parameter of the magnetic levitation system indicative of the position of the levitated platform with respect to the magnetic levitation system, inducing relative movement between the levitated platform and the element of the mechanical system, stopping the relative movement between the levitated platform and the mechanical system when physical contact is established, and determining the position of the element of the mechanical system relative to the levitated platform. The method described herein can be used in additive manufacturing and assembly processes to correct for any misalignment between two independently operating systems.

The present invention discloses a control device, a method and a magnetic levitation system for a power amplifier. The device includes: a control unit, which determines the PWM signal of the power amplifier and outputs the PWM signal; the number of the PWM signals is more than one; a chip selection unit, which multiplexes at least one of the PWM signals among more than one PWM signals to obtain at least two PWM multiplexed signals of the at least one PWM signal, so as to use one PWM multiplexed signal to drive and control a corresponding switching tube of the upper tube or the lower tube through a driving circuit of the corresponding switching tube of the upper tube or the lower tube. By multiplexing the signals of the PWM wave of the MCU, this solution can increase the resources of the PWM wave of the MCU.

This invention discloses a permanent magnet electromagnetic levitation steam turbine generator, relating to the field of generator sets. It includes a base plate, a generator set base, a stator block, stator coils, magnetic pole windings, and end shafts. The generator set base is fixedly mounted on the upper end of the base plate. The permanent magnet electromagnetic levitation steam turbine generator of this invention allows the rotor to be in a levitation state, completely avoiding the mechanical friction of traditional rotor bearing pressure structures. Once a displacement sensor detects a deviation, the position of the magnetic levitation structure can be finely adjusted by adjusting the screw or changing the current in the conductive coil, achieving overall dynamic adjustment of the magnetic levitation structure. This ensures that the rotor eccentricity meets power generation requirements. The threaded fit between the adjusting screw and the screw seat allows for independent adjustment of the local position of the support ring. The rotor magnetic partition and the levitation magnetic partition isolate the generator's magnetic field from the detection mechanism, preventing mutual interference. The cooperation between the anti-detachment rod and the anti-detachment sleeve provides temporary mechanical support in case of unexpected failure of the magnetic levitation system.

The present application relates to a power supply monitoring system and method for a magnetic levitation internal thread copper tube processing device. The system includes a processing spindle, a magnetic levitation system, and a control device; it also includes a power supply module, a power supply monitoring module, an opening adjustment device, and an adjustable tool head; the adjustable tool head is provided at the input end of the processing spindle; the input end of the power supply module is connected to an external input power supply, and the output end is electrically connected to the magnetic levitation system and the control device respectively; the power supply monitoring module is connected between the power supply module and the control device; the adjustment end of the opening adjustment device is mechanically connected to the adjustable tool head, and the control end is electrically connected to the control device; it can realize the opening expansion and contraction adjustment of the adjustable tool head when a power supply failure is detected. The present application can monitor the power supply in real time, and when a power supply failure is detected, adjust the opening of the adjustable tool head to avoid uneven internal threads of the copper tube and improve the stability of the internal thread processing of the copper tube.

The present application discloses a method and device for generating a coil model, which includes constructing a first coil; cutting the first coil perpendicular to the direction of current to obtain a first section and a second section of the first coil; setting the first section and the second section to be connected to a power supply, and setting the resistance of the first coil to be greater than the resistance of other components connected in series in the circuit to obtain a coil model; the coil model is used to infer the electromagnetic force of a magnetic levitation system. By cutting the first coil to obtain a first section and a second section, and connecting the first section and the second section to a power supply, the connection state of the superconducting coil in the magnetic levitation system is simulated. The electromagnetic force of the magnetic levitation system inferred by the coil model provided in the embodiment of the present application has good accuracy, and the coil structure is relatively simple, and the calculation speed is relatively fast.

The present invention provides a magnetic levitation radial bearing stator, a radial bearing, a compressor, and an air conditioner, wherein the magnetic levitation radial bearing stator includes a stator core, the stator core has a plurality of stator teeth extending toward its axis, the stator teeth are wound with coils, the tooth shoe surfaces of the stator teeth are configured with stator comb teeth, a stator slot is formed between two adjacent stator teeth, and a filler is provided in the gap between the stator slot and the coil therein, so that the axial ends of the stator core are not connected. According to the present invention, there is no need to adopt the method of installing a sealing disk on the rotating shaft in the prior art alone, thereby reducing the space occupied by the axial length of the rotating shaft, which is conducive to reducing the length of the rotating shaft, and further reducing the fixed frequency of the rotor, expanding the operating range of the compressor magnetic levitation system and improving the operating reliability.

The present application discloses a method and apparatus for generating a coil model. The method includes: constructing a second coil and a third coil; cutting the second coil perpendicular to the direction of current flow to obtain a third section and a fourth section of the second coil; cutting the third coil perpendicular to the direction of current flow to obtain a fifth section and a sixth section of the third coil; connecting the third section and the fifth section; and connecting the fourth section and the sixth section to obtain a coil model. The coil model is used to infer the electromagnetic force of a magnetic levitation system. By connecting the sections of the second coil and the third coil, respectively, the complex "8" coil structure in an actual magnetic levitation system is simulated using two basic circular coils. This results in a more accurate and faster calculation of the electromagnetic force of the magnetic levitation system derived from the coil model.

This invention discloses a motor, a control method for the motor, and a flywheel energy storage device. The motor includes a rotor and a vibration damping assembly. The vibration damping assembly includes a magnetic levitation assembly and a vibration damping element. The magnetic levitation assembly is sleeved on the outside of the rotor, and the vibration damping element is sleeved on the outside of the magnetic levitation assembly. In the radial direction, the vibration damping element and the magnetic levitation assembly are spaced apart. When the radial amplitude of the rotor exceeds a preset value, the magnetic levitation assembly moves towards the vibration damping element, and the magnetic levitation assembly is coupled to the vibration damping element. This reduces the load on the magnetic levitation system while ensuring normal motor operation, converting additional vibration into heat through the vibration damping element for release, thus extending the service life of the magnetic levitation assembly.

The application discloses a maglev long-stator cable winding pressing embedding method and device, a laying method and equipment, relates to the technical field of maglev rail transit, and the maglev long-stator cable winding pressing embedding method comprises the following steps: receiving and positioning a cable winding unit, obtaining position information of a stator core, adjusting the pressing embedding position of the cable winding unit according to the position information and positioning information of the cable winding unit, and pressing embedding the cable winding unit in a groove of the stator core. The maglev long-stator cable winding pressing embedding method is simple and convenient to operate, has strong applicability, can effectively solve the problems of complex structure, poor positioning accuracy, difficult pressing embedding operation, slow operation speed and low efficiency in the existing pressing embedding device, and can reduce the risk of transmission damage, improve the pressing embedding accuracy, improve the operation efficiency and reduce the investment cost.

The invention discloses a maglev adjustable track assembly and a construction method thereof, and relates to the technical field of maglev systems.The maglev adjustable track assembly comprises a beam body, a track connecting pre-buried assembly, a track mounting assembly and a U-shaped track section, the first connecting end of the track mounting assembly is detachably arranged on a cantilever end through a first fastener, and the mounting position of the track mounting assembly is adjustable in the elevation direction; the U-shaped rail section is detachably hung at the second end of the rail installation assembly through a second fastener, and the installation position is adjustable in the transverse direction. According to the magnetic levitation adjustable track assembly, when the beam body is prepared, the track connecting pre-embedded assembly is pre-embedded, the U-shaped track sections and the track mounting assemblies are pre-positioned and assembled through the second fasteners to form the pre-assembled track panel, the pre-assembled track panel can be adjusted up and down relative to the beam body, and the U-shaped track sections can be adjusted left and right relative to the beam body; compared with a beam-rail integrated structure, the dependence on the manufacturing precision of the beam body is reduced through rail installation, the manufacturing precision of the beam body and the rail is greatly reduced, and the construction cost is reduced.

The invention provides a UAV-InSAR-based magnetic levitation system multi-point cooperative reinforcement learning compensation control method, system and device and a medium, and the method comprises the steps: carrying out the high-precision surveying and mapping of a magnetic levitation line through employing an unmanned plane to carry a lightweight X-waveband interferometric synthetic aperture radar system, and constructing a track irregularity power spectrum model; a hierarchical control system is constructed, and an amplitude saturation controller on the lower layer generates a basic electromagnetic force control law according to the state quantity of the current suspension point; the upper-layer compensator based on reinforcement learning serves as an intelligent agent, interacts with an environment jointly formed by the suspension frame, the track and the amplitude saturation controller, carries out training by utilizing a standardized irregularity function obtained from a track irregularity power spectrum model, and outputs compensation control quantity for each suspension point; and superposing the basic electromagnetic force control law and the compensation control quantity to generate a total electromagnetic force control law of each suspension point, and carrying out active cooperative compensation and global stable suspension control on the suspension system. The comprehensive control performance of the suspension system is remarkably improved.

The application discloses an abnormality detection method and device of a magnetic suspension bearing system, the magnetic suspension bearing system and a storage medium, and relates to the technical field of magnetic suspension bearing systems. The method comprises the following steps: during the operation of the magnetic suspension bearing system, determining whether the suspension current of the magnetic suspension bearing system is abnormal according to the current suspension current and a pre-determined standard suspension current; if the abnormality is confirmed, changing the suspension position of the rotor to the center position of the preset magnetic bearing according to the pre-determined standard suspension current, and determining the fault point of the abnormal suspension current according to the current suspension current and the pre-determined standard suspension current. According to the scheme, whether the current suspension current is abnormal is determined by comparing the current suspension current with the standard suspension current, the suspension position of the rotor is adjusted if the abnormality is confirmed, and the abnormality reason is determined according to the current suspension current and the standard suspension current, so that whether the suspension current is abnormal and the abnormality reason can be found in time, and the efficiency of abnormality detection is improved.

A substrate support device is provided. The substrate support device includes a base secured to a processing chamber. The base includes a stator configured to generate a first magnetic field, a second magnetic field, and a third magnetic field. The substrate support device further includes a substrate support above the base for supporting a substrate. The substrate support includes a rotor with a first reactive region that interacts with the first magnetic field to control a vertical position of the substrate support, and interacts with the second magnetic field to center the substrate support to the base. The substrate support includes a second reactive region that interacts with the third magnetic field to rotate the substrate support. The first magnetic field and the first reactive region selectively levitate the substrate support to any distance within a range from 0 mm to 6 mm above a resting position.

The invention discloses a control method and device of a frequency converter, a magnetic suspension system, a storage medium and a computer program product, the frequency converter is used for supplying power to a motor and a bearing in the magnetic suspension system, the frequency converter is provided with an inverter, and the method comprises the following steps: under the condition that the frequency converter enters an energy feedback stage, obtaining a bus voltage of the frequency converter, obtaining the output current of the inverter, and obtaining the output voltage of the inverter; according to the bus voltage of the frequency converter, the output current of the inverter and the output voltage of the inverter, determining a zero crossing point of the inverter and a dead zone compensation voltage of the inverter; and at the zero crossing point of the inverter, performing dead-zone compensation on the inverter by using the dead-zone compensation voltage of the inverter so as to realize dynamic dead-zone compensation control of the frequency converter at the energy feedback stage. According to the scheme, compensation control is carried out on the dead time of the switching tube in the inverter in the energy feedback stage of the frequency converter, so that the loss of the switching tube is reduced, and the energy feedback efficiency is improved.