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DC Motor Power Formula:
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DC motor power refers to the electrical power consumed by a DC motor during operation. It represents the rate at which electrical energy is converted into mechanical energy and is measured in watts (W).
The calculator uses the fundamental DC power formula:
Where:
Explanation: This formula calculates the electrical power input to the DC motor. The actual mechanical output power will be less due to efficiency losses.
Details: Calculating DC motor power is essential for proper motor selection, circuit design, power supply sizing, and efficiency analysis in various applications from robotics to industrial machinery.
Tips: Enter voltage in volts (V) and current in amperes (A). Both values must be positive numbers greater than zero for accurate calculation.
Q1: What is the difference between input power and output power?
A: Input power is the electrical power consumed (P = V × I), while output power is the mechanical power delivered. Output power is always less due to efficiency losses.
Q2: How does motor efficiency affect power calculation?
A: Efficiency (η) relates input and output power: Output Power = Input Power × η. Typical DC motor efficiencies range from 70% to 90%.
Q3: What are typical voltage and current ranges for DC motors?
A: DC motors commonly operate at 6V, 12V, 24V, or 48V with currents ranging from milliamps for small motors to hundreds of amps for large industrial motors.
Q4: Why is power calculation important for motor selection?
A: Proper power calculation ensures the motor can handle the required load without overheating and helps select appropriate power supplies and controllers.
Q5: Can this formula be used for AC motors?
A: No, AC motor power calculation requires considering power factor: P = V × I × PF for single-phase, and P = √3 × V × I × PF for three-phase systems.