400Hz Power...

[cmmorgan60]

Are there any add heat consideration when using 400Hz AC power? Over and above what one encounters with 60Hz power.

Thanks,
Chris

 

[bob]

Yes. The resistance is higher at 400 cycles.

 

[spsnyder]

Impedance has two components, resistance and reactance. Resistance is constant for a wire, reactance increases with frequency. Check out Chapter 9, Table 9. Gives values of reactance at 60 hz specifically. That value is dependent on frequency.

 

[drbond24]

Somebody's going to say it, so it might as well be me:

the resistance is the same; it is the impedance that will be higher at larger frequencies.

Edit: I was beaten to the punch while typing my post!!

 

[zog]

Plus you have additional heat from hysterysis losses.

 

[rattus]

Sure but:

Sure but:

Plus you have additional heat from hysteresis losses.

Sure Zog, but we have far less iron with 400Hz. Wouldn't that be a wash?

 

[bob]

Somebody's going to say it, so it might as well be me:

the resistance is the same; it is the impedance that will be higher at larger frequencies.Edit: I was beaten to the punch while typing my post!!

The resistance of a conductor is higher at 400 hz that it is at 60 hz. The reason is skin effect. It has more effect on larger conductors than small conductors.
http://www.allaboutcircuits.com/vol_2/chpt_3/6.html