How to calculate stator to rotor winding turns ratio?

Click For Summary
SUMMARY

The discussion focuses on calculating the stator to rotor winding turns ratio in electrical machines. A key insight is that the rotor current used for calculations must be referred to the stator side, necessitating the adjustment for the stator-to-turns ratio. The equation provided, P_{in} - i_s^2R_s - i_r^2R_r = P_{dev}, is essential for determining the correct turns ratio. The user attempted a calculation yielding X=211.8, but doubts its accuracy, suggesting a potential turns ratio of 1:1 based on equal measured currents.

PREREQUISITES
  • Understanding of electrical machine theory
  • Familiarity with current measurement techniques
  • Knowledge of power equations in electrical systems
  • Ability to interpret and manipulate algebraic equations
NEXT STEPS
  • Study the principles of stator and rotor current relationships in electrical machines
  • Learn about the implications of turns ratios on machine performance
  • Explore methods for accurately measuring stator and rotor currents
  • Investigate common errors in calculating electrical machine parameters
USEFUL FOR

Electrical engineering students, professionals working with electrical machines, and anyone involved in the design or analysis of motor systems will benefit from this discussion.

theone
Messages
81
Reaction score
0

Homework Statement


I have a set of data that I need to use to calculate the stator to winding turns ratio. A hint was given:

"The rotor current measured is the rotor winding current. However, the rotor current we use for our calculations is the current referred to the stator side of the machine. Therefore, to get the right value, you have to account for the stator-to-turns ratio."

Homework Equations


## P_{in} - i_s^2R_s - i_r^2R_r = P_{dev}##

The Attempt at a Solution


I tried
## 226 - (1.005)^212 - (X0.9)^218 = 213.819##
and got X=211.8 but I don't think its correct?
 

Attachments

  • Untitled10.png
    Untitled10.png
    17.4 KB · Views: 970
Because you measured the stator and rotor currents to be about equal, then it sounds like the turns ratio is 1:1

BTW, it would have been much better if you had typed the table values in your post, instead of attaching an almost indecipherible photo. That's something to remember for next time.
 

Similar threads

Engineering How to calculate rotor flux of the three phase squirrel cage induction motor?
  • · Replies 4 ·
Replies
4
Views
3K
Undergrad Would an BLDC motor with rotor winded like a mirrored stator rotate?
  • · Replies 1 ·
Replies
1
Views
1K
Engineering Induction motor calculation problems
  • · Replies 6 ·
Replies
6
Views
2K
Revamp Your Motorcycle's Charging System for 12v DC: Stator Winding Help
  • · Replies 3 ·
Replies
3
Views
4K
How to calculate the inductance of a stator winding
  • · Replies 5 ·
Replies
5
Views
9K
Engineering Using the Locked Rotor Test to find parameters of DC motor?
  • · Replies 6 ·
Replies
6
Views
7K
Finding Turns Ratio and Average Current in the Primary Winding
  • · Replies 12 ·
Replies
12
Views
5K
Engineering How Do You Calculate Torque and Efficiency in a Three Phase Induction Motor?
  • · Replies 6 ·
Replies
6
Views
3K
3-phase delta supply to a 3-phase synchronous motor?
  • · Replies 1 ·
Replies
1
Views
1K
How to calculate open rotor voltage?
  • · Replies 2 ·
Replies
2
Views
1K