1. What is Motor Horsepower?

Horsepower (HP) is a unit of measurement for power, representing the rate at which work is done. For electric motors, it indicates the mechanical output power based on electrical input and efficiency.

2. How Does the Calculator Work?

The calculator uses the motor horsepower formula:

Where:

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

Explanation: The formula calculates the mechanical power output by accounting for electrical input (V × I), power factor (PF), and motor efficiency (η).

3. Importance of HP Calculation

Details: Knowing a motor's horsepower is essential for proper sizing, performance evaluation, energy efficiency assessment, and system design.

4. Using the Calculator

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

5. Frequently Asked Questions (FAQ)

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

Q2: Why is power factor important?
A: Power factor represents the ratio of real power to apparent power. Motors with low PF draw more current for the same real power, reducing system efficiency.

Q3: What are typical efficiency values?
A: Standard motors are 85-95% efficient, with higher efficiency in larger motors. Premium efficiency motors can reach 95% or more.

Q4: Can I use this for three-phase motors?
A: For three-phase motors, multiply the result by √3 (1.732) to account for the three-phase power calculation.

Q5: How does HP relate to torque?
A: HP = (Torque × RPM)/5252. Horsepower describes how fast work can be done, while torque is the rotational force.