1. What is Horsepower of Electric Motor Calculator?

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

Purpose: It helps engineers, technicians, and electricians determine motor performance and verify specifications.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

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

Explanation: The electrical power (V×I) is adjusted for motor efficiency and power factor, then converted to mechanical horsepower.

3. Importance of Horsepower Calculation

Details: Accurate horsepower calculation ensures proper motor sizing, prevents overload conditions, and helps evaluate motor performance.

4. Using the Calculator

Tips: Enter 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, usually 0.8-0.95 for AC motors at full load.

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

Q4: Is this for AC or DC motors?
A: This works for both, but DC motors typically have PF=1. For 3-phase AC, multiply by √3 (1.732).

Q5: How accurate is this calculation?
A: It provides theoretical output. Actual horsepower may vary due to load conditions and motor design.