SIMULINK model based optimization for induction motor

• Main Author: Poon, Di Ming.
• Other Authors: School of Mechanical and Aerospace Engineering
• Format: Final Year Project
• Language: English
• Published: 2011
• Subjects: DRNTU::Engineering::Mechanical engineering::Motors, engines and turbines
• Online Access: http://hdl.handle.net/10356/45977
• Institution: Nanyang Technological University

Since 20 centuries 80’s, with the development of alternating current machine, power electronic and converter devices, electric propulsion system (EPS) has been applied not only on warships but also on the normal commercial ships. Substitution of most mechanical equipment by their electrical counterparts offers potential benefits. The EPS simulation tools have been developed for through-life energy management, ship handling, and electrical network analysis. In contrast, interactions between the dominant mechanical systems and the electrical network are poorly understood. In order to improve EPS, it will be better to understand the mechanical-electrical network interactions. This will draw the attention to understand its crucial part, the induction motor drive. There are many modelling methods to simulate induction motor such as transformer model, and state-space models. There are four types of state-space model[5], namely energy model, fixed framed model, rotating frame model, and field-oriented model. The entire four state-space model is basically the same as one model can transform to another by changing the voltage and current reference point. This research will build the model based on different modelling methods and test them to see which of the model able to produce the best representation of a real induction motor. The author built the transformer model and the state-space energy model. The model should at least able to produce a torque versus speed graph. The graphs were then being compared with the ideal graph shown by the reference. For the state-space energy model, the author managed to generate graph illustrating the transient operation of the induction motor. Generally, the state-space energy model is a better approximation to a real induction motor compared to the transformer model. The transformer model lacks of the ability to study the system during transient operation. And based on the graphs, the state-space energy model were showing results similar to those in reference except for its shorter time to reach steady state. In addition, state-space energy model enables user to construct sub-models with individual functions before compiling into a complete system.