Development of half bridge module based power converters for electric machine test setups

Yazıcı, Özgür
Electric machines need to be tested in laboratory conditions by using machine test systems in order to make sure they perform as intended. However, most of the time it is very difficult to replace the components of an electric machine test system. Usually, their mechanical design is not suitable for different frame sizes and their power converters can drive only a single type machine. So, each setup can be used with a very limited range of electrical machines. This study aims to design and implement an electric machine test bench with modular power electronics that can be used for a wide range of electric machines. Each power module is composed of a half bridge transistor, DC bus PCB, snubber and DC bus capacitors and gate drivers so each one can be used independently by connecting to suitable controller and feedback modules. Design steps for the half bridge module are explained in detail including component selections, protections, PCB design and FEA results for DC bus and gate drive loop. Prototype module is tested under double pulse and RL load tests and results are shown. In order to demonstrate the modular design, four modules are connected to create a three phase inverter with braking chopper. Three phase RL load and braking test results are presented. Finally the system is tested on an Induction machine at different frequencies and current levels. Current limited frequency control method is suggested and implemented.


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Citation Formats
Ö. Yazıcı, “Development of half bridge module based power converters for electric machine test setups,” M.S. - Master of Science, Middle East Technical University, 2022.