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DC Motor Equations:
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DC motor properties like power and torque are fundamental parameters that describe the motor's performance characteristics. Power represents the rate of energy conversion, while torque measures the rotational force produced by the motor.
The calculator uses these fundamental equations:
Where:
Explanation: The power equation shows the electrical input power, while the torque equation converts this to mechanical output torque considering the rotational speed.
Details: Calculating motor properties is essential for selecting the right motor for an application, determining efficiency, and ensuring proper mechanical design. Power indicates energy consumption, while torque determines the motor's ability to perform work.
Tips: Enter voltage in volts, current in amps, and speed in RPM. All values must be positive numbers. The calculator will compute both electrical power and mechanical torque.
Q1: What's the difference between power and torque?
A: Power is the rate of doing work, while torque is the rotational force. Power depends on both torque and speed (P = T × ω).
Q2: Why does torque decrease as speed increases?
A: For a given power, torque must decrease as speed increases because power is the product of torque and angular velocity.
Q3: Are these calculations accurate for all DC motors?
A: These are ideal equations that neglect losses like friction and electrical resistance. Real-world values may be 10-20% lower.
Q4: What if I only know power and speed?
A: You can rearrange the equations to calculate torque directly from power and speed, or current if you know voltage.
Q5: How does motor efficiency affect these calculations?
A: Efficiency would reduce the output power and torque. Multiply the calculated values by the efficiency (as a decimal) for more accurate results.