Subject:
|
Re: brake
|
Newsgroups:
|
lugnet.robotics
|
Date:
|
Wed, 21 Aug 2002 23:02:47 GMT
|
Original-From:
|
T. Alexander Popiel <popiel@SAYNOTOSPAMwolfskeep.com>
|
Viewed:
|
764 times
|
| |
|
|
In message: <F005CD411D18D3119C8F00508B08748009CEAD17@ehubunt100.eth.ericsson.
se>
"Laszlo Meszaros (ETH)" <Laszlo.Meszaros@eth.ericsson.se> writes:
> > Motor speed is generally best governed by pulse-width modulation
> > via rapid on/brake switching, although some people will argue for
>
> how does the RCX motor output like the rapid on/brake switching?
I've never had particular problems with it. At high frequencies
it can consume a bit extra battery power (I think due to pushing
magnetic field coils through higher-current transient states).
At worst, it's halved the battery life of the unit. For me, this
isn't a big deal.
> during the brake cycles there are short-circuit currents flowing
> through the switching element off the motor control cirtuitry.
I haven't looked at the circuitry in detail, but I would be very
surprised if there were actual short-circuits during the brake
cycle, particularly since brake is the default state of a motor
under the standard firmware. Yes, higher-than-normal currents
from the collapse of the braking magnetic fields flow through the
unit, but this is true whenever you turn off braking. I'd be
quite surprised if these currents came even close to the circuit
tolerances...
- Alex
|
|
1 Message in This Thread:
- Entire Thread on One Page:
- Nested:
All | Brief | Compact | Dots
Linear:
All | Brief | Compact
|
|
|
|
