This page (revision-54) was last changed on 2021-10-02 05:56 by Murray Altheim

This page was created on 2021-03-29 18:18 by Murray Altheim

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Page References

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Mars Rover
MarsRover

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At line 21 added one line
!! Motor Options
At line 23 added 18 lines
I've found three potential suppliers of motors. It's unclear exactly at this point what my unloaded speed (RPM) and torque (oz-in or kg-cm) should be to support the robot at a reasonable target velocity. The NASA Mars rovers move very slowly, for reasons due to the communication distance to and from Mars, caution (no repairs possible), etc. I'd like the new robot to have roughly the same top speed as the KR01, so I'm basing the new spec on that of the 9V OSEPP 25mm DC motors, about 60m in length, with 8500RPM motors geared down 45:1 to 189RPM. I can't find a torque rating but we'll assume that a motor in that ballpark or maybe a bit stronger would be okay. I'll have to do some tests on the KR01 to actually measure its top speed.
So the options I've found so far are, noting that the ''actual'' motor choice remains to be determined:
TBD
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__Notes__ \\
The motors should be either 9V or 12V as I'll likely be running off a 12V battery. They'll need built-in encoders. Only the ServoCity motors have ball bearings on the output shafts, the rest are (likely) bronze bushings. The OSEPP is included for reference only, as the encoders require a specialised mount that will be impossible in this robot and are only sold as a kit with a wheel and tire. Published torque ratings are suspect in some cases, posted as published. ServoCity specs are more precise than represented here (e.g., gear ratio and encoder CPR are to three decimal places).
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This page (revision-54) was last changed on 2021-10-02 05:56 by Murray AltheimTop