Overview and application of variable-frequency explosion-proof motor

Overview of variable frequency explosion-proof motors

Variable-frequency explosion-proof motor is also called flameproof variable-frequency speed regulating three-phase asynchronous motor. YBBP series variable-frequency explosion-proof motor is a new explosion-proof motor product developed and developed by Nanyang explosion-proof Motor Co., Ltd. according to the current market demand. The explosion-proof motor used in combination with the inverter can smooth and stepless speed regulation in a wide range. Speed range, speed accuracy, dynamic response, power factor, low frequency torque, slip compensation, efficiency and other aspects have great advantages, is to meet the petroleum, chemical, coal and other explosive gas mixture motor explosion-proof in line with GB3836.1 and GB3836.2 provisions. Ordinary explosion-proof motors can be used for frequency converters, but the frequency cannot be too low during operation, generally running above 30HZ. The cooling fan of the ordinary motor and the motor are coaxial, and the cooling effect becomes worse after the speed is reduced, and the inverter output has harmonics, which will increase the heat of the motor, so it can not run at a low frequency. The difference between frequency conversion explosion-proof motor and ordinary motor is mainly: first, cooling, frequency conversion explosion-proof motor has a special independent cooling fan; Second, the insulation of the inverter motor is stronger than that of the ordinary motor, mainly to prevent harmonic damage.

Use of variable frequency explosion-proof motor

Frequency conversion explosion-proof motor is generally used in petroleum factories, chemical plants and other flammable and explosive mixtures, because its explosion-proof function can play freely in these places, automatically adjust the frequency, the slip can also be compensated accordingly, there will be no speed gap problem, the precision of speed regulation is also superior to other explosion-proof motors. Low-frequency operation work is necessary in some occasions, these functions and characteristics are other explosion-proof motors can not be replaced and replaced, so frequency conversion explosion-proof motors play an irreplaceable role in some special occasions.

1. For constant power variable frequency motor, when the speed exceeds 3000r/min, special grease with high temperature resistance should be used to compensate for the temperature rise of the bearing.

2. For the vibration and noise problems of the motor, the rigidity of the motor components and the whole should be fully considered, and the natural frequency should be increased as much as possible to avoid resonance with each force wave.

3. Insulation level, generally F or higher, strengthen the insulation to the ground and turn insulation strength, especially considering the ability of insulation to withstand impulse voltage.

4. Cooling method: forced ventilation cooling is generally used, that is, the main motor cooling fan is driven by an independent motor.

5. To prevent shaft current measures, bearing insulation measures should be adopted for motors with capacity exceeding 160KW. It is mainly easy to produce magnetic circuit asymmetry, but also produce shaft current, when the current generated by other high-frequency components together, the shaft current will be greatly increased, resulting in bearing damage, so generally to take insulation measures.