348 results about "Induction machine" patented technology

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.

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.

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 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 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 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

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 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 utility model relates to the technical field of motors, in particular to a novel brushless direct current motor, which comprises a rotor assembly (100), a stator assembly (200), a first end cover (300) and a second end cover (400), the rotor assembly (100) comprises a rotor (101), a rotor shaft sleeve (102) and rotor magnetic steel (103), and the rotor shaft sleeve (102) is made of aluminum materials; the second end cover (400) is provided with a Hall plate (500), and the Hall plate (500) is provided with three surface-mounted Hall elements (501) used for sensing the rotor magnetic steel (103). Due to the adoption of the structural design, the rotor shaft sleeve of the rotor assembly is made of an aluminum material, so that the distribution of magnetic lines of air gaps in the motor is changed, and the problems of large cogging torque and noise of the motor are effectively solved; a Hall element on the Hall plate directly induces motor rotor magnetic steel in a patch mode, so that the reliability of the motor is greatly improved, the structure is simplified, and assembly is facilitated.

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 utility model discloses a main transmission system of a paper machine, which comprises a net part forming roller, a carpet driving roller, a drying cylinder, a paper winding cylinder, a first motor assembly connected with the net part forming roller, a second motor assembly connected with the carpet driving roller, a third motor assembly connected with the drying cylinder, and a fourth motor assembly connected with the paper winding cylinder, the net part forming roller, the carpet driving roller, the drying cylinder and the paper winding cylinder are sequentially arranged in the running direction of paper, the first motor assembly comprises a first permanent magnet synchronous motor, the second motor assembly comprises a second permanent magnet synchronous motor, and the third motor assembly comprises a third permanent magnet synchronous motor and a fourth permanent magnet synchronous motor. The fourth motor assembly comprises a fifth permanent magnet synchronous motor. According to the paper machine main transmission system, the permanent magnet synchronous motor is adopted, compared with an asynchronous induction motor, a magnetic field can be more effectively utilized, the working efficiency of the paper machine main transmission system is improved, and the overall energy consumption of the paper machine main transmission system is reduced.

This invention presents a method for the optimal design of induction motors with multi-phase or single-phase input power. Motors with multi-phase input power can be easily designed from the basic three-phase motor using this method. Herein, motors that are fed by single-phase power supply reach the desired or complete magnetic balance by installing a capacitor in its circuit. With the help of the presented method, the design of induction motors powered by single-phase alternating voltage is done in accordance with the basic three-phase induction motors, and thus achieving the efficiency of the primary three-phase induction motor becomes possible. Three-phase induction motors have an output power of 120-3000 watts, usually with a power factor 0.6 to 0.8 and in fewer cases 0.4 to 0.6. The mentioned method is optimally used to convert these motors into induction motors are fed by single-phase power supply with two-phase or three-phase internal structures.

The present invention relates to a method for controlling the normal vibration stability of a maglev train based on a transfer function. The steps are as follows: Obtain the mechanical structure parameters and electromagnetic parameters of the linear induction motor for the maglev train, and establish a mathematical model of the normal force of the linear induction motor; Obtain the dynamic model of the medium and low-speed maglev train considering the normal force through the spring-damping coupling model of the medium and low-speed maglev train; Perform Laplace transform on both sides of the obtained dynamic model of the medium and low-speed maglev train considering the normal force; Obtain the transfer function of the normal vibration of the maglev train according to the dynamic model of the medium and low-speed maglev train considering the normal force obtained by the Laplace transform; Perform stability control on the operation of the maglev train according to the obtained transfer function. The present invention solves the problem that the existing dynamic model of the maglev train does not consider the fluctuation of the normal force of the linear induction motor when established, and cannot analyze the influence of the normal vibration of the linear induction motor on the stable operation of the maglev train.

This invention discloses a stator assembly, a motor, a compressor, and a refrigeration device, relating to the field of induction motor technology. The stator assembly includes a stator core and stator windings. The stator core has Q stator slots, which are divided into large slots and small slots according to their cross-sectional area. The stator windings include concentrically wound main windings and auxiliary windings. The main windings have m coils, and the auxiliary windings have n coils. The main windings are numbered B1, B2, B3...B according to their winding span from largest to smallest. m The secondary windings are numbered A1, A2, A3, ... A, according to their winding span from largest to smallest. n ;B2 to B m In the stator slots where the coils are located, there is at least one single main winding slot, and each single main winding slot contains only the main winding. At least one of the single main winding slots is a minor slot; 16≦Q≦32, 3≦m≦14, 3≦n≦12. The technical solution provided by this invention is used to reduce the harmonic ratio of the motor, thereby reducing motor heat generation and improving motor efficiency.

A conveyor system for transporting goods within a warehouse facility. The system includes an array of rails and a carriage movable along the rails to transport goods within the warehouse facility. The drive system includes a driver spaced along the guide rail. The drive may advance the carriage along the guide rail using a linear induction motor. The linear induction motor uses a stepping motor, and optionally a micro-stepping motor. The warehouse management system controls the linear drive system to transport goods throughout the warehouse facility for storage and order fulfillment. A linear drive conveyor system includes a vertical transfer where a carriage can be transferred from one conveyor line to another, without the need for a mechanical process such as lifting or cushioning to move the carriage between the conveyor lines.

In order to improve the energy efficiency and the power-to-weight ratio of an alternating-current asynchronous induction motor, the current direction of a lead frame of the closed reluctance motor surrounds along the axial direction and the end face of a reluctance body to form a closed induction magnetic field, so that the power-to-weight ratio and the energy efficiency can be improved. The motor structure comprises a rotor, a casing, a lead frame and a bearing, or comprises a rotor, a casing, a lead frame, a bearing and a stator, and is characterized in that the rotor comprises a shaft rod and a magnetic resistance body, the casing is a fixing piece for supporting the lead frame and the rotor, the lead frame is a rectangular lead winding, has two phases or three phases and is distributed along the circumference of the rotor at a certain angle, and the magnetic resistance body is arranged on the shaft rod. The rotor is sleeved with the lead frame, the lead frame is electrified with alternating current to form a rotating magnetic field, closed-loop current and a radial magnetic field are generated in the rotor, and the rotating magnetic field drags the rotor to rotate relatively in the lead frame.

The utility model discloses a rotary induction magnet structure for a coded disc of a brake controller, which is connected to the coded disc of the brake controller and comprises a motor, and a main shaft of the motor is connected to the center of the coded disc of the brake controller through a bearing; a magnet is embedded and fixed at the end part of a spindle of the motor; an inductive probe is arranged in a shell of the motor; a signal wire connected with the inductive probe is arranged in a shell of the motor, and the end part of the signal wire is connected with a plugging terminal in a plugging manner; the motor rotates to drive the magnet to rotate, the induction probe inducts the number of rotation turns of the magnet and transmits induction signals to the motor control circuit board, and the motor control circuit board controls the motor to rotate reversely and reset. According to the utility model, the structure arrangement is reasonable, the magnet is embedded at the end part of the main shaft of the motor and is matched with the inductive probe in the shell of the motor to induce the number of rotation turns of the main shaft of the motor, and the motor is enabled to reversely rotate corresponding turns for resetting through the motor control circuit board, so that the effectiveness and stability of resetting are ensured, and the brake effectiveness and smoothness are improved.

The embodiment of the utility model provides a motor and an electric toothbrush. The motor comprises a motor body and a position detection device. The motor body comprises a motor shell and a motor shaft, the motor shaft is installed on the motor shell and can move relative to the motor shell, and the motor shell comprises a cylinder part and an end cover installed at any end of the cylinder part. The position detection device is installed at one end of the motor shell and comprises a first induction piece and a second induction piece, the first induction piece is directly or indirectly connected with an end cover at the end of the motor shell in an abutting mode so as to be matched with the end cover to be located and installed on the motor shaft, and the first induction piece can move along with the motor shaft. The second induction piece is arranged on the side, opposite to the end cover, of the first induction piece, and the second induction piece is used for being matched with the first induction piece so as to induce the movement position of the motor shaft. According to the position detection device, the first induction part and the end cover are abutted and matched for positioning, so that the positioning error of the first induction part in the axial direction of the motor shaft can be reduced, and the detection reliability of the position detection device is improved.

Embodiments of the present disclosure relate to soft turn-off for motor controllers. A bidirectional switch for an induction motor is described. The bidirectional switch can include a first power semiconductor transistor having a first source, a first drain, and a first gate. The bidirectional switch can also include a second power semiconductor transistor having a second source, a second drain, and a second gate. The bidirectional switch can include the second source connected to the first source. The bidirectional switch can include a soft start device including a control circuit configurable to provide a first control signal to the first power semiconductor transistor and a second control signal to the second power semiconductor transistor.

The invention relates to cooking fume treatment equipment, in particular to a cooking fume purification device which comprises a fume collecting pipeline, an impeller, a driving mechanism and a radial magnetic suspension bearing, and a fume exhaust channel communicated with the outside is formed in the fume collecting pipeline; the impeller is positioned in the smoke exhaust channel; the driving mechanism comprises a rotating shaft and a magnetic bearing motor, the rotating shaft is connected with the impeller, and the bearing motor is arranged in the smoke collecting pipeline and arranged on the peripheral side of the rotating shaft in a sleeving mode to drive the rotating shaft to rotate along the axis of the rotating shaft. The radial magnetic suspension bearing is arranged in the smoke collecting pipeline and arranged on the peripheral side of the rotating shaft in a sleeving mode, the radial magnetic suspension bearing can support the rotating shaft to be located at the axis position of the bearing motor through magnetic force, and compared with a traditional induction motor, the problem of noise generated by friction is avoided to a certain degree; and the friction loss is avoided, so that the efficiency of the motor is further improved.

The invention discloses an induction motor control method and system and a medium. The control method comprises the following steps: acquiring a d-axis current # imgabs0 #, a q-axis current # imgabs1 #, a q-axis voltage # imgabs2 #, a d-axis voltage # imgabs3 # and a slope given frequency # imgabs4 # of a stator side of an induction motor at the current moment in real time; and the observer estimates the synchronous frequency # imgabs10 #, the rotor rotating speed # imgabs11 #, the slip frequency # imgabs12 #, the rotor magnetic field angle # imgabs13 # and the rotor flux linkage vector # imgabs14 # of the induction motor in real time according to the d-axis current # imgabs5 #, the q-axis current # imgabs6 #, the q-axis voltage # imgabs7 #, the d-axis voltage # imgabs8 # and the slope given frequency # imgabs9 # at the current moment. Whether the slope given frequency # imgabs15 # is smaller than a set threshold value # imgabs16 # or not is judged, and switching between the first control stage and the second control stage is conducted according to the judgment result. Current and rotating speed double-closed-loop control is adopted in the first control stage, speed fluctuation of the first control stage can be effectively restrained, on-load output current is reduced, current impact at the switching moment of the first control stage and the second control stage is reduced, and the switching stability between the first control stage and the second control stage is improved.

There is provided an induction machine (100) comprising a rotor (120); a stator (140); and a phase-shift oscillator (160). The stator comprises: a first winding (141); and a second winding (142), arranged at a first angle (101) relative to said first winding. The phase-shift oscillator comprises: a transistor (170), the transistor (170) being a high-electron mobility transistor, HEMT; and a phase-shift network (180). The first winding is connected to a first node (181) of the phase-shift network and wherein the second winding is connected to a second node (182) of the phase-shift network, wherein the phase-shift oscillator is configured to provide a first phase electric signal at the first node and a second phase electric signal at the second node, wherein a difference between the first and second phase corresponds to the first angle. There is also provided an electric aircraft propulsion system comprising the induction machine.

The invention relates to a motor control circuit, a motor control method, a motor control device, terminal equipment and a storage medium. The inverter circuit is connected with the direct-current power supply and is used for converting direct current provided by the direct-current power supply into three-phase alternating current; the transmitting end of the three-phase wireless transmission circuit is connected with the inverter circuit and is used for transmitting the electric energy of the three-phase alternating current to the receiving end; the receiving end is used for receiving the electric energy sent by the transmitting end and generating three-phase alternating current; the rectifying circuit is connected with the receiving end and is used for converting the three-phase alternating current generated by the receiving end into three-phase direct current; the three-phase direct current is used for driving the three-phase induction motor to rotate; the three-phase direct current is equal in amplitude and frequency, the initial phase difference is 120 degrees, the direction of the current is unchanged, and the magnitude of the current changes along with time; the sampling circuit is used for collecting current signals flowing through the three stators; the controller is used for adjusting the working state of the inverter circuit according to the current signal and controlling the rotating speed of the induction motor.

The present application relates to dough fermentation equipment technical field, and disclose a kind of temperature and humidity precision regulation and fermentation PLC control equipment, including fermentation tank assembly, the bottom of fermentation tank assembly is fixedly installed with humidification assembly, and fermentation tank assembly is also equipped with placing assembly, and fermentation tank assembly includes PLC controller, and humidification assembly includes atomizing piece, and PLC controller controls and drives atomizing piece to humidify the internal environment of fermentation tank assembly, and placing assembly includes end rod, the height of end rod is adjustable, and end rod array is placed with dough, after dough fermentation is completed, PLC controller controls to close atomizing piece and stop humidification, and fermentation tank assembly includes front tank plate, and the upper side of front tank plate is movably installed with tank door, and the bottom of tank door is equipped with front air induction machine, and the rear side of front air induction machine is installed with front filter layer, the equipment can automatically reduce the humidity and temperature of fermentation environment after dough fermentation is completed, reduce yeast activity, to prevent dough excessive fermentation.