04-16-2006, 03:25 PM
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| | | Join Date: Dec 2005 Location: USA
Posts: 3,319
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A transformer capable of 600va (60volts x 10.2) amps would be a reasonable starting point for continuous duty for that motor IF you don't plan to ask for lots of instantaneous rapid moves.
More/multiple motors drawing power from same P/S would need comparable voltage but with more amperage capability - perhaps 18 to 20 for starters, again for continuous duty use.
More current capability from transformer only means that you can run it at full current draw without seeing power reductions due to voltage drop as you meet/exceed current capability of the transformer.
Keep in mind, PEAK current can EASILY exceed 10 amps (as denoted by the "demag current" rating. This would suggest that the motor can and will instantaneously draw even MORE than 10 amps at rapid start/move commands - thus, plan on even MORE current reserve from transformer and/or LOTS of capacitance.
Thus, you may want a current capability of 40-50 amps from the transformer. With this much current capacity, you can probably program your servo amp to fold back current to limit max current draw to 40 amps or a bit less to prevent demag'ing the motor's magnets.
Naturally, the motors you are going to try to use off same P/S with same 40 amp peak drive capability at same time, the more VA you'll need from P/S - either in transformer or lots of storage capacitance.
If that's the case, 60volts x 40 amps yields a 2400va transformer. Multiply by 1.5 or so for each extra identical motor you want to drive off same P/S. Or, smaller tranformer and more storage capacitance.
These are quick and dirty figures that should get you going. Surely someone with chime in with different specs which may suit your needs as well.
Just keep this in mind: It is better to be LOOKING AT having the power (and/or capacitance) in reserve than to go LOOKING FOR it at a later date.  |
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