Machine Construction Constant of DC Motor Formula

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Constant of Machine construction is a constant term which is calculated separately to a make calculation less complex. Check FAQs
Kf=Vs-IaRaΦN
Kf - Constant of Machine Construction?Vs - Supply Voltage?Ia - Armature Current?Ra - Armature Resistance?Φ - Magnetic Flux?N - Motor Speed?

Machine Construction Constant of DC Motor Example

With values
With units
Only example

Here is how the Machine Construction Constant of DC Motor equation looks like with Values.

Here is how the Machine Construction Constant of DC Motor equation looks like with Units.

Here is how the Machine Construction Constant of DC Motor equation looks like.

1.1355Edit=240Edit-0.724Edit80Edit1.187Edit1290Edit
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Machine Construction Constant of DC Motor Solution

Follow our step by step solution on how to calculate Machine Construction Constant of DC Motor?

FIRST Step Consider the formula
Kf=Vs-IaRaΦN
Next Step Substitute values of Variables
Kf=240V-0.724A80Ω1.187Wb1290rev/min
Next Step Convert Units
Kf=240V-0.724A80Ω1.187Wb135.0885rad/s
Next Step Prepare to Evaluate
Kf=240-0.724801.187135.0885
Next Step Evaluate
Kf=1.13551584176047
LAST Step Rounding Answer
Kf=1.1355

Machine Construction Constant of DC Motor Formula Elements

Variables
Constant of Machine Construction
Constant of Machine construction is a constant term which is calculated separately to a make calculation less complex.
Symbol: Kf
Measurement: NAUnit: Unitless
Note: Value can be positive or negative.
Supply Voltage
Supply Voltage is the input voltage being fed to the dc motor circuit.
Symbol: Vs
Measurement: Electric PotentialUnit: V
Note: Value should be greater than 0.
Armature Current
Armature Current DC motor is defined as the armature current developed in an electrical dc motor due to the rotation of rotor.
Symbol: Ia
Measurement: Electric CurrentUnit: A
Note: Value can be positive or negative.
Armature Resistance
The Armature Resistance is the ohmic resistance of the copper winding wires plus the brush resistance in an electrical dc motor.
Symbol: Ra
Measurement: Electric ResistanceUnit: Ω
Note: Value should be greater than 0.
Magnetic Flux
Magnetic flux (Φ) is the number of magnetic field lines passing through the magnetic core of an electrical dc motor.
Symbol: Φ
Measurement: Magnetic FluxUnit: Wb
Note: Value should be greater than 0.
Motor Speed
Motor Speed is the speed of the rotor(motor).
Symbol: N
Measurement: Angular VelocityUnit: rev/min
Note: Value can be positive or negative.

Other formulas in DC Motor Characteristics category

​Go Back EMF Equation of DC Motor
Eb=nΦZN60n||
​Go Supply Voltage given Electrical Efficiency of DC Motor
Vs=ωsτaIaηe
​Go Armature Current given Electrical Efficiency of DC Motor
Ia=ωsτaVsηe
​Go Armature Torque given Electrical Efficiency of DC Motor
τa=IaVsηeωs

How to Evaluate Machine Construction Constant of DC Motor?

Machine Construction Constant of DC Motor evaluator uses Constant of Machine Construction = (Supply Voltage-Armature Current*Armature Resistance)/(Magnetic Flux*Motor Speed) to evaluate 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 Kf symbol.

How to evaluate Machine Construction Constant of DC Motor using this online evaluator? To use this online evaluator for Machine Construction Constant of DC Motor, enter Supply Voltage (Vs), Armature Current (Ia), Armature Resistance (Ra), Magnetic Flux (Φ) & Motor Speed (N) and hit the calculate button.

FAQs on Machine Construction Constant of DC Motor

What is the formula to find Machine Construction Constant of DC Motor?
The formula of Machine Construction Constant of DC Motor is expressed as Constant of Machine Construction = (Supply Voltage-Armature Current*Armature Resistance)/(Magnetic Flux*Motor Speed). Here is an example- 11.23214 = (240-0.724*80)/(1.187*135.088484097482).
How to calculate Machine Construction Constant of DC Motor?
With Supply Voltage (Vs), Armature Current (Ia), Armature Resistance (Ra), Magnetic Flux (Φ) & Motor Speed (N) we can find Machine Construction Constant of DC Motor using the formula - Constant of Machine Construction = (Supply Voltage-Armature Current*Armature Resistance)/(Magnetic Flux*Motor Speed).
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