When a motor starts to rotate the slip is 100 % and the motor current is at maximum. Number of poles, frequencies and synchronous induction motor speed No. When the rotor is not turning the slip is 100 %.įull-load slip varies from less than 1 % in high hp motors to more than 5-6 % in minor hp motors. N a = shaft rotating speed (rev/min, rpm) N s = synchronous speed of magnetic field (rev/min, rpm) It is common to express the slip as the ratio between the shaft rotation speed and the synchronous magnetic field speed. Slip increases with increasing load - providing a greater torque. The difference between the synchronous speed of the electric motor magnetic field, and the shaft rotating speed is slip - measured in RPM or frequency. In normal operation with a load the rotor speed always lags the magnetic field's speed allowing the rotor bars to cut magnetic lines of force and produce a useful torque. An AC (Alternating Current) induction motor consists of a stator and a rotor and the interaction of the currents flowing in the rotor bars and the rotating magnetic field in the stator generates the torque that turns the motor.
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