1. What is a Motor Rated Power Calculator?

Definition: This calculator estimates the rated power output of an electric motor based on voltage, current, efficiency, and power factor.

Purpose: It helps electrical engineers and technicians determine the actual power output of motors for proper sizing and selection.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( P_w \) — Rated power (watts)
• \( V \) — Voltage (volts)
• \( I \) — Current (amps)
• \( \eta \) — Motor efficiency (0-1)
• \( PF \) — Power factor (0-1)

Explanation: The formula calculates the real power output by accounting for both the motor's efficiency and the phase difference between voltage and current.

3. Importance of Motor Power Calculation

Details: Accurate power calculation ensures proper motor selection, prevents overload conditions, and optimizes energy efficiency in electrical systems.

4. Using the Calculator

Tips: Enter the voltage in volts, current in amps, efficiency (default 0.9), and power factor (default 0.8). 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 industrial motors.

Q2: What is power factor?
A: Power factor (PF) is the ratio of real power to apparent power, representing phase difference between voltage and current in AC systems.

Q3: How do I find motor current?
A: Check motor nameplate specifications or measure with a clamp meter under load.

Q4: Does this work for both AC and DC motors?
A: For DC motors, set PF=1. For AC motors, use the actual power factor.

Q5: How does this differ from input power?
A: Input power would be V×I, while this calculates output power after accounting for losses (efficiency) and phase angle (PF).