How do you calculate torque from voltage in an electric motor?

Calculating torque from voltage in an electric motor involves several factors, including the motor’s current, speed, and power factor. The basic formula to calculate torque (T) in an electric motor is:

$$T=\frac{P}{2\pi \times RPM}$$

Where:

• ( T ) is the torque
• ( P ) is the power (which can be calculated using voltage and current)
• ( RPM ) is the rotations per minute of the motor

For a more specific calculation, especially for DC motors, the torque can be calculated using the motor constant (Kt) and the current (I):

$$T=Kt\times I$$

In this formula:

• ( Kt ) is the motor constant (torque per ampere)
• ( I ) is the current

The motor constant ( Kt ) is specific to each motor and can usually be found in the motor’s datasheet. For AC motors, you would also need to consider the power factor and slip, which is the difference between the synchronous speed and the actual speed of the motor.

Remember, these formulas provide a simplified way to calculate torque. In practice, the actual torque output of an electric motor can be influenced by many other factors, including the motor design, efficiency, and load conditions. If you’re working on a project that requires precise torque calculations, it might be helpful to consult with an electrical engineer or use specialized software tools designed for motor analysis.