Hello great job you have here, My name is Ivailo Minikov from East Europe country Bulgaria ,Sofia city
I have some EV projects two bicycles and one BMW E36 here i have some info about them: wwwDOTevalbumDOTcom/3027
Now i want to make controller for series starter dc motor. I am using starter motor for a second electric bicycle and that thing runs on 12 volts with one button and one relay
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Yesterday i spend many hours building a dc controller.
I am not using PIC because i can't program it . I am using old chip with build in shim modulator. TL494
and mosfet driver tc4422
I have some success with one 400w dc motor with permanent magnets i drive it well watching in my oscilloscope. I test it on 30khz and it runs well.
After that i try it on starter dc motor and the schottky diode that i am using start smoking and after 3-4 seconds burned After that and four irf540 too and tc4422 driver too you know how it is
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Now i made some tests with lower frequency maybe 4khz here is video : wwwDOTyoutubeDOTcom/watch?v=5tmLC2JFfeE
I want to ask you what frequency is recommended for series dc motors ? Thank you for your time