I build material for the car training. This material is used in developing countries and should be inexpensive and mostly available in the country. I am developing a concept to build externally excited synchronous, permanently excited synchronous and asynchronous motors based on 12V car alternators. The alternator is a separately excited synchronous machine. By exchanging the rotor the other two motors can be build. Thus, the usual electric motors in electric cars can be demonstrated in a practical way. So, now my problem: I have already experimented with the VESC. I got the externally excited synchronous motor to turn but not satisfying. I do the excitation of the rotor with an extra controllable power supply .I have set the app to ADC. Actually I want to do a pure speed/frequency control. Is that possible? The automatic adjustment of the parameters does not seem to work well. How can I do that? Is there someone who has experience with this or can support me? best regards daniel
Simply, you could use it just a normal motor. However, the field supply could be linearly increased by current or rpm. This could be investigated.
The additional HW is just a power amplifier alike from ST 149 or L165. It will be powered with an additional dc supply voltage of say 15V. Power Op-amp's output is to be connected to the field coil. Power Op-amp's input is taken from for example motor current output. As motor current increase, field current also increase. Or, rpm tacho output is taken into account. Just, to be tried. A few years ago, I had worked on such a project, and about 2x500W motor successfully done. It had a (twin) dual stator system.
For field supply, additional vesc could also be used as a dc motor controller.
Hi, thank you for your help. This week i have no time for this project. I will give you next weeks some more informations and detailed questions. Best regards Daniel