Abstract:

Three-phase asynchronous motor as motive equipment in mine production, are widely used in in mine production. More than 90% of the motor damage is the resul of the abnoamal operation ,which is often caused by the overload, stall, broken phase, three-phase voltage unbalance, grounding and short circuit and so on. These abnormal operation states may cause motor stator current over the rated current. Even more, long-term operation in this state run, may cause motor insulation aging and reduce the mechanical life at the ideal expectation, and even worse, it may burn motor badly. Thus, to analysis of the motor operation state and to find out all kinds of exceptional cases of current characteristics, as the fundation of motor judgment and effective protection, appear more important. As is known to all, motor is a nonlinear, strong coupling, multivariate mechanical and electrical energy conversion system, and the traditional analysis method includes a set of differential equation fiestly, and then using the numerical analysis method to solve its calculation and analysis. The design uses the software SimPower System of Matlab toolbox to realize the motor running analysis, and the simulation analysis of the typical faults such as short circuit, overload, stalland so on of asynchronous motors.

Key words: Three-phase asynchronous motorr, Matlab, malfunction analysis