A DEVICE FOR ENDURANCE TESTING OF TRACTION MOTOR FANS AND A METHOD THEREOF

摘要

A device for endurance testing of cooling fan impeller of a traction motor with variable speed up to 3000 RPM and variable shock load comprising a steel structure having a main frame of steel structure and first end of the main frame is provided with a drive motor with variable speed controller and the second end is provided with an impeller and a set of base plates disposed on the main frame and a plurality of springs are housed in between the two base plates and one fan impeller along with a shaft and a plurality of bearings are mounted on the base plate and one flexible coupling is mounted with the main shaft of driving motor and the shaft of the impeller. A mast like steel structure attached on the middle of the device and disposal at right angle of the device from where a load is applied on the shaft by means of a cam which is operated by a Gear motor mounted on the rear side of the device whose speed can be varied to change the frequency of shock loads and a two element rectangular strain gauge rosette is placed on the impeller for recording dynamic stain; characterised in that during rotation of the impeller a vibration imparted on the bearings of the impeller from the adjacent spring housing and subsequent load application in different time interval and amplitudes on the said impeller evaluates the possible endurance which is recorded by simulation wherein a rectangular strain gauge rosette inserted in the impeller for reading/recording dynamic strain.