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Motor Output Power Formula:
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Motor output power represents the mechanical power delivered by the motor shaft. It is a crucial parameter in motor design and performance evaluation, indicating the motor's ability to perform useful work.
MotorCAD uses the fundamental power calculation formula:
Where:
Explanation: The formula calculates the mechanical power output by multiplying torque and angular speed, then accounting for the motor's efficiency to determine the actual power delivered to the load.
Details: Accurate output power calculation is essential for motor sizing, performance optimization, thermal management, and ensuring the motor meets application requirements without overheating or premature failure.
Tips: Enter torque in Nm, angular speed in rad/s, and efficiency as a decimal between 0 and 1. All values must be positive, with efficiency typically ranging from 0.7 to 0.95 for most electric motors.
Q1: What is the difference between input and output power?
A: Input power is electrical power consumed, while output power is mechanical power delivered. Output power = Input power × Efficiency.
Q2: How do I convert RPM to rad/s?
A: Multiply RPM by 2π/60. For example, 1000 RPM = 1000 × (2×3.1416)/60 ≈ 104.72 rad/s.
Q3: What are typical efficiency values for electric motors?
A: Small motors: 70-85%, Medium motors: 85-92%, Large motors: 92-97%. Efficiency depends on motor type, size, and operating conditions.
Q4: Why is torque measurement important?
A: Torque determines the motor's ability to overcome load resistance. Higher torque allows the motor to handle heavier loads at the same speed.
Q5: Can this calculator be used for all motor types?
A: Yes, the fundamental power equation applies to all rotating electrical machines including AC, DC, induction, and synchronous motors.