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  #1  
Old Wed 02 October 2013, 15:41
markwiggs
Just call me: wiggs
 
ak
New Zealand
A possibility

Hey all,

I have done some numbers on four PK296A2A-SG7.2 motors and gecko 203v

32 x sqrt 1.5 = 39 volts + 20% =46Volt DC

Running half Coil

3A x 4 Motors = 12Amps X .67 = 8.04Amps

Volt x Amps / watts

46V x 8A = 368VA

So with that in mind is my maths sounds? and i then stumbled across this? would it be suitable? I just cant understand how it is so Cheap? 69USD

http://www.homanndesigns.com/store/i...products_id=82
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  #2  
Old Wed 02 October 2013, 17:48
smreish
Just call me: Sean - #5, 28, 58 and others
 
Orlando, Florida
United States of America
its a switching power supply....not 100% duty rated.
Won't work well for long. Get a real Toroidal for about double that from:

https://www.antekinc.com/
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  #3  
Old Thu 03 October 2013, 10:09
Richards
Just call me: Mike
 
South Jordan, UT
United States of America
Have you already purchased the motors? If not, you may want to consider using a PK296 motor with Metalhead's belt drive assembly.

You'll get much more torque and about 2X the speed. The belt drive multiplies the motor's torque by the gear ratio. Depending on the motor and the way that you wire it, you'll get about 300 oz*in or 450 oz*in of torque. That will give you 1,200 or 1,800 oz*in of torque with a 4:1 belt drive.

With a 1.25" pinion and a 4:1 belt drive, each step will be 0.000491 inches. At 35,000 steps per second, that axis could jog at 17 inches per second.

The PK296A2A-SG7.2 motor is limited to about 700 oz*in of torque because of the gears used. With a 1.25" pinion, it moves an axis 0.000273" per step. At 35,000 steps per second, that axis could jog at 9.5 inches per second.

Using either motor, the ramp (acceleration) setting must be long enough that the motor can move the weight (mass) from standstill to top speed.

My personal preference would be a PK296-F4.5 motor wired parallel. For heavier loads, the PK299-F4.5 wired parallel is even better. The smaller motor is about $140 and the larger motor is about $210.
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