is the production of electricity from a stepper motor just one of the methods ?

[Mylinux]

is the production of electricity from a stepper motor just one of the
methods ?

I need to produce 12V~ 24V 50 W. can u recommend one?



I can't think the better English grammar for this question.

 

[Unbeliever]

is the production of electricity from a stepper motor just one of the
methods ?

I need to produce 12V~ 24V 50 W. can u recommend one?

I can't think the better English grammar for this question.

A mains operated power supply would be a good choice. If you definitely
need to convert rotational motion into energy consider a car
alternator/generator. A large permanent magne stepper motor would be an
expensive alternative. Note that there are stepper motors that are not
permanent magnet types (e.g. variable reluctance stepper motors), much less
suitable to power generation.

Alf Katz
[email protected]

 

[Alex Gibson]

is the production of electricity from a stepper motor just one of the
methods ?

I need to produce 12V~ 24V 50 W. can u recommend one?



I can't think the better English grammar for this question.

I think the best method would be an exercise bike with a small alternator attached.
You could use an alternator from a car.
What you attach the leads to is up to you
but I'm sure the newsgroup could provide some suggestions.

Just have to make sure you pedal at a steady rate.

Alex

 

[Jim Thompson]

I think the best method would be an exercise bike with a small alternator attached.
You could use an alternator from a car.
What you attach the leads to is up to you
but I'm sure the newsgroup could provide some suggestions.

Just have to make sure you pedal at a steady rate.

Alex

I'm drawing a blank right now on the brand name, but maybe 25 years
ago I worked on the design of an exercise bicycle that used an
alternator both as a variable work load and also provided the power
for the bicycle electronics... pulse, breathing rate, miles traveled,
work performed, etc.

I do remember it used a Delco alternator since they utilize a slightly
magnetized rotor, allowing self-starting without a battery source.

...Jim Thompson

 

[Jeff]

I do remember it used a Delco alternator since they utilize a slightly
magnetized rotor, allowing self-starting without a battery source.

...Jim Thompson
--

That GM magnatized rotor actually is enough to get a car running with out a
battery - I found that out when driving down a road, and my car suddenly
started bogging out severly and had almost no power. The engine stalled (or
I shut it down to do a quick restart to reset the computer) while shifting
gears and I was left with no lights, heat, radio, etc. I popped the
clutch - nothing. I dropped it down to first gear around 50 km/h and popped
the clutch - everthing started to work again. Upon pulling off on a side
street, looking at the main power feeds on the starter to see if any were
corroded, along with the ground straps, I discovered that the battery cable
lug was broken underneath the plastic from moving around (let's just say I
put a larger battery in and I never got around to modifying the hold down
until after this problem).

 

[Jim Thompson]

That GM magnatized rotor actually is enough to get a car running with out a
battery - I found that out when driving down a road, and my car suddenly
started bogging out severly and had almost no power. The engine stalled (or
I shut it down to do a quick restart to reset the computer) while shifting
gears and I was left with no lights, heat, radio, etc. I popped the
clutch - nothing. I dropped it down to first gear around 50 km/h and popped
the clutch - everthing started to work again. Upon pulling off on a side
street, looking at the main power feeds on the starter to see if any were
corroded, along with the ground straps, I discovered that the battery cable
lug was broken underneath the plastic from moving around (let's just say I
put a larger battery in and I never got around to modifying the hold down
until after this problem).

On the open-battery condition, yep.

The magnetized rotor has a draw-back, but GM calls it a "feature"...
daytime headlamps to absorb the unregulated output that results from
the magnetized rotor ;-)

...Jim Thompson

 

[Jeff]

On the open-battery condition, yep.

The magnetized rotor has a draw-back, but GM calls it a "feature"...
daytime headlamps to absorb the unregulated output that results from
the magnetized rotor ;-)

The excess current produced by this magnetized rotor is small, unless the
engine is up in the 5000 - 7000 rpm range (most older GM engines are not
revved beyond 3000 rpm under normal conditions), even then it's not much.
The ign system, Computer, 6 injectors and especially the MAF sensor is more
then enough to drain this current in my car without daytime running lights.
In a old car without a computer system (including a computerized feedback
carb), this bit of magnetism might put a little excess strain on the battery
(breaking down the water - commonly called boiling the battery due to the
hissing sound), especially back then a typical lifetime for a battery was
about 4 years. My father has a old work van that is only the basics (carb
and ign, no DRLs) from 1984 and surprisingly enough, the voltage is well
regulated to a stable 13.8 V under only ign system load to full lights and
front and rear heater blower motors going full blast. The last battery
lasted about 7 years. These days the engine management systems, climate
control systems, DRL's etc keep more then enough load on the alternator. One
not so interesting part about GM is that their vehicles are increasingly
getting crappier as they try to cheapen designs as much as possible and
switch to imported sources for their parts. My old 1985 MPFI Chev (GM
division) Camaro is very reliable, required very little maintenance, even
with the extreme abuse I put on it at times (I did manage to blow a
synchronizer in the transmission on 2nd gear which took about 4 hours total
to fix, and I did rip a bracket off the rear end due to extreme abuse and
rust). It's age is really starting to show (very hash winters here that love
to eat metal - refinishing a car every so often takes its toll, and a lot of
little things are starting to need replacement) so I will be replacing it
likely next spring/summer. It's replacement won't be a newer GM.

Jeff (former nic "Da Man")