3results about How to "Realize simple structure" patented technology

The invention discloses an infrared bipolar linearly-polarized photoelectric detector and a preparation method thereof, and the infrared bipolar linearly-polarized photoelectric detector is characterized in that a bipolar material graphene is used as a channel material, a two-dimensional N-type semiconductor material molybdenum disulfide MoS2 and an anisotropic narrow-band-gap two-dimensional material black phosphorus BP are stacked on the bipolar material graphene in sequence, and the two-dimensional N-type semiconductor material molybdenum disulfide MoS2 and the anisotropic narrow-band-gap two-dimensional material black phosphorus BP are stacked on the channel material; the polarity of the graphene is regulated and controlled by the bottom gate, the infrared bipolar linearly polarized photoelectric detector with the bipolar linear polarization detection effect that the light current symbol reversibly turns over along with the polarization direction in the infrared band is achieved, and the infrared bipolar linearly polarized photoelectric detector has the advantages of being simple in structure, easy to regulate and control, capable of remarkably improving polarization recognition precision and the signal-to-noise ratio and the like. The programmable and multifunctional integration potential is also realized.

This invention discloses an improved sliding mode observer for permanent magnet synchronous motor control and a system relating to the field of motor control technology. Addressing the problems of severe chattering and low estimation accuracy in traditional sliding mode observers, the method includes: acquiring the motor voltage and current and transforming them to a stationary coordinate system; using an adaptive sliding mode observer integrating a fuzzy adaptive adjustment unit and a smoothing switching unit for state observation, outputting a smoothed back EMF estimation signal, wherein the fuzzy adjustment unit dynamically adjusts the sliding mode gain based on the current error, and the smoothing switching unit generates a continuous control signal to suppress chattering; inputting the smoothed back EMF signal into a phase-locked loop (PLL) unit to synchronously extract rotor position angle and speed estimates for closed-loop control. The system includes signal detection, an adaptive sliding mode observer, a PLL, and a closed-loop control module. This invention improves the accuracy of speed and position observation and system stability by synergistically suppressing chattering through fuzzy adaptive and smoothing switching, and by avoiding phase delay through a PLL.

The 2AMT speed change assembly is characterized in that a main shaft is sleeved with a spline housing, a first-gear transmission gear and a second-gear transmission gear which are located on the two sides of the spline housing are both movably arranged on the main shaft in a sleeving mode, the first-gear transmission gear and the second-gear transmission gear are fixedly sleeved with a first-gear sleeve and a second-gear sleeve respectively, and a sliding sleeve is arranged on the spline housing in a sleeving mode; the outer spline of the spline sleeve is in key connection with the inner spline of the sliding sleeve, and when the sliding sleeve axially slides on the spline sleeve, the inner spline of the sliding sleeve can be in key connection with the first gear connecting key of the first gear sleeve or the second gear connecting key of the second gear sleeve. The 2AMT speed change assembly is simple in structure and convenient to switch and has a gear locking function.