Number of Damper Bars Calculator

✖Pole Arc is the distance measured on the circumference of the armature from the center of one pole to the center of the next pole.ⓘ Pole Arc [θ]			+10% -10%
✖Slot pitch is the distance between two adjacent slots. In dc machines, the slot pitch usually lies between 25 to 35 mm.ⓘ Slot Pitch [Y_s]			+10% -10%

✖Number of Damper Bar provides starting torque necessary for starting the synchronous motor. It also prevents hunting of synchronous motor.ⓘ Number of Damper Bars [n_d]

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Formula

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Number of Damper Bars

Formula

`"n"_{"d"} = "θ"/(0.8*"Y"_{"s"})`

Example

`"10"="257.6m"/(0.8*"32.2m")`

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Number of Damper Bars Solution

STEP 0: Pre-Calculation Summary

Formula Used

Number of Damper Bar = Pole Arc/(0.8*Slot Pitch)
n_d = θ/(0.8*Y_s)
This formula uses 3 Variables

Variables Used

Number of Damper Bar - Number of Damper Bar provides starting torque necessary for starting the synchronous motor. It also prevents hunting of synchronous motor.
Pole Arc - (Measured in Meter) - Pole Arc is the distance measured on the circumference of the armature from the center of one pole to the center of the next pole.
Slot Pitch - (Measured in Meter) - Slot pitch is the distance between two adjacent slots. In dc machines, the slot pitch usually lies between 25 to 35 mm.

STEP 1: Convert Input(s) to Base Unit

Pole Arc: 257.6 Meter --> 257.6 Meter No Conversion Required
Slot Pitch: 32.2 Meter --> 32.2 Meter No Conversion Required

STEP 2: Evaluate Formula

Substituting Input Values in Formula

n_d = θ/(0.8*Y_s) --> 257.6/(0.8*32.2)

Evaluating ... ...

n_d = 10

STEP 3: Convert Result to Output's Unit

10 --> No Conversion Required

FINAL ANSWER

10 <-- Number of Damper Bar

(Calculation completed in 00.004 seconds)

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Created by swapanshil kumar

ramgarh engineering college (REC), ramgarh

swapanshil kumar has created this Calculator and 25+ more calculators!

Verified by Parminder Singh

Chandigarh University (CU), Punjab

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< 7 Mechanical Parameters Calculators

Armature Diameter using Output Equation

Go Armature Diameter = sqrt(Output Power/(Output Coefficient AC*1000*Synchronous Speed*Armature Core Length))

Armature Core Length using Output Equation

Go Armature Core Length = Output Power/(Output Coefficient AC*1000*Armature Diameter^2*Synchronous Speed)

Area of Field Conductor

Go Area of Field Conductor = (Full Load Field MMF*Resistivity*Length of Mean Turn)/Field Coil Voltage

Diameter of Damper Bar

Go Diameter of Damper Bar = sqrt((4*Area of Damper Winding)/pi)

Cross Sectional Area of Damper Winding

Go Cross-Sectional Area of Damper Winding = Area of Damper Winding/Number of Damper Bar

Number of Damper Bars

Go Number of Damper Bar = Pole Arc/(0.8*Slot Pitch)

Length of Damper Bar

Go Length of Damper Bar = 1.1*Armature Core Length

Number of Damper Bars Formula

Number of Damper Bar = Pole Arc/(0.8*Slot Pitch)
n_d = θ/(0.8*Y_s)

How do you calculate pole pitch?

Pole Pitch is equal to the total number of armature slots divided by the total number of poles in the machine.

How do you calculate slot pitch?

This is naturally equal to the total number of armature slots divided by the number of poles in the machine. ∴ Pole Pitch = (Number of armature slots) / (Number of poles).

How to Calculate Number of Damper Bars?

Number of Damper Bars calculator uses Number of Damper Bar = Pole Arc/(0.8*Slot Pitch) to calculate the Number of Damper Bar, Number of Damper Bars provides starting torque necessary for starting the synchronous motor. It also prevents hunting of synchronous motor, that is it reduces oscillations of the rotor when the motor deviates from synchronism. Number of Damper Bar is denoted by n_d symbol.

How to calculate Number of Damper Bars using this online calculator? To use this online calculator for Number of Damper Bars, enter Pole Arc (θ) & Slot Pitch (Y_s) and hit the calculate button. Here is how the Number of Damper Bars calculation can be explained with given input values -> 10 = 257.6/(0.8*32.2).

FAQ

What is Number of Damper Bars?

Number of Damper Bars provides starting torque necessary for starting the synchronous motor. It also prevents hunting of synchronous motor, that is it reduces oscillations of the rotor when the motor deviates from synchronism and is represented as n_d = θ/(0.8*Y_s) or Number of Damper Bar = Pole Arc/(0.8*Slot Pitch). Pole Arc is the distance measured on the circumference of the armature from the center of one pole to the center of the next pole & Slot pitch is the distance between two adjacent slots. In dc machines, the slot pitch usually lies between 25 to 35 mm.

How to calculate Number of Damper Bars?

Number of Damper Bars provides starting torque necessary for starting the synchronous motor. It also prevents hunting of synchronous motor, that is it reduces oscillations of the rotor when the motor deviates from synchronism is calculated using Number of Damper Bar = Pole Arc/(0.8*Slot Pitch). To calculate Number of Damper Bars, you need Pole Arc (θ) & Slot Pitch (Y_s). With our tool, you need to enter the respective value for Pole Arc & Slot Pitch 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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