1. What is an AC Motor Horsepower Calculator?

Definition: This calculator determines the mechanical power output (horsepower) of an AC motor based on electrical input parameters.

Purpose: It helps engineers, technicians, and electricians assess motor performance and select appropriate motors for applications.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( HP \) — Horsepower output
• \( V \) — Voltage (volts)
• \( I \) — Current (amps)
• \( \eta \) — Motor efficiency (0-1)
• \( PF \) — Power factor (0-1)
• 746 — Conversion factor (watts to HP)

Explanation: The formula calculates the actual mechanical power output by accounting for electrical input and motor efficiency characteristics.

3. Importance of Horsepower Calculation

Details: Accurate horsepower calculation ensures proper motor sizing, prevents overload conditions, and optimizes energy efficiency in industrial and commercial applications.

4. Using the Calculator

Tips: Enter the motor's voltage, current draw, efficiency (default 0.9), and power factor (default 0.85). Efficiency and power factor must be between 0 and 1.

5. Frequently Asked Questions (FAQ)

Q1: What's a typical motor efficiency value?
A: Standard motors range from 0.85-0.95, with premium efficiency motors reaching 0.95+.

Q2: Why is power factor important?
A: Power factor represents the phase difference between voltage and current, affecting the real power available for work.

Q3: How do I find motor current?
A: Measure with a clamp meter or check motor nameplate ratings under load.

Q4: What's the 746 conversion factor?
A: 1 horsepower equals 746 watts, the standard conversion between electrical and mechanical power.

Q5: Does this work for three-phase motors?
A: For three-phase, multiply the result by √3 (1.732) to account for phase relationships.