479 results about "Induction machine" patented technology

The invention belongs to the technical field of motor fault diagnosis, and particularly relates to an asynchronous induction motor fault intelligent detection method based on a multi-modal time sequence. The method comprises the following steps: acquiring various signals of a motor, including three-phase current, vibration, equipment sound, environment sound and the like, and constructing a multi-modal data set; thirdly, constructing a Transform network classified by a single time sequence, and on the basis of the Transform network, connecting a plurality of the networks in parallel to obtain a lumped Transform network; and then, features of different modal data are dynamically integrated by using a self-attention mechanism, and accurate recognition of a motor fault is realized. In a network training process, a hyper-parameter of the lumped Transform network is optimized by adopting a chaos WOA algorithm; finally, different types of faults of the asynchronous motor can be accurately detected and judged, the situation that different fault features of the motor cannot be accurately represented by a single time sequence is avoided, and the accuracy and reliability of fault detection of the asynchronous motor are guaranteed.

The invention discloses a current disturbance compensation control method, device and system for a duplex-winding induction motor, and the method comprises the steps: obtaining a DC bus voltage value of a control winding corresponding to the duplex-winding induction motor, carrying out the analysis and processing based on a feedback adjustment model, and giving a current given value of the control winding corresponding to the duplex-winding induction motor; obtaining current values of double windings corresponding to the double-winding induction motor, carrying out observation analysis processing based on a disturbance observation model, and giving a current disturbance observation value of a control winding; based on a feed-forward compensation control model, performing feed-forward compensation analysis processing on the current disturbance observation value and the current given value of the control winding, and giving a voltage given value of the control winding; the output of the duplex winding induction motor is adjusted based on the voltage given value and the current given value of the control winding. According to the invention, control winding current disturbance can be observed, disturbance compensation is realized through feedforward, and finally decoupling control of the control winding current and the power winding current is realized.

The invention discloses an induction motor, a compressor and refrigeration equipment, and relates to the technical field of motors, the induction motor comprises a stator component and a rotor component; the stator component comprises a stator core, the stator core comprises a stator punching sheet, the stator punching sheet comprises a stator yoke and a plurality of stator teeth which are arranged on the inner side of the stator yoke and are arranged at intervals in the circumferential direction of the stator yoke, and every two adjacent stator teeth form a stator groove; the rotor component is arranged on the inner side of the stator component, the rotor component comprises a rotor core, the rotor core comprises a rotor punching sheet, and the rotor punching sheet is provided with a plurality of rotor grooves which are arranged at intervals along the circumferential direction of the rotor punching sheet; wherein the groove height of the rotor groove is # imgabs 0 #, the radius of the rotor punching sheet is # imgabs 1 #, and the groove height of the stator groove is # imgabs 2 #; the thickness of the stator yoke is # imgabs 3 #, and the distance from the bottom of the rotor slot to the center of the inner circle of the rotor punching sheet is # imgabs 4 #; and the formula is as follows: 1.65 # imgabs 5 # 3.3. According to the induction motor, the efficiency of the induction motor can be improved.

A system for controlling an operation of an induction motor is provided. The induction motor includes circuitry and a memory having instructions stored thereon that, when executed by the circuitry, causes the system to collect time-domain measurements of a stator current of the induction motor operating under varying conditions. The system transforms the time-domain measurements into a spectral domain using a sequence of STFTs based on sliding time windows over the time-domain measurements. The system performs spectral analysis in the spectral domain of the stator current to determine harmonics of different types present in the stator current of the induction motor and stabilize the determined harmonics to a shape of corresponding harmonics of the induction motor when operating under steady-state conditions. The system performs one or a combination of control, fault detection, and / or monitoring of the induction motor based on the stabilized harmonics of the induction motor.

The invention relates to the technical field of intelligent control and information security crossing, in particular to an anti-error data injection Kalman filtering method based on neural network enhancement, which comprises the following steps: firstly, constructing a neural network auxiliary correction module for identifying and correcting an extended Kalman filtering intermediate variable affected by an error data injection attack; secondly, designing a hybrid filtering architecture, and combining the learning ability of a neural network with the theoretical advantages of traditional Kalman filtering; and finally, realizing adaptive optimization of model parameters through a mixed training mechanism. Accurate state estimation can be achieved only through limited prior information, and meanwhile the calculation efficiency and interpretability of a traditional Kalman filter are kept. And the anti-interference capability of the system in a non-Gaussian noise environment is effectively improved. The application of the method on an induction motor model is obviously better than that of a traditional anti-error data injection scheme, and breakthrough progress is achieved in the aspects of estimation precision and robustness.

A rotor cooling structure includes a turbine blower structure provided on first and second sides of a rotor for an induction motor; a refrigerant passage including a plurality of refrigerant passage inlet openings provided on a bottom surface of the turbine blower structure and a plurality of refrigerant passage outlet openings provided at an axial center of the rotor, which fluidically communicates with the refrigerant passage inlet openings and the refrigerant passage outlet openings and is provided along conductor bars of the rotor; and a plurality of micro groove patterns that hold the refrigerant passage outlet openings and are provided on both axial sides of the rotor on an external periphery of the rotor.

The present invention provides an adaptive filtering method, device, fault detection method, electronic device and medium, including performing fast Fourier transform on a voltage time domain signal to obtain a voltage frequency domain signal, selecting a frequency point within a first preset sequence number range and a frequency point within a second preset sequence number range, and setting the values ​​of other frequency points to 0, performing inverse fast Fourier transform on the processed voltage frequency domain signal to obtain an estimated signal of the voltage power frequency signal; based on a Wiener filter, using the estimated signal of the voltage power frequency signal, filtering the collected current time domain signal to filter out the power frequency signal contained therein. In this way, the adverse effects of direct current and high-order harmonic signals in the voltage time domain signal on filtering are eliminated, so that the current power frequency signal can be filtered out more thoroughly, so as to more accurately identify the current component signal located in the rated power frequency sideband from the current spectrum, thereby improving the reliability of detecting the rotor broken bar fault of the asynchronous induction motor.

The present invention provides an energy-storage emergency power supply and driving control method and apparatus for a mine induction motor hoist. The method comprises: acquiring working states of a mains power loop 1 and a mains power loop 2 in real time; on the basis of abnormal working states of the mains power loop 1 and the mains power loop 2, determining whether to disable a mains power supply mode and enable an emergency power supply mode; enabling the emergency power supply mode, and switching the hoist from mains power supply to emergency power supply; starting hoist auxiliary units and a hoist electric control unit, and determining whether the hoist meets an operation condition; receiving a hoist operation instruction, and on the basis of the operation instruction, controlling the hoist to operate; and exiting an emergency working mode, and switching the hoist from the emergency power supply to the mains power supply. The present invention uses a combination of new energy storage and conversion to replace the original diesel engine power generation system, solving the problem of emergency power supply of a control system for a mine induction motor elevator, allowing for rapid establishment of an emergency rescue hoisting channel, and providing a safety guarantee for mine workers and production.

Methods and systems for controlling the torque of an electric machine propelling a vehicle when the vehicle is stopped are described. These methods and systems can be applied to synchronous and induction electric machines configured to propel a vehicle. The methods and systems enable the electric machine to output a constant quantity of torque when both the vehicle speed and the speed of the electric machine are zero.

The invention provides a high-speed induction motor solid rotor structure and a motor, the rotor structure comprises an integrated conductive and magnetic conductive rotor and a rotating shaft, the surface of the rotor is provided with two groups of grooves, any groove in any group and all grooves in the other group are arranged in a staggered manner along the circumferential direction of the rotor, and the two groups of grooves are arranged at intervals along the axial direction of the rotor. Distances are reserved between the far ends of the two groups of grooves and the close end faces of the rotor. The motor comprises the solid rotor structure. The two sections of non-penetrating rectangular straight grooves are axially formed in the surface of the rotor, so that the equivalent impedance of the rotor part is increased, the penetration depth of an air-gap magnetic field in the rotor is increased, the torque output capacity of the motor is improved, and meanwhile, the eddy current strength of the surface of the rotor is weakened.

The invention provides an electromagnetic quasi-zero stiffness vibration isolation device and method based on a composite nested structure, and belongs to the technical field of vibration isolation. The device comprises a supporting base, two linear induction motor assemblies symmetrically arranged on the base and provided with a preset gap, and a suspension supporting frame composed of a vertical conductive supporting plate and a horizontal magnetic conductive supporting plate. The vertical conductive supporting plate can float up and down in the gap and forms a positive stiffness module for providing main supporting force and positive stiffness with the motor assembly, and the two eddy current stator pairs are symmetrically distributed on the left side and the right side of the horizontal magnetic conductive supporting plate and form a negative stiffness module for providing negative stiffness with the horizontal magnetic conductive supporting plate; each eddy current stator pair comprises an upper eddy current stator assembly and a lower eddy current stator assembly which are mutually exclusive up and down and float on the upper side and the lower side of the horizontal magnetic conductive supporting plate; the positive and negative stiffness modules are coaxially arranged and cooperate in parallel through a composite nested structure to realize the quasi-zero stiffness characteristic; the rigidity can be dynamically adjusted, and the vibration isolation effect and reliability are improved.

The invention discloses an induction motor model predictive current control method based on a generalized flux linkage error and a closed-loop flux weakening strategy, and belongs to the field of induction motor speed regulation control. According to the method, the problem that the existing control method cannot simultaneously meet the requirements of not adding extra flux weakening weight factors in a value function, not depending on motor parameters, carrying out closed-loop control and not causing current following error increase under single-vector model predictive current control is solved. The method specifically comprises the steps of 1, defining a generalized flux linkage vector reference value and a generalized flux linkage predicted value, and obtaining a relation between a basic generalized flux linkage vector and a basic voltage vector according to the generalized flux linkage predicted value; step 2, obtaining a value function of single vector model predictive current control of the induction motor according to a result of the step 1; and step 3, obtaining an optimal voltage vector according to the value function, and generating a flux weakening current component for compensation according to the basic generalized flux linkage vector corresponding to the optimal voltage vector. The method can be applied to model predictive current control of the induction motor.

The utility model discloses an induction motor, compressor and refrigeration equipment, relates to the motor technical field, the induction motor comprises a stator part, a stator iron core comprises a plurality of stator punching sheets laminated along the axial direction of the stator iron core, each stator punching sheet comprises a stator yoke and a plurality of stator teeth arranged on the inner side of the stator yoke and arranged along the circumferential direction of the stator yoke at intervals, a stator slot is formed between every two adjacent stator teeth; wherein any two intersection points exist between a line segment of the stator punching sheet passing through the circle center and the outer contour of the stator punching sheet, the maximum value of the line segment between any two intersection points is L1, the minimum value of the line segment between any two intersection points is L2, and L1 / L2 is greater than or equal to 1.02 and less than or equal to 1.2, the tooth width of the stator teeth is W1, the maximum slot width of the stator slots is W2, W2 / W1 is greater than or equal to 2.6 and less than or equal to 3.6, the minimum stator yoke width of the stator punching sheet is Y1, the inner diameter of the stator punching sheet is L3, and Y1 / ((L1-L3) / 2) is greater than or equal to 0.3 and less than or equal to 0.45. According to the induction motor, the efficiency of the induction motor can be improved, and the calorific value is reduced.

The invention discloses a vehicle parking control method and device based on an induction motor and a vehicle. The method comprises the steps that after an accelerator of the vehicle is released, whether a motor meets a preset condition or not is judged; if the motor meets the preset condition, the feedback rotating speed of the motor is controlled to be zero, and the output of the weak magnetic regulator is closed, otherwise, the target rotating speed of the motor is reduced according to the preset deceleration, and the feedback rotating speed of the motor is controlled to be the actual rotating speed of the motor; determining a first output value of a rotating speed control strategy according to the target rotating speed and the feedback rotating speed; determining a second output value of the first current control strategy according to the first output value; and determining a fourth output value of the second current control strategy according to the first output value and a third output value of the weak magnetic regulator, controlling the motor to operate according to the second output value and the fourth output value, and returning to execute the step of judging whether the motor meets the preset condition. According to the technical scheme, vehicle parking can be well controlled.

The invention discloses a constant-speed and variable-speed induction motor acoustic fault diagnosis method based on a Transform-SE attention mechanism and a convolutional neural network, and belongs to the field of sound signal processing. And the data is converted into a two-dimensional time-frequency graph through short-time Fourier transform so as to construct a data set. Then, the data set is used for training a hybrid diagnosis model which is jointly constructed by a convolutional neural network, a Transform module based on Patch and an SE module; the CNN is used for extracting local time-frequency features, the Transform module captures a cross-regional global dependency relationship, and the SE module adaptively enhances key channel features. According to the method, local details and global context information can be effectively fused, and stable and high-precision identification of various motor faults is realized under complex working conditions including constant speed, variable speed, no-load and full load.

The invention relates to the field of unit operation, and discloses a small submersible pump capable of backwashing regularly, which comprises a shell, an induction motor mechanism, an impeller mechanism, an anti-backflow mechanism, a backwashing pollution discharge mechanism, a switch mechanism and a control module, the shell is divided into an inner shell and an outer shell, and the inner shell and the outer shell are both hollow; the induction motor mechanism is fixedly connected to the inner shell, the impeller mechanism is fixedly connected to the interior of the shell and is connected with the induction motor through a rotating shaft, the backflow prevention mechanism is installed in the shell and is installed on one side of the submersible pump, and the backwashing sewage discharging mechanism is fixedly connected to the interior of the shell. The switch mechanism is fixedly connected to the interior and the exterior of the shell, the control module is fixedly connected to one side of the shell, the control module receives numerical values of the flow detection sensor and sets timing washing time during work, backwashing is conducted on the submersible pump, and a filter screen of the submersible pump is effectively prevented from being blocked by dirt. The service life and the working efficiency of the submersible pump and components thereof are prolonged.

The utility model discloses a stator assembly, a motor, a compressor and refrigeration equipment, and relates to the induction motor technology field, the stator assembly comprises a stator iron core and a stator winding, the stator iron core is provided with Q stator grooves, and the stator grooves are divided into large grooves and small grooves according to the sectional area; the stator winding comprises a primary winding and a secondary winding which are wound concentrically; the main winding is provided with m coils, and the secondary winding is provided with n coils; the main windings are B1, B2, B3... Bm in sequence from large to small according to the winding span; the secondary windings are A1, A2, A3... An in sequence from large to small according to the winding span; at least one single main winding groove is formed in the stator grooves where the coils between B2 and Bm are located, only main windings are arranged in the single main winding grooves, and at least one of the single main winding grooves is a small groove; 16 < = Q < = 32, 3 < = m < = 14, and 3 < = n < = 12. The technical scheme provided by the utility model is used for reducing the harmonic ratio of the motor so as to reduce the calorific value of the motor and improve the efficiency of the motor.

The invention relates to an equivalent magnetic network modeling solving method for a planar induction motor. The method comprises the following steps: dividing an electromagnetic field solving area of the planar induction motor; giving size structure parameters and input parameters of the planar induction motor, and establishing an axial magnetic flux three-dimensional cylindrical coordinate system; establishing a preliminary magnetic network model, determining position angle information of grid nodes, and performing numerical solution of a cross-shaped magnetic conductance unit; according to the air gap layer connection node position angle information, adaptively connecting an air gap dynamic node; carrying out cubic spline interpolation solution on the magnetic conductivity of the nonlinear magnetic conductance unit based on a nonlinear ferromagnetic material B-H curve, and carrying out iterative solution through a relaxation coefficient method; and after iteration is completed, air gap flux density solving is realized.

The invention discloses a rapid and accurate stray loss analysis method for an induction motor. A sine wave excitation space harmonic module, an inversion feed excitation space harmonic module and a stray loss module form a stray loss and space harmonic relation system; the stray loss system under the influence of the output power is composed of a surface eddy current loss system composed of a magnetization inductance module, a harmonic amplitude module and a surface eddy current loss module and a magnetic flux pulsation loss system composed of a harmonic amplitude module, a stator harmonic stray loss module, a rotor harmonic stray loss module and a magnetic flux pulsation loss module. The stray loss system under the influence of the output power, the stray loss system under the influence of the power supply frequency and the stray loss system under the influence of the total harmonic distortion of the current form a stray loss system under the influence of multiple factors; the loss analysis provided by the invention can distinguish stray loss values of motors with the same rated power but different efficiency levels.

The invention relates to the technical field of motor control, and discloses an induction motor rotor time constant adaptive control method, system and device, and the method comprises the steps: determining a rotor time constant estimation value based on the reactive power deviation of a model reference adaptive system; determining a rotor resistance estimation value according to the rotor time constant estimation value and a rotor inductance parameter value obtained in real time; performing low-pass filtering on the rotor resistance estimation value to generate a filtering value; updating a rotor time constant feed-forward value based on the rotor inductance parameter value and the filtering value; and based on the rotor time constant feedforward value, optimizing a convergence process of the rotor time constant estimation value so as to perform indirect vector control of the induction motor. The method has the beneficial effect that the convergence speed and robustness of adaptive identification of the rotor time constant are improved.

To provide an inexpensive mold exchange device for an injection molding machine.SOLUTION: A mold exchange device for an injection molding machine of the present invention includes: an injection molding machine; a mold exchange carriage movably provided next to the injection molding machine; and a carriage control system that controls a stop position of the mold exchange carriage. In the mold exchange device for the injection molding machine, the mold exchange carriage is moved by an induction motor, and the carriage control system has a positioning block whose movement stopping is controlled by a servo motor, and a positioning cylinder that abuts against the positioning block to stop the movement of the mold exchange carriage.SELECTED DRAWING: Figure 3

A method for measuring magnetic saturation profiles of a synchronous machine having a rotor and a stator includes actuating the synchronous machine with clocked terminal voltages according to a pulse width modulation process. The method further includes cyclically measuring a current of the synchronous machine resulting from the synchronous machine being actuated by the clocked terminal voltages. The method further includes applying macroscopic flux pulses which allow the current to momentarily increase into a range that can change a magnetic saturation state of the synchronous machine.

The present invention belongs to the technical field related to brake disc unloading, and is particularly a device for automatic unloading of brake discs, including a conveying roller, an unloading manipulator and a supporting frame, wherein an induction motor is installed in front of the conveying roller, and a transmission mechanism is provided on the rear side of the conveying roller, a guide rail is installed on the inner wall of the transmission mechanism, and a parallel moving base plate is provided on the upper side of the guide rail, and a drag chain is connected to one side of the parallel moving base plate, and the unloading manipulator is fixed above the parallel moving base plate. The present invention sets a servo motor and an extension rod servo module, and when the brake disc is detected to be in place, the overall extension rod servo module moves synchronously with the overall hanging, and when the parallel moving base plate moves to a suitable position, the extension rod servo module moves in the overall Z axis, and the X-axis clamping shaft moves synchronously to clamp the brake disc into the groove on the clamping claw, thereby grabbing the brake disc.

The present invention relates to a speed sensorless induction motor wide-speed-range stable operation system and a method. According to the system, orthogonal characteristics of a rotor flux linkage are used to correct a voltage model of an induction motor, a rotor flux linkage observer and a stator current extended state observer are established, and a motor observation model is reconstructed; an extended state variable is taken as a feedback item to ensure the stability of rotor flux linkage estimation; and speed information is extracted from the rotor flux linkage estimation by means of phase-locked loop, thereby implementing induction motor sensorless control. The present invention involves a reasonable design, can effectively improve the operation stability of a speed sensorless induction motor in a low-speed power generation mode and a high-speed range, and achieves wide-speed-range sensorless stable control.

The invention relates to the technical field of magnetic suspension, and aims to solve the problems that the layout mode that a suspension electromagnet and a linear induction motor of a traditional magnetic-levitation train are independent of each other occupies a large space, and normal force of the linear induction motor has a negative effect on suspension force. The invention provides a magnetic-levitation train traction suspension combined type induction rail and a traction suspension system electromagnetic structure. The traction suspension combined type induction rail comprises an electromagnet induction rail body, the electromagnet induction rail body is arranged below a track beam in the line direction, protrusions are downwards formed on the two sides of the electromagnet induction rail body, the end faces of the protrusions are the pole faces of the electromagnet induction rail body, and an installation cavity is formed between the protrusions on the two sides. A mounting rail is arranged in the mounting cavity, and the mounting rail is connected with the electromagnet induction rail; a plane is formed at the bottom of the mounting rail and is a secondary mounting surface of the linear induction motor; according to the invention, the occupied space can be reduced, and the suspension performance of the vehicle can be improved.

The invention relates to the field of motors, provides a rotor and a manufacturing method thereof, is applied to an asynchronous induction motor, and comprises a rotor core, guide bars and end rings. A plurality of tooth grooves are formed in the circumferential direction of the rotor iron core, and the two ends of each tooth groove penetrate through the two end faces of the rotor iron core in the axial direction respectively; the conducting bars are independently processed and formed, the conducting bars are inserted into the tooth grooves, and the two ends of each conducting bar protrude out of the two end faces of the rotor iron core in the axial direction respectively; the two end rings are respectively arranged at two ends of the rotor core in the axial direction, and the two end rings are respectively connected with two ends of each conducting bar into a whole. The guide bars forming the mouse cage are manufactured independently and are connected into a whole through the end rings at the two ends to form a complete mouse cage structure. A traditional casting process often causes pores in a casting. The porosity can be effectively controlled by separately casting the conducting bars and the end rings.

The invention discloses an induction motor torque estimation method, system and device and a storage medium, and relates to the technical field of motors. The induction motor torque estimation method comprises the following steps: determining inductance parameters of a motor; acquiring operation parameters of the motor, and observing the component of the rotor flux linkage of the motor on the Q axis according to the inductance parameters, the operation parameters and a pre-constructed DQ-axis synchronous rotating coordinate system based on stator current vector orientation; and determining the motor torque according to the inductance parameter, the operation parameter and the component of the rotor flux linkage on the Q axis. According to the motor torque estimation method provided by the invention, the motor torque is estimated according to the component of the rotor flux linkage on the Q axis, the motor inductance parameter and the motor operation parameter, and motor body parameters such as resistance cannot be displayed in the estimation process, so that the method is not influenced by load and temperature rise change, and the estimation precision is high.

The invention relates to an industrial motor bearing fault monitoring method and device and a medium, and belongs to the technical field of industrial motor fault monitoring. The method comprises the following steps: establishing a voltage equation, a flux linkage equation, a torque equation and a mechanical kinetic equation of the industrial motor; calculating an inductance matrix of the motor by adopting a winding function correction method; establishing a feature model of the industrial motor bearing fault; and obtaining a fault category according to the established feature model of the industrial motor bearing fault. According to the method and the device, the induction motor with the bearing fault can be dynamically simulated, the stator current spectrum can be calculated to identify the corresponding fault characteristics, and the severity of the bearing fault can be quantified by monitoring the amplitude of the corresponding fault current component.

The invention discloses an induction motor parameter on-line identification method and device based on parameter directional solidification. The method comprises the following steps: step S01, acquiring all parameters required to be identified by an induction motor model; step S02, classifying parameters required to be identified into non-key parameters and non-key parameters; step S03, monitoring the operation state of the power grid and the load characteristic parameters of the induction motor in real time, and performing online identification on each parameter in the induction motor model according to the parameters monitored in real time; in the process of carrying out online identification on each parameter in the induction motor model, firstly, non-key parameters in the parameters needing to be identified are assigned, parameter optimization is carried out to identify each key parameter, the identified key parameters are input into the induction motor model, and then each non-key parameter is identified. And repeatedly executing until an identification result meeting a preset requirement is obtained. The method has the advantages of being simple in implementation method, high in identification efficiency and precision, high in real-time performance and robustness and the like.

The invention relates to a pole-mounted vacuum circuit breaker self-adaptive noise reduction device, and relates to the technical field of pole-mounted vacuum circuit breaker noise removal, the pole-mounted vacuum circuit breaker self-adaptive noise reduction device comprises a rack, a first pedestal and a second pedestal are slidably mounted on the rack, a bearing plate is slidably matched with the side part of the rack, a cylinder is hinged to the bearing plate, and a right angle plate is arranged above the cylinder; a transmission shaft in the right-angle plate is in transmission connection with the output end of the induction motor, the outer wall of the transmission shaft is fixedly sleeved with a rotating plate and a first rotating disc, the first rotating disc is internally sleeved with a first belt strip, the outer wall of a rotating rod on the first pedestal and the second pedestal is fixedly sleeved with a second rotating disc, and the outer portion of an extension rod connected with the rotating rod is fixedly sleeved with a rubber ring; iron rings are fixedly installed on the side end faces of the rubber rings, and a plurality of wire rings are arranged on the peripheries of the iron rings in a sleeving mode. According to the invention, over-limit current generated by poor contact between the isolation knife and the isolation knife holder can be eliminated, high-frequency noise generated by abnormal current can be further eliminated, and the pole-mounted vacuum circuit breaker can be ensured to operate stably and normally.