What is the formula for the area of the magnet in the design of PMDC motors?(a) area of magnet = flux * 4.95 * residual flux density(b) area of magnet = flux / 4.95 * residual flux density(c) area of magnet = flux * 4.95 / residual flux density(d) area of magnet = 1/flux * 4.95 * residual flux densityI had been asked this question in a national level competition.This key question is from Design Steps and Considerations topic in division Design of Permanent Magnet (PM) DC Motors of Design of Electrical Machines

What is the formula for the area of the magnet in the design of PMDC m

1.	What is the formula for the area of the magnet in the design of PMDC motors?(a) area of magnet = flux * 4.95 * residual flux density(b) area of magnet = flux / 4.95 * residual flux density(c) area of magnet = flux * 4.95 / residual flux density(d) area of magnet = 1/flux * 4.95 * residual flux densityI had been asked this question in a national level competition.This key question is from Design Steps and Considerations topic in division Design of Permanent Magnet (PM) DC Motors of Design of Electrical Machines
Answer» The correct choice is (b) area of magnet = flux / 4.95 * residual flux density Explanation: FIRST the residual flux density is CALCULATED. NEXT, the flux is calculated and substitution in the formula GIVES the area of magnet.

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