MotorThere are many protectors, the following is a brief introduction to the different types of our common ones by the motor control management staff: (1) Electronic type: the three-phase current value of the detection system, the setting current value adopts a potentiometer or a code switch, and the circuit design The general enterprise adopts the analog type and adopts the characteristics of inverse time or definite working environment.Frequency conversion speed motorA general term for motors driven by frequency converters.In fact, the motor designed for the frequency converter is a special frequency conversion motor. The motor can achieve different speeds and torques under the drive of the frequency converter to adapt to the changes in the demand of the load.Explosion-proof motorsA type of motor that can be used in flammable and explosive plants, and does not generate sparks during operation.Explosion-proof motors are mainly used in coal mines, oil and gas, petrochemical and chemical industries.In addition, it is also widely used in sectors such as textiles, metallurgy, city gas, transportation, grain and oil processing, papermaking, and medicine.The motor is an electromagnetic device that realizes the conversion or transmission of electric energy according to the law of electromagnetic induction.The analysis of ecological protection functions includes information overload, phase loss, locked rotor, etc. The fault data type research adopts indicator light, and the running power adopts digital tube display. (2) Thermal relay: ordinary small-capacity AC motors, with good working and living conditions, and no problems with frequent starting and other severe working conditions; due to poor economic accuracy, reliability cannot be guaranteed, and students are not recommended to use it. (3) Intelligent type: detects the three-phase current value, and the protector uses a single-chip microcomputer to realize the comprehensive cultural protection of the intelligent development of China's motor, integrating protection, measurement, communication and display.The setting current calculation adopts the traditional digital model setting, and operates through the practical operation panel buttons. The user can directly modify the settings of various related parameters on the spot according to the actual implementation of the actual motor company; use the digital tube as the survey display time window, or The large-screen LCD display can support various teaching communication network protocols, and the price level is relatively high. It is used for more important applications; high-voltage motor protection adopts intelligent protection devices. (4) Thermal protection type: Embedded thermal components in the motor, and effective protection according to the temperature requirements of the motor windings, and the protection effect is good; but when the motor capacity is large, it needs to be used with the current monitoring type to avoid motor blockage. When the temperature rises sharply during rotation, the motor windings are damaged due to the hysteresis of the temperature measuring element. (5) Magnetic field temperature increase detection type: embedded magnetic field detection coils and temperature measuring elements in the motor, and self-protection according to the change of the rotating magnetic field and the temperature change process in the motor industry. The main service function requirements include overload, locked rotor, and lack of Phase, overheating protection and wear monitoring, and the protection of social functions are constantly improving. The disadvantage is that a magnetic field detection coil and a temperature sensor need to be installed inside the motor.