1. What is an Electric Motor Horsepower Calculator?

Definition: This calculator estimates the horsepower output of an electric motor based on voltage, current, efficiency, and power factor.

Purpose: It helps engineers, technicians, and electricians determine the mechanical power output of electric motors.

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)

Explanation: The electrical power (V × I) is adjusted by efficiency and power factor to get actual power, then converted to horsepower (1 HP = 746 watts).

3. Importance of Motor Horsepower Calculation

Details: Proper horsepower calculation ensures correct motor sizing, energy efficiency, and system compatibility.

4. Using the Calculator

Tips: Enter the voltage in volts, current in amps, 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 is motor efficiency?
A: Efficiency (η) is the ratio of mechanical power output to electrical power input, typically 0.8-0.95 for good motors.

Q2: What is power factor?
A: Power factor (PF) is the ratio of real power to apparent power, typically 0.8-0.95 for AC motors.

Q3: Why divide by 746?
A: 746 watts equals 1 horsepower, so we convert watts to HP.

Q4: Can I use this for three-phase motors?
A: This formula works for single-phase. For three-phase, you'd need to multiply by √3 (1.732).

Q5: Where can I find motor efficiency?
A: Check the motor nameplate or manufacturer specifications. Typical values are 0.85-0.95.