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Voltage, however, cannot be higher than the available supply voltage. This can be illustrated using a 460 volt, 60 Hz motor. Voltage will remain at 460 volts for any speed above 60 Hz. A motor operated above its rated frequency is operating in a region known as a constant horsepower. Constant volts per hertz and torque is maintained to 60 Hz. Above 60 Hz the volts per hertz ratio decreases. 1 Flux (F) and torque (T) decrease: Φ≈ E F T = kΦIW Decreasing V/Hz 460 230 Constant Torque Constant Horsepower 0 0 30 60 90 Horsepower remains constant as speed (N) increase and torque decreases in proportion.

1 Flux (F) and torque (T) decrease: Φ≈ E F T = kΦIW Decreasing V/Hz 460 230 Constant Torque Constant Horsepower 0 0 30 60 90 Horsepower remains constant as speed (N) increase and torque decreases in proportion. The following formula applies to speed in revolutions per minute (RPM). HP (remains constant)= T (decreases) x N (increases) 5250 37 Reduced voltage and frequency starting A NEMA B motor that is started by connecting it to the power supply at full voltage and full frequency will develop approximately 150% starting torque and 600% starting current.

Definitions Locked rotor torque is also referred to as starting torque. This torque is developed when the rotor is held at rest with rated voltage and frequency applied. This condition occurs each time a motor is started. When rated voltage and frequency are applied to the stator there is a brief amount of time before the rotor turns. Locked rotor current is also referred to as starting current. This is the current taken from the supply line at rated voltage and frequency with the rotor at rest.

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