[Lab] Help choosing a stepper motor

[Michael Grant]

I'm sure a NEMA 17 size stepper would suit purpose.
The EasyDriver is more than capable for this application.

Michael
--
http://krazatchu.ca/


On Wed, Nov 6, 2013 at 5:37 PM, Wesley Ellis <tahnok at gmail.com> wrote:

> 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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>>
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