Abstract

Tasks of this Diploma Thesis were on one Hand side to operate the EC Motor with low numbers of revolutions and to modify the existing hardware to allow an oscillating motor operation. On the other side we had to analyze a dosing system with EC motor which has been developed by ALLDOS in Karlsruhe, Germany. Goal of this analysis was the improvement of the implemented regulation system. In addition we had to build a mathematic model which fits the requirements.

The analysis of the ALLDOS system was quite time intensive, due to circumstance that the supplied model had to be prepared for the necessary measurements. First we had to implement a Chopper to prevent the electronic circuit from damage in 2Q operation. To get a voltage that is linear to the number of revolutions, we had to create an electronic revolution measuring meter to be able to accomplish the necessary measurements. After this the system could be examined and a clear improvement could be achieved for the automatic controller.

The oscillating motor operation was realized with a simple external control (PIC). An implementation of this control into the DES 50/5 controller is not possible without the agreement and assistance from Maxon Motor Company, because there is no external access to it. This implementation was not made due to the circumstance that the temperature behaviour in this operation mode was the major goal of this task. With our measurements we can show that the EC motor is well suitable for an oscillating operation. The coil temperature remained even after one hour of operation at maximum speed clear underneath the allowed maximum temperature of +125 centigrade.