Subject:
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Re: 9v Gear Motors
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Newsgroups:
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lugnet.robotics
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Date:
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Fri, 9 Jun 2000 21:53:10 GMT
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Original-From:
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John Barnes <BARNES@spamcakeSENSORS.COM>
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Viewed:
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665 times
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I am very surprised to learn that the coded speed control function
actually uses "on" and "off" rather than "on" and "float". When the motor
is turned "on", it speeds up, consuming substantially more power than
it will once it reaches its final full speed because it is transfering
energy to its flywheel amonst other things.
When the motor is "float"ed, it is the flywheel energy that is then used
and which slowly runs down until the motor is again supplied with power.
The pulse power function incorporated in the RCX is just that. It is
not a speed control, it is a power control, so a lightly loaded motor
will not slow down much as the power is reduced. But a mechanically
loaded motor will slow noticably as the power level is reduced.
If you "off" or "brake" the motor between "on" periods, you are actually
dumping the stored energy and disposing of it as heat in both the motor
and the drive electronics. So if you use this method, you will be wasting
a lot of valuable battery power. If you want something that goes slowly,
gear the motor down to the desired speed.
JB
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