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    Motor Speed Calculator | Quick & Accurate RPM Calculations | Motor Speed Calculator for AC and DC Motors

    Created by Md jony islam

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    Motor Speed Conversion Calculator

    Calculate motor speed based on parameters like frequency, poles, and voltage. Accurate for both AC and DC motors to determine optimal RPM. To measure motor speed, the essential parameters differ according to the type of motor. In an AC motor, the frequency of supply voltage and number of poles in the motor are critical for finding the value for synchronous speed from a formula. For a DC motor, armature voltage, armature current, armature resistance, motor constant, and magnetic flux contribute to speed generation. All these parameters have a significant impact on the motor speed, which may vary under loads or with any operational factors. Thus, it is very important to be well acquainted with these parameters, as well as their correct input, for highly accurate calculated values on motor speed.

    Motor Speed Calculator

    Motor Speed RPM Calculator
    Hz
    P
    Nₛ

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    What do you need to know to calculate Motor Speed?

    This operator-friendly machine helps you quickly estimate motor speed. This is determined on the basis of supply frequency, number of poles in the machine, and slip (for induction motors). The formula for synchronous speed is:

    In induction machines, actual speed is a little lower considering slip. This calculator is designed for the use of engineers, technicians, and students working with AC or DC motors to analyze motor performance, troubleshoot problems, or design systems. In applications such as industrial machinery, HVAC systems, or automotive systems, it provides quick and accurate calculation. Save time and improve your products with this indispensable motor speed calculator!

    🙋 Try our Shunt Current Calculator . If you want to learn more about conversions using Electrical Engineering Project Calculators.

    Conversion using the Motor Speed Calculation Formula

    How to Calculate AC Motor (Synchronous Speed):

    The synchronous speed (Nₛ) is given by the formula:

    Ns = 120 × fP

      Where:

    • Ns = Synchronous speed (RPM)
    • f = Frequency (in Hz)
    • P = Number of poles of the motor

    For Example, Suppose we have the following values for an AC motor: Frequency (f) = 50hz, Number of poles (P) = 4. Motor Speed = ?

    Ns = 120 × 504
    Ns = 60004 = 1500RPM

    How to Calculate DC Motor (Armature Speed):

    The speed of a DC motor is given by:

    N = V - Ia × RaK × ϕ

      Where:

    • N = Motor speed (RPM)
    • V = Armature voltage (V)
    • Ia = Armature current (A)
    • Ra = Armature resistance (Ω)
    • K = Motor constant (depends on the motor)
    • ϕ = Magnetic flux per pole

    For Example, Now, let's calculate the speed of a DC motor with the following values: Armature voltage (V) = 240V, Armature current (Ia) = 5A, Armature resistance (Ra) = 0.5Ω, Motor constant (K) = 0.02 (depending on the motor), Magetic flux (ϕ) = 0.1 Weber. Dc motor Spped = ?

    N = 240 - (5 × 0.5)0.02 × 0.1
    or, N = 240 - 237.50.002
    or, N = 118750 RPM

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    About the Author

    Md Jony Islam

    Md Jony Islam: Multidisciplinary Engineer & Financial Expert:

    Md. Jony Islam is a highly skilled professional with expertise in electronics, electrical, mechanical, and civil engineering, as well as finance. Specializing in transformer service and maintenance for 33/11kV substations, he ensures reliable and efficient electrical systems. His mechanical engineering skills drive innovative designs, while his financial acumen supports effective project budgeting. With a strong foundation in civil engineering, he contributes to robust infrastructure development. Md. Jony Islam's multidisciplinary approach ensures efficiency, quality, and reliability across all projects.