The motor is connected to the main shaft. The main shaft has an incremental rotary encoder. The encoder is known to be 1600 lines. The main shaft has a diameter of 150 mm. The main shaft is a variable speed rotation. The shaft that extends from the rear of the shift is also 150 mm with a turntable of 1M. What is the current speed of the spindle and the spindle? 2. What is the length of a pulse of the encoder? 3. When the length is 2000mm, how many pulses does the encoder output? If the known conditions listed are not sufficient, please assume known conditions. How to calculate? Please list the formula! The so-called mini projector is also called pico projector, TRT-Lcos Portable Projector. Mainly through the 3M LCOS RGB three-color projector and 720P film decoding technology, the traditional huge projector is refined, portable, miniaturized, entertaining and practical, making the projection technology closer to life and entertainment. best mini projectors under £100,mini projector pvo portable projector,mini projector portable,mini projector amazon,mini projectors for movies Shenzhen Happybate Trading Co.,LTD , https://www.szhappybateprojector.com
Answer: 1) This is the number of pulses that you need to record the spindle in unit time is the current speed of the motor. In fact, this does not require any calculation, you only need to read the number of pulses in OB35, such as OB35 set 1000ms, the number of pulses read is the motor speed (rpm / S). You multiply 60 by the usual unit of measure, which is rpm/min.
2) Since the encoder is directly connected to the motor output shaft, the motor rotates for 1 week and the actual encoder outputs 1600 pulses. Thus, when the motor rotates by 1 mm, the number of pulses of the encoder is the motor circumference / one-cycle pulse number. 150*3.14/1600=0.294375mm, that is, the motor drives the encoder to take 1 pulse, and the actual motor rotates 0.294375mm.
3) When the turntable rotates 2000mm, the actual number of pulses emitted by the encoder is 2000/0.294375=6794.
Usually the projector has certain regulations on 2 aspects:
a). Size: Usually the size is the size of a mobile phone.
b). Battery life: It is required to have at least 1-2 hours or more of battery life when it is not connected to power.
In addition, its general weight will not exceed 0.2Kg, and some do not even need fan cooling or ultra-small silent fan cooling. It can be carried with you (it can be put into your pocket), and the screen can be projected to 40-50 inches or more.
Advantage:
1. Completely replace the MP5 player, video, listening to songs, playing games, e-books, picture browsing, etc. MP5 video is affected by physical performance, the screen can not be bigger, and the screen of this thing is at least 20 inches.
2. Instead of the TV function, the machine can have a built-in CMMB function, or it can be directly connected to the set-top box to play the TV, and it can be used as a 21-inch TV during the day.
Look, it can be used as a 60-100-inch TV at night to achieve the effect of home theater; it is convenient to move and break through the traditional film and television space. Even if you are on the mountain, you can also share today's TV series, movies, and MTV with your lover.
3. Business office: instead of large projectors, it is used for company meetings; the price of large projectors is 4,000 to 14,000, and the lamp life is more than 1,000 hours, which is not convenient to carry. 30,000 hours, no need to change the bulb for 3 years, easy to carry, the salesman only needs to bring a micro projector to demonstrate the new product, which can achieve the demonstration effect.
4. Teaching: training meetings, classroom teaching; traditional projectors are not easy to carry. In school classrooms, due to the naughty students, projectors are not safe to place in the classroom and are easily damaged by students. The portability of micro projectors makes up for the teaching vacancies. In the future, teachers only need to store the materials in the projector and show them to students for teaching, saving the trouble of textbooks and handwriting with pens and chalks.
In addition, the micro-projection has no radiation, which can fully protect pregnant women and people with myopia. Its low power consumption function is 1/1,000,000 of the power consumption of color TVs. One day of electricity has completely impacted the indicators of safety, environmental protection, health, etc., and has made amazing contributions to future social development, standing at the peak of the green world as a leader.