Hi All
I am about to embark on a AC Single Phase Motor Drive project to control the speed of my drill press. In New Zealand where I am from domestic single phase power supply is 230VAC @ 50Hz. The Drill press Motor in question is approx 400W.
I have done quite a bit of reading and plan to use a H Bridge to switch rectified and filtered 230 VAC and then output it to the motor from here.
I will use a PIC Micro and a lookup table for generating the pwm duties for creating the sine wave. I am aware that I will have to also change output voltage as well as frequency (of my pseudo sine wave)
My biggest question is regarding filtering, I plan to use a pwm frequency of maybe 15 KHz or more and I know I will need to include filters to stop it from causing interference.
Will I need to filter both the AC side to stop the switching frequency from entering back into the supply system or will I also need to filter the motor side too?
I have spent quite a bit of time searching forums and Google and are having very little luck finding information regarding the filter side of this project so any suggestions that people can provide will be greatly appreciated.
Regards
Bruce
I am about to embark on a AC Single Phase Motor Drive project to control the speed of my drill press. In New Zealand where I am from domestic single phase power supply is 230VAC @ 50Hz. The Drill press Motor in question is approx 400W.
I have done quite a bit of reading and plan to use a H Bridge to switch rectified and filtered 230 VAC and then output it to the motor from here.
I will use a PIC Micro and a lookup table for generating the pwm duties for creating the sine wave. I am aware that I will have to also change output voltage as well as frequency (of my pseudo sine wave)
My biggest question is regarding filtering, I plan to use a pwm frequency of maybe 15 KHz or more and I know I will need to include filters to stop it from causing interference.
Will I need to filter both the AC side to stop the switching frequency from entering back into the supply system or will I also need to filter the motor side too?
I have spent quite a bit of time searching forums and Google and are having very little luck finding information regarding the filter side of this project so any suggestions that people can provide will be greatly appreciated.
Regards
Bruce