MEEN 225 Lecture Notes - Lecture 22: Short Circuit, Induction Motor

• School: Texas A&M University
• Department: Mechanical Engineering
• Course: MEEN 225
• Professor: John Steven Haglund

Document Summary

Slip speed or slip rpm, nslip is defined as the difference between synchronous speed, ns and rotor speed, nr given by nslip = ns - nr. Slip is defined as the ratio of the speed difference between synchronous speed, ns and rotor speed, nr to the synchronous speed given by. In most cases the motor slip ranges between 0 and 1. For a rotor at standstill (rotor is locked), the slip is unity. For a rotor spinning at the synchronous speed (at no load), the slip is zero. The voltage and frequency induced in the rotor both depend upon the slip where f2 =sf. Freq of the voltage in the rotor (hz) Voltage induced in the rotor at slip s. Open-circuit voltage induced in the rotor when at rest (v) The per phase equivalent circuit of a 3 induction motor is similar to a 1 equivalent circuit of a transformer.