1. What is Motor Power?

Motor power is the rate at which electrical energy is converted to mechanical energy. It's typically measured in watts (W) or horsepower (HP). The power consumed by a motor depends on voltage, current, and power factor.

2. How Does the Calculator Work?

The calculator uses the single-phase motor power formula:

Where:

• \( P \) — Power in watts (W)
• \( V \) — Voltage in volts (V)
• \( I \) — Current in amperes (A)
• \( PF \) — Power factor (unitless, 0-1)

Explanation: The formula calculates the real power consumed by a single-phase AC motor, accounting for the phase difference between voltage and current.

3. Importance of Power Factor

Details: Power factor (PF) represents the ratio of real power to apparent power. A higher PF (closer to 1) indicates more efficient power usage. Typical motor PF values range from 0.8 to 0.95.

4. Using the Calculator

Tips:

• Measure voltage and current while motor is operating under normal load
• Use manufacturer's power factor if available, or estimate (0.85 is typical)
• For three-phase motors, use the three-phase power formula instead

5. Frequently Asked Questions (FAQ)

Q1: What's the difference between single-phase and three-phase power calculation?
A: Three-phase power calculation includes a √3 factor: \( P = \sqrt{3} \times V \times I \times PF \).

Q2: How do I convert watts to horsepower?
A: 1 HP ≈ 746 watts. Divide wattage by 746 to get horsepower.

Q3: Why is my motor's actual power consumption higher than nameplate rating?
A: Nameplate shows output power. Input power is higher due to inefficiencies (heat, friction, etc.).

Q4: What affects power factor in motors?
A: PF decreases with under-loading, poor maintenance, or improper motor sizing.

Q5: How can I improve motor power factor?
A: Use power factor correction capacitors, avoid motor oversizing, and ensure proper maintenance.