219 results about "Induction motor" patented technology

The invention discloses an electronic switch assembly and a control method of a split-phase starting single-phase induction motor for a household clothes dryer. The assembly comprises an MCU, the MCU is loaded with a real-time algorithm software control program, and the starting speed state of the motor can be detected by analyzing and processing the change of steady-state positive sequence amplitude current in the starting process. Based on real-time positive sequence amplitude current analysis processing, the MCU calculates and detects an overspeed condition in real time, disconnects an auxiliary winding and connects a heater element so as to accurately control the transition of the motor to single-phase operation until a rated rotating speed is reached. Based on real-time positive sequence amplitude voltage and current analysis and processing, the overload condition of rated rotor speed reduction can be detected, and the auxiliary winding can be switched on again to maintain the operation performance of the motor. The assembly includes a housing having a heat sink for efficient thermal management and overheating protection of electronic devices. And an effective, reliable and low-cost solution is provided for the operation of the efficient clothes dryer by ensuring the accurate control on the starting and operating conditions of the motor and the overload protection.

A system for providing inrush current limiting for induction motor starting. The system utilizes a pre-start controller to initialize operation of a controller including multiple switches for controlling the voltage delivered to a motor having multiple phases. The pre-start controller activates each switch and determines whether a phase current flowing through the switches satisfies a threshold current. The switches are deactivated a phase current satisfies the threshold current. The pre-start controller determines an activation order for each phase and orders phases having higher phase currents higher in the order than lower phase currents, and determines an activation timing. Based on whether the highest phase current is positive or negative, the pre-start controller then activates, using a voltage at a corresponding angle and based on the activation order and activation timing, the phases to de-saturate the flux generated by the phase currents, thereby limiting an inrush current provided to the motor.

The invention discloses a variable frequency motor load testing device and method, and relates to the technical field of variable frequency motor testing, and the device comprises a motor testing installation platform, a fastening T-shaped bolt, two variable frequency speed regulation asynchronous motors of the same model, a drum-shaped coupler, two inverters, a rectifier, a three-phase voltage regulator, a frequency converter and an intermediate DC link. According to the invention, two frequency conversion speed regulation asynchronous motors of the same model are coaxially connected, and the power generation electric energy of the accompanying test motor is fed back to an intermediate direct current link through an inverter, so that the cyclic utilization of the electric energy and the dual-motor structural design are realized, complex load equipment does not need to be configured, and the fixed asset investment is reduced; for motors of different models, only corresponding accompanying test motors need to be replaced, the universality is improved, through voltage and current monitoring in an intermediate direct current link and motor rotating speed and torque parameter collection, and by combining a multi-dimensional performance evaluation model, precise evaluation of the motor load performance is achieved, the test efficiency is improved, and the strict test requirements are met.

The invention relates to a doubly-fed variable-speed pumped storage unit fractional order PID additional frequency control method and system, and the method comprises the steps: building an electrical mathematical model of a doubly-fed induction motor based on a synchronous rotating coordinate system, enabling a stator flux linkage to be aligned with the d-axis direction through employing a stator flux linkage directional control strategy, and enabling the stator flux linkage to be aligned with the d-axis direction; therefore, decoupling adjustment of active power and reactive power output by the unit is realized. The frequency deviation between the power grid common connection point frequency and the rated frequency is obtained and serves as an input signal of the fractional order PID additional controller, the frequency deviation can be effectively restrained under various working conditions, the system stability and the inertia supporting capacity are enhanced, and the method is suitable for auxiliary frequency control of a variable speed pumped storage unit in a high-proportion new energy power grid.

The utility model relates to a dual-drive high-efficiency high-reliability electric centrifugal pump set, which adopts a dual-drive motor to drive a centrifugal pump, the dual-drive motor consists of an asynchronous motor and a permanent magnet motor which are arranged in the same base, and a frequency converter is connected with the permanent magnet motor and is connected with the asynchronous motor through an electric cabinet. The frequency converter is used for supplying power to the permanent-magnet motor, the electric cabinet is used for supplying power to the asynchronous motor, and the permanent-magnet motor or the asynchronous motor drives the centrifugal pump to operate through the rotating shaft. During normal operation, the asynchronous motor is not electrified, and the permanent magnet motor is controlled by the frequency converter to start, regulate the speed and stop, so that the efficiency of the pump set during operation under a bias working condition can be improved, and vibration noise is reduced. When the frequency converter or the permanent magnet motor breaks down, the frequency converter sends a fault signal to the electric control box, the electric control box cuts off an output power supply of the frequency converter, and directly outputs a power frequency power supply to the asynchronous motor, so that continuous operation of the pump set is ensured, the task reliability of the pump set is improved, and damage to a system or emergency shutdown of the system caused by shutdown of the pump set is avoided.

The invention discloses an AC induction motor prediction control method based on gradient descent, and the method comprises the following steps: building a mathematical model of an AC induction motor, employing a sliding model reference adaptive MRAS observer, employing a gradient descent iteration method, employing the gradient descent iteration method as an adaptive law, and carrying out the iteration in the reverse direction of the gradient of a quantization error, the method comprises the following steps: searching a minimum value of a quantization error, performing model prediction torque control, obtaining a switching state of an upper bridge arm switching tube of each phase in an inverter in a driving system of the alternating current induction motor, selecting a switching state which minimizes a cost function, and outputting the switching state to the inverter, so as to accurately and quickly minimize the error, and improve the reliability of the inverter. And current tracking performance similar to carrier waves is realized.

The utility model relates to the technical field of oil pumping units, in particular to a permanent magnet axial magnetic flux driving device for an oil pumping unit, which comprises a base and a beam-pumping unit, and the beam-pumping unit is mounted on the upper side of the left of the base. The beam-pumping unit is reasonable and compact in structure, when the beam-pumping unit is used, the permanent magnet axial magnetic flux driving device is electrically connected with the frequency converter, the frequency converter drives the driving shaft of the permanent magnet axial magnetic flux driving device to rotate, the speed reducer connected with the driving shaft is used for speed reduction, and the output shaft of the speed reducer drives the beam-pumping unit to work to achieve the purpose of oil extraction. Compared with a traditional driving mode of a beam-pumping unit, the permanent magnet axial magnetic flux driving device can improve efficiency, reduce starting current, omit a transmission mechanism of a belt and a belt pulley, improve transmission efficiency, reduce maintenance cost and avoid potential safety hazards under the condition of the same specification and size. And the overload torque of the driving shaft can be improved, and more complex working conditions can be coped with.

A system includes an induction motor configured to drive an electric submersible pump (ESP). The induction motor includes a one or more rotors disposed about a rotational axis, and a plurality of bearings disposed about the rotational axis. Each bearing of the plurality of bearings is disposed axially between a pair of rotors of the one or more rotors. The induction motor further includes one or more stators disposed about the one or more rotors.

The invention discloses an AC excitation system no-load voltage buildup and pre-synchronization grid-connected control method and system, and the method comprises the steps: obtaining the amplitude and phase of a power grid voltage in real time through a phase-locked loop when the rotating speed of a doubly-fed induction motor reaches a synchronous rotating speed range; detecting the mechanical position of the rotor by using an encoder and calculating a slip angle; carrying out fundamental component extraction and phase correction on the stator side no-load voltage; setting a stator voltage target value based on power grid voltage directional control and calculating target rotor current; constructing a rotor current inner loop control loop, calculating a feedforward decoupling item and performing phase compensation; superposing a stator voltage outer loop control loop, and correcting the rotor current through closed-loop adjustment to eliminate the deviation between the stator side no-load voltage and the power grid voltage; and when a preset synchronization condition is satisfied, closing the grid-connected circuit breaker and switching a control mode. Accurate no-load voltage buildup and smooth pre-synchronization grid connection of the excitation system are achieved through a double closed-loop control structure, and the stability and reliability of the grid connection process are improved.

The utility model belongs to the technical field of water pump application, and particularly discloses a high-flow self-adaptive sewage pump. Comprising a fan blade cover, a motor rear end cover, a machine barrel, a motor front end cover, a pump head, fan blades, a shaft clamp spring, a stator assembly, a first rolling bearing, a rotor assembly, a volute, an impeller, a water retaining ring, a water outlet, a water inlet, a waterproof switch assembly, a switch sealing gasket, a capacitor, a capacitor box lower cover and the like which are assembled in a matched mode. The utility model has the beneficial effects that: before the water pump works, the vortex cavity needs to be filled with water; when the impeller rotates at a high speed, liquid between the blades rotates along with the blades, so that the liquid obtains higher pressure energy, and the lift is improved; the volute and the impeller are respectively made of integrally-formed gray cast iron and have good abrasion resistance, the service life of the volute and the service life of the impeller can be prolonged, and it is guaranteed that the water pump has the long service life under the high load. The working efficiency of the whole machine is improved by using a high-efficiency induction type motor; the hook structure facilitates storage of a power line, and the use convenience of the water pump is improved.

The invention discloses a doubly-fed induction motor parameter identification method based on adaptive extended Kalman filtering, and aims to solve the problems of low doubly-fed induction motor parameter identification precision and integrity, sensitive noise and the like in the prior art. According to a dq-axis flux linkage equation and a voltage equation of the doubly-fed induction motor, a state space model with dq-axis current of a stator and a rotor as state variables is built, the dimension of the state space model is expanded, the full-parameter observability of resistance Rs and Rr and inductance Ls, Lr and Lm of the motor is judged by utilizing a self-adaptive extended Kalman filtering theory and combining a rank criterion, and the accuracy and accuracy of the state space model are improved. All-parameter identification of inductance and resistance of the motor is realized, and the robustness of the system is improved through a method of adaptively adjusting noise covariance. The parameter coupling influence can be effectively eliminated, and the identification precision is improved; the self-adaptive noise suppression mechanism enhances the anti-interference capability, and meets the dynamic on-line parameter identification requirements of the doubly-fed motor.

The invention relates to a double-fed asynchronous motor debugging method and system based on a back-to-back converter, and belongs to the technical field of motor control. Comprising the following steps: supplying power to a three-phase alternating-current voltage regulator, and charging a direct-current bus capacitor by connecting a grid-side alternating-current contactor with a buffer resistor in parallel; when the DC bus capacitor is charged to a preset amplitude, the digital signal processor sends a closing signal to the AC contactor; after the alternating current contactor is switched on, pure open-loop debugging, current closed-loop debugging and rotating speed closed-loop debugging are respectively carried out on the rotor side; the upper computer controls the pulse width modulator to work, carries out excitation on the rotor, and monitors the voltage and phase of the stator end; when the voltage rises to a preset value and the phase is synchronized with the power grid, a closing signal is sent to the AC contactor at the stator side, and the motor stator is connected to the power grid. The problems that a traditional doubly-fed asynchronous motor is too large in starting current and complex in control link decoupling are solved, and the debugging reliability and efficiency are improved. In addition, debugging does not depend on additional prime mover dragging.

The utility model belongs to the technical field of engineering construction, and particularly relates to a multifunctional angle measuring instrument which comprises a bottom table, a rotary moving mechanism is arranged above the bottom table, and a measurement executing mechanism is arranged above the rotary moving mechanism. Through the arranged measurement executing mechanism, the measuring instrument is effectively moved, an induction motor is started to drive a lead screw to rotate, a lifting table is driven to ascend and descend, a pushing assembly is started to drive a distance measuring instrument to longitudinally move in a groove, the distance needing to be measured is measured, and a telescopic rod is moved to move; the moving distance is displayed through the fan-shaped graduated scale, and the lifting platform lifts and moves to drive the horizontal ruler, the height ruler and the angle measuring ruler to lift and move, so that the effective moving effect of the measuring instrument is ensured, more accurate measurement is facilitated, the measuring efficiency is improved, the measuring instrument can simultaneously measure the angle, the length and the perpendicularity, the operation is simple, and the cost is low. The practicability is high.

The invention provides an induction motor monitoring and early warning system and a related method. The induction motor monitoring and early warning system comprises a motor monitoring terminal, a motor comprehensive analysis platform and a motor, the motor obtains a first working mode of the motor and a first working parameter of the motor in a preset time period; the motor monitoring terminal determines a first working stability evaluation value of the motor according to the first working parameter; the larger the first working stability evaluation value is, the more stable the motor works; when the first working stability evaluation value is smaller than or equal to a first threshold value, determining a first anomaly detection model according to the first working mode and the first working stability evaluation value; determining a first anomaly detection result according to the first working parameter and a first anomaly detection model; and the motor comprehensive analysis platform determines a first early warning parameter according to the first anomaly detection result, and performs early warning operation according to the first early warning parameter. According to the scheme, abnormal conditions of the motor can be monitored in real time and early warning can be timely performed.

The invention relates to a method for diagnosing the state of an asynchronous motor (M) to which three-phase voltages UR, S, T (t) having a supply frequency (fU) are applied, comprising the following steps: a) detecting a voltage time sequence (Ut) of the voltages UR, S, T (t) and a current time sequence (It) of three-phase motor currents IR, S, T (t) flowing through the asynchronous motor (M) as a result of the voltages UR, S, T (t) applied to the asynchronous motor (M); b) calculating a current spectrum I (f, t) and a voltage spectrum U (f, t) on the basis of the detected time series (It, Ut) by means of FFT; c) calculating one or more of the following time-dependent spectral variables 1-6: 1) the current components Ia (f, t), Ib (f, t), where Ia (f, t) and Ib (f, t) are formed from IR, S, T by Park transformation; 2) total current amplitude AI (f, t) = square root of (Ia (f, t)) 2 + (Ib (f, t)) 2); 3) the phase angle phi ab (f, t) between the current components is equal to arctan (Ia / Ib); 4) the phase angle phi UI (f, t) between the current and voltage components = arctan (U (f, t) / I (f, t)); 5) instantaneous spectrum power P (f, t) = U (f, t) * I (f, t); 6) admittance X (f, t) = I (f, t) / U (f, t), d) is a spectral variable calculated for anomaly analysis; and e) reporting the exception when the exception is confirmed.

The utility model relates to the field of junction boxes, in particular to an ultra-high-efficiency three-phase asynchronous motor junction box which comprises a box body, a box cover is arranged at the upper end of the box body, a fixing part is arranged between the box body and the box cover, a plurality of annular separation grooves are formed in the outer side of the box body, and the separation grooves are communicated with the box cover. Through the arrangement of the separating groove, the check block, the fixing ring, the connecting ring, the sleeve and other components, in the working process, a worker can conveniently take out a designated part on the box body and separate the designated part from a main body through the separating groove, so that the trouble of drilling through a professional tool is avoided, the working efficiency is improved, and the working efficiency is improved. According to the device, the separation groove area can be reinforced through mutual cooperation of the stop block component and the fixing ring component, accidental falling is avoided, the effect of protecting the wire harness is achieved through mutual cooperation of the connecting ring component and the sleeve component, and therefore the device can be conveniently used by workers.

Provided is a control device and program capable of easily outputting the state of mechanical loss in an induction motor. A control device that controls an industrial machine having an induction motor includes: a power cutoff section that cuts off power supply to the induction motor; a speed acquisition section that acquires the rotational speed of the induction motor; an acceleration calculation section that calculates acceleration based on the acquired rotational speed; a moment of inertia acquisition section that acquires the moment of inertia of the main shaft of the induction motor; a mechanical loss calculation section that calculates the mechanical loss of the induction motor based on the acquired rotational speed, the calculated acceleration, and the acquired moment of inertia; and an output section that outputs the calculated mechanical loss.

This invention discloses a method and system for no-load voltage build-up and pre-synchronization grid connection control of an AC excitation system. The method includes: acquiring the amplitude and phase of the grid voltage in real time via a phase-locked loop when the speed of the doubly-fed induction motor reaches the synchronous speed range; detecting the rotor mechanical position and calculating the slip angle using an encoder; extracting the fundamental component and correcting the phase of the stator-side no-load voltage; setting a target value for the stator voltage based on grid voltage-oriented control and calculating the target rotor current; constructing an inner-loop control loop for the rotor current, calculating the feedforward decoupling term and performing phase compensation; superimposing an outer-loop control loop for the stator voltage, and correcting the rotor current through closed-loop adjustment to eliminate the deviation between the stator-side no-load voltage and the grid voltage; and closing the grid connection circuit breaker and switching the control mode when the preset synchronization conditions are met. The dual-closed-loop control structure achieves precise no-load voltage build-up and smooth pre-synchronization grid connection of the excitation system, improving the stability and reliability of the grid connection process.

The present invention discloses a stator core calibration device for a conical rotor three-phase asynchronous motor and its usage method, which relates to the technical field of stator core production. It includes a working platform, on the top of which a vibration motor is fixedly installed. Above the vibration motor, there is a U-shaped housing. The bottom end of the U-shaped housing is connected to the top end of the working platform through four shock-absorbing springs. A vibration motor is installed at the bottom end of the U-shaped housing, and the execution end of the vibration motor is drivingly connected to a positioning rod. A through hole for the positioning rod to pass through is provided at the bottom end of the U-shaped housing, and the inner diameter of the through hole > the outer diameter of the positioning rod. A calibration rotor sleeved on the positioning rod is arranged inside the U-shaped housing, and the outer wall of the calibration rotor matches the inner wall of the stator core. A movable notch calibration mechanism is installed at the top end of the U-shaped housing, and the execution end of the notch calibration mechanism is used to insert into the notch of the stator iron core sheet, and cooperate with the vibration of the vibration motor to calibrate the notches of multiple stator iron core sheets.

The present invention relates to a hairpin wound around a stator and, more specifically, to a hairpin with improved ease of manufacture and assembly. In the hairpin and a method for manufacturing and assembling the hairpin according to the present invention, the hairpin includes at least two bending parts, and thus, when applied to an induction motor having a low number of poles, prevents the end height of a coil assembly comprising the hairpin from becoming excessively high, reduces manufacturing costs, and can ensure motor performance. Moreover, when a plurality of the hairpins are inserted into the stator, a portion of the overlapping parts of the hairpins is bent toward the outside of the center of the stator, thereby having the effect of making it easy for the plurality of hairpins to be inserted overlapped.

The present invention relates to the field of electric drive devices and electric motors for industrial applications, and more particularly to an arrangement and a method for controlling an asynchronous motor and a frequency converter. The arrangement of the present invention for controlling an asynchronous motor (3) comprises an inverter unit (2) arranged to drive said asynchronous motor (3); a flux sensor unit (4) comprising polyphase flux sensor / sensors placed in the airgap of said asynchronous motor (3) arranged to measure the polyphase airgap flux ψ ag,a , ψ ag,b ,... ψ ag,m of the asynchronous motor (3); a flux observer (5); and polyphase current sensors (31); wherein said flux observer (5) is arranged to calculate a flux estimate [I] utilizing a received airgap flux value, at least one received stator current value and either one of a received / calculated stator voltage reference or a received stator voltage value, and wherein said flux observer (5) is used in control of said asynchronous motor (3).

The application provides a rotor structure and a single-phase induction motor. The rotor structure comprises a rotor core (2), a plurality of conductor grooves (6) are arranged on the rotor core (2), and rotor slots (21) extending to the outer circle of the rotor are arranged on the outer side of the conductor grooves (6). The rotor slots (21) are divided into a plurality of groups, each group of rotor slots (21) comprises at least two kinds of rotor slots (21) with different radial heights, and the plurality of groups of rotor slots (21) are arranged in sequence and at intervals along the circumference of the rotor core (2), and the rotor toothed shoes (8) are formed between adjacent rotor slots (21). According to the rotor structure, the air gap magnetic field harmonics of the motor can be reduced, the influence of electromagnetic force can be reduced, and the vibration noise of the motor can be reduced.

A solid-state controller for limiting startup current in an induction motor is provided. The solid-state controller includes a first comparator configured to generate a first comparison based on comparing a rotor speed of the induction motor with a rotor speed threshold. The solid-state controller includes a phase current limiter configured to generate a startup current limit based on the comparison received from the first comparator. The solid-state controller includes a second comparator configured to generate a second comparison based on comparing a startup current of the induction motor with the startup current limit. The solid-state controller includes a microprocessor configured to generate a firing phase angle based on the second comparison, where the firing phase angle is a phase angle at which the solid-state controller is turned on, and generate a stopping time at which the solid-state controller is turned off.

A method for controlling an induction motor and an electric power converter, the electric power converter (20) comprising means configured to receive an indication from a second electric power converter (30), the indication indicating that the second electric power converter (30) has stopped controlling an induction motor (60), means configured to determine an estimate of a rotating magnetic flux of the induction motor (60), wherein the determining is at least initiated in response to receiving the indication and means configured to start to control the induction motor (60) by the electric power converter (20) based on the determined estimate of the rotating magnetic flux of the induction motor (60).

The invention provides a bridge crane flexible falling control method, system and device based on an S-shaped curve speed regulation algorithm, and belongs to the technical field of engineering machinery, the control method comprises the following steps: 1, analyzing constraint conditions of a bridge crane in a hoisting working process, and establishing a model of the bridge crane at a balance position in the hoisting process; 2, designing an acceleration track, a speed track and a displacement track of load falling based on the model of the bridge crane in the hoisting process, namely finishing S-shaped track planning of load falling; 3, after the S-shaped track is coded into MATLAB, the rotating speed of the three-phase alternating-current asynchronous motor is controlled through a rotating speed closed-loop PI, closed-loop adjustment is achieved under constant-voltage-frequency-ratio open-loop control, the planned S-shaped track is tracked, and flexible falling of the hoisting load is achieved. On the basis of not changing the mechanical structure of the bridge crane, the flexible falling of the three-phase alternating-current asynchronous motor in the crane during hoisting is controlled by designing a control algorithm.

The invention discloses an evaporative cooling type nitrogen cooling device for an underground coal mine, and belongs to the technical field of cooling devices. A cooling system and an air flow and spraying system are arranged in the device shell; the cooling system comprises an evaporative condenser, a screw type refrigeration compressor, an oil separator, a liquid storage device, a shell-and-tube evaporator and a three-phase asynchronous motor, the three-phase asynchronous motor is connected with the screw type refrigeration compressor, the screw type refrigeration compressor is connected with the oil separator, the oil separator is connected with the evaporative condenser, the evaporative condenser is connected with the liquid storage device, and the liquid storage device is connected with the shell-and-tube evaporator. The liquid storage device is connected with the shell-and-tube evaporator, and the shell-and-tube evaporator is connected with the screw refrigeration compressor; the air flow and spraying system comprises a mining fan, a mining water pump, a spraying water tank and a spraying pipe, the spraying water tank is connected with the mining water pump, the mining water pump is connected with the spraying pipe, and an air blowing opening of the mining fan is aligned with the evaporative condenser. The defect of independent heat removal of air and water flow is overcome, coupling sufficient heat exchange is achieved, and stable operation of a unit is guaranteed.

The present invention discloses a predictive control method for an AC induction motor based on gradient descent, comprising the following steps: establishing a mathematical model of the AC induction motor, adopting a sliding model reference adaptive (MRAS) observer, and a gradient descent iterative method. The gradient descent iterative method is adopted as an adaptive law, iterating in the opposite direction of the gradient of a quantization error to find the minimum value of the quantization error, performing model predictive torque control, and obtaining the switching state of an upper arm switch tube of each phase in an inverter in a drive system of the AC induction motor. The switching state that minimizes a cost function is selected and output to the inverter, so as to accurately and quickly minimize the error and achieve current tracking performance similar to that of a carrier.

The invention discloses a calibration method for an induction motor, and the method comprises the steps: carrying out the optimal flux linkage calibration: dividing the torque into a plurality of equal parts according to the maximum output torque of the motor, and sequentially increasing the torque; giving a first basic rotating speed, adjusting the flux linkage value under each torque, and taking the flux linkage value corresponding to the torque precision of the motor driving system meeting the requirement and the highest efficiency of the motor driving system as an initial flux linkage value; and completing optimal flux linkage calibration under each torque by taking the initial flux linkage value as a reference. According to the invention, the flux linkage is distributed at a fixed rotating speed, and the method has the advantages of systematically optimizing the torque-flux linkage characteristic, improving the operation precision and efficiency in a full rotating speed range, and giving consideration to high-precision torque output and high-efficiency operation.

The present invention discloses a method for parameter identification of a doubly-fed induction motor based on an adaptive extended Kalman filter, which addresses the problems of low accuracy and integrity, noise sensitivity, and other issues in the prior art of doubly-fed induction motor parameter identification. Based on the dq-axis flux equation and voltage equation of the doubly-fed induction motor, the present invention constructs a state space model with the stator and rotor dq-axis currents as state variables, expands the dimension of the state space model, utilizes the adaptive extended Kalman filter theory, and combines the rank criterion to determine the motor resistance R s 、R r and inductor L s , L r , L m The full observability of all parameters enables full parameter identification of the motor inductance and resistance, and enhances system robustness through adaptive adjustment of noise covariance. This invention effectively eliminates the effects of parameter coupling and improves identification accuracy. The adaptive noise suppression mechanism enhances anti-interference capabilities, meeting the requirements for dynamic online identification of doubly-fed motor parameters.

The invention belongs to the technical field of motor end covers, and particularly relates to a three-phase asynchronous motor end cover insulation structure which comprises a base, a front end cover, a weftless tape and bolts, a first insulation washer and a second insulation washer are arranged between the base and the front end cover, and the weftless tape is wound on the matching surface of the base and the front end cover. The first insulating washer and the second insulating washer are arranged between the motor base and the front end cover, and the weftless tape winding and the epoxy resin coating are matched, so that multiple insulating barriers are formed, a metal conductive path between the end cover and the motor base is effectively blocked, the possibility of shaft current generation is reduced, and the service life of the motor is prolonged. The first insulating washer and the second insulating washer adopt a composite structure with a sealing ring, good sealing is realized while the insulating property is ensured, dust and moisture are prevented from invading into the motor, the operation reliability of the motor is improved, the insulating tubes are sleeved among the bolt, the end cover and the base, the electrical isolation of the connecting part is ensured, and the bolt is prevented from becoming an electric leakage channel.