1. What is Shaft Power?

Shaft power (P_shaft) is the mechanical power delivered by an electric motor through its rotating shaft. It represents the actual usable power available to drive mechanical loads.

2. How Does the Calculator Work?

The calculator uses the shaft power equation:

Where:

• \( P_{shaft} \) — Shaft power in watts (W)
• \( T \) — Torque in newton-meters (Nm)
• \( \omega \) — Angular speed in radians per second (rad/s)

Explanation: The equation shows that power is the product of torque and angular velocity. Higher torque or faster rotation results in greater power output.

3. Importance of Shaft Power Calculation

Details: Calculating shaft power is essential for motor selection, system design, and efficiency analysis in mechanical and electrical engineering applications.

4. Using the Calculator

Tips: Enter torque in Nm and angular speed in rad/s. Both values must be positive numbers. For RPM conversion, multiply RPM by 2π/60 to get rad/s.

5. Frequently Asked Questions (FAQ)

Q1: How do I convert RPM to rad/s?
A: Multiply RPM by 0.10472 (which is 2π/60). For example, 1000 RPM × 0.10472 = 104.72 rad/s.

Q2: What's the difference between shaft power and electrical input power?
A: Shaft power is mechanical output, while electrical input power is what the motor draws from the supply. The difference accounts for motor efficiency losses.

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

Q4: Can I use this for hydraulic pumps or other rotating machinery?
A: Yes, the same formula applies to any rotating shaft power calculation, whether it's a motor, pump, turbine, or other rotating equipment.

Q5: How does power relate to energy consumption?
A: Energy is power multiplied by time. For example, 1 kW running for 1 hour consumes 1 kWh of energy.