VEIM XIAMEN MOTOR MACH CO.LTD Language：中文版
What is the difference between explosion-proof motors and ordinary motors?
Release time: 2023-03-07
Compared with ordinary motors, explosion-proof motors are mainly different in structure and materials. Explosion-proof fans have their unique characteristics.
(1) The explosion-proof motor adopts brushless excitation, and is equipped with a rotating rectifier disc and a static excitation cabinet. The excitation control system is reliable; the polarity slip is accurate, and there is no impact; the excitation system has reliable out-of-step protection and strong re-stepping ability; The design is reasonable, the discharge resistor does not heat up during work; the excitation current can be adjusted in a wide range;
(2) The synchronous machine, the AC exciter and the rotating rectifier are coaxial. The rectifier disc is located between the main motor and the exciter, or placed outside the bearing seat;
(3) Meet the requirements of increased safety explosion-proof motors, adopt a series of reliable measures to prevent sparks, arcs and dangerous high temperatures, and can safely operate in explosion-hazardous places in Zone 2;
(4) The protection grade of the explosion-proof motor shell is IP55;
(5) The explosion-proof motor adopts Class H insulation, and the temperature rise is assessed by Class F;
(6) The bearings at both ends are equipped with on-site temperature display instruments and remote signal terminals;
(7) Install an increased safety type moisture-proof heater, which is fixed in the cover at the bottom of the motor, and is used for heating and moisture-proof during shutdown;
(8) Select high-quality raw materials, and leave a large margin for electrical and mechanical calculations, which can meet the operational reliability and temperature requirements of increased safety motors;
(9) The explosion-proof motor is equipped with perfect monitoring measures; the main junction box is equipped with an increased safety self-balancing current transformer for differential protection; the stator winding is embedded with platinum thermal resistance for work and backup, and the graduation number is Pt100; Water leakage monitor to monitor the leakage of water cooler;
(10) Both sides of the explosion-proof motor cover use recessed bolts, and the slots are 5 times deeper than ordinary motors (asbestos pads are required as required). gap outwards;
(11) In addition to the junction box of the explosion-proof motor, the internal lead-out wire of the motor winding is also sealed and led to the terminal, and in order to reduce the generation of sparks, generally only three ends are led out (ordinary There are 6 pieces with connecting pieces).
(12) The external power inlet of the explosion-proof motor junction box is extended by more than ten centimeters, can be connected flexibly, and has airtight fire-resistant tubular threaded interfaces at both ends. The power cords all meet the requirements of closed fire protection;
(13) For the heat dissipation fan at the end of the explosion-proof motor, in order to prevent the blades from rubbing against the windshield, the outer edge of the blades is far away from the windshield, and the blades are made of plastic.
(14) Due to the special structure and material of explosion-proof motors, the price of explosion-proof motors will be much more expensive than ordinary motors.
(15) Explosion-proof motors are mainly used in flammable and explosive places, such as: flammable and explosive chemical plants, flour processing plants, wineries, oil field oil depots.
