+1.
As I have commented in the past, better tech makes for lower losses.
My circa 1950 Bp 3-phase motor is 18 kg mass, and 1/2 Hp output.
Excellent, near silent.
My 2014 china Ac servo is 2.5 kW, 15 kg.
Excellent, near silent.
800% difference.
The Bp is low-temp and thus long-lived because it has a lot of mass and
area to dissipate heat.
The new servo is low temp and long lived because it is very, very efficient.
At 8x the power density, it does not get hot at all.
The servo controller sometimes uses the integral fan, in hot temps (30C+).
The more heat sinking you need/use, the more losses you have.
Heat is a loss.
Noise is a loss.
On 06/10/2016 16:03, king_of_neworleans wrote:
> What they said. And what you said. If you are running at higher power
> levels, you should have a heat sink of some kind. An ordinary finned
> aluminum heat sink will work fine if you have good ventilation past
> it. A muffin fan is a very small electrical load and will help
> further. A nice big blower hitting both the controller case and the
> heat sink would be even better. My "heat sink" is just an aluminum
> plate but I usually run at 15a or less, and my ER is fairly open and
> well ventilated. I have never had my Kelly controllers shut down on
> overtemp and I have occasionally ran at full power for several minutes
> at a time. YMMV. The Sevcon units look more compact and so they are
> probably a little more dependent on heat sink / cooling. Plus the
> Kelly units I have used have shallow cooling fins on the case.
--
-hanermo (cnc designs)
Posted by: Hannu Venermo <gcode.fi@gmail.com>
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