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View Full Version : DC vs AC inverters







Josip
03-02-2006, 08:45 PM
Hello guys,

Who can tell why all inverters (Daikin, Toshiba, Hitachi) intended to work at very low outside temperature (down to -15'C) have DC motors?

frank
03-02-2006, 09:43 PM
What makes you say DC - are there any AC inverters doing the same?

As far as I know, the DC driven compressor allows better control at low loads = maybe this allows operation at -15C

Josip
03-02-2006, 10:00 PM
What makes you say DC - are there any AC inverters doing the same?

Sorry Frank, I do not know :) and for that reason I am asking that question. Hope to find out :)

Lazarus
04-02-2006, 12:49 AM
Shining do an AC Inverter.... Does anybody know the pros and cons of each type!!

Peter_1
04-02-2006, 08:10 AM
I heard once from someone experienced in VFD's that an DC motor is much easier and cheaper to control then an AC motor.

It's easier to hold a high torque an a DC motor because you can play with the field in stator and rotor.
Seen on the mass production this could hold sense.

You don't need all the electronics to generate a sine wave which gives serious noise on the net.


Rest of the post moved to the electrical section.