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Stepper Motor
 Moderated by: Si.
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 Posted: Sat Dec 2nd, 2017 07:19 am
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Michael M
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Ran across this mini stepper motor on eBay: https://www.ebay.com/itm/5PCS-2-phase-4-wire-Mini-Stepper-Motor-DC5V-7MM-Micro-linear-screw-slider-DIY/191946456517?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2060353.m1438.l2649

Would these be any better than the DC motors that we currently use in our engines?



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 Posted: Sun Dec 3rd, 2017 11:30 am
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Warren G
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probably not,
driver circuitry would be a lot different, a change in decoders, transformers, etc ..



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 Posted: Sun Dec 3rd, 2017 12:42 pm
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Helmut
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It has been done successfully. But it's not worth the effort. For a given torque, you need a higher current, a decoder that is able to generate the stepper signals, and a lot more space in the model because these electronics need room. Märklin has done something similar with its C-Sinus drive, but that, too, could only be implemented into spacious hoods of electrics or diesels in H0.

In addition to this - the BLDC motor ( as it is employed in C-Sinus) is the future's motor because you have better electrical characteristics. But for low rpm, you need Hall sensors to get position feedback, or a much higher gearing to use EMF feedback motors with their necessary high Kv-value ( rpms /Volt ). The Motors you can buy at the moment start with values ~ 1300 and aim at the drone/airplane market. Their dimensions are not quite fit for H0 or smaller. The really small ones are not availabkle for the hobbyist market - but if you consider to order 1000+..hmmm....the wholesale outlet will give it consideration.

Last edited on Sun Dec 3rd, 2017 07:20 pm by Helmut



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 Posted: Fri Dec 8th, 2017 06:38 am
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bobquincy
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I agree that Brushless DC motors are our future. Once the HO size motors get sensors there will be little reason to use a brushed motor except at the low price end of the market.

I tried a 12 mm diameter BLDC motor and it worked well once the speed was high enough to provide a decent feedback signal but for low speed operation it was useless.

Stepper motors are noisy (at least the ones I used were) at speeds we would use. I used some for rotating a target wheel for a magnetic sensor and it made far too much noise to use in a train. They are great for precision positioning, like a turntable or a turnout actuator.



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