Motor Frictional Loss: Torque Required at Any Freq?

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SUMMARY

The discussion centers on the torque requirements of electric motors at varying frequencies. It is established that while initial torque is crucial for overcoming frictional losses, less torque is needed at higher RPMs due to back EMF and inertia effects. The conversation highlights that bearing friction increases proportionally with speed, while windage drag escalates with the square of the speed. Understanding these dynamics is essential for optimizing motor performance.

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  • Understanding of electric motor operation principles
  • Knowledge of torque and its relationship with RPM
  • Familiarity with back EMF in electric motors
  • Basic concepts of friction and windage drag
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  • Explore methods to minimize bearing friction in electric motors
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Physicist3
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Is the same torque required at any freq in order to overcome these losses?
 
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you should tell more about what your talking exactly , well from the section you posted this I assume your talking about electric motors, which in most cases have only two bearings , all other parts ar non friction ones , except for the commutator in dc or AC synchronous motors, which for friction loss is extremely small.
Every motor needs to exert most torque at the beginning of operation , the higher the rotor goes in rpm the less force is needed to achieve even higher ones and overcome the same friction , because of back EMF and also because of inertia.
 
As the speed of an electric motor rises the bearing friction will rise in proportion to the speed.
As the speed of an electric motor rises the windage drag will rise in proportion to the square of the speed.
 

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