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Topic-icon Motor Not Achieving Rated RPM

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10 months 5 days ago #29534168 by Gabriel_Isko
If you can't get the rated RPM from the motor at full power in open loop, there are only two possible things that could be going on: either you are not operating it at the rated voltage, or the controller is commutating improperly. Our trapezoidal mode simply switches current based on the output of hall sensors. If the motor isn't achieiving proper commutation, the only way this is possible in open loop is if the hall sensors are misaligned. We will have to verify that using an oscilloscope.

If you have the datasheet for your motor please share it, along with a backup of the configuration settings on your controller. Also, let me know which controller model and firmware you are using.

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10 months 4 days ago #29534173 by Erik
Replied by Erik on topic Motor Not Achieving Rated RPM
Is it possible that the signal is disturbed in the open print to connect the hall-wires?

Or the hallcables themself can be the problem if they're not shielded/soldered /connected well?

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10 months 2 days ago #29534174 by Gabriel_Isko
Yes, that is very likely actually. It is actually very common for them to be wired incorrectly relative to the brushless motor phases.

If the controller isn't commutating correctly, it will draw an excessive amount of current at no load. You can check the current drawn by the motor as well as the battery current draw of the controller from the run tab of Roborun+.

If the motor is drawing very little current (<1 amp) at a constant speed, then there is another issue, probably related to the voltage output of our controller.

If there is a datasheet for the motor you are using, it would be very useful. We can check exactly what settings and setup you will need for that motor, and possibly even test a similar motor in our lab.

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