Rather you model the motor (PM magnetic field motor) as Applied armature voltage = Ia*Ra + K*RPM. You do not describe the motor as having a stead-state resistance of 48 ohms because it is not an informative measure. (2) Lock the rotor, apply full rated voltage for a very short time, and measure the current, and applied voltage.īasically the initial starting current from 0 RPM is what you measure in (2) above. If you want to include the brush and brush contact resistance, then make the voltage measurement between the wires embedded in the brushes. Put the voltmeter probes directly on the centered segments and not touching the brushes to measure the armature voltage drop. Position the rotor so that the brushes have commutator segments centered under the brushes. (1) Lock the rotor, apply a known direct current of about full rated current via the brushes thru the armature, and with a DC low voltage meter measure the voltage drop across the armature. You can attempt to measure the DC resistance of the armature of a DC motor with an instrument as Zog mentioned. You need some background theory on DC machines. What you want to accomplish is not clear.
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