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RPM Formula:
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The Electric Motor RPM formula calculates the synchronous speed of AC motors based on frequency and number of poles. This formula provides the theoretical maximum speed at which an AC motor can operate under ideal conditions.
The calculator uses the RPM formula:
Where:
Explanation: The formula calculates the synchronous speed of AC motors, which is the speed at which the magnetic field rotates. Actual operating speed is slightly less due to slip.
Details: Accurate RPM calculation is crucial for motor selection, system design, performance analysis, and ensuring motors operate within their designed specifications for optimal efficiency and longevity.
Tips: Enter frequency in Hz and number of poles (must be even number ≥ 2). Common frequencies are 50 Hz or 60 Hz depending on regional power standards.
Q1: What is synchronous speed?
A: Synchronous speed is the theoretical maximum speed at which an AC motor can rotate, determined by the frequency of the power supply and the number of magnetic poles.
Q2: Why must the number of poles be even?
A: Poles in AC motors always come in pairs (north and south) to create the rotating magnetic field, so the number must be even.
Q3: What is the difference between synchronous and actual speed?
A: Actual operating speed is slightly less than synchronous speed due to slip, which is necessary for torque production in induction motors.
Q4: What are common pole configurations?
A: Common configurations include 2-pole (high speed), 4-pole (medium speed), and 6-pole (lower speed) motors for different applications.
Q5: How does frequency affect motor speed?
A: Higher frequency results in higher synchronous speed. This is why variable frequency drives can control motor speed by varying frequency.