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Question
We are using an Inverter for speed control. How can we calculate the rotational speed of an induction motor?
Answer
Generally, the speed (N) of an induction motor is expressed by the following formula:
N = (120f/P) × (1 - S) (rpm)
f: Primary frequency
P: Number of motor poles
S: Slip
Example:
Where f = 60 Hz, P = 4 poles, and S = 3%,
N = ( (120 × 60) ⁄ 4) × (1 − 0.03) = 1,746 (rpm
Other Frequency Inverters FAQ
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Is it necessary to select an Inverter with a capacity that is one class higher than the capacity of the motor being used?
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When I want to electrically disconnect I/O, is it acceptable to insert a relay in the Inverter input power supply line?
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I am moving an Inverter from a location with a 50 Hz power supply frequency to another location with a 60 Hz power supply frequency. Are there any settings that need to be changed?
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