Mechanical Structure and Protection Degree of Gamak Electric Motors
Gamak electric motors are produced in accordance with IP 55 protection degree so that they can work in dusty and humid environments due to usage conditions. Electric motors can be operated in a covered outdoor environment without the need to take any special precautions against moderate atmospheric conditions. Electric motors must be protected from direct sunlight.
Protective Measures in Gamak Electric Motors
The following protective measures should be taken against extremely harsh climatic conditions such as working in open environment, wet humidity, corrosive chemicals or coastal atmosphere.
• Special protective paint should be used.
• The degree of protection IP 56 must be stipulated.
• Winding heads should be protected with a special lacquer against excessive humidity.
• In all kinds of vertical installations open to the atmosphere, the following solutions should be applied to prevent water infiltration from the shaft edges into the motor, in a way that does not hinder the motor's cooling system:
• Shaft end down: Covered with an additional protective cover (Canopy),
• Shaft end up: Covered with a special protective cover or fitted with a bearing seal.
Measures to be taken against water condensation in Gamak Electric Motors
The water discharge holes, which are closed with plastic plugs, are opened to the lowest point of the housing in accordance with the construction type/installation order of the motor and should always be kept clean. If the plugs are removed, the degree of protection of the motor enclosure is IP 44.
However, it is the most appropriate method to prevent water condensation by keeping the inside body temperature of fully closed motors at the prescribed level. For this, we recommend the following applications.
Two heaters should be placed on the front and rear winding heads of the motor with the total powers recommended in the table below. However, the heater must be disabled before starting the motor.
Another solution is to apply a voltage as low as 5...10% of the motor supply voltage and a current of 20...30% of the rated current to the U1 and V1 terminals by means of an auto-transformer after the voltage supplying the motor is cut off.
Cooling in Gamak Electric Motors
motors of size 56 do not have a cooling fan (IC 410), they cool by free dissipation. motors of size 63...450 are externally cooled by a cooling fan operating in a perforated case cover made of sheet steel (IC 411). On the back surface of the propeller case bowl, holes suitable for the conditions of the standard test finger and suitable for sufficient air passage are made. The cooling fans of the 63...355 frame size motors are made of high quality reinforced Polyamide material, and the 400 and 450 frame sizes are made of aluminum alloy. The cooling fan is fixed to the shaft output at the rear of the motor and operates regardless of the direction of rotation.
Terminal Box in Gamak Electric Motors
All terminal boxes comply with IP 65 protection degree and are placed on the front of the motor so that it can be rotated 180° so that the mains cable entry can be made easily from both sides. In general construction, the motors have 6 fixed terminals and there is a ground screw in the terminal box in direct contact with the body. The terminal boxes of frame size 56...180 motors are made of high quality reinforced Polyamide, those of frame size 200...450 are corrosion-resistant pressure die-cast aluminum alloy. On request, the terminal boxes of motors in frame size 71...132 are made of corrosion-resistant pressure die-cast aluminum alloy.
Cable Input in Gamak Electric Motors
Cable entries to the terminal box are provided by means of glands manufactured in accordance with EN 60423 and according to DIN EN 50 262 or by means of waterproof (IP 68) glands upon special request.
Bearings in Gamak Electric Motors
High-quality, sound-controlled deep groove ball bearings (DIN 625) or cylindrical roller bearings (DIN 5412) are used in electric motors. Single row deep groove ball bearing design is offered as standard in GAMAK electric motors. In motors with frame size 132 and above, if the radial force applied to the motor shaft end is above a certain value, a cylindrical roller bearing design with greater radial force carrying capacity should be selected. If the axial force applied to the motor shaft end is above certain values, a special design motor may be required.
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