The chapter compares several results of laboratory tests of induction motor rotors with different squirrel-cage characteristics, like skewed bars and the use of a middle ring. It is intended to make comparisons between rotors that do not use any of these characteristics and rotors that use only one or both of them. The comparisons are based on laboratory tests, namely: performance test in steady state, torque-speed curve, and noise test at rated load. The results show that either skewed bars or middle ring has a relevant impact on the overall performance of the motor. Therefore, depending on the application of the motor, the adoption of one or both the characteristics can help the motor to meet the performance requirements.
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