电机槽楔故障.docVIP

Top of Form Bottom of Form Curriculum Vitae for J.H.M. de Swardt (Henk) - Published Papers: Electric Motor Failure Prevention: Wedge Failures Life! / Lewe!Education and training Full time work experience Published papers Part time work experience Vacation employment Leadership abilities Computer Literacy Contact me For the first time ever, the papers I wrote are now also available in HTML format: Electric Motor Failure Prevention: Wedge Failures. ? By Henk de Swardt Article Published in Energizer [1] of November December 2003 and February 2004: ? ? Electric Motor Failure Prevention: Wedge Failures By Henk de Swardt, Engineering Director, Marthinusen Coutts ? ? Theoretically each electric motor should last a minimum of twenty years if it is operated within design parameters - without failing! ? In reality experience taught us to expect a life of only five years before the first failure occurs! Why is this so? Customers spend large amounts of money to purchase, install, and maintain their population of electric motors. Even when vast amounts of money are spent on routine maintenance, preventative maintenance, and even predictive maintenance, the failure rate of electric motors does not seem to decrease! In this article, I will explain the reasons for the motor failures due to wedge failure. ? Generally, there are several different slot types and wedge configurations. In this article the most common types will be addressed. Firstly the random wound type coils used in low Voltage motors will be discussed. Secondly, the medium and high Voltage (and high power) motors will be discussed extensively. ? ? A. Random Wound Coils ? Commonly also referred to as mush wound coils, this type of coil is mostly used on low Voltage windings. In short, the winding consists of a number of enamel coated round section copper wires, randomly wound in an elliptical shape. These wires are inserted into the semi-closed slot, one (or more than one wire) at a time. Picture 1 shows a stato