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I am trying to study/learn mathematical modelling of a DC motor i came across an equation which is known as the mechanical equation for an armature-controlled DC motor

I have understood other parameters in this equation but i am confused by the highlighted "b" term , what is meant by it?

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The b represent the drag/viscous coefficient of the motor

http://www.pitt.edu/~qiw4/Academic/MEMS1082/DCmotors.pdf

2.2 The mechanical equations Let us now deal with the mechanical representation of the motor. It has been shown in Section 1.2 that the motor exerts a torque, while supplied by voltages on the stator and on the rotor. This torque acts on the mechanical structure, which is characterized by the rotor inertia J and the viscous friction coefficient F. It has also to be taken into account that

Also:

Viscous damping in BLDC

DC motor differential equation

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  • \$\begingroup\$ is ''b'' the same thing viscous friction coefficient"F" ?? \$\endgroup\$
    – DSP_CS
    Commented Aug 29, 2019 at 11:36
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    \$\begingroup\$ Yes it is. If you look at the placement of the variable and the intent of the equation it is producing the same effect: subtraction of a torque which is proportional to rotor velocity \$\endgroup\$
    – user16222
    Commented Aug 29, 2019 at 11:39

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