Abstract: A device for detecting a slot wedge, an air gap and a broken rotor bar is provided, where a sequential circuit generates double concurrent pulses; the sequential circuit is connected to driving power modules; the driving power modules are connected to front-end interface circuits; the front-end interface circuits convert the double concurrent pulses into corresponding magnetic-field pulses; the magnetic-field pulses are transmitted to power supply terminals on adjacent phases of stator windings through impedance matching pins and coupled at a corresponding coil, air gap and squirrel cage rotor to generate single groups of cyclic rotating magnetic potentials; single rotating magnetic potentials are sequentially generated in adjacent slots on each of the phases of the stator windings; rotating electric potentials in magnetic circuits with two symmetrical phases are magnetically coupled to form distributed coupling magnetic field reflected full-cycle waves for reflecting a difference of a corresponding slot wedg

Abstract: The disclosure relates to a compact design method for inductive filtering transformer. According to the disclosure, the inductive filtering transformer adopts an approximative zero-impedance design under the premise of satisfying the filtering performance. The direct optimization objective is to minimize the distance from the transformer core center to the outermost winding. This disclosure balances the constraint of winding impedance matching and transformer size optimization and satisfies the application of limited installation space.

Abstract: The invention provides a wind power forecasting method and system based on an asymmetric Laplace distribution. It utilizes the asymmetric Laplace distribution to model the uncertainty of the power forecasts. First, the maximum information coefficient (MIC) is used to characterize the linear and nonlinear relationship between the target and historical power data to select reasonable and optimal inputs. Then, to avoid the information loss, a multi-scale feature fusion module is proposed which combines the features obtained from different convolutional layers of a convolutional neural network (CNN), thereby further enhancing the feature extraction ability of the traditional CNN. Finally, a BiLSTM is used to extract temporal information and forecast the parameters of asymmetric Laplace distribution.

Abstract: The disclosure relates to a compact design method for inductive filtering transformer. According to the disclosure, the inductive filtering transformer adopts an approximative zero-impedance design under the premise of satisfying the filtering performance. The direct optimization objective is to minimize the distance from the transformer core center to the outermost winding. This disclosure balances the constraint of winding impedance matching and transformer size optimization and satisfies the application of limited installation space.

Abstract: A damping return hammer includes a grip handle, a first elastic damping arm, a second elastic damping arm, and a hammer head provided at the fronts of the first elastic damping arm and the second elastic damping arm, respectively. The front ends of the first elastic damping arm and the second elastic damping arm are upper and lower respectively, and extend at a certain distance forward and are in the same longitudinal section. The two hammer heads are provided at the front ends of the first elastic damping arm and the second elastic damping arm respectively. A gap is between the two hammer heads and is fitted therein with a rubber energy-storage cushion block.

Abstract: The disclosure discloses a virtual impedance comprehensive control method for an inductive power filtering (IPF) system. According to the disclosure, harmonic damping control at grid side and zero impedance control of filters are organically combined according to a technical problem which is unsolved and process difficulty in equipment manufacturing in an existing filtering method, so that the problem of performance reduction of passive filtering equipment caused by a change in an impedance parameter of a power grid system is solved on one hand, optimization control over a quality factor of the passive filtering equipment may be implemented to reduce dependence on an equipment production process level on the other hand, a quality factor of the single-tuned filters may meet a design requirement, and an overall filtering characteristic is further improved.

Abstract: A damping return hammer includes a grip handle, a first elastic damping arm, a second elastic damping arm, and a hammer head provided at the fronts of the first elastic damping arm and the second elastic damping arm, respectively. The front ends of the first elastic damping arm and the second elastic damping arm are upper and lower respectively, and extend at a certain distance forward and are in the same longitudinal section. The two hammer heads are provided at the front ends of the first elastic damping arm and the second elastic damping arm respectively. A gap is between the two hammer heads and is fitted therein with a rubber energy-storage cushion block.

Abstract: Breathing glasses for purifying air include left and right air filters, an air transmission pipe at the left and right sides thereof, an air curtain ejection and air transmission device and an eye protection cover. The left and the right air filters include a filter casing, a composite filter layer, a built-in air inductor, an intelligent induction chip, a dual-channel variable-frequency turbofan and a miniature motor, a battery and a power control switch, and a lower air transmission transformation connection port. The air curtain ejection and air transmission device ejects air through an upper air curtain outlet groove, a lower air curtain air outlet groove and two breathing air transmission holes to form an air curtain isolation layer to block surrounding unclean air, clean air is ejected from the two breathing air transmission holes. A long-time wearing mode is provided when a portable external air filter is included.

Abstract: A joint structure includes a first floorboard and a second floorboard. The first floorboard and the second floorboard each includes: a top surface; a bottom surface; a first side surface; a second side surface; a third side surface; a fourth side surface; a first beveled tenon, the first beveled tenon including a first tenon face facing upwards; a first beveled mortise, the first beveled mortise including a first mortise face facing upwards; a second beveled tenon, the second beveled tenon including a second tenon face facing downwards; and a second beveled mortise, the second beveled mortise including a second mortise face facing downwards. The top surface is disposed substantially parallel to the bottom surface. The first side surface, the second side surface, the third side surface, and the fourth side surface are disposed substantially perpendicular to the bottom surface.

Abstract: The disclosure discloses a virtual impedance comprehensive control method for an inductive power filtering (IPF) system. According to the disclosure, harmonic damping control at grid side and zero impedance control of filters are organically combined according to a technical problem which is unsolved and process difficulty in equipment manufacturing in an existing filtering method, so that the problem of performance reduction of passive filtering equipment caused by a change in an impedance parameter of a power grid system is solved on one hand, optimization control over a quality factor of the passive filtering equipment may be implemented to reduce dependence on an equipment production process level on the other hand, a quality factor of the single-tuned filters may meet a design requirement, and an overall filtering characteristic is further improved.

Abstract: A joint structure includes a first floorboard and a second floorboard. The first floorboard and the second floorboard each includes: a top surface; a bottom surface; a first side surface; a second side surface; a third side surface; a fourth side surface; a first beveled tenon, the first beveled tenon including a first tenon face facing upwards; a first beveled mortise, the first beveled mortise including a first mortise face facing upwards; a second beveled tenon, the second beveled tenon including a second tenon face facing downwards; and a second beveled mortise, the second beveled mortise including a second mortise face facing downwards. The top surface is disposed substantially parallel to the bottom surface. The first side surface, the second side surface, the third side surface, and the fourth side surface are disposed substantially perpendicular to the bottom surface.

Abstract: A joint structure for a floorboard, including: at least one first beveled tenon, the first beveled tenon including a tenon face facing upwards; a first beveled mortise, the first beveled mortise including a mortise face facing upwards; at least one second beveled tenon, the second beveled tenon including a tenon face facing downwards; and a second beveled mortise, the second beveled mortise including a mortise face facing downwards. The first beveled tenon is disposed in parallel to a surface of the floorboard at a right edge approximately half a height of the floorboard; the first beveled mortise is disposed at an inner side of the first beveled tenon. The second beveled tenon is disposed at a left edge approximately half the height of the floorboard. The second beveled mortise is disposed at an inner side of the second beveled tenon.

Abstract: A joint structure for a floorboard, including: at least one first beveled tenon, the first beveled tenon including a tenon face facing upwards; a first beveled mortise, the first beveled mortise including a mortise face facing upwards; at least one second beveled tenon, the second beveled tenon including a tenon face facing downwards; and a second beveled mortise, the second beveled mortise including a mortise face facing downwards. The first beveled tenon is disposed in parallel to a surface of the floorboard at a right edge approximately half a height of the floorboard; the first beveled mortise is disposed at an inner side of the first beveled tenon. The second beveled tenon is disposed at a left edge approximately half the height of the floorboard. The second beveled mortise is disposed at an inner side of the second beveled tenon.