1. What is a HP to kW Calculator for 3 Phase Motors?

Definition: This calculator converts horsepower (HP) to kilowatts (kW) specifically for 3-phase electric motors.

Purpose: It helps electrical engineers, technicians, and maintenance personnel quickly convert between these common power units.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( P_{kW} \) — Power in kilowatts
• \( HP \) — Power in horsepower

Explanation: The conversion factor 0.746 kW/HP is derived from the exact conversion between mechanical and electrical power units.

3. Importance of Power Conversion

Details: Accurate conversion between HP and kW is essential for motor sizing, electrical system design, and energy efficiency calculations.

4. Using the Calculator

Tips: Simply enter the horsepower value (must be > 0) and the calculator will provide the equivalent power in kilowatts.

5. Frequently Asked Questions (FAQ)

Q1: Why is the conversion factor 0.746?
A: 1 horsepower equals exactly 745.7 watts (0.7457 kW), commonly rounded to 0.746 for practical calculations.

Q2: Does this work for single-phase motors?
A: Yes, the HP to kW conversion is the same regardless of phase, but motor efficiency differs between single and three-phase systems.

Q3: How accurate is this conversion?
A: The conversion is mathematically exact, but actual motor power may vary slightly due to efficiency factors.

Q4: Should I consider motor efficiency?
A: This gives theoretical conversion. For actual electrical input power, divide by motor efficiency (typically 0.8-0.95).

Q5: What about other power units?
A: 1 HP = 0.746 kW = 746 W = 550 ft-lb/s = 2545 BTU/hr.