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2024
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02
What is the relationship between the protective structure of the motor and the way of ventilation and heat dissipation?
Different application environmental conditions determine the basic protective structure of the motor, and the choice of protective structure further frames the ventilation and heat dissipation structure of the motor. For example, the structure of explosion-proof motor, whether it is the ventilation and heat dissipation structure of the motor, or the selection and processing of parts and materials, is different from the motor used in ordinary environment. It is because the explosion-proof motor has special application conditions and runs in explosive mixed gas environment. If any kind of ignition explosive mixed gas occurs, if the surface temperature of the shell is too high, sparks generated by electrical faults in the shell are transmitted to the outside of the shell or collapse accidents crack the shell, serious personal safety accidents will inevitably occur.
Supercharged motors are the same as open motors. Ventilation and heat dissipation are mainly used for heat exchange in the form of air circulation, and heat dissipation on the surface of the shell is an auxiliary channel for heat transfer. When the structural motor is designed as an increased safety explosion-proof motor, the protection has two meanings: one is the usual sense of preventing solid particles and liquids, and the second meaning is explosion-proof. The way to realize explosion-proof is: air in the safe area is introduced into the air inlet through the pipeline, and the pressure difference between internal and external air is used to prevent explosive mixed gas from entering the inner cavity of the motor through the air outlet.
Supercharged motor is a special structure in open motor. It is impossible to prevent solid particles and liquid from being isolated, and only shielding and precipitation schemes can be adopted. When adding explosion-proof function, flame cannot be extinguished by explosion-proof parameters. The following measures should be taken to prevent explosion: strictly control the surface temperature of the heating body and keep away from the critical temperature of igniting explosive mixed gas; Using the pressure difference between the air inside and outside the shell, the interior of the shell to prevent explosive mixed gas from sparks due to electrical failure; Input safe cold air through the pipeline to blow the surface of the heating body; Equipped with a differential pressure switch, the motor feed system can only be opened when the air pressure in the motor cavity is higher than a certain level of the surrounding environment, and the wiring system cover can only be opened after sufficient time after shutdown.
The protection of the motor is closely related to ventilation and heat dissipation, and the realization methods and means directly determine the taste of the motor. The protection level of the supercharged structure motor can reach the level of the ordinary closed motor, but the efficiency of ventilation and heat dissipation is much higher, which is especially suitable for applications with high protection requirements and tight space. However, both the structural design and the manufacturing process are difficult, and any design or manufacturing defect will have a huge impact on the reliability, protection function and performance of the motor.
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