1. What Is Motor Input Power?

Motor input power refers to the electrical power consumed by an electric motor from the power source. It represents the total power required to operate the motor, including losses due to inefficiency.

2. How Does The Calculator Work?

The calculator uses the input power formula:

Where:

• \( P_{in} \) — Input power (Watts)
• \( P_{out} \) — Output power (Watts)
• \( \eta \) — Efficiency (0-1)

Explanation: The formula calculates the electrical power input required to achieve a specific mechanical power output, accounting for motor efficiency losses.

3. Importance Of Input Power Calculation

Details: Accurate input power calculation is essential for proper electrical system design, circuit breaker sizing, wire selection, and energy consumption analysis in motor applications.

4. Using The Calculator

Tips: Enter output power in watts and efficiency as a decimal between 0 and 1. For example, 85% efficiency should be entered as 0.85. All values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: What is the difference between input and output power?
A: Input power is the electrical power consumed by the motor, while output power is the mechanical power delivered by the motor shaft.

Q2: What are typical motor efficiency values?
A: Standard AC motors typically range from 80-95% efficiency, while high-efficiency motors can reach 96-98%. DC motors generally range from 75-90%.

Q3: Why is efficiency less than 100%?
A: Motors experience energy losses due to heat, friction, magnetic losses, and electrical resistance, preventing 100% efficiency.

Q4: How does motor size affect efficiency?
A: Larger motors generally have higher efficiency than smaller ones due to better heat dissipation and optimized design.

Q5: When should I use this calculation?
A: Use this for electrical system design, energy consumption analysis, cost calculations, and proper component selection for motor-driven systems.