Motors stand up to test of climate control
A
Lafert Electric Motors product story
Edited by the Engineeringtalk editorial team
Mar 25, 2005
Extremes of temperature and high humidity levels are not the best environments for AC induction motors.
Extremes of temperature and high humidity levels are not the best environments for AC induction motors.
Yet these are the conditions that Temperature Applied Sciences (TAS) of Goring-by-Sea creates for its clients, and needs motor driven fans to perform in to maintain evenly distributed atmospheric conditions.
TAS' environmental test/storage chambers are employed in many areas of industry, from industrial manufacturing through to pharmaceutical/scientific research clean-room applications.
Applications include climatic shock, burn-in processes, storage and product endurance testing for every stage from R and D to end-of-line batch testing.
Climatic conditions created inside the chambers range from -80 to +180C and 98% humidity at 95C, and chambers vary in size from something similar to a domestic microwave up to drive-in enclosures big enough for earthmoving plant.
Because of the extremes inside the chambers, TAS decided to locate the fan driving motors outside and attach the fans on extended shafts.
Originally they tried simply fixing extensions to standard shafts.
Fine when the fans were located in the ceiling of the chambers with the shafts at the vertical but, when located in the walls, there was shaft distortion, excessive bearing wear and shaft run out, added to which there were problems with supply.
These problems have now been resolved with the help of AEG Electric Motors which specialises in customised solutions for nonstandard motor applications.
The problem was overcome by AEG by supplying a variation of its AM 71 frame single phase motor.
It has a 400mm long, 14mm diameter stainless steel shaft and modified bearings to cope with the loadings resulting from the fan impellers being located at the end of the elongated shafts.
"The AEG motors have resolved both our technical difficulties and supply problems", says Martin Stevens, TAS Director.
"As a result", says Stevens, "we are adopting another size of motor (56 frame) with extended shaft for our smaller climatic chambers".
AEG's motors are used to drive fans with blade diameters from 150 to 300mm and are controlled via the totally integrated control system that ensures climatic conditions are maintained accurately.
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