Re: Power Supply Calculations

Is there a secret hand shake I'm not aware of? <just kidding>. I
was thinking about this and wondering if I'd be better off using 3
seperate power supplies rathar than one large one. Can anyone please
help?
Mark

--- In CAD_CAM_EDM_DRO@yahoogroups.com, "natchamp_87" <mark@h...>
wrote:

> Ok guys, I'm switching gears on my project and need some help.
> Previously, I was going to use some AC drives for my brushless
> motors so I didn't need a separate power supply. Now I do
> because I recently purchased some WorldServo drives (so I can use
> step/dir software) and need to figure out what power supply to

use.

> I'm having problems figuring it out. My project is retrofitting
> a Bridgeport M-head. My motors are probably a little overkill so I
> know I don't need to max them out.
>
> Using the formula of Amps = 2/3rd of the motors rated amps I come

up

> with the following
>
> Motor RMS is 7.5, so 7.5*.6666 = 5amps However, do I triple this
> (for all 3 motors) to obtain the whole power supply rated amps
> requirements?
>
> The voltage part of the equation is hard for me because I don't
> know what motor spec to use to multiple by 3.
>
> Here are some of the specs for my motors:
> Stall torque 780oz
> Peak torque 2,000 oz
> Rated power 1,400 watts
> Const stall current 10.6A peak
> Const stall current 7.5A rms
> BEMF constant 62 volts peak/krpm
> Resistance 25c 1.2 ohms
> Inductance 3.8 mH
> Recommend bus Voltage 320 VDC
>
> Can anyone shed some light on determining what power supply I

need?

> Thanks a bunch.
>
> Mark