What is the difference between explosion-proof motor and ordinary motor?

First, the difference between explosion-proof motor and ordinary motor:

1. Explosion-proof motors are generally used in flammable and explosive environments.

2. The sealing of explosion-proof motor junction box is better than ordinary motor.

3 , explosion-proof motor protection level is the lowest IP55 , while ordinary motors have IP23 , IP44 , IP54 , IP55 , IP56 range, so can be distinguished from the appearance.

4. Increased safety type motor It is a motor structure that will not generate arc, spark or dangerous high temperature under normal operating conditions, and then take some mechanical, electrical and thermal protection measures to further avoid normal or recognized overload conditions. There is a danger of arcs, sparks or high temperatures underneath, thus ensuring its explosion-proof safety.

The basic series of low-voltage increased safety currently used in China is the YA series increased safety three-phase asynchronous motor, which is a derivative of the Y series (IP44) three-phase asynchronous motor. Explosion-proof performance in line with GB3836 . 1--83 "General requirements for explosive environment-proof electrical equipment" and GB3836. 3--83 "Electrical equipment for explosive atmospheres increased safety electrical equipment" E "" requirement; power range of O. 55~90kW , corresponding to the center height of the stand is 80 - 280mm ; explosion-proof signs are eIITl , eIIT2 , eIIT3 , which are applicable to the places where the temperature group Tl - T3 explosive mixture has slightly corrosive medium; The enclosure protection class is IP54 , the junction box protection class is IP55 , the rated frequency is 50Hz , and the rated voltage is 380V . The motor adopts class F insulation.

The main low-pressure model motor increased safety derived series are: YASO series of small power increased safety phase induction motor (base center height of 56 - 90mm), YA - W, YA - WFl series of outdoor, indoor corrosion increased safety three-phase asynchronous motors (- 280mm base center 80 is high).

two,

Explosion-proof motor according to the principle of explosion-proof can be divided into flameproof motor, increased safety motor, positive pressure motor, non-spark motor and dust explosion-proof motor.

1 . Flameproof motor

It uses a flameproof enclosure to isolate electrical components that may generate sparks, arcs, and dangerous temperatures from the surrounding explosive gas mixture. However, such enclosures are not sealed and the surrounding explosive gas mixture can enter the interior of the motor through the gaps in the joint portions of the enclosure. Explosion may occur when in contact with ignition sources such as sparks, arcs, dangerous high temperatures, etc. in the enclosure. In this case, the flameproof enclosure of the motor will not only not be damaged or deformed, but also the explosion flame or hot gas will be emitted through the gap of the joint surface. Nor can you ignite the explosive gas mixture around you.

Its main features are:

(1) The correspondence relation between power level, installation size, and rotation speed is consistent with DIN42673 , taking into consideration the continuity with the YB series and the interchangeability of the Y2 series, making necessary adjustments to be more effective and practical.

(2) The whole series adopts Class F insulation, and the temperature rise is assessed according to Class B.

(3) lower than the noise limits series YB, YB close series I-level noise, vibration limits and YB series quite.

(4) Shell protection rating increased to IP55 .

(5) Low-noise deep-groove ball bearings are used in the entire series, and the motor center is set at 180 mm or more for the oil discharge device.

(6) Motor cooling fins have parallel horizontal distribution and radiation distribution, mainly parallel horizontal distribution.

(7) The main performance indicators have reached the international advanced level in the early 1990s.

2. Increase safety motor

It is a motor structure that will not produce arcs, sparks, or dangerous high temperatures under normal operating conditions. It will then adopt mechanical, electrical, and thermal protection measures to further prevent arcing, sparks, or arcing under normal or recognized overload conditions. The danger of high temperatures ensures its explosion-proof safety. Its main features are:

(1) Satisfy the requirements of the increased safety explosion-proof motor and adopt a series of measures to reliably prevent sparks, arcs and dangerous high temperatures, and can safely operate in explosion hazardous locations in Zone 2 .

(2) Adopt brushless excitation, set the rotary rectifier plate and static excitation cabinet, the excitation control system is reliable; the polarity deviation and the excitation are accurate, no impact; the excitation system is out of step protection is reliable, and then the whole step ability is strong; the circuit design is reasonable The discharge resistor does not generate heat during operation; the excitation current regulation range is wide.

(3) Synchronous machine, AC exciter and rotating rectifier plate coaxial. The commutator disk is located between the main motor and the exciter, or outside the housing.

(4) The enclosure protection class is IP54 .

(5) The class F insulation, temperature rise class B assessment.

(6) Change the traditional water cooling to the upper water cooling, that is, the water cooler is placed on the upper part of the motor.

(7) An increased-safety type moisture-proof heater is fixed in the hood at the bottom of the motor and is used for heating and moisture-proof at the time of shutdown.

(8) Select high-quality raw materials, electrical and mechanical calculations to leave a larger margin, to meet the operating reliability and increased safety requirements of the temperature of the motor.

(9) Complete monitoring measures are provided; Increased-safety self-balancing current transformers for differential protection are installed in the main terminal box; Platinum thermal resistors for stator winding work and backup are provided, with index number Pt100 ; The instrument monitors the leakage of the water cooler; the two-piece seated sliding bearings are equipped with on-site temperature display instruments and remote signal terminals, respectively.

The information in this article comes from the Internet and was reorganized and edited by China Rescue Equipment Network.