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Synthesis of Double-Cage Induction Motor Design

1959; Institute of Electrical and Electronics Engineers; Volume: 78; Issue: 3 Linguagem: Inglês

10.1109/aieepas.1959.4500409

2379-6766

Howard E. Jordan,

Real-time simulation and control systems

The basic equations for synthesizing a double-cage rotor slot have been derived and the procedure suitable for programming on a digital computer has been discussed. To summarize, the steps in the procedure are as follows: 1. Select a satisfactory single-cage design of the same horsepower rating and speed as the double-cage rating to be designed. 2. Establish the desired objectives for locked-rotor torque and breakdown torque. 3. Select a winding which will give 15% higher flux than the starting point singlecage motor and make a complete performance calculation on this design. 4. From the results of the single-cage calculation values for r 1 , x 1 , r m , x m , x 34 , and r er can be closely estimated. 5. Calculate the value of r 4 required to give the desired full-load slip. 6. Calculate x 4 ' using equations 1 and 6 and the breakdown torque objective. 7. Calculate r 3 using equation 11 and the locked-rotor torque objective. 8. Design the double-cage slot to provide the desired values of r 3 , r 4 , and x 4 '. 9. Make a complete performance calculation on the resulting double-cage design. If the results are not sufficiently close to the desired objectives and if positive, real numbers were obtained in the solutions for x 4 ' and r 3 in steps 6 and 7, then a more accurate estimate of the 6 parameters r 1 , x 1 , r m , x m , x 34 , and r er is required. Use the newly calculated values of these in place of the ones estimated from the single-cage calculation and repeat steps 5 through 8.