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In the production process of coal mines, there are explosive substances such as gas and coal dust. In order to ensure safe production and prevent explosion accidents caused by gas and coal dust, on the one hand, the content of gas and coal dust in the air underground should be controlled; on the other hand, all ignition sources and high-temperature heat sources that can ignite gas and coal dust in mines should be eliminated.

The transformation enterprise is a top global printing enterprise in the Fortune 500. For the air conditioning cabinet at the end of the enterprise's central air conditioning, it uses high-efficiency intelligent permanent magnet direct-drive fans for energy-saving upgrades and transformations, and is equipped with intelligent digital control systems to enable enterprises to reduce emissions and increase efficiency.

Compared with small and medium-sized motors, high-voltage motors are expensive, and their application scenarios are critical and special. Whether it is the disposal of the motor body after a fault or other problems derived from the fault, it may be much more serious than we can imagine. For this reason, differential protection devices are used for high-voltage motors used in some special occasions, the purpose of which is to timely and effectively discover problems and prevent further deterioration of the problems.

Check whether the PT100 type sensor works satisfactory.
The PT100 sensor can be divided into 2 wires, 3 wires and 4 wires mode according to different application scenarios (as shown below). In this paper, a 3-wire PT100 sensor will be used to describe the checking procedure.

Electric motor products are widely used power equipment. According to the different application conditions of the motor, they are divided into different series of products, such as motors specially used in lifting metallurgy, textile, roller and other occasions with tendency requirements. According to the personalized requirements of the application conditions, the design and performance of the motor will tend to meet the requirements.

Inverter motors are motors that use inverter technology to control the speed of the motor. Inverter technology uses electronic equipment to control the speed of the motor, thus realizing the control of the motor's speed, power and efficiency.

Explosion-proof motors, as the main power equipment, are usually used to drive pumps, fans, compressors and other transmission machinery. Explosion-proof motor is the most basic type of explosion-proof motor, because of its shell non-sealed structure characteristics, the main flammable gas gas in the coal mine to reach a certain concentration limit.

Explosion-proof motors need to do a series of preparatory work before use, in order to ensure that explosion-proof motors in operation can maintain the normal state, this step is very critical, then we need to do those jobs before use?

Generation of magnetic fields
The first thing that is talked about is the generation of the magnetic field. In a high voltage motor, the magnetic field generated by current flowing through the windings interacts with the magnetic field generated by the permanent magnets or the applied current to form a torque that drives the motor to rotate. The essence of this interaction is the mutual attraction or repulsion between the magnetic field lines of force.

The coil insulation of high voltage motor has a great impact on the service life and economic effect of the motor, which is a problem that every designer and technician must carefully consider. The high-voltage coil can be called the heart of the motor to some extent, which directly determines the service life of the motor, and the performance of the insulating material, which is an important component of the coil, is crucial.