[Lab] Help choosing a stepper motor

[Wesley Ellis]

My project involves rotating the platform by small increments then checking
if there's something in range with an ultra sonic sensor, so a stepper
motor where I can move my platform by a fixed amount easily seemed like a
better idea than a regular motor and deriving my distance travelled based
on how long I had the motor on for.
On Nov 6, 2013 10:22 AM, "Chris de Groot" <cdegroot at adobe.com> wrote:

> It would be interesting to know how Wesley decided a stepper motor was
> suitable for your use case.
>
>
>
> There are several of different options.
>
> Stepper Motors are good for very precise control of fairly slow rotation
> where you may also want to rotate by very precise amounts. They have
> downsides, they require a lot of electronics and often some software to
> work, are not that powerful relative to other motors, consume more amps for
> similar work and are more expensive.
>
>
>
> If you wanted to do something like rotate a platform continuously, even
> reversing it backwards and forwards, and did not care too much about fine
> accuracy or specific speeds a regular motor may be something to look at.
> For example a windscreen wiper motor(from princess auto surplus) is a nice
> usable package. With a small amount of electronics you can get speed
> control and backwards/forwards motion.
>
>
>
> Consider this simple circuit for a “most useless machine ever” project.
> Simple and effective
> http://9x20lathe.blogspot.ca/2010/01/components-and-schematic-for-useless.html
>
>
>
> Speed control is fairly easy with a regular motor. But for a stepper can
> actually get pretty complex with ramp up and down for starts and stops etc.
>
>
>
> C.
>
>
>
> *From:* Lab [mailto:lab-bounces at artengine.ca] *On Behalf Of *Bob
> *Sent:* Tuesday, November 05, 2013 8:05 PM
> *To:* Lab at artengine.ca
> *Subject:* Re: [Lab] Help choosing a stepper motor
>
>
>
> As a non-technical person my suggestion may be way off base, but perhaps
> working with the guts of a scanner would fit the bill. Motor and belt
> already to go.
>
>
>
> Bob
>
>
>
>
>
> *From:* Lab [mailto:lab-bounces at artengine.ca <lab-bounces at artengine.ca>] *On
> Behalf Of *Wesley Ellis
> *Sent:* Tuesday, November 05, 2013 7:28 PM
> *To:* Michael Grant
> *Cc:* lab
> *Subject:* Re: [Lab] Help choosing a stepper motor
>
>
>
> No, the stepper motor is going to drive a pulley to rotate a platform
>
> On 11/4/2013, 9:52 PM, Michael Grant wrote:
>
> Does the mass need to be lifted against gravity?
>
> Michael
> --
>
> http://krazatchu.ca/
>
>
>
> On Mon, Nov 4, 2013 at 9:45 PM, Wesley Ellis <tahnok at gmail.com> wrote:
>
> The mass isn't very heavy (probably 500g) and I don't need the resolution
> of something like a cnc or 3d printer motor and speed isn't super important
>
> On Nov 4, 2013 9:36 PM, "Michael Grant" <michael at krazatchu.ca> wrote:
>
> The easy driver is for bipolar only, it's a good choice for small steppers
> (NEMA17).
>
>
> There are many choices on eBay as well, about $11 will get you a serious
> CNC driver for larger steppers (NEMA23).
>
> http://www.ebay.ca/itm/Good-CNC-Router-Single-1-Axis-Controller-Stepper-Motor-Drivers-TB6560-3A-New-/251369064893?pt=LH_DefaultDomain_0&hash=item3a86c389bd
>
>
>
> What resolution and speed are you looking to achieve?
>
> The mass you are rotating, is it heavy and will you require fast start and
> stop?
>
> Michael Grant
> --
>
> http://krazatchu.ca/
>
>
>
> On Mon, Nov 4, 2013 at 9:22 PM, Wesley Ellis <tahnok at gmail.com> wrote:
>
> Hey all,
>
> I'm pretty new to electronics and I'm having trouble choosing a stepper
> motor for a project I'm working on.
>
> I'm ordering from robot shotp, and it looks like this EasyDriver board
> (
> https://secure.robotshop.com/ca/en/sfe-easydriver-bipolar-stepper-motor-driver.html
> )
> will let me control whichever motor I end up choosing, but the number of
> motors on robotshop is pretty intimidating.
>
> I'm going to be spinning a small platform so I don't need a lot of
> power. Basically, I'm wondering whether I need a bipolar or unipolar
> motor? What kind of voltage? Amperage? Any help would be appreciated
>
> Wesley
>
>
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