272 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 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.

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.

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.

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.

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.

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.

The utility model discloses a multifunctional hand-washing cleaner which comprises a wall and a hand-washing cabinet body, the hand-washing cabinet body is arranged on one side of the wall, a hand-washing basin is arranged in the hand-washing cabinet body, two cabinet doors are arranged on one side of the hand-washing cabinet body, a collecting box is arranged in the hand-washing cabinet body, and a storage bottle is arranged in the collecting box. A storage bottle is arranged in the collecting box, an induction motor is arranged at the top of the storage bottle, a water outlet induction motor box is arranged in the collecting box, and an angle valve switch is arranged on one side of the water outlet induction motor box. An infrared sensor is arranged in the induction motor, hand sanitizer is stored in the storage bottle, tap water flows out downwards through the tap water outlet, the circular pocket is embedded into the water leakage hole, external sundries can be blocked through the leakage net, and the multi-functionalization of the hand washing cleaner is achieved through the structure.

The present invention belongs to the field of AC servo systems and discloses a method and system for online identification of the rotor time constant of a sensorless induction motor based on a complex coefficient flux observer. The method comprises: estimating the rotor flux using a complex coefficient rotor flux estimator; injecting a biased sinusoidal excitation into the d-axis to obtain the rotor flux and filtered stator current along the dq axes through park transformation; online identification of the rotor time constant using a designed rotor time constant estimator based on a sliding mode observer; and estimating the stator frequency and rotor position using a phase-locked loop. The present invention decouples rotor time constant identification from rotor speed estimation, enabling parallel estimation of the two. The designed rotor flux estimator effectively suppresses DC bias and higher harmonics in back electromotive force. Compared to the traditional least squares method, the designed rotor time constant estimator based on a sliding mode observer improves the robustness of the estimation algorithm while ensuring convergence speed.

What is provided is a variable flux motor being a synchronous or induction motor, including: a stator; and a rotor, in which the stator includes: a stator core; and a winding wound around the stator core, and at least a part of the stator includes a non-linear soft magnetic material.

A rotor assembly is configured to rotate relative to a stator to drive a rotor shaft and at least one drive wheel of an electric vehicle. The rotor assembly includes a rotor core, and first and second bar assemblies. The rotor core includes a core body that defines a plurality of circumferentially arranged bar passages including a plurality of first bar passages and a plurality of second bar passages. The first bar assembly includes a plurality of first bars, each of the first bars having a first elongated blade portion and a first end body portion. The second bar assembly includes a plurality of second bars, each of the second bars having a second elongated blade portion and a second end body portion. the first bars and the second bars are alternately received at the respective plurality of first bar passages and second bar passages in the core body.

The application discloses a magnetic induction motor, comprising: a chip combination body provided with a wire frame coil; a fixed support; a lever penetrating through a movable cavity and extending to the inside of the fixed support, one end of the bottom of the lever being provided with a movable block; a first steel plate arranged at the bottom of the movable block, the front side and the back side of the first steel plate being provided with a second steel plate; springs arranged at the two sides of the movable block and on the top of the first steel plate; and a magnetic block. The application cancels the counterweight block and the connecting rod assembly in the existing structure, adopts a transmission structure in which the lever is directly connected with the movable block, greatly simplifies the overall structure of the motor, reduces the number of parts and the assembly process, effectively reduces the production cost and the operation energy consumption of the product, simultaneously relieves the working heat problem of the wire frame coil, prolongs the overall service life of the motor, effectively eliminates the working noise generated by the collision and resonance of the parts, and realizes the stable operation of the motor with low vibration and low noise.

System and method for sensorless control of an induction motor are disclosed. A flux observer estimates a rotor flux based on stator voltage and current measurement. A low frequency signal injection module generates a flux estimation error signal at low motor speed, while a baseline observer generates a model based flux estimation error signal at medium to high motor speed. A switching mechanism selects between these error signal based on motor condition. A proportional integral regulator and integrator process the selected error signal to estimate rotor speed. A lead compensator adjusts phase during transitions to ensure stability, with a switching signal generator activating the LFSI module when stator frequency falls below a predefined threshold. This control system provides rotor flux and speed estimation across a full range of motor speed by adaptively switching between observers based on operating conditions.

Disclosed are a method for controlling an induction motor, a device, an equipment and a storage medium. The method includes: determining an optimal starting frequency by acquiring initial equivalent circuit parameters of the induction motor at zero speed, and determining a starting voltage by a preset starting current, so as to enable the induction motor to enter a starting operation phase; then determining that the induction motor switches from the starting operation phase to the steady operation phase when it is determined that the motor starting speed of the induction motor in the starting operation phase is accelerated to be consistent with a preset steady operation speed; and using the optimal frequency with the updated equivalent parameters identified with the operation current and voltage values, and adjusting the drive voltage to maintain the motor speed to the required one.

The invention relates to an induction motor rotor which comprises a rotating shaft, a rotor iron core arranged on the rotating shaft in a sleeving mode and end rings used for fixing the rotor iron core, and each end ring is provided with a center hole for the rotating shaft to pass through. An inner heat dissipation blade ring and an outer heat dissipation blade ring arranged around the inner heat dissipation blade ring are integrally arranged on the side, away from the rotor iron core, of the end ring, the inner heat dissipation blade ring comprises a plurality of inner heat dissipation blade units annularly arranged around a center hole of the end ring at intervals, and the outer heat dissipation blade ring comprises a plurality of outer heat dissipation blade units annularly arranged at intervals. The inner heat dissipation blade units are configured to have a first flow guide direction for guiding airflow to the center hole area of the end ring relative to the rotation direction of the rotor, and the outer heat dissipation blade units are configured to have a second flow guide direction for guiding airflow to the peripheral area of the end ring relative to the rotation direction of the rotor. The invention also relates to an induction motor with the rotor.

This utility model relates to the field of three-phase induction motors, and more particularly to a heat dissipation assembly for a three-phase induction motor. It includes a connecting base, a motor body mounted on its upper end, a junction box mounted on the upper surface of the motor body, and a drive shaft mounted on the output end of the motor body. A heat dissipation structure is provided on the side of the connecting base away from the drive shaft. The heat dissipation structure includes a connecting ring, which is fixedly connected to the motor body. The inner wall of the connecting ring has several holes. A housing is slidably connected to the arc surface of the connecting ring. Several connecting rods are fixedly connected to the inner wall of the housing, and the connecting rods are slidably connected to the holes. The heat dissipation assembly for a three-phase induction motor provided by this utility model has the advantages of easily improving the heat dissipation efficiency inside the motor, not only improving the motor's heat dissipation efficiency but also reducing the motor's aging rate.

The invention belongs to the technical field of motors, and provides a solid rotor structure and an induction motor, the solid rotor structure comprises a rotating shaft and a rotor connected to the rotating shaft, the rotor is a conductive magnetizer, the rotor is provided with two spaced or connected slot groups along the axial direction, the slot groups comprise at least two spaced or connected slot groups, and the slot groups are arranged on the rotating shaft. The groove group comprises a plurality of grooves which are distributed along the axial direction of the rotor at equal intervals; in each groove group, the adjacent groove groups are staggered by a first angle along the first rotation direction of the rotor; and in the middle of the rotor, two adjacent groove groups which are respectively positioned in different groove groups are staggered by a second angle along the first rotating direction of the rotor.

A drive system (10) for an induction motor (200), comprising: a drive unit (12) coupled with the induction motor (200); and a control unit (11). The control unit (11) is configured to control the drive unit (12) to provide a first magnetization current to the induction motor (200) in response to a trigger signal such that the drive unit (12) is operated for magnetization of the induction motor (200) during a first time period. The control unit (11) is further configured to control the drive unit (12) to provide a torque current to the induction machine (200) such that the drive unit (12) is operated for acceleration of the induction machine (200) during a second time period following the first time period.

A machine tool control device according to one aspect of the present invention, with which a machine tool driving a main shaft by means of an induction motor is controlled according to a machining program, is equipped with: a load estimation unit which, by pre-calling the machining program, estimates whether the load state of the main shaft is idling operation without any load induced by the machining or actual operation including a load induced by the machining; and a current control unit which controls a d-axis current and a q-axis current of the main shaft currents supplied to the induction motor such that the speed of the main shaft corresponds to a speed according to the machining program, and which sets the d-axis current to a higher value when the load state is estimated to be actual operation than when the load state is estimated to be idling operation.

The invention provides a double-winding induction motor power generation system output voltage balance control method and system, aims to solve the problems of low output voltage balance degree and the like caused by uncertain and asymmetrical load disturbance of an aircraft variable-frequency alternating-current power generation system, and belongs to the technical field of variable-frequency alternating-current power generation. According to the invention, active suppression of the imbalance of the output voltage is realized, and the power supply quality is improved. The method can estimate and compensate the unbalanced voltage of the power winding side in real time, thereby effectively suppressing the unbalance degree of the output voltage, ensuring the symmetry and stability of the three-phase voltage, improving the electric energy quality of a double-winding induction motor power generation system, decomposing the three-phase asymmetric voltage into a positive sequence component and a negative sequence component, and improving the reliability of the double-winding induction motor power generation system. The negative sequence component in the power winding side voltage is accurately separated in real time through the orthogonal signal acquirer, and the unbalance degree of the voltage is judged according to the magnitude of the negative sequence voltage. The power supply can be applied to independent power supply application occasions such as airplanes and ships, and is high in universality.