Permanent Magnet Synchronous Motor (PMSM)
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The permanent magnet synchronous motor (PMSM) represents a cross between an AC induction motor (ACIM) and a brushless DC motor (BLDC). Both, PMSM and BLDC motors have a permanent magnet rotor and windings on the stator. The stator structure with windings constructed to produce a sinusoidal flux density in the airgap of the machine, resembles that of an induction motor. The power density of permanent magnet synchronous motors is higher than induction motors with the same ratings as there is no stator power dedicated to the magnetic field production. Nowadays, permanent magnet synchronous motors are designed not only to be more powerful but also with lower mass and lower moment of inertia.
Characteristics of a PMSM Motor
- Close relative of the brushless DC (BLDC) motor
- Permanent magnet rotor and windings on the stator
- Back Electro Magnetic Field (EMF) waveforms of the windings are sinusoidal
- Controlled using sinusoid waveforms to match the back EMF waveform of each winding
Typical Block Diagram - Motor Control