DC Motor Armature Voltage Formula & Calculator

Armature Voltage Va Calculation

Ka
Φ (weber)
n (rpm)

DC motor armature voltage calculator - step by step calculation, formula & solved example problem to determine the armature voltage of an electrical motor. Armature constant Ka, armature speed n in rpm & flux generated by the magnetic field φ in weber are the key elements in this calculation.

Formula

The below mathematical formula is used in this calculator to find the armature voltage of an electrical DC motor

Solved Example

The below step by step solved example problem may helpful for users to understand how the input values are being used in such calculations to find the armature voltage.
Example Problem
Find the armature voltage (Va) of DC motor whose armature constant Ka = 0.0025, armature speed n = 1500 rpm & flux generated by the magnetic field φ = 100 weber
Solution
The given data
Ka = 0.0025
armature speed n = 1500 rpm
φ = 100 weber

Step by step calculation
Formula to find Va = Ka x n x φ
substitute the values in the formula
= 0.0025 x 1500 x 100
Va = 375 volts

In the field of electrical engineering, the speed of rotor is directly proportional to armature voltage. While designing DC motor to attain a certain speed, it's essential to calculate the the armature voltage as it controls the speed. The above formula, step by step calculation & solved example problem may be useful for users to understand how the values are being used in the formula to find the DC motor armature voltage, however, when it comes to online for quick calculations, this armature voltage calculator helps the user to perform & verify such calculations as quick as possible.

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