Motor Frictional Loss: Torque Required at Any Freq?

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Torque requirements in electric motors vary with frequency, primarily due to frictional losses. Initially, motors require maximum torque to start, but as rotor speed increases, less torque is needed to maintain acceleration due to back EMF and inertia. Bearing friction increases proportionally with speed, while windage drag escalates with the square of the speed. Understanding these dynamics is crucial for optimizing motor performance across different operational frequencies. Effective management of torque and frictional losses enhances efficiency in electric motor applications.
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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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