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I am trying to build a force feedback racing wheel. I have a 250W 24v e-bike motor which I am trying to use for this project. The problem is that the motor draws too much current at the start and also while changing spin direction. I think I have already shorted out the BTS7960 motor driver (as there is continuity between the power pins) so I need to buy a new motor driver.

Ideally, the motor should not draw more than 30amps at any given time. I do not mind if the torque is affected by the current limiting. I have a current sensor that is connected to the Arduino that I use to measure current, the current drawn at startup and changing direction is well over 30amps.

I am new to all of this so I appreciate any help

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  • \$\begingroup\$ How do you know you are drawing too much current? \$\endgroup\$
    – Voltage Spike ♦
    Commented Jun 1, 2022 at 16:45
  • \$\begingroup\$ I have a current sensor in series with the motor. It sends the current reading to the Arduino. \$\endgroup\$
    – user249356
    Commented Jun 1, 2022 at 16:51
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    \$\begingroup\$ "I have a current sensor that is connected to the Arduino" - which current sensor, and how is it connected? What is the motor power supply? \$\endgroup\$
    – Bruce Abbott
    Commented Jun 1, 2022 at 17:51
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    \$\begingroup\$ It is the motor controller's job to limit the current. If you need other current limits, you must modify the controller itself. Adding a separate circuit only for current limiting is not a practical option. If you want to modify the controller, please provide a schematic, if you want to build a controller, you may look for existing solutions to start with. We can help tuning it. \$\endgroup\$
    – Jens
    Commented Jun 1, 2022 at 20:55

1 Answer 1

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You're probably seeing the starting surge of the motor, which can be several times the running current. You've already got an Arduino and the BTS7960 has a PWM input, so try ramping up the current instead of going full-off to full-on.

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