DC motor armature power is the electrical power delivered to or developed in the armature of a DC motor. The armature is the rotating part of the motor where electrical energy is converted into mechanical energy (in the case of a motor) or vice versa (in the case of a generator). Understanding armature power is used to analyzing the performance and efficiency of a DC motor.
However, in a DC motor, the applied voltage to the motor terminals is split between the armature voltage and the voltage drop across the armature resistance. The armature voltage is influenced by the back EMF, which is the voltage generated by the motor due to its rotation. So, the power in the armature circuit can also be related to the back EMF and current.
DC Motor Armature Power Formula |
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\( P_a \;=\; V_a \cdot I_a \) (DC Motor Armature Power) \( V_a \;=\; \dfrac{ P_a }{ I_a }\) \( I_a \;=\; \dfrac{ P_a }{ V_a }\) |
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| Symbol | English | Metric |
| \( P_a \) = Armature Mechanical Power | \(W\) | \(kg-m^2\;/\;s^3\) |
| \( V_a \) = Armature Voltage | \(V\) | \(kg-m^2\;/\;s^3-A\) |
| \( I_a \) = Armature Current | \(A\) | \(C\;/\;s\) |
