Analysing Torque-slip Characteristic of a Small Power Induction Motor Operating under Geophysical Conditions

摘要

The article analyses the torque-slip characteristic of a small power induction motor up to 50 W used in mechatronic system drives of a borehole investigation devices, that works at a wide range of temperature (from -20 degrees C to +150 degrees C) and is supplied through a long geophysical cable with complex impedance which changes from (Z) under bar (C) = (127.5 - j1.8) Omega to (Z) under bar (C) = (165 - j2.9) Omega. The external diameter of the induction motor is up to 36 mm, the number of stator teeth is 8. The torque-slip characteristics have been calculated for different cases, when the stator winding is single-layer, two-layer short-pitch and sinusoidal, motor rotor is solid and copper-cage solid. The calculated torque-slip characteristics at environment temperature +20 degrees C were compared with the tested performed experiments.