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5. A 2-pole motor is operating on a 60 Hz power supply. The rotor is turning at 3450 RPM. Slip is _________ %. 41 Motor Specifications Nameplate The nameplate of a motor provides important information necessary for selection and application. The following drawing illustrates the nameplate of a sample 30 horsepower AC motor. Specifications are given for the load and operating conditions as well as motor protection and efficiency. Voltage and amps AC motors are designed to operate at standard voltages and frequencies.

This reduced voltage may prevent the motor from getting its load started or keeping it running at rated speed. A 10% increase in supply voltage, on the other hand, increases the starting torque by 20%. This increased torque may cause damage during startup. A conveyor, for example, may lurch forward at startup. A voltage variation will cause similar changes in the motor’s starting amps, full-load amps, and temperature rise. Below 0 Above +20 +15 +10 +5 0 -5 -10 -15 -20 -15 -10 -5 0 +5 % Voltage Variation 54 +10 +15 Frequency A variation in the frequency at which the motor operates causes changes primarily in speed and torque characteristics.

The speed of the rotating magnetic field is referred to as ____________ speed. 3. The synchronous speed of a 60 Hz 4-pole motor is ____________ RPM. 4. The difference in speed between the rotor and synchronous speed is ____________ . 5. A 2-pole motor is operating on a 60 Hz power supply. The rotor is turning at 3450 RPM. Slip is _________ %. 41 Motor Specifications Nameplate The nameplate of a motor provides important information necessary for selection and application. The following drawing illustrates the nameplate of a sample 30 horsepower AC motor.

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