By Duane C. Hanselman
Written for electric, electronics, and mechanical engineers accountable for designing and specifying automobiles, the e-book 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 normal motor layout, it logically progresses to a collection of extra complicated, but simply comprehensible, suggestions for designing brushless permanent-magnet cars. furthermore, the writer totally explains suggestions for magnetic modeling and circuit research, exhibits how magnetic circuit research applies to motor layout, describes all significant points of motor operation and layout in basic mathematical phrases, develops rigourous layout equations for radial flux and axial flux vehicles, and illustrates simple motor force schemes. All universal motor layout phrases are in actual fact outlined and a wealth of charts, tables and equations are integrated.
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Extra info for Brushless Permanent Magnet Motor Design
Therefore, in terms of Pc, a permeance coefficient equal to zero is operation at the coercivity B~0, H = -Hc, and a permeance coefficient equal to infinity is operation at the remanence B= Br, H=0. Permanent magnet materials such as samarium-cobalt and NdFeB materials have straight demagnetization curves throughout the second quadrant at room temperahire as shown in Fig. 2-19. Some ferrite magnets have a knee or bend in their demagnetization curve at room temperature and at low flux density values.
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.
The dominance of the air gap also implies that the exact magnetic characteristics of the core do not have a great effect on the solution provided that the permeability of the core remains high. This is fortunate because the core is commonly made from materials having nonlinear magnetic properties. Before moving on it is important to note that the magnetic circuit shown in Fig. 2-13 ignores flux in the air surrounding the core away from the air gap. , air) is on the order of 10 . As a result, current stays confined to the conductors in an electric circuit.