1. What is the 3-Phase Motor HP Formula?

The 3-phase motor horsepower formula calculates the mechanical power output of a three-phase electric motor based on electrical input parameters. It accounts for voltage, current, power factor, and motor efficiency.

2. How Does the Calculator Work?

The calculator uses the 3-phase motor HP formula:

Where:

• \( V \) — Voltage (volts)
• \( I \) — Current (amps)
• \( PF \) — Power factor (0-1)
• \( \eta \) — Motor efficiency (0-1)
• \( \sqrt{3} \) — Constant for 3-phase power
• 746 — Conversion factor from watts to HP

Explanation: The formula converts electrical power (considering power factor and efficiency) to mechanical horsepower.

3. Importance of HP Calculation

Details: Accurate HP calculation helps in motor selection, sizing electrical systems, and ensuring proper load matching to prevent motor overload or underutilization.

4. Using the Calculator

Tips: Enter voltage in volts, current in amps, power factor (typically 0.8-0.95), and efficiency (typically 0.85-0.95 for most motors). All values must be positive.

5. Frequently Asked Questions (FAQ)

Q1: Why is power factor included?
A: Power factor accounts for the phase difference between voltage and current in AC circuits, representing the ratio of real power to apparent power.

Q2: What's a typical motor efficiency value?
A: Standard motors typically have 85-95% efficiency, with higher efficiency motors reaching 95% or more.

Q3: How does voltage affect HP?
A: Higher voltage at the same current produces more power, but motors are designed for specific voltage ranges.

Q4: Can I use this for single-phase motors?
A: No, single-phase motors use a different formula without the √3 factor.

Q5: Why 746 in the denominator?
A: 1 horsepower equals 746 watts, so this converts electrical watts to mechanical horsepower.