electric_vehicle_lover Posted April 12, 2016 Share Posted April 12, 2016 My good cheap generic EUC that I use for the firmware development, sometimes when I take it for a ride, the motor makes noise as if the power is being cut when I try to accelerate... I can balance on it but can't accelerate as the motor don't and starts making the noise... and if I try run over a small dump, I will fall. I tried the connect well the motor phases and hall sensors... as I am always unconnecting them for the firmware development. This happens the battery is fully charged or with middle charge. I just can think on a bad circuit, for the current and/or over current but would be strange because the problem happens just sometimes, not always. The problem may disappear some hours or day later, without doing nothing. Link to comment Share on other sites More sharing options...
Paco Gorina Posted April 12, 2016 Share Posted April 12, 2016 Could be a bad contact? Link to comment Share on other sites More sharing options...
electric_vehicle_lover Posted April 12, 2016 Author Share Posted April 12, 2016 I think no because I tried many times to connect again the cables. Also the motor works well at low speed, I can balance and ride at low speeds. Link to comment Share on other sites More sharing options...
MetricUSA Posted April 12, 2016 Share Posted April 12, 2016 Does it make grinding noises when you spin wheel while off? Bearings can go bad...or maybe your firmwear...? Link to comment Share on other sites More sharing options...
electric_vehicle_lover Posted April 13, 2016 Author Share Posted April 13, 2016 The motor do not make noise when I spin the wheel - mechanical, it all seems to be ok. Also my firmware can run the motor at max speed without any noise (I get the same noise if I limit the current to a very low value like 1A and block the wheel by hand, using my fiirmware). Link to comment Share on other sites More sharing options...
lizardmech Posted April 13, 2016 Share Posted April 13, 2016 Pretty sure the rotor is going out of sync with the rotating magnetic field. Because it lacks torque the rotor falls behind where the MCU assumes it will be. Usually electric motors are geared down to the point it's nearly impossible to stall and desync the motor in normal use. Link to comment Share on other sites More sharing options...
electric_vehicle_lover Posted April 17, 2016 Author Share Posted April 17, 2016 On 4/13/2016 at 1:22 PM, lizardmech said: Pretty sure the rotor is going out of sync with the rotating magnetic field. Because it lacks torque the rotor falls behind where the MCU assumes it will be. Usually electric motors are geared down to the point it's nearly impossible to stall and desync the motor in normal use. Sorry but I didn't understand. Do you think is there anything I can do? Link to comment Share on other sites More sharing options...
lizardmech Posted April 18, 2016 Share Posted April 18, 2016 6 hours ago, electric_vehicle_lover said: Sorry but I didn't understand. Do you think is there anything I can do? All you can do is increase the strength of the magnetic field by increasing current, or reduce the needed torque by using reduction gearing. Direct drive EUCs are basically too close to the torque limit of their motors in many cases. Link to comment Share on other sites More sharing options...
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