The brushless dc motor is a permanent-magnet synchronous machine controlled in such a way that the frequency of the applied voltages is proportional to the rotor speed. This type of motor is becoming increasingly popular and is replacing conventional types of dc machines and synchronous machines in servo and variable speed applications. One type of inverter, the 120 degree inverter, does not require rotor position sensing hardware. A second type of inverter is the 180 degree inverter. In this project, the difference between these two inverters is explained and a numerical example is used to show the differences between these two types of drives.
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