Electronic VFDs/servos/etc today are 97-98% efficient.
Musk says the stuff is 98%, and I totally believe it.
Its also why modern servo motors dont need a lot of cooling, in CNC
mills (sold by hundreds of thousands every year).
And last essentially nearly forever.
Low loss = low heat = longevity.
My bridgeport M-head 3-phase motor, 1/2 hp, is 18 kg.
Circa 1950. Runs perfectly.
Today, my 2.5 kW brushless AC servo motor on lathe spindle, can run 24x7
for 10.000 hours, is == 5 kg.
6 times the power, 20 x the energy density.
No fan needed.
The electronic commutation takes in x voltage, chops it and converts it
to y voltage, then delivers it.
Does not really matter what you start or end up with, except that higher
voltage is better when the power levels start getting high.
Loss is about 2-3% total.
(Timing) Belt drives == 97-98%% efficient.
Marine gearboxes lose about 10-20%.
That why they make a lot of heat (=losses) and need large coolers for
the hydraulic fluid.
*Any heat* is a loss.
A perfect drive creates no heat (or noise).
On 08/05/2015 21:14, billhopen@yahoo.com [electricboats] wrote:
> the thing i don't get is how(or why) it takes 220 volt current and
> charges the battery at 400V? must be stepped up and rectified at a
> loss, then to use it, it goes through a step down and inverter at
> another loss...and then theres also the loss of charging a
> battery....I wonder how many KWH's you put in to get one KWH
> back...how efficient is this electro econmically?
--
-hanermo (cnc designs)
Posted by: Hannu Venermo <gcode.fi@gmail.com>
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