Jan Steinman via EV wrote:
Keep in mind that many high-speed motors are designed or adjusted to operate
optimally in one direction. The brush location is “advanced” so that the
magnetic field is at the optimum location for a particular direction and speed.
Running such a motor in reverse often results in arcing or poor performance.
Of course, if the motor was already intended for bi-directional use, it is
probably timed neutral, and there’s no problem.
I think he said he was using a car seat adjustment motor. They need to
run equally well in both directions, so the brushes are probably at
neutral position. Besides, at 12v brush advance and arcing isn't much of
a problem.
The main concern I have is that a seat adjustment motor is only built
for intermittent duty, and would overheat if run for more than a minute
or so. And, the gears are also likely to be designed for a short life.
The manufacturer doesn't expect it to run more than a few seconds per day.
Something like a windshield wiper motor may be a better candidate. They
are meant to run continuously, so the motor and its gear train have to
be a bit more robust.
--
The problem in this business isn't to keep people from stealing your
ideas: It's to *make* them steal your ideas! -- Howard Aiken
--
Lee Hart, 814 8th Ave N, Sartell MN 56377, www.sunrise-ev.com
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