1. What is the Hz to RPM Formula?

The Hz to RPM formula calculates the rotational speed of an AC motor from the electrical frequency and number of poles. This is essential for motor control, industrial applications, and electrical engineering.

2. How Does the Calculator Work?

The calculator uses the RPM formula:

Where:

• \( RPM \) — Rotational speed in revolutions per minute
• \( Hz \) — Electrical frequency in hertz
• \( Poles \) — Number of magnetic poles in the motor

Explanation: The formula converts electrical frequency to mechanical speed, accounting for the motor's pole configuration which determines its synchronous speed.

3. Importance of RPM Calculation

Details: Accurate RPM calculation is crucial for motor selection, speed control systems, industrial automation, and ensuring proper operation of motor-driven equipment.

4. Using the Calculator

Tips: Enter frequency in Hz and number of poles (must be even number ≥2). All values must be valid (frequency > 0, poles ≥ 2).

5. Frequently Asked Questions (FAQ)

Q1: Why divide poles by 2 in the formula?
A: Because each pole pair (north-south) creates one complete magnetic cycle, and the formula calculates speed based on pole pairs rather than individual poles.

Q2: What is synchronous speed?
A: Synchronous speed is the theoretical speed at which the motor's magnetic field rotates. Actual operating speed is slightly less due to slip.

Q3: What are typical pole configurations?
A: Common configurations are 2-pole (3600 RPM at 60Hz), 4-pole (1800 RPM at 60Hz), 6-pole (1200 RPM at 60Hz), etc.

Q4: Does this work for variable frequency drives?
A: Yes, the formula applies to VFD applications where frequency is varied to control motor speed.

Q5: What about motor slip?
A: This calculation gives synchronous speed. Actual speed will be 2-5% lower due to slip, depending on motor design and load.