Three Phase Squirrel Cage Induction Motor Design

What does this Python package do?

This interactive package has a collection of modules, that performs individual design steps for a Squirrel Cage Induction Motor. The user has to input the full-load (nameplate) ratings and this package will generate the design sheet, considering the design constraints at hand.

Prerequisites

1. Python 3 (3.6+ preferred). Download here.
2. Should be able to view/read Excel(.xlsx) files.

Installation

Open terminal or command prompt, and run pip install threephasescim or pip3 install threephasescim depending on your OS. This will download and install the latest release, along with the required libraries.

Before you run it

Should have the following full-load ratings. Take care of the units.

• Power Rating (kW). Eg.: 5
• Power Factor (lagging). Eg.: 0.85
• Efficiency (per unit). Eg.: 0.9
• Speed (rpm). Eg.: 1500
• Line Voltage (V). Eg.: 110

Expected Output

• 1. Average field flux (Wb/m²)
  2. Ampere conductor (ac)
  3. Expected efficiency (%)
  4. Obtained efficiency (%)
  5. Temperature rise (°C)
  6. Current criterion satisfied? (yes/no)
• Design sheet containing all the design parameters of the machine to be designed (if a solution is present).
• Else, it will show Design sheet failed.... In this case, it is advised to dive into the basics of machine design and tune the ratings accordingly. Then, retry.

How to get your design sheet?

Running the package as a scipt

1. Open terminal or command prompt.
2. Naviagte to the directory/path where you want the design sheet to be saved.
3. Type python -m threephasescim or python3 -m threephasescim and run, depending on your OS.
4. Enter all the required ratings, as asked.
5. If the design sheet is successfully prepared, then, find it in the current working directory/path.

Running as an import

Open ipython or ipython3 or Python shell.

>>> import threephasescim.master as thd
When running the above line for first time, you will be asked to enter all the required ratings.

To show the saved ratings,
>>> thd.show_rating()

To enter a new set of ratings,
>>> thd.set_rating()

To get your design sheet,
>>> thd.design_your_machine()

If the design sheet is successfully prepared, then, find it in the current working directory/path.

What to do now?

• For more detailed analysis or insights, click here.
• If facing any design issues, open an issue.
• For any suggestions, open an issue.

Reference

A Course in Electrical Machine Design
A.K.Sawhney, A.Chakrabarti
Dhanpat Rai & Co. 2006

Acknowledgement

Sincere thanks to Prof. Susanta Ray, Electrical Engineering Department, Jadavpur University for allowing the design of induction machines programmatically.