Motor torque is the rotational force produced by a motor. It represents the motor's ability to twist or turn a load, driving mechanical systems like wheels, gears, or shafts. Torque depends on the motor's power and speed, with higher torque enabling greater force to overcome resistance or accelerate a load. In electric motors, torque is generated by the interaction of magnetic fields, while in combustion engines, it comes from the force of expanding gases on pistons.
Motor Torque Formula |
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\( \tau \;=\; \dfrac{ HP \cdot 5252 }{ S } \) (Motor Torque) \( HP \;=\; \dfrac{ \tau \cdot S }{ 5252 } \) \( S \;=\; \dfrac{ HP \cdot 5252 }{ \tau } \) |
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| Symbol | English | Metric |
| \( \tau \) (Greek symbol tau) = Motor Torque | \(lbf-ft\) | \(N-m\) |
| \( HP \) = Horsepower | \(lbf-ft\;/\;sec\) | \(J\;/\;s\) |
| \( S \) = Speed | \(rpm \;/\; sec\) | \(rpm \;/\; s\) |
Key Points about Motor Torque
Work Capability - Higher torque means the motor can perform more rotational work. For example, it can turn a heavier load or overcome greater resistance.
Acceleration - High torque allows a motor to accelerate a load more quickly.
Responsiveness - In applications like electric vehicles, high torque translates to quicker response when the accelerator is pressed.
Low-Speed Operation - Some applications, like industrial shredders or servo presses, require high torque even at low rotational speeds
