1. What is the Electric Motor HP Equation?

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

Purpose: It helps engineers and technicians evaluate motor performance and select appropriate motors for applications.

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 power output by accounting for electrical input and motor efficiency characteristics.

3. Importance of Motor HP Calculation

Details: Accurate horsepower calculation ensures proper motor sizing, energy efficiency, and system reliability.

4. Using the Calculator

Tips: Enter voltage in volts, current in amps, efficiency (typically 0.7-0.95), and power factor (typically 0.8-1.0). All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: Why divide by 746?
A: 746 watts equals 1 horsepower, so this converts electrical power to mechanical horsepower.

Q2: What's a typical motor efficiency?
A: Standard motors are 85-95% efficient, while premium motors may reach 96%.

Q3: What affects power factor?
A: Load conditions and motor design. PF is lower at partial loads and for induction motors.

Q4: Can I use this for three-phase motors?
A: For three-phase, multiply by √3 (1.732) and use line-to-line voltage.

Q5: How accurate is this calculation?
A: It provides theoretical HP. Actual HP may vary due to operating conditions and motor age.