# Torque Formula in Electrical Motors

We previously studied four induction motor formulas relating:

1. Synchronous speed, frequency, and poles
2. Motor slip
3. Torque, Power, and Speed
4. Starting Current calculator

In this article an expansion of Torque Formula in Electrical Motors is presented below.

The torque (T) of a motors is directly proportional to its power (P) and inversely proportional to its rotational speed or RPM (N). The mathematical formula relating torque, power, and rotational speed is:

T = (P * 60) / (2 * π * RPM)

where in above equation

• T is the torque in Newton-meters (Nm)
• P is the power in watts (W)
• RPM is the rotational speed in revolutions per minute
• π is a mathematical constant approximately equal to 3.14159

Concluding Remarks:

The formula provided above is generally applicable to different types of electrical motors, including both AC and DC motors. However, it’s important to note that the specific parameters and constants used in the formulas may differ based on the motor type and its characteristics. The formulas provided offer a general representation of the relationship between torque, rotational speed, and power for rotating objects, but the actual implementation and calculation may vary depending on the motor design and specifications. The motor sizing calculations provided by Johann Tang here dives deep in to all fundamental and important concepts you need to understand basics of torque.