Motor Power
Motor power refers to the amount of power or energy that a motor can generate and deliver to perform mechanical work. The motor power indicates the capability of a motor to convert electrical energy into mechanical energy and drive a load or perform a specific task. In the context of electric motors, the power rating is an essential specification that users consider when selecting a motor for a particular application. The power requirements depend on the type of work the motor needs to do, the speed at which it needs to operate, and the torque (rotational force) it must provide.
Motor Power Types
Input Power - This is the electrical power supplied to the motor. It represents the power consumed by the motor from the electrical source.Output Power - This is the mechanical power delivered by the motor to the driven equipment or load. It takes into account factors like efficiency and is also measured in watts or kilowatts.
Rated Power - The power at which a motor is designed to operate optimally and efficiently over an extended period. It is often a key parameter in motor specifications.
Motor Power Input Formula |
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\( P_{in} \;=\; I \cdot V \cdot PF \) (Motor Power Input) \( I \;=\; \dfrac{ P_{in} }{ V \cdot PF }\) \( V \;=\; \dfrac{ P_{in} }{ I \cdot PF }\) \( PF \;=\; \dfrac{ P_{in} }{ I \cdot V }\) |
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| Symbol | English | Metric |
| \( P_{in} \) = output power | \(W\) | \(kg-m^2\;/\;s^3\) |
| \( I \) = current | \(A\) | \(C\;/\;s\) |
| \( V \) = voltage applied | \(V\) | \(kg-m^2\;/\;s^3-A\) |
| \( PF \) = Power Factor | \(dimensionless\) | \(dimensionless\) |
Motor Power Output Formula |
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\( P_{out} \;=\; \dfrac{ \tau }{ \omega }\) (Motor Power Output) \( \tau \;=\; P_{out} \cdot \omega \) \( \omega \;=\; \dfrac{ \tau }{ P_{out} }\) |
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| Symbol | English | Metric |
| \( P_{out} \) = output power | \(W\) | \(kg-m^2\;/\;s^3\) |
| \( \tau \) (Greek symbol tau) = torque | \(lbf-ft\) | \(N-m\) |
| \( \omega \) (Greek symbol omega) = angular velocity | \(deg\;/\;sec\) | \(rad\;/\;s\) |
Motor Power Formulas\(V\) = Voltage - \(I\) = Amps - \(PF\) = Power Factor - \(\eta\) = Efficiency - \(P\) = Power |
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| To Find | Direct Curren | Alternating Current | ||
| Single Phase | Two Phase Four Wire | Three Phase | ||
| Power | \(V \; I \; \%\eta \) | \(V \; I \; \%\eta \; PF\) | - | \(1.732 \;V \; I \; \%\eta \; PF\) |
Tags: Power Horsepower Motor