1. What is Electric 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 the motor can deliver.

2. How Does the Calculator Work?

The calculator uses the electric motor horsepower formula:

Where:

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

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

3. Importance of Horsepower Calculation

Details: Knowing a motor's horsepower is essential for proper equipment sizing, energy efficiency assessment, and performance evaluation in industrial applications.

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 horsepower?
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 phase difference between voltage and current. A lower PF means more current is required for the same real power.

Q3: What are typical efficiency values for motors?
A: Standard efficiency motors range 85-90%, premium efficiency motors 90-95%, and high-efficiency motors can reach 96%.

Q4: Can I use this for three-phase motors?
A: Yes, but for three-phase motors you should multiply the result by √3 (approximately 1.732).

Q5: How does motor speed affect horsepower?
A: Horsepower is directly related to torque and speed (HP = Torque × RPM / 5252). At the same horsepower, higher speed means lower torque.