Power supply ? and advice on motor.

[Ken_Shea]

Is there a way of knowing the DC out put using a Toroidal transformer and a bridge rectifier?

The Toroidal rating is 120vac input and 7VAC 10amp out put.
Thanks

2nd ?

Run 3phase 440V motors on 3PH 220V.
Have not picked up the unit to see if perhaps it has internal 220V
wiring options, but don't believe it does as the decal says 440V.


EDIT:
Ignore the motor ?, going to be hard to answer unless you know what exactly I have, when it is picked up and checked I'll ask then.

Thanks again.





Thanks again.

Ken

[CJL5585]

Is there a way of knowing the DC out put using a Toroidal transformer and a bridge rectifier?

The Toroidal rating is 120vac input and 7VAC 10amp out put.
--------------------------------------------------------------


The bridge Rectifier Voltage output is the 7 Volt AC times the factor 1.414.

The current capability will drop by a factor in proportion to the increase in output DC voltage.


DC output voltage:
7 x 1.414 = 9.898 Volts DC Output

Rough Output Current Calculation:
AC wattage calc: 7 VAC times 10 Amps = 70 watts of power

DC wattage rough calc: 70 Watts divided by 9.898 Volts DC = 7.072 Amps DC. after capacitor is added to circuit for filtering. Guess on Capacitor value 4700 uf @ 20 to 50 Volts DC.

Hope this helps.

[Ken_Shea]

Sure does help, that is exactly the information I was looking for, there was no capacitor in it for filtering but that should not be a too difficult addition.

Thank you

[Al_The_Man]

In most cases 440v 3 phase motors are capable of switching to 220v.
The only thing required is to increase the overloads to suit and check the current rating of any contactor and conductors.
Al.

[Ken_Shea]

That's very encouraging, especially since this drill station has four heads/motors.

Thanks Al
Ken

[Ken_Shea]

You are correct Al, got it to the shop, while it is wired 440V it is also 220 volt capable.
That was very good news!

Found 2 metric reamers under neath the base, in excellent condition, along with numerous drills, many Allen head wrenches, dozens of smaller SHCS and 4 small taps

The RPM range is 1000 to 7000, no power feed on any of the heads, no big deal on that at all, just would have been a nice extra.

Now to get some power too it and hope the bearings are not trashed.



Ken