Theory of Brushless Permanent Magnet Motor Design Reference

Theory of Brushless Permanent Magnet Motor Design Reference: (Brushless Permanent Magnet Motor Design) Dr. Duane Hanselman. 2 nd. Edition.

Short circuit case Open circuit case Figure (2) The permanent magnet in s. c. and in o. c. case

ﻣﻌﺎﻣﻞ ﺍﻟﻤﻨﺎﻓﺬﻩ Figure (4) Influence of temperature on the normal demagnetization curve

Figure (5) a rectangular permanent magnet and its circuit model

Example: + Figure (6) Norton’s equivalent circuit of the PM

Permanent Magnet, Magnetic Circuit Model ﻣﻌﺎﻣﻞ ﺍﻟﻨﻔﺎﺫﻳﻪ _ Figure (7) Dynamic operation of the magnet around an operating point

From figure (7) and due to the operating point it is clear that

Figure (8)

Figure (9) an arc-shaped magnetized radially

Let us consider the described fundamental motor shown in figure (10) in this part of lecture, assuming rotational motion and surface-mounted magnets. Figure (10) fundamental motor structure and associated flux path

Figure (11) A magnetic circuit model for the structure shown in figure (10)

Figure (12) simplification of the magnetic circuit shown in figure (11)