Hello, I have a question regarding Devantech 24V, 49:1 Gear Motor w/ Encoder.
I’m supposed to create a model for a mobile robot with two wheel motors. I did the math and found out the resistance of the motor has to be around 1.85 ohms, since the stall current is 13 and the nominal test voltage is 24.
At stall condition the rpm is zero and therefore back emf is zero, and at steady state the transient inductance effect can be neglected so R = 24/13 = 1.85 ohms.
However when i measured the motor resistance (at rest) using a multimeter it turned out to be 50.3 ohms!!!
I’m confused because the model i created for my mobile robot is showing very logical results that match both the motor and robot specs. Can someone help me figure this out?
@Samer Welcome to the RobotShop Community. There is quite a lot of material online regarding calculating motor resistance, so perhaps without going into exactly what you have measured, perhaps follow some posts just in case (could be a units problem or something small which was overlooked).
https://www.researchgate.net/post/How_can_I_measure_brushed_DC_motor_parameters_like_resistance_inductance_voltage_constant_torque_constant
etc.
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