hello everyone, I am new to this forum and am in need of some serious help. I make stepper motor generators and get just over 30 dc volts from it. I use rectifier diodes to make this happen. I would like to come out with a new design to produce more voltage. I am a auto mechanic so this field is alittle out of my range, but I will not stop at figuring this out. Anyone here know of better circuits to make, like a doubler? Thanks for any help I can get.
If you want a higher output voltage use an industrial stepper (e.g. welder robot). They are made for higher supply voltages and can produce higher voltage as well.
what do you mean? let me explain, I use Wilesco Steam engines to spin these stepper motors, Electric Generator For Stationary Steam Engines - Generator with Lamp and Volt
as seen here. So the torque can not be high, infact a low torque would be awsome. The specs of this motor are 12 v, 3.6 degree. and after adding a bridge rectifier I get 30 dc volts. Is there a way to make a better bridge? I use 4 rectifier diodes to get these results
Those motors are great to be used as an exiter for windmill projects.
Old VCR's, photo copiers and printers have lots of them.
Max. voltage is usually around 24 to 30 volts ac.
Many or the stepper motors can be taken apart and each phase can be isolated to give you several independent AC outputs. Then its just a matter of rectifying each one and stacking them in series to get a higher voltage. However you will loose amperage in the trade off.
Its the same concept as taking an alternator apart and isolating and rectifying each phase then stacking the now independent DC sources to get higher voltages out.
True. But all the bigger ones with bearings I have are screwed together.
Besides he works on cars he should understand spot welds and glue better than most of us!
How much torque can you afford to lose on the ones you're currently using? Simply gearing the stepper will make it spin faster, give you a higher voltage. If increasing the gear ratio to give you the higher voltage causes too much torque then a new stepper is going to do exactly the same thing, maybe slightly more efficient because you don't have gear train loss, but you're going to have to trade torque for voltage and voltage for current. You can't just increase the voltage with the same torque and get the same current.
I can not afford to loose that much torque with these engines, they are small. I was thinking that to try and find a stepper motor that has 7.2 degree, and still has an output of 12 volts, then I will add the bridge rectifier and double the output. Any one know how to tripple the out put of this motor now?
seis... You can't increase voltage at the same current without more torque, it violates the first law of thermodynamics. You can't make three apples out of two =)
I attempted to do this with a stepper motor froma c rom and the whole magnet + shaft just came out with tiny metal balls.Pulling them apart isnt easy like you said if they are samll ones.