1. What is the Hz to RPM Conversion?

The Hz to RPM conversion calculates the rotational speed of an AC motor or generator based on its electrical frequency and number of magnetic poles. This is essential for understanding motor performance and synchronization.

2. How Does the Calculator Work?

The calculator uses the RPM formula:

Where:

• \( Hz \) — Electrical frequency in hertz
• \( Poles \) — Number of magnetic poles in the motor
• \( 60 \) — Conversion factor from seconds to minutes

Explanation: The formula converts electrical frequency to mechanical rotational speed by accounting for the number of magnetic pole pairs and converting from cycles per second to revolutions per minute.

3. Importance of RPM Calculation

Details: Accurate RPM calculation is crucial for motor selection, speed control applications, mechanical design, and ensuring proper operation of rotating equipment in industrial and commercial settings.

4. Using the Calculator

Tips: Enter frequency in Hz (typically 50 or 60 Hz for mains power) and the number of poles (common values: 2, 4, 6, 8). All values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: What is the relationship between Hz and RPM?
A: RPM = (Hz × 60) / (Poles/2) or simplified as RPM = (Hz × 120) / Poles, where Poles is always an even number.

Q2: What are typical RPM values for common motors?
A: For 60 Hz systems: 2-pole = 3600 RPM, 4-pole = 1800 RPM, 6-pole = 1200 RPM. For 50 Hz systems: 2-pole = 3000 RPM, 4-pole = 1500 RPM.

Q3: Why is the number of poles important?
A: The number of poles determines the synchronous speed of the motor. More poles result in lower RPM for the same frequency.

Q4: Does this calculate synchronous or actual RPM?
A: This calculates synchronous speed. Actual motor RPM is slightly less due to slip in induction motors.

Q5: Can this be used for DC motors?
A: No, this formula is specifically for AC synchronous motors. DC motor speed depends on voltage and load characteristics.