By Duane C. Hanselman
Written for electric, electronics, and mechanical engineers answerable for designing and specifying vehicles, the booklet offers information of brushless DC and synchronous automobiles, in addition to either radial and axial motor topologies. starting with a dialogue of the basics of known motor layout, it logically progresses to a collection of extra complex, but simply comprehensible, innovations for designing brushless permanent-magnet automobiles. furthermore, the writer absolutely explains strategies for magnetic modeling and circuit research, indicates how magnetic circuit research applies to motor layout, describes all significant elements of motor operation and layout in basic mathematical phrases, develops rigourous layout equations for radial flux and axial flux cars, and illustrates easy motor force schemes. All universal motor layout phrases are basically outlined and a wealth of charts, tables and equations are integrated.
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Extra info for Brushless Permanent Magnet Motor Design
2-7 where an air gap is created between two blocks of highly permeable material. Flux flow, as depicted by the idealized flow lines in Fig. 2-7, passes from one block to the other through the air gap and creates an MMF drop between the two blocks. The permeance of this air gap Pg is difficult to model because flux does not flow straight across the air gap near the edges of the blocks. This occurs because the air in the gap has the same permeability as the air near the gap, therefore some flux fringes into the surrounding air as shown in Fig.
Of these, ferrite types are the most popular because they are inexpensive. On the other hand, the rare earth types, samarium-cobalt and NdFeB offer the highest performance. NdFeB magnets are more popular in higher performance applications because they are much cheaper than samarium cobalt. Most magnet types are available in both bonded and sintered forms. Bonded magnets are formed by suspending powdered magnet material in a nonconductive, nonmagnetic resin. Magnets formed in this way are not capable of high performance since a substantial fraction of their volume is made up of nonmagnetic material.
The flux (p flowing around the core is due to the current i and the direction of flux flow is clockwise because of the right hand rule. Using the magnetic circuit equivalent of Ohm's law, the flux produced is given by where R is the reluctance seen by the MMF source. 3) This expression shows that flux linkage is directly proportional to coil current. As a result, it is common to define the constant relating current to flux linkage as inductance O N R —' Figure 3-1. Single excited magnetic structure and its magnetic circuit model.
Brushless Permanent Magnet Motor Design by Duane C. Hanselman