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  #1  
Old Mon 31 August 2009, 19:00
Castone
Just call me: Leo #41
 
Soddy Daisy , Tn
United States of America
Keling KL34H280 Power Supply Help Wanted

These are the motors that I will be using,640 oz from Keling . Will these motors work with this power supply. I will be wiring them Bipolar parellel. The power supply is 50V /1000 watt 20A. Any feedback welcome. I have read every post I could find, but I am still alittle blurry on this, Thanks
Attached Files
File Type: pdf KL34H280_45_4A[1].pdf (93.0 KB, 60 views)
File Type: pdf KL34H280-45-8A[1].pdf (216.4 KB, 53 views)
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  #2  
Old Mon 31 August 2009, 21:47
domino11
Just call me: Heath
 
Cornwall, Ontario
Canada
Leo,
Take a look at Wiring the PK296A2A-SG7.2 motors & power supply voltage selection
Mike Richards goes through the calculations to determine voltage for the different configurations.
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  #3  
Old Tue 01 September 2009, 12:09
Richards
Just call me: Mike
 
South Jordan, UT
United States of America
The KL34H280_45_4A motor has 6.8 mH inductance, It can be used with power supplies up to 80VDC (32 X SQRT(6.8) = 83VDC. 80VDC is the MAXIMUM voltage that the Gecko stepper drivers can handle.) 18 amps would all full speed under all conditions.

The KL34H280-45-8A motor has 2.2mH inductance when wired either half-coil or bipolar parallel. It can be used with power supplies up to 47VDC, using that same formula shown above. 25 amps would allow full speed under all conditions.

I would use a 70VDC power supply for the first motor to allow for power line variations. I would use a 35VDC to 40VDC power supply for the second motor, also to allow for power line variations.
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  #4  
Old Tue 01 September 2009, 17:35
Castone
Just call me: Leo #41
 
Soddy Daisy , Tn
United States of America
Power supply

Thanks Mike, I will keep looking then. I found a 38V 500VA but it is only 15A. I ran the math from one of your post, just having problems finding a good match was hoping I could get by going a few volts over. You truly are a blessing to this forum.
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  #5  
Old Tue 01 September 2009, 22:39
Richards
Just call me: Mike
 
South Jordan, UT
United States of America
Although I do NOT recommend exceeding the maximum voltage computed with Marris's formula, you could go a few volts over if you limit the current. Remember that Amps X Volts = Watts, so if your volts go up, the amps must come down. The problem with doing that is that a stepper motor / stepper drive does not give constant current, so the heating may be non-linear. In other words, going up just a few volts, even when limiting the current MIGHT cause over-heating. Because of normal variation in line voltage, I prefer to use a power supply that is 75% to 80% of the maximum voltage computed by the formula.

If you limited the current to 5.5A to start with (about 175K resistor) and then watched the motor's temperature you could tell if you could increase or decrease the current. Allowing 6A would require a 280K resistor.

When selecting motors, I prefer one that puts out about 600 oz*in when wired half-coil whenever possible. That allows the temperature to stabilize at about 65C instead of 80C when the motor is wired bipolar parallel.

A motor that puts out about 450 oz*in with a 3.6:1 belt-drive would give about 1,600 oz*in of torque which is much more than you need to do the job.
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