the next thing to look at could be whether running a belt drive could also
aid in power transmission. no slack=no power sag when you twist your
throttle
measure the weight of your rear wheel, sprockets, disks, chains etc, and you
could use an equation to find out how much horse power is used to turn all
this at certain tourque/rpm measures
http://www.ajdesigner.com/phphorsepower/horsepower_equation_rotating_horsepower.php
they could help you out
Message: 3
Date: Sun, 11 Mar 2007 14:29:28 EDT
From: [EMAIL PROTECTED]
Subject: [ElectricMotorcycles] Motor Load and DriveLine Losses -
Observations and Questions
To: ListServ@electricmotorcycles.net
Message-ID: <[EMAIL PROTECTED]>
Content-Type: text/plain; charset="us-ascii"
There is thread on the EVDL about what are the normal drive-line losses in
a
Front Wheel Drive car. It got me thinking, so I put the Ninja un the
center
stand and did some tests for you to comment on.
Test 1 - Bike on center stand, measured motor amps, falls quickly to ~29.5
amps at about 1500 rpms. Is this normal?
Test 2 - Bike on center stand, removed read disk brake, no change in motor
amps consumed. So far so good.
Test 3 - Bike on center stand, removed all drive line loads (e.g. no
chain
or rear wheel or bearing losses) 19.5 amps. This seems to be a lot just
to
turn over the ADC 6.7" motor?
Things noted during the tests....
- I can turn the motor with my hand on the shaft with moderate effort. It
doesn't turn as easy I thought.
- the motor makes a small squeaking noise when (un powered by hand)
turning
slowly. Is this sound the brushes rubbing or do I need to suspect
bearings? I
don't suspect any issues, just curious.
- I found that the chain was too tight and the alignment is not perfect. I
have some motor mount bolts that need to be addressed to get the alignment
perfect.
Any thoughts of suggestions appreciated. Any other tests that I should
try?
Mike Bachand
Denver Electric Vehicle Council (DEVC) - Colorado Chapter of the EAA
1994 Kawasaki Ninja EV
Message: 4
Date: Sun, 11 Mar 2007 17:03:07 -0400
From: "BadFishRacing" <[EMAIL PROTECTED]>
Subject: Re: [ElectricMotorcycles] Motor Load and DriveLine Losses
-Observations and Questions
To: "ElectricMotorcycles" <listserv@electricmotorcycles.net>
Message-ID: <[EMAIL PROTECTED]>
Content-Type: text/plain; charset="iso-8859-1"
I've tried similar things with my twin etek setup. Started with just the
motors spinning. Then added the transmission. Then added the rear wheel.
No one thing was a big amp drag, but they all add up. So I think all is
well.
But one thing I also notice is that with the brushes removed (easy to do
on the etek), the motor turns over a lot easier by hand. I'd say there's
more drag due to the brushes than the bearings, etc. Don't know if you
could do the same, pop the springs off of the brushes. And Yes, I've got
squeaking from the brushes too.
Plus realize that you're powering the series field, even with no load on
the motor.
Darin
BadFishRacing
------------------------------
Message: 6
Date: Mon, 12 Mar 2007 10:08:40 EDT
From: [EMAIL PROTECTED]
Subject: Re: [ElectricMotorcycles] Motor Load and DriveLine Losses
-Observations and Q...
To: listserv@electricmotorcycles.net
Message-ID: <[EMAIL PROTECTED]>
Content-Type: text/plain; charset="us-ascii"
Thanks For the input Darin.
I guess in all the data I forgot some conclusions.
1) Unlike the car folks, dragging disks (assuming a properly aligned rear
wheel) don't seem to be much of an issue on an electric motorcycle.
2) Despite my search for a range killer in my direct drive line the
chain,
wheel bearings etc. account for only 10 amps or so and that seems
acceptable.
- Mike B.
Mike Bachand
Denver Electric Vehicle Council (DEVC) - Colorado Chapter of the EAA
1994 Kawasaki Ninja EV
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