1. What is Shaft Power?

Shaft power is the mechanical power delivered by an electric motor through its rotating shaft. It represents the actual usable power output of the motor after accounting for all losses.

2. How Does the Calculator Work?

The calculator uses the shaft power formula:

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 formula 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. It helps determine if a motor is properly sized for its application.

4. Using the Calculator

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

5. Frequently Asked Questions (FAQ)

Q1: How is shaft power different from electrical input power?
A: Shaft power is mechanical output power, while electrical input power is what the motor draws from the supply. The difference represents motor losses.

Q2: What are typical shaft power values for industrial motors?
A: Industrial motors range from fractional horsepower (100s of watts) to several megawatts, depending on application.

Q3: How do I measure torque and speed?
A: Torque can be measured with a torque sensor or dynamometer. Speed is typically measured with a tachometer or encoder.

Q4: Can I use this for hydraulic or pneumatic motors?
A: Yes, the formula applies to any rotating mechanical system, not just electric motors.

Q5: What if I know power and need to find torque?
A: Rearrange the formula: \( T = P_{shaft} / \omega \). You can calculate torque if you know power and speed.