1. DC Motor Power and Torque Basics

DC motor performance is characterized by three key parameters: voltage (V), current (I), and speed (N). From these, we can calculate power (P) and torque (T), which are crucial for selecting the right motor for an application.

2. How the Calculator Works

The calculator uses two fundamental equations:

Where:

• \( P \) — Power in watts (W)
• \( V \) — Voltage in volts (V)
• \( I \) — Current in amperes (A)
• \( T \) — Torque in newton-meters (Nm)
• \( N \) — Speed in revolutions per minute (RPM)

Explanation: The first equation calculates electrical power input. The second converts this to mechanical torque at a given speed.

3. Practical Applications

Details: These calculations are essential for:

• Selecting appropriate motors for robotics
• Designing power transmission systems
• Determining battery requirements
• Evaluating motor efficiency

4. Using the Calculator

Tips:

• Enter voltage and current for power calculation
• Add speed to also calculate torque
• All values must be positive numbers
• For no-load speed, torque will be zero

5. Frequently Asked Questions (FAQ)

Q1: What's the relationship between torque and speed?
A: In DC motors, torque and speed have an inverse relationship - as torque increases, speed decreases, and vice versa.

Q2: How does voltage affect motor performance?
A: Higher voltage typically increases speed, while higher current increases torque. Both affect power consumption.

Q3: Why does torque calculation need speed?
A: Torque is the rotational force at a specific speed. Power is the rate of doing work, which depends on both force and speed.

Q4: What's typical efficiency for DC motors?
A: Efficiency varies (50-90%) depending on motor type and size. These calculations assume 100% efficiency for simplicity.

Q5: How do I measure these parameters?
A: Use a multimeter for voltage/current, a tachometer for speed, and a torque sensor or calculated load for torque.