Hi everyone, This question was born tonight after having to cobble up a way to finish a small milling project out in the shop. I own one of those seig mini mills that you can get from Harbor Freight, and Cummings etc. and the second motor controller has burnt out. Ok....Done. I'm building my own next time! I understand how pulse width modulation works, but all of the circuits I see online are intended for a small motor. I did however find one web site that the fella built one for a motor to run a scooter or something and it looks like he simply used more that one transistor to carry the load of the motor. How does this work?
The reason I'd rather build my own is not only to learn more about pwm but also if this one conks out I'll have a better chance of fixing it instead of mail ordering ...yet another mini mill motor controller. rite now (forgive me) I'm running a household dimmer switch through a bridge rectifier. It sucks but it got the job done.
This motor is a 110 volt dc 250 watt motor. So I'm inclined to try a the 555 approach. with multiple transistors. (?)
Any suggestions, hints or smacks in the back of the head are appreciated.
The reason I'd rather build my own is not only to learn more about pwm but also if this one conks out I'll have a better chance of fixing it instead of mail ordering ...yet another mini mill motor controller. rite now (forgive me) I'm running a household dimmer switch through a bridge rectifier. It sucks but it got the job done.
This motor is a 110 volt dc 250 watt motor. So I'm inclined to try a the 555 approach. with multiple transistors. (?)
Any suggestions, hints or smacks in the back of the head are appreciated.