The difference between the synchronous speed of an three phase induction motor and its operating speed is called slip, which would be given in RPM. What is another way that slip can be expressed?
β’ Slip is defined based on the difference between synchronous speed and actual rotor speed β’ Think about how engineers often compare an actual value to an ideal value (for example, efficiency) β’ How can a difference in speed be normalized so itβs easier to compare between motors of different sizes and RPMs?
β’ If slip is already given in RPM, what simple math operation could you do with synchronous speed to make that into a relative measure instead of an absolute one? β’ Which choice describes a relationship that compares motor speed to its ideal (synchronous) condition, rather than current draw, torque, or horsepower? β’ Ask yourself: which option would stay meaningful if you changed to a motor with a completely different synchronous RPM?
β’ Verify which option directly relates slip to synchronous speed, not to current, torque, or horsepower β’ Check which choice could be written as a ratio or fraction involving the speed difference and the synchronous speed β’ Eliminate any options that talk about load conditions (no load vs full load) for quantities other than speed
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