12 results about "Induction motor" patented technology

The utility model belongs to the technical field of single -phase operation asynchronous motor for household electrical appliances such as electric fan, range hood, air purifier, bathroom heater, etc. including the motor casing that is combined by front end cover and rear end cover, its inside is hollow structure, stator subassembly, its fixed mounting is in the motor casing inside, and stator subassembly includes stator core, and the upper end, lower end of stator core is equipped with insulation frame respectively, and the upper surface of one side of insulation frame is provided with containing groove, and the top of containing groove is fixedly installed with welding platform, and the insertion needle is inserted in the top of insulation frame, and the inside of stator core is wound with aluminium wire and the head is welded with the one side of insertion needle on the upper surface of welding platform, the utility model puts forward a kind of inner winding type's iron shell alternating current aluminium wire motor structure, and power cord is welded together through PCB board and insertion needle, so that the overall structure of stator subassembly is simple, and most processes can be assembled by automatic equipment, so that multiple manual assembly processes are saved, and labor cost is reduced.

A cryopump assembly, including a centrifugal pump and an induction motor, specially configured for delivery of liquid hydrogen (LH2) from a cryogenic LH2 tank to various application scenarios, has a horizontal configuration and includes an offset discharge port to prevent the occurrence of gas blockage phenomena. A one-piece vacuum jacket housing may be employed to enclose various portions of the centrifugal pump and the induction motor to prevent heat loss, while another embodiment is to lubricate the bearings and cool the induction motor with LH2 flow through the induction motor. The centrifugal pump can be of a single-stage type or a multi-stage type, and each stage unit comprises an impeller and a guide vane connected with a guide vane shell. The pump shares one motor / pump shaft with the motor. Another embodiment is that the cryopump assembly is vertically submerged in a cryogenic LH2 tank, or vertically submerged in a sump vessel secured to the exterior or interior of the cryogenic LH2 tank.

The utility model discloses an industrial type explosion -proof dust collector, wherein, including: dust collection bucket is installed in the moving trolley, and filter bucket is installed in dust collection bucket, and dust collection bucket and filter bucket intercommunication setting, the lateral wall of dust collection bucket installs dust collection pipe interface, the box body is installed in the moving trolley, and the box body is connected with filter bucket through the pipeline, and the inside installation explosion -proof three -phase asynchronous motor of box body, the outer wall of box body installs explosion -proof electromagnetic starter, and explosion -proof electromagnetic starter and explosion -proof three -phase asynchronous motor signal connection. The device dust collection bucket and filter bucket upper and lower bucket separate setting, when dumping garbage, directly dumping filter bucket can, can quickly dump, convenient to use, when needing to move this device, directly through moving trolley can move, and move nimblely, and the modular structure of this device is convenient for maintenance and replacement parts.

This invention provides a positioning and braking method for a sensorless motor used in height adjustment and a height-adjustable table, relating to the field of motor control technology. The method includes: Step S1, before the sensorless motor reaches the target height, applying direct current to the stator winding of the sensorless motor to compensate the electrical angle of the sensorless motor to a preset value; Step S2, controlling the electrical angle of the sensorless motor to maintain the preset value until it finally stabilizes and stops at the target height. The beneficial effects are: by applying direct current to the stator winding, a static magnetic field is formed, achieving a braking and stopping effect, ensuring the elimination of the sensorless motor's sliding phenomenon during height adjustment; by first compensating the electrical angle of the sensorless motor and then maintaining it to achieve segmented braking, rapid and reliable braking is achieved; simultaneously, by compensating the electrical angle of the sensorless motor, static sliding caused by power outages due to structural clearances such as worm gears is effectively eliminated.

The application relates to the technical field of high-voltage motors, in particular to a flame-proof high-voltage three-phase asynchronous motor, which comprises a motor shell and a rear shell, a stator, a stator winding, a rotor and a rotor winding are arranged in the motor shell, and a fan blade for blowing air is arranged in the rear shell; the rear shell is fixedly arranged at the rear side of the motor shell; a circulating cooling assembly is arranged for cooling the motor shell; the circulating cooling assembly utilizes the characteristics of a vortex tube that separates cold air flow and hot air flow, uses low-temperature gas to perform circulating cooling on the motor shell, better cooling effect is obtained, a closed outer circulation is formed outside the motor shell, the possibility of external sundries entering the motor is reduced, and the frequency of explosion is reduced to a certain extent.

1. Name of the product in this design: Asynchronous motor (for wind power yaw system). 2. Purpose of this design: For use in the yaw system equipment of offshore wind turbines. 3. The key design feature of this product is its shape. 4. The image or photograph that best illustrates the design's key points: a 3D model.

The invention relates to a method for detecting broken bars of a squirrel cage of an induction motor, the method comprising: - determining (40) a signal representative of a current flowing through at least one stator winding, - calculating (44) a Fourier transform of the determined signal, - determining (46) a fundamental frequency of the Fourier transform of the determined signal, - calculating (50) an estimated rotor slip from an alternating voltage applied to the stator winding and the signal representative of the current flowing through the stator winding, - setting (52) a search window from the estimated rotor slip and the fundamental frequency, - searching (54) for a first peak and a second peak in the search window, - checking (56, 58, 62) whether the frequencies and / or amplitudes of the first peak and the second peak satisfy at least one defined condition; if at least one condition is satisfied, generating a signal indicating that at least one broken bar is present.

This invention discloses a coupling device for an AC asynchronous servo motor used in wind power pitch control, relating to the field of wind power generation. It includes an asynchronous motor, with a main coupling fixedly connected to the output end of the asynchronous motor. The outer surface of the main coupling is respectively provided with guide components and adjusting components. One end of the main coupling is fixedly connected to a connecting plate, and the outer surface of the connecting plate has a guide groove. This invention utilizes the guide groove on the outer surface of the connecting plate in cooperation with a sliding rod, allowing two arc-shaped plates to slide flexibly along the guide groove. When dealing with AC asynchronous servo motor output shafts and pitch control input shafts of different sizes, the positions of each component can be finely adjusted according to the actual size of the shaft, adjusting the position of the arc-shaped plates in the guide groove. Then, a locking pin passes through a perforated block and a perforated square plate for fixation. For motors with larger output shaft diameters, the arc-shaped plates are slid outwards to accommodate the installation requirements of larger shafts.

This utility model discloses an electrically heated drying oven with controllable airflow, including a box shell, a protective shell fixedly installed inside the box shell, and a drying chamber welded to the inner wall of the protective shell. A cavity is provided between the drying chamber and the protective shell, and an air inlet slot is opened in the middle inner wall of the drying chamber. A fan blade is rotatably installed on one side of the air inlet slot inside the cavity, and the fan blade is connected to a shaded-pole asynchronous motor through a rotating shaft. Electric heating rods distributed in a triangular pattern are installed on the side of the fan blade. This utility model effectively distributes the flowing hot air equally by setting equally spaced C-shaped baffles inside the cavity between the protective shell and the drying chamber, thereby connecting it to the rectangular exhaust holes on both sides. This ensures that the amount and temperature of the gas flowing on both sides of the drying chamber are similar, thus avoiding the difference in drying degree of items of different heights inside the drying chamber.

The invention relates to a system for reverse osmosis (RO) and pressure retarded osmosis (PRO), the system comprising: a RO subsystem having a high pressure RO compartment and a low pressure RO compartment separated by a RO membrane, the high pressure RO compartment having a RO feed inlet and a brine outlet, and the low pressure RO compartment having a permeate outlet; a PRO subsystem having a high pressure PRO compartment and a low pressure PRO compartment separated by a PRO membrane, the high pressure PRO compartment having a draw inlet and a draw outlet, and the low pressure PRO compartment having a PRO feed inlet and a PRO feed outlet; an induction motor having a stator and a rotor, wherein the rotor is mechanically connected to an input shaft of a hydraulic pump and to an output shaft of a hydraulic motor, the hydraulic pump being configured for providing a feed solution to the RO feed inlet, the hydraulic motor being configured for receiving a draw solution from the draw outlet. The invention also relates to a method for operating such a RO / PRO system and to a use of such a system.

This invention discloses a speed adaptive fault-tolerant tracking control method for a three-phase synchronous induction motor, comprising: establishing a state-space model affected by lumped disturbances and measurement equations including unknown speed sensor faults; designing an adaptive fault compensation estimator, by embedding adaptive compensation terms into the feedback channel of the estimator to achieve joint estimation of system state, disturbances, and sensor faults; constructing a generalized intermittent state constraint method; and constructing a sensor fault-tolerant tracking controller based on the reconstructed speed state and disturbance estimates, as well as the generalized barrier Lyapunov function, enabling the system to accurately track a given speed command even when the speed sensor fails. This invention requires no additional hardware redundancy, effectively suppresses the impact of speed sensor faults on control performance, and has advantages such as simple structure, strong robustness, and high engineering feasibility. It is suitable for high-reliability drive control of continuous wave mud pulse generators in measurement-while-drilling instruments.