1. What is 3-Phase Motor Horsepower?

Horsepower (HP) is a unit of measurement for power, representing the rate at which work is done. For 3-phase motors, it's calculated based on voltage, current, power factor, and efficiency.

2. How Does the Calculator Work?

The calculator uses the 3-phase horsepower formula:

Where:

• \( Voltage \) — Line-to-line voltage (V)
• \( Current \) — Phase current (A)
• \( Power\ Factor \) — Ratio of real power to apparent power (0-1)
• \( Efficiency \) — Motor efficiency (0-1)
• 746 — Conversion factor from watts to horsepower

Explanation: The formula accounts for all three phases in the system (√3 factor) and converts electrical power to mechanical power.

3. Importance of Horsepower Calculation

Details: Accurate horsepower calculation is essential for motor selection, sizing electrical components, and ensuring proper operation of mechanical systems.

4. Using the Calculator

Tips: Enter voltage in volts, current in amps, power factor (typically 0.8-0.95), and efficiency (typically 0.85-0.95). 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 electrical power supplied, while output HP is mechanical power delivered. This calculator gives output HP after accounting for efficiency losses.

Q2: What's a typical power factor for motors?
A: Induction motors typically have power factors between 0.80-0.95, depending on size and load conditions.

Q3: How does voltage affect horsepower?
A: For a given current, higher voltage means higher horsepower. However, motors are designed for specific voltage ranges.

Q4: Why is efficiency important?
A: Efficiency represents energy losses (heat, friction). Higher efficiency means more electrical power is converted to mechanical power.

Q5: Can I use this for single-phase motors?
A: No, this formula is specifically for 3-phase systems. Single-phase motors use a different calculation.