Need driver

[69fordf100]

just bought 6 japan servo KH42JM2B186 and now i'm starting to build a driver and cannot find a circuit that would work with the voltage in the data sheets i found. I may be overthinking this and it just be as simple as any driver, but i am budget limited and do not want to keep blowing drivers or motors.

[James Newton]

So what is the voltage in the datasheet?

Actually, nevermind. It's the current flowing through the coil that matters, so as long as the driver you use regulates current, and you limit it to the max current rating on the datasheet, you will be ok.

So what is the /current/ rating per phase in the datasheet?

[69fordf100]

http://www.japanservo.co.jp/digital/.../pdf/KH42J.pdf
According to this datasheet I found, it looks as though I could be anywhere from .5 to 1.2 amp cannot figure out if I'm a 901,902, or 903 but I am unipolar.
From what your saying, I gather voltage does not matter much as long as the amps do not go to high and burn out tue motor windings?

[James Newton]

Well, there is typically a maximum rated voltage, but if you know the rated current, and you measure the ohms through the coil, you can find that E=I/R where I is current and R is resistance. And since most drivers will regulate current (not voltage) that is the spec you really need.

Grab your ohmmeter, or buy a cheap one if you haven't already, and measure the resistance of one coil. Then you can lookup what motor you have by checking the "winding resistance" line on that datasheet.

BTW, that motor will do well with the Linistepper driver. I'm adding them to the list of good motors.
http://techref.massmind.org/techref/...tep/motors.htm

[69fordf100]

thank you very much. I also looked at you techref site and noticed you had them on there without a price. I found them on ebay and they were very cheap.
http://cgi.ebay.com/ws/eBayISAPI.dll...=STRK:MEWAX:IT

[James Newton]

Originally Posted by 69fordf100 thank you very much. I also looked at you techref site and noticed you had them on there without a price. I found them on ebay and they were very cheap. http://cgi.ebay.com/ws/eBayISAPI.dll...=STRK:MEWAX:IT

You aren't seeing a price at the techref site? Did you scroll down to the kits section?
http://techref.massmind.org/techref/...index.htm#kits

Oh, hang on... that ebay link is for a motor... LOL... I don't sell motors. I just have a list of motors that I know work ok with the Linistepper. The Linistepper is a FOS (Free Open Source) design, but I DO sell a kit for the driver.

[69fordf100]

just checked the and I'm getting18.5 which means that it was the 903. Would the linistepper be a good choice to run with the this motor? 9.25volts .5a and 18.5ohms

[James Newton]

Originally Posted by 69fordf100 just checked the and I'm getting18.5 which means that it was the 903. Would the linistepper be a good choice to run with the this motor? 9.25volts .5a and 18.5ohms

Absolutely!

You would want to setup the current sense resistors as 2 ohm, instead of the 1 ohm supplied with the kit so it will current limit to a half amp. If you buy a kit, there are resistors available to tune the kit for 2 amps, which is the direction most people want to go, but those same resistors can be connected in series so as to make a 2 ohm resistor and tune for 1/2 amp.

[MikeZee]

Need a driver ? i have 20 years exp. clean licence and know N. E like the back of my hand.