Asynchronous explosion-proof motors with a closed-loop rotor of the AИM series are designed to operate from a three-phase alternating current network with a frequency of 50 Hz and 60 Hz with an explosion protection marking 1ExdiaIIBT4 (1ExdIIBT4 for motors without stator winding temperature sensors), work in explosive zones (chemical, gas, oil refining industry) according to the NPAOP 40.1-1.32-01 “Budovi rules electrical installations. Electrical equipment of special installations” and other regulatory documents regulating the use of electrical equipment in explosive zones.
The line of this series of explosion-proof motors consists of 71, 80, 90, 100, 112, 132, 160, 180, 200, 225, 250, 280, 315 and 355 standard sizes, with the number of poles 2, 4, 6, 8 and 10.
The installation and connection dimensions and technical characteristics of the engines are listed in the catalog.
The nominal values of climatic factors under which explosion—proof electric motors are operated fully comply with the requirement – GOST 15150 for products of the type of climatic execution У3, У2, ХЛ2, T2*.
The manufacture of engines of other climatic versions according to GOST 15150 requires prior approval from the Manufacturer.
Table 1. shows the operating temperatures and humidity values of various climatic versions and placement categories.
Table 1. Climatic versions and categories of electrical equipment placement (operating temperatures and humidity).
||Operational temperature, °С
||Maximum relative humidity, %
||100 при 25°С
||98 при 25°С
||80 при 25°С
||100 при 35°С
||80 при 25°С
||100 при 25°С
1 – outside;
2 – under the roof in the absence of direct solar exposure and atmospheric precipitation;
3 – inside, without artificial regulation of climatic conditions;
4 – inside, with artificial regulation of climatic conditions.
У – moderate climate;
УХЛ – boreal climate;
T – tropical climate.
If the ambient (air) operating temperature exceeds plus 40°C, the rated power of the engines should be reduced by 5% with an increase in temperature for every 5°C. The maximum ambient temperature during operation should not exceed 60°C.
Rated power is provided in a long-term operation mode at a temperature of 40°C and an altitude above sea level of no more than 1000m, although they remain operational at an altitude of over 1000m to a height of 4300m above sea level, while reducing the power of the engines.
When operating at an altitude of more than 1000m to 4300m, the load on the engine should be reduced according to Table 2.
Table 2 – Permissible load on the engine
|Height above sea level, m
|Power change coefficient, Kн
– AИM are produced with the binding of capacities to the standard sizes according to DSTU IEC 60034-1:2019;
– 2АИМ are produced with the binding of capacities to standard sizes according to DIN 42673 и DIN 42677 (CENELEC).
Motors should be operated in S1 mode.
The motors, which are produced in a metal case, have the level of protection IP54 according to DSTU EN 60034-5:2015 (fan cover – IP20). Electric motors with rotation height from 71mm to 355mm, the motors in a cast-iron case are produced with the level of protection IP55. When ordering, the level of protection could be changed from IP54 to IP55 with a customer’s agreement.
The motors have the insulation system of the class of heat resistance F (temperature index 155°C). In this case, the excess of the temperature of the stator windings over the ambient temperature of the engines, having a service factor of 1.15, is not more than 83°C, engines having a service factor of 1.1 – is not more than 90°С.
In the stator winding there are temperature sensors РТС(these are thermistors with a positive temperature coefficient of resistance). The electrical insulation of engines intended for operation in mines is level 1 according to GOST 24719 and is designed to operate at a high relative humidity of 100% (with condensation of moisture) and at a temperature of 35°C.
The motors correspond to the class I of protection from the electric shock in accordance with the requirements of c. 2.1 of GOST 12.2.007.0
The engines are manufactured in the following versions according to the installation method of DSTU EN 60034-7:2015:
- on the paws – IM1081(B3) for dimensions up to 250 height inclusive, IM1001 (B3) for dimensions from 280 height inclusive;
- on the feet with a flange – IM2081 (B35) for dimensions up to 250 height inclusive, IM2001 (B35) for dimensions from 280 height inclusive;
- without paws with flange – IM3081(B5) for dimensions up to 250 height inclusive, IM3001 (B5) for dimensions from 280 height inclusive.
When ordering electric motors with the mounting version IM3081(B5), it is necessary to coordinate the installation of the motor.
The motors could have left as well as right directions of rotation. The direction could be changed just when the rotor is in quiescent state.
The motors correspond to the group of operating conditions M6 – vibration loads corresponding to the degree of rigidity 10a (frequency range 1-100 Hz maximum acceleration 1 g according to GOST 17516.1-90).
With manufacturer’s agreement motors with power from frequency-controlled converters can be manufactured (for this purpose you should fill the configuration data sheet).
The root-mean-square value of the vibration velocity of bearing supports does not exceed 2.8 mm/s.
EXAMPLE OF MARKING THE EXPLOSION PROTECTION OF AИM SERIES ENGINES
1 Ex d IIB T4
||Sign of the level of explosion protection for explosion-proof electrical equipment;
||The engine complies with the standards for types of explosion protection;
||Explosion proof enclosure;
||Category of explosiveness of a mixture of gases and vapors with air;
||The sign of the temperature class of electrical equipment (the chemical formula of hydrogen, which forms a combustible mixture with air).