(7-12)
The Squirrel-Cage Induction Motor is modeled as a double cage machine to account for the deep bar effect of the rotor cage. Both the Direct and Quadrature-Axes are identical and are as shown in Figure 7-1 with UD2 = UD3 = UQ2 = UQ3 = 0 and L2D = L2Q = 0.
Saturation occurs in both the mutual and leakage inductances. The saturation of LM (both LMD and LMQ ) is based on the total magnetizing current,
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(7-12) |
while saturation of the leakage inductances L1 and L23 is based on the stator line current,
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(7-13) |
The motor convention is used for the terminal power and shaft torque. That is, positive torque and power indicates motor operation and positive reactive power indicates reactive power into the machine.
