4results about How to "Reduce distortion rate" patented technology

This invention discloses a video lens and an electronic device. The video lens has an object side and an image side arranged opposite to each other along the optical axis. The video lens includes a lens barrel and a lens group disposed within the lens barrel. The lens group includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a photosensitive chip arranged sequentially from the object side to the image side. The video lens satisfies the following condition: 0.1≤FA / TTL≤0.25, where FA is the optical focal length of the video lens, and TTL is the distance between the object side surface of the first lens and the imaging surface of the video lens on the optical axis. Through the reasonable arrangement of the five lenses, the optical focal length FA and the total optical length TTL of the optical system of the video lens satisfy the relationship: 0.1≤FA / TTL≤0.25, and the distortion rate reaches below 3%, so as to provide a video lens with small size, low distortion rate, and 4K high pixel resolution.

This invention discloses a grating galvanometer device and its control system and method. The grating galvanometer device includes: a grating galvanometer motor with a motor output shaft; a galvanometer clamp mounted on the end of the motor output shaft for clamping and fixing a laser reflector; a triangular chuck-type quick clamp with one end coaxially fixedly connected to the motor output shaft; a DD motor with a motor output shaft, the other end of which is rigidly connected to the quick clamp to allow the motor output shaft to rotate coaxially with the galvanometer; and a motor bracket for supporting the grating galvanometer motor and the DD motor. This invention uses real-time feedback data from the DD motor as a precision benchmark, enabling the acquisition, modeling, and iterative correction of short-cycle errors during the operation of the galvanometer motor. This solves the short-cycle error problem existing in low-resolution grating galvanometer motors, achieves real-time correction of the galvanometer motor's angle positioning error, improves the accuracy and consistency of laser processing, reduces equipment hardware costs, and enhances adaptability to various working conditions.

A kind of energy storage converter multi-machine parallel system stability analysis method, comprising: modeling and control of single PCS;Application of capacitor current feedback type active damping control strategy;Analysis of stability of single PCS under PI control;Mathematical modeling of multiple PCS parallel system;Establishment of parallel system norton equivalent circuit;Using logarithmic frequency characteristic curve, verify that active damping control can have better inhibitory effect on resonance peak of parallel system.Capacitor current feedback type active damping method can not only compensate resonance peak of parallel system, improve the stability of system, but also effectively reduce grid-connected current distortion rate, improve power quality.The stability analysis method for PCS multi-machine parallel system provided by the present application can be used for judging the operating state of parallel system, ensure the stable operation of system, and provide theoretical basis for parameter design of PCS controller.

The invention relates to the technical field of motors, in particular to a high-magnetism-gathering anti-saturation less rare earth permanent magnet and electromagnetic salient pole hybrid excitation motor which comprises a front end cover, a machine shell, a rear end cover, a rotating shaft, a stator and a rotor. The rotor is composed of a rotor iron core, neodymium iron boron permanent magnet steel, ferrite permanent magnet steel and an excitation winding, an even number of salient poles are uniformly distributed on the rotor iron core, arc-shaped contours are processed on two sides of a pole body of each salient pole to form a gourd-like excitation winding groove, the excitation winding is wound in the gourd-like excitation winding groove, and the excitation winding is wound in the excitation winding groove. Magnetic steel grooves for placing ferrite permanent magnet steel are formed in the outer sides of the gourd-like excitation winding grooves; and magnetic steel grooves for placing neodymium iron boron permanent magnet steel and arc-shaped magnetic isolation grooves are formed in the salient pole shoes. According to the invention, the magnetism gathering performance of the salient pole rotor can be effectively improved, the air gap flux density waveform can be improved, the distortion rate can be reduced, and the design of the gourd-like excitation winding grooves can effectively reduce the magnetic circuit saturation of the rotor and improve the torque performance of the motor.