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Brake Power Formula:
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Brake Power (BP) is the actual power available at the engine's crankshaft or output shaft. It represents the useful power that can be utilized to perform work, measured using a dynamometer that applies a braking force to the engine.
The calculator uses the brake power formula:
Where:
Explanation: The formula converts rotational mechanical power into electrical power units (watts), accounting for the angular velocity and torque applied.
Details: Brake power calculation is essential for engine performance analysis, mechanical efficiency determination, power transmission system design, and comparing different engine specifications. It helps engineers optimize engine performance and fuel efficiency.
Tips: Enter rotational speed in RPM and torque in Newton-meters (N·m). Both values must be positive numbers greater than zero for accurate calculation.
Q1: What is the difference between brake power and indicated power?
A: Brake power is the actual power available at the output shaft, while indicated power is the theoretical power developed inside the engine cylinders. Brake power is always less than indicated power due to mechanical losses.
Q2: Why is the formula divided by 60?
A: The division by 60 converts rotational speed from revolutions per minute (RPM) to revolutions per second, since power in watts is measured per second.
Q3: What are typical brake power values for different engines?
A: Brake power varies significantly by engine type and size. Small car engines typically produce 50-150 kW, while large industrial engines can produce several megawatts of brake power.
Q4: How is torque measured for this calculation?
A: Torque is typically measured using a dynamometer, which applies a controlled braking force to the engine output shaft and measures the resulting torque.
Q5: Can this formula be used for electric motors?
A: Yes, the same formula applies to electric motors, where brake power represents the mechanical power output at the motor shaft.