Number of Damper Bars Solution

STEP 0: Pre-Calculation Summary
Formula Used
Number of Damper Bar = Pole Arc/(0.8*Slot Pitch)
nd = θ/(0.8*Ys)
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
nd = θ/(0.8*Ys) --> 257.6/(0.8*32.2)
Evaluating ... ...
nd = 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)

Credits

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Created by swapanshil kumar
ramgarh engineering college (REC), ramgarh
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Chandigarh University (CU), Punjab
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Mechanical Parameters Calculators

Armature Diameter using Output Equation
​ LaTeX ​ Go Armature Diameter = sqrt(Output Power/(Output Coefficient AC*1000*Synchronous Speed*Armature Core Length))
Armature Core Length using Output Equation
​ LaTeX ​ Go Armature Core Length = Output Power/(Output Coefficient AC*1000*Armature Diameter^2*Synchronous Speed)
Diameter of Damper Bar
​ LaTeX ​ Go Diameter of Damper Bar = sqrt((4*Area of Damper Winding)/pi)
Number of Damper Bars
​ LaTeX ​ Go Number of Damper Bar = Pole Arc/(0.8*Slot Pitch)

Number of Damper Bars Formula

​LaTeX ​Go
Number of Damper Bar = Pole Arc/(0.8*Slot Pitch)
nd = θ/(0.8*Ys)

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 nd 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 (Ys) 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 nd = θ/(0.8*Ys) 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 (Ys). 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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