Electrical World

Special Machines (Permanent Magnet Synchronous Motor)  Interview Questions [1] What is the PMSM? In medium and small size synchronous motors, DC field can be produced by permanent magnets. Such kind of motors are called as PMSM [2] What are the advantages and disadvantages of PMSM Advantages Elimination of field copper loss Higher power density Lower rotor inertia Robust construction Disadvantages Power rating low Motor power factor can not be controlled because of field excitation cannot be controlled [3] What are the classification of PMSM Based on construction     Surface mounted PMSM     Interior mounted PMSM Based on the nature of voltage induced     Sinusoidally excited     Trapezoidally excited [4] Give some applications of PMSM Robots Machine tools [5] Define torque angle The angle between excitation emf and supply voltage. This angle is called torque angle or load or power angle . [6] What are the diffe...