This is connected to the electromagnetic stirrer that I'm working on which I discussed in another post - for those who remember...
Anyways, I wanted to smooth out the voltage going through the coils as I vary the voltage to get a smooth spin on the magnetic pill. And since I'm doing this project with an Arduino, I only have PWM to work with. So to smooth it out, I use an RC filter which initially works pretty good.
Here is the input PWM vs filtered output before putting the load on it
Then, I attach the coil and move the leads of the scope as per this drawing
However, this is the final result...
The voltage going through the coil seems to spike pretty quickly on the up and the down swing...
Using photoshop, this image is more what I would LIKE the wave through the coil to look like.
Is there anything I can do to smooth it out? I'm assuming that the spiking is because of the inductive properties of the coil?
Anyways, I wanted to smooth out the voltage going through the coils as I vary the voltage to get a smooth spin on the magnetic pill. And since I'm doing this project with an Arduino, I only have PWM to work with. So to smooth it out, I use an RC filter which initially works pretty good.
Here is the input PWM vs filtered output before putting the load on it
Then, I attach the coil and move the leads of the scope as per this drawing
However, this is the final result...
The voltage going through the coil seems to spike pretty quickly on the up and the down swing...
Using photoshop, this image is more what I would LIKE the wave through the coil to look like.
Is there anything I can do to smooth it out? I'm assuming that the spiking is because of the inductive properties of the coil?
Comment