The product of the torque, speed, and the appropriate conversion factor from the table is:Ĭalculation of power requirements is often used as a preliminary step in motor or gearmotor selection. Torque Unitsįor example, assume that it is necessary to determine the power required to drive a torque load of 3 oz-in at a speed of 500 RPM. These factors include the conversion from RPM to rad/sec where applicable. Conversion factors for commonly used torque and speed units are given in the following table. Such a reference is used to convert the torque-speed product to units of power (Watts). A reference that provides conversion tables is very helpful for this purpose. It is important to consider the units involved when making the power calculation. This is accomplished by simply multiplying the velocity in RPM by the constant (2 x ∏) /60: In calculating rotational power, it is necessary to convert the velocity to units of rad/sec. The most commonly used unit for angular velocity is rev/min (RPM). In the case of rotational motion, the analogous calculation for power is the product of torque multiplied by the rotational distance per unit time. For linear motion, power is the product of force, multiplied by the distance per unit time. Physically, power is defined as the rate of doing work. In addition to frictional losses, there are power losses in Joules/sec (Iron losses in coreless DC motors are negligible). In DC motors, electrical power (P el) is converted to mechanical power (P mech). Below we have provided some important formulas and calculation details to determine mechanical power requirements of a DC motor, to calculate torque, and for determining the steady state temperature increase of a motor.Ĭalculating Mechanical Power Requirements
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