1. What is Mechanical Power in Electric Motors?

Mechanical power output of an electric motor is the actual usable power delivered to the load. It represents the rate at which work is done by the motor and is calculated as the product of torque and angular speed.

2. How Does the Calculator Work?

The calculator uses the mechanical power equation:

Where:

• \( P \) — Mechanical power (Watts)
• \( T \) — Torque (Newton-meters)
• \( \omega \) — Angular speed (radians per second)

Explanation: The equation shows that power increases linearly with both torque and rotational speed. Doubling either parameter doubles the mechanical power output.

3. Importance of Mechanical Power Calculation

Details: Calculating mechanical power is essential for motor selection, system design, efficiency analysis, and ensuring the motor can handle the required load under all operating conditions.

4. Using the Calculator

Tips: Enter torque in Newton-meters and angular speed in radians per second. For RPM conversion, remember that 1 RPM = π/30 rad/s. All values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: How do I convert RPM to rad/s?
A: Multiply RPM by π/30 (approximately 0.10472). For example, 1000 RPM = 1000 × π/30 ≈ 104.72 rad/s.

Q2: What's the difference between mechanical and electrical power?
A: Mechanical power is the output at the shaft, while electrical power is the input to the motor. The difference represents losses (heat, friction, etc.).

Q3: What are typical torque values for electric motors?
A: Small motors might produce 0.1-1 Nm, while industrial motors can produce hundreds of Nm. Torque depends on motor size and design.

Q4: Why does power matter in motor selection?
A: The motor must provide enough power to overcome the load's torque requirements at the desired operating speed.

Q5: How does this relate to motor efficiency?
A: Efficiency = (Mechanical Power Output) / (Electrical Power Input) × 100%. This calculator helps determine the numerator in that equation.