The difference between explosion-proof motors and ordinary motors

09/11/2019

1. Explosion-proof motor adopts brushless excitation, set rotary rectification disc and static excitation cabinet, the excitation control system is reliable; the ac-polarity is poorly excited and has no impact; the excitation system is out of step protection and reliable, and the whole step ability is strong; the circuit design Reasonable, the discharge resistance does not generate heat during operation; the excitation current adjustment range is wide;

2. Synchronous machine, AC exciter and rotating rectification coil are coaxial. The rectifier disk is located between the main motor and the exciter or placed outside the bearing housing;

3, to meet the requirements of increased safety explosion-proof motors, a series of reliable measures to prevent sparks, arcs and dangerous high temperatures, can be safely operated in the explosion danger zone of Zone 2;

4. The protection level of the explosion-proof motor housing is IP55;

5, explosion-proof motor uses F-class insulation, temperature rise according to B-level assessment, ordinary motor is not up to this requirement;

6. The explosion-proof motor changes the traditional water cooling to the upper water cooling, that is, the water cooler is placed on the upper part of the motor;

7. Set up an anti-moisture heater, which is fixed in the cover at the bottom of the motor and used for heating and moisture-proof during shutdown;

8, select high-quality raw materials, electrical and mechanical calculations leave a large margin, to meet the operational reliability and temperature requirements of increased safety motors;

9. The explosion-proof motor is equipped with perfect monitoring measures; the increased safety-type self-balancing current transformer for differential protection is installed in the main junction box; the stator winding is buried and the spare platinum thermal resistance is set, the graduation number is Pt100; The monitor monitors the leakage of the water cooler; the sliding bearings at both ends are respectively provided with an on-site temperature display instrument and a remote signal terminal;

10. The end cover of the explosion-proof motor adopts the grooved dark bolt, and the slot is 5 times deeper than the ordinary motor (the asbestos pad is required according to the requirement), mainly because the spark will not follow the gap if the internal winding is burned. Look outward;

11. In addition to the excellent sealing structure of the explosion-proof motor, the internal lead-out wire of the motor winding is also sealed to the terminal, and only three ends are usually drawn in order to reduce the sparking (usually 6 with connecting pieces);

12. The external power inlet of the explosion-proof motor junction box is extended by more than ten centimeters, movablely connected, and sealed at both ends with a sealed fire-resistant tubular threaded interface. It can be connected to the explosion-proof threaded steel pipe in a mobile and reliable manner, thus making the motor and input power All the lines meet the closed fire protection requirements;

13. The cooling fan at the end of the explosion-proof motor, in order to make the wind blade not rub the windshield, the outer edge of the wind blade is larger than the air guiding hood, and the wind blade is made of plastic;

14, of course, due to the special structure and material of the explosion-proof motor, the price of the explosion-proof motor will be much more expensive than the ordinary motor.