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anyone help me?

hoolko

Mar 14, 2013
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Mar 14, 2013
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i build lapidary grinding machines with a dc motor of 90v,,,,2.9 amps........i use a 4a 100v bridge rectifier to convert ac to dc and use a standard dimmer switch to adjust motor speed.....id like motor to run a bit smoother,,,,,,need your expertise to add any electronic components for smoother running motor
 

ADRT

Nov 25, 2014
192
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Nov 25, 2014
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192
You need a pwm circuit. This would make the motor run smoother than just the dimmer switch.
 
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ADRT

Nov 25, 2014
192
Joined
Nov 25, 2014
Messages
192
You might be able to build one cheaper, but it would take some level of electronics expertise to do so.
 

hoolko

Mar 14, 2013
14
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Mar 14, 2013
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thanks.....im familiar with this one.......my rectifier is 100v and these cheap pwm's are only 90v....they burn out on me.........i cant find a 90v rectifier...only 50v and 100 v...noting in between
 
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hoolko

Mar 14, 2013
14
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Mar 14, 2013
Messages
14
You need a pwm circuit. This would make the motor run smoother then just the dimmer switch.
thanks so much but they burn out with a 100v rectifier............any suggestions? thanks somuch, Nikki
 

ADRT

Nov 25, 2014
192
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Nov 25, 2014
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192
So your coming directly off the house mains to the rectifier? 110vac? Or is there a transformer?
 

duke37

Jan 9, 2011
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Jan 9, 2011
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If the input is around 120V AC, then I would use a 400V bridge to give a bit of spare capability.

You could try a resistor such as a 100W bulb at the output of the dimmer to give it a more stable reference voltage.
 
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