Armature electromotive force of DC motor
Definition: Induced electromotive force in the armature winding.
1. Induced electromotive force always exists during operation
Figure 1.22 Potential and current direction in armature components when motor/generator is running. Whether the DC motor is running as a motor or a generator, an electromotive force is induced in the armature winding. This induced electromotive force refers to the electromotive force of a branch.
2. How to calculate the induced electromotive force
To calculate the branch electromotive force, you can first find the average value of the electromotive force of each component, and then multiply it by the number of series components in each branch to get the branch electromotive force.
Ce is the electromotive force constant. The above formula shows that the induced electromotive force of the DC motor is related to the motor structure, air gap flux and motor speed. After the motor is manufactured, the constant Ce related to the motor structure no longer changes, so the armature electromotive force is only related to the air gap flux and speed. Changing the speed and flux can change the size of the armature electromotive force.
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