Condition monitoring; efficiency assessment; Electrical and Electronics Engineers Standard 112;  elelctric motor;-line test; rotor speed estimation; stator resistance estimate

In the United States, an estimated two-thirds of the electrical energy consumed by the motor drive system. In general, the motor of industrial applications due to the design power is too high or the load is too low, usually run an average of 60% of the rated load, so efficiency is quite low. Also due to lack of global energy and the greenhouse effect is becoming more serious, improve industrial motor energy usage has attracted more attention. This can be many ways to achieve the design power is too high the motor or the application of more efficient control technologies, such as replacing. Obviously all of these pathways are to establish an accurate assessment on the basis of the energy consumption of the motor u J.

Condition monitoring and diagnostics is a very important issue in motor drives and power systems, because they can effectively improve system reliability, availability and maintainability. Expect the energy consumption assessment and condition monitoring functions done by an integrated product, because they also need to assess the data collection. This further relates to the choice of DC motor efficiency evaluation method. For example, detection of stator winding inter-turn faults, broken rotor bars and bearing wear, the use of current-based spectrum analysis, sampling and collection of the stator current waveform.