I was recently doing a first-course lab on Induction Motors. We were asked to plot the torque-slip characteristics of a 4-pole 3 phase induction motor (3.7kW).
I just analyzed the data I plotted from the wattmeter readings (connected as shown below) and the rpm measured using a tachometer.
Here's the T-slip data I plotted on my spreadsheet.
Data points were obtained by gradually loading a mechanically coupled DC generator.
I don't think my plot looks anything like the t-slip diagrams from my lectures and even Google Images.
Can someone who knows what's going on explain it to me?