Machine Construction Constant of DC Motor Calculator

✖Supply Voltage is the input voltage being fed to the dc motor circuit.ⓘ Supply Voltage [V_s]			+10% -10%
✖Armature Current DC motor is defined as the armature current developed in an electrical dc motor due to the rotation of rotor.ⓘ Armature Current [I_a]			+10% -10%
✖The Armature Resistance is the ohmic resistance of the copper winding wires plus the brush resistance in an electrical dc motor.ⓘ Armature Resistance [R_a]			+10% -10%
✖Magnetic flux (Φ) is the number of magnetic field lines passing through the magnetic core of an electrical dc motor.ⓘ Magnetic Flux [Φ]			+10% -10%
✖Motor Speed is the speed of the rotor(motor).ⓘ Motor Speed [N]			+10% -10%

✖Constant of Machine construction is a constant term which is calculated separately to a make calculation less complex.ⓘ Machine Construction Constant of DC Motor [K_f]

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Machine Construction Constant of DC Motor Solution

STEP 0: Pre-Calculation Summary

Formula Used

Constant of Machine Construction = (Supply Voltage-Armature Current*Armature Resistance)/(Magnetic Flux*Motor Speed)
K_f = (V_s-I_a*R_a)/(Φ*N)
This formula uses 6 Variables

Variables Used

Constant of Machine Construction - Constant of Machine construction is a constant term which is calculated separately to a make calculation less complex.
Supply Voltage - (Measured in Volt) - Supply Voltage is the input voltage being fed to the dc motor circuit.
Armature Current - (Measured in Ampere) - Armature Current DC motor is defined as the armature current developed in an electrical dc motor due to the rotation of rotor.
Armature Resistance - (Measured in Ohm) - The Armature Resistance is the ohmic resistance of the copper winding wires plus the brush resistance in an electrical dc motor.
Magnetic Flux - (Measured in Weber) - Magnetic flux (Φ) is the number of magnetic field lines passing through the magnetic core of an electrical dc motor.
Motor Speed - (Measured in Radian per Second) - Motor Speed is the speed of the rotor(motor).

STEP 1: Convert Input(s) to Base Unit

Supply Voltage: 240 Volt --> 240 Volt No Conversion Required
Armature Current: 0.724 Ampere --> 0.724 Ampere No Conversion Required
Armature Resistance: 80 Ohm --> 80 Ohm No Conversion Required
Magnetic Flux: 1.187 Weber --> 1.187 Weber No Conversion Required
Motor Speed: 1290 Revolution per Minute --> 135.088484097482 Radian per Second (Check conversion here)

STEP 2: Evaluate Formula

Substituting Input Values in Formula

K_f = (V_s-I_a*R_a)/(Φ*N) --> (240-0.724*80)/(1.187*135.088484097482)

Evaluating ... ...

K_f = 1.13551584176047

STEP 3: Convert Result to Output's Unit

1.13551584176047 --> No Conversion Required

FINAL ANSWER

1.13551584176047 ≈ 1.135516 <-- Constant of Machine Construction

(Calculation completed in 00.004 seconds)

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Created by Prahalad Singh

Jaipur Engineering College and Research Centre (JECRC), Jaipur

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Birsa Institute of Technology (BIT), Sindri

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< DC Motor Characteristics Calculators

Machine Construction Constant of DC Motor

LaTeX Go Constant of Machine Construction = (Supply Voltage-Armature Current*Armature Resistance)/(Magnetic Flux*Motor Speed)

Back EMF Equation of DC Motor

LaTeX Go Back EMF = (Number of Poles*Magnetic Flux*Number of Conductors*Motor Speed)/(60*Number of Parallel Paths)

Armature Current given Electrical Efficiency of DC Motor

LaTeX Go Armature Current = (Angular Speed*Armature Torque)/(Supply Voltage*Electrical Efficiency)

Supply Voltage given Electrical Efficiency of DC Motor

LaTeX Go Supply Voltage = (Angular Speed*Armature Torque)/(Armature Current*Electrical Efficiency)

Machine Construction Constant of DC Motor Formula

LaTeX Go

Constant of Machine Construction = (Supply Voltage-Armature Current*Armature Resistance)/(Magnetic Flux*Motor Speed)
K_f = (V_s-I_a*R_a)/(Φ*N)

Why Starters are used with DC motor?

Starters are used with a DC motor to restrict armature current as there is no back emf while starting.

How to Calculate Machine Construction Constant of DC Motor?

Machine Construction Constant of DC Motor calculator uses Constant of Machine Construction = (Supply Voltage-Armature Current*Armature Resistance)/(Magnetic Flux*Motor Speed) to calculate the Constant of Machine Construction, Machine Construction Constant of DC Motor is defined as a constant based on machine construction that is required to find all the basic quality of the machine. Constant of Machine Construction is denoted by K_f symbol.

How to calculate Machine Construction Constant of DC Motor using this online calculator? To use this online calculator for Machine Construction Constant of DC Motor, enter Supply Voltage (V_s), Armature Current (I_a), Armature Resistance (R_a), Magnetic Flux (Φ) & Motor Speed (N) and hit the calculate button. Here is how the Machine Construction Constant of DC Motor calculation can be explained with given input values -> 11.23214 = (240-0.724*80)/(1.187*135.088484097482).

FAQ

What is Machine Construction Constant of DC Motor?

Machine Construction Constant of DC Motor is defined as a constant based on machine construction that is required to find all the basic quality of the machine and is represented as K_f = (V_s-I_a*R_a)/(Φ*N) or Constant of Machine Construction = (Supply Voltage-Armature Current*Armature Resistance)/(Magnetic Flux*Motor Speed). Supply Voltage is the input voltage being fed to the dc motor circuit, Armature Current DC motor is defined as the armature current developed in an electrical dc motor due to the rotation of rotor, The Armature Resistance is the ohmic resistance of the copper winding wires plus the brush resistance in an electrical dc motor, Magnetic flux (Φ) is the number of magnetic field lines passing through the magnetic core of an electrical dc motor & Motor Speed is the speed of the rotor(motor).

How to calculate Machine Construction Constant of DC Motor?

Machine Construction Constant of DC Motor is defined as a constant based on machine construction that is required to find all the basic quality of the machine is calculated using Constant of Machine Construction = (Supply Voltage-Armature Current*Armature Resistance)/(Magnetic Flux*Motor Speed). To calculate Machine Construction Constant of DC Motor, you need Supply Voltage (V_s), Armature Current (I_a), Armature Resistance (R_a), Magnetic Flux (Φ) & Motor Speed (N). With our tool, you need to enter the respective value for Supply Voltage, Armature Current, Armature Resistance, Magnetic Flux & Motor Speed and hit the calculate button. You can also select the units (if any) for Input(s) and the Output as well.

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