1. What is Electric Motor Horsepower?

Definition: Horsepower (HP) is a unit of measurement for the power output of electric motors, indicating their mechanical work capability.

Purpose: This calculator helps determine the horsepower of an electric motor based on its electrical characteristics and efficiency.

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 factors.

3. Importance of Horsepower Calculation

Details: Proper HP calculation ensures motors are correctly sized for applications, preventing underpowered performance or energy waste from oversized motors.

4. Using the Calculator

Tips: Enter voltage, current, efficiency (default 0.9), and power factor (default 0.85). Efficiency and power factor range from 0-1.

5. Frequently Asked Questions (FAQ)

Q1: What's the difference between input and output HP?
A: Input HP is electrical power consumed, output HP is mechanical power delivered. This calculator determines output HP.

Q2: What's a typical motor efficiency value?
A: Standard motors range 0.85-0.95, premium efficiency motors can reach 0.96.

Q3: How does power factor affect HP?
A: Lower PF means more current is needed for the same power output, reducing system efficiency.

Q4: Why divide by 746?
A: 746 watts = 1 horsepower, converting electrical power to mechanical horsepower.

Q5: Can I use this for three-phase motors?
A: For three-phase, multiply voltage by √3 (1.732) first to get line-to-line voltage.