Submersible Motors coupled ...
Published by Sarfraz Dairkee
Submersible Motors coupled to pumps are squirrel cage type motors most likely 2 Poles with slip in the range of 2- 4% slip (running about 2900rpm).
To accurately measure the slip of the motor you would require an induction coil (about 1000 turns coil of suitable diameter of water proof the motor inserted in that. The coil induces a pulse on every slip and that may be counted to calculate slip and actual speed may be ascertained.