A simple electrical motor has three components: windings, armature, and housing. These three components have reliabilities of .97, .992, and .999. There is no possibility of redundant parts. The motor must have an overall reliability of at least 0
980, according to the product line manager who will use the motor as an input. What would you do to redesign the motor to meet this specification? Discuss, including a recalculation to meet the standard.
Since no backup is possible, individual components must be redesigned. The windings represent the weak link, and represent the obvious choice (windings have to be improved at least some or overall reliability will not be able to exceed 0.980 ). If only the windings are improved, their new reliability must be at least 0.980 / [(0.992 )(0.999 )] = 0.988893. (The last decimal was rounded up to ensure at least .980 for the system.)
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