On 4/23/2011 6:57 AM, Mark Wendt (Contractor) wrote:
> On 4/22/2011 5:26 PM, Robert Pabon wrote:
>
>> Man my head is starting to spin! No wonder people just go with steppers and
>> call it a day. Maybe my vision is clouded by ignorance but it doesn't seem
>> like it should be that hard to pick up a brushless DC motor, a suitable amp
>> and make it work. Obviously it would be easier to just buy a sorted
>> motor/driver, but then it would be easier to buy a sorted CNC machine as
>> well.
>>
>> So getting back to the motor amp combination for a second someone have a
>> look at hese for a minute and tell me what you think.
>>
>> This is the motor I am using:
>>
>> http://www.servodynamics.com/Drawing/23S-IE.pdf
>>
>> I am using the IG23CS-64-IE2000-S
>>
>> Servo dynamics recommends the 1224-BLS driver for this motor. The 1224BL is
>> the comparable amp:
>>
>> http://www.servodynamics.com/Specs/1224bl_spec.pdf
>>
>> And here are the amps I was looking at using:
>>
>> http://www.a-m-c.com/download/datasheet/bd30a8.pdf
>>
>> Servo dynamics says I am fine driving with either sinusoidal or trapezoidal.
>> The AMC is trapezoidal. Obviously need to add a filter card, but otherwise
>> it looks to be in the ballpark. Opinions?
>>
>
> Okay, I'm getting a bit overwhelmed here too. I'm currently using
> steppers on my saw beveler, but have future thoughts of upgrading to a
> servo based system. So, if what Robert shows as necessary, for one axis
> I'd need a servo, an amp, a driver, a bunch of cards for the pc end of
> the affair, an O scope, tons of other test equipment...
>
> Have I left anything out? ;-)
>
> I'm really beginning to wonder if it's worth the expense.
>
> Mark
>
>
>
Not necessarily. For instance both the Teco and the Automation
Direct servo drives (and many other packaged systems) also accept step
and direction input or analog velocity control. While not as
desirable, step and direction to those servos does work.
So you could literally disconnect your Gecko or other step and direction
stepper drive, connect a servo drive via step and direction and go after
setting the drive up with its own commissioning software ( not
difficult) be up and running.
If you are going to buy a BLDC motor and match it up with another
companies drive, that can be a chore.
Using a packaged motor/drive eliminates the work of matching up the
drive and the motor so you are left with tuning the loops in EMC2 to
control the drives via analog control.
Dave
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