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Why do permanent magnets are preferred for the rotors of PMBLDC motor?

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Math Educator for Std.11th ,12th , Engineering Entrance and Degree Level with 11+ Years Experience

The use of permanent magnets (PMs) in electrical machines in place of electromagnetic excitation results in many advantages such as no excitation losses, simplified construction, improved efficiency, fast dynamic performance, and high torque or power per unit volume.
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math mathician,networking,electronics

becoz permanent magnet have permanent poles, so the replel each other easily
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Assistant Professor/Motivational SPeaker

Permanent magnet brushless DC (PMBLDC) motors are the latest choice of researchers due to their high efficiency, silent operation, compact size, high reliability and low maintenance requirements. These motors are preferred for numerous applications; however, most of them require Sensor-less control of...
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Permanent magnet brushless DC (PMBLDC) motors are the latest choice of researchers due to their high efficiency, silent operation, compact size, high reliability and low maintenance requirements. These motors are preferred for numerous applications; however, most of them require Sensor-less control of these motors. The operation of PMBLDC motors requires rotor- position sensing for controlling the winding currents. The Sensor-less control would need estimation of rotor position from the voltage and current signals, which are easily sensed. read less
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Industrial Business Development and production

like pole repel each other
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Good at core subjects

By using permanent magnets, rotor windings and mechanical commutation can be eliminated simplifying manufacture, reducing costs and improving reliability. At the same time efficiency is improved by the elimination of the need for excitation of the rotor windings and by avoiding the frictional losses...
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By using permanent magnets, rotor windings and mechanical commutation can be eliminated simplifying manufacture, reducing costs and improving reliability. At the same time efficiency is improved by the elimination of the need for excitation of the rotor windings and by avoiding the frictional losses associated with the commutator. read less
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