It will of course work if the brushless motor is activated in some way,
perhaps an exiter circuit, if one is needed.
Or on some Pm as-is motors, I think.
Any or most DC brushed motors, like steppers, like DC brushed servos,
act as generators.A DC treadmill motor = generator. I have 10.
The V/rpm constant tells you what volts You get, +/-.
But brushless -- depends.
It will not be very efficient imo.
But it actually might be as-efficient, or nearly, or better, than
some/most commercial offerings.
Most commercial offerings are not efficient at all.
Almost all commercial offerings are more badge-engineered, and
cost-engineered, since efficiency has never been important to consumers
in general, in terms of buying decisions.
This is easy to see.
Any DIY effort, using top-end expensive specialist kit geared to labs
and efficiencies, will be much more efficient than any commercial
product on the market.
But it will be very much more expensive.
All steppers are brushless and put out power. Fairly efficient.
My AC brushless servos do not.
I suspect a tiny tricle of current could use them as generators.
Theory says so.
They are probably VASTLY more efficient than any generator You can buy.
Since they are exceedingly efficient in delivering power, at 14x the
power/mass/size vs a very-high-end old 3-phase industrial motor.
Or about 3-5x better than any common DC-PM or AC-3phase motor today, in
terms of efficiency, imho.
How do I know ?
They are smaller by size, by mass, and generate very much less heat / kW.
All losses turn to heat.
My BP M-head, 0.5 Hp, = 18 kg.
My AC servo, 2.5 kW cont, 24x7, == 12 kg. 1/4-1/5 the size by volume.
So;
The DC generator You can buy, will be ok, but so-so technically due to
cost engineering.
Any kit You cobble together is likely to be about the same - and
potentially significantly better or worse in terms of efficiency.
The real issue is longetvity and reliability.
Anyone can make a better system, a more robust system, a more efficient
system with some engineering experience.
But it will be bigger and more expensive.
On 24/05/2017 17:40, king_of_neworleans wrote:
> I was recently asked this question by a neighbor, as we discussed pros
> and cons of electric drive and practical regen yields under sail. He
> asked if he could just turn a brushless motor with a small diesel or
> gas engine, and use an ordinary drive motor controller in regen mode
> to charge a battery bank. I told him I don't see why not, but I had no
> idea whether this could be done efficiently or not, compared to a
> purpose built DC generator. I know it would work, but how well would
> it work? Much better than an alternator, I would imagine, but I have
> doubts that it would perform as well or better than a straight DC
> generator. Anybody want to weigh in on this, with actual knowledge?
> Experience?
--
-hanermo (cnc designs)
Posted by: Hannu Venermo <gcode.fi@gmail.com>
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