From: "Lawrence Rhodes" <[EMAIL PROTECTED]>
>Well I have over heated my Currie electric bike
conversion 3 times
and my
>wife also overheated it over the course of the 2 or 3
years that we
have had
>it. It cost 600 bucks but seemed to work well on the
flats. It
however
>doesn't work well on hills which is the reason that
we have it. It
now
>after being heated up and gone into nowork mode to
save itself from
frying
>won't work at full speed anymore. Currie wouldn't
give us a new
^^^^^^^
...
>From what I understand about your post, the motor has
degraded over
time. The speed loss is permanent? This is a broken
motor, then?
So, the motor will not get up to full speed anymore.
There could be
a huge number of causes. First, since the Currie is a
brushless motor,
its speed is probably governed by a quartz crystal.
These rarely mess
up, so that shouldn't be the problem. You could have
lost some of the
paralleled MOSFET's, so the current limit kicks in
earlier. Shorted
windings could also produce a similar effect, but
shorts in BLDC motors
are kind of complicated, and perhaps Rod Hower could
make a comment on
this. Don't they create smoke and distorted torque
profiles before
they cause loss of top end speed?
One way to test if the problem is current related is
to see if the top
speed governor is still kicking in at the right time.
Try running the
bike on the flats or on a slight downhill incline. If
it does not
reach full speed, the problem is a governor issue
(unlikely). If it
does, then it is not a "won't work at full speed
anymore" problem, but
it is a "doesn't produce full power" problem.
A burned out motor, esp. out of warranty (which is
usually very short
for these experimental pre-beta type products) is
something you will
have to replace at your own expense.
Sorry about that, but you are a pioneer.
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