Stepper motors are often used for positioning control . It can control the angle of rotation (relatively speaking, distance) by the number of pulses output by the PLC , and the frequency of the pulses controls the rotation speed of the stepper motor. However, it is simple, economical and convenient to use in occasions where the control accuracy is not very high;…
Hydrogen chloride, with the chemical formula HCl, is a colorless gas with a pungent odor. A hydrogen chloride molecule is composed of one chlorine atom and one hydrogen atom. Its aqueous solution is called hydrochloric acid, also known as hydrochloric acid. Hydrogen chloride is very soluble in water. At 0°C, 1 volume of water can dissolve approximately…
With the development of biotechnology, cell culture has become an indispensable process in order to study cell signal transduction, anabolism, growth and value-added, etc. Cell culture refers to a method of simulating the internal environment (sterility, suitable temperature , pH and certain nutritional conditions, etc.) in vitro to enable it to survive, grow, reproduce and…
Nowadays, the environmental situation is grim, the environmental supervision and law enforcement tasks are becoming more and more onerous, and the depth and difficulty are also increasing. The supervision model is relatively simple, and the traditional environmental protection law enforcement methods can no longer meet the needs of the current environmental supervision work. The application…
Large power consumption, unstable voltage , As a result, the air conditioner is automatically turned off, and other electrical equipment is also affected. So is there any way to solve this headache? The editor recommends installing a voltage regulator. What is the working principle and function of the voltage regulator? We together look! Introduction A…
We know that protective grounding and protective zero connection are both for the protection of personal safety and equipment safety, and they are set for the same purpose. In terms of these two security protections, the protection of human life is the most important. Since they are all for the protection of people’s safety, why…
The diet of modern people tends to include more and more convenience foods such as fast food and takeaway. These foods contain a lot of fat, salt and additives, which are harmful to human health. Cooking by yourself can control the quality and health of ingredients, such as choosing fresh vegetables, fruits, meat, etc., and…
1. Insulation resistance measurement of cable main insulation 1.1 test purpose Initially judge whether the main insulation is damp and aging, and check whether there are defects in the cable main insulation after the withstand voltage test. The decrease of insulation resistance indicates that the insulation is affected with damp or aged or deteriorated, which…
At present, electric vehicle motor controllers mostly use three-phase full-bridge voltage -type inverter circuit topology, and some products are pre-mounted with bidirectional DC/DC converters to increase the input AC voltage at the motor end , increase the output power at high speeds , and reduce motor design and production costs. The DC support capacitors in…
The vibration sensor is a widely used alarm detection sensor. It senses the parameters of mechanical motion vibration (such as vibration speed, frequency, acceleration, etc.) through the internal piezoelectric ceramic sheet and spring weight structure and converts it into an available output signal. Then it is amplified by an operational amplifier such as LM358 and outputs a…