Question

What is the formula for the minimum width of the tooth?

(a) minimum width of tooth = flux * pole proportion * (number of stator slots / number of poles) * length * 1.8

(b) minimum width of tooth = flux / pole proportion * (number of stator slots / number of poles) * length * 1.8

(c) minimum width of tooth = flux * pole proportion / (number of stator slots / number of poles) * length * 1.8

(d) minimum width of tooth = flux * pole proportion * (number of stator slots / number of poles) * length / 1.8

The question was posed to me in an interview.

I need to ask this question from Slot Dimensions in chapter Design of Synchronous Machines of Design of Electrical Machines

Answer 1

Right option is (b) minimum width of tooth = flux / pole proportion * (number of stator slots / number of poles) * length * 1.8

For explanation: The flux value, pole proportion and the length values are first obtained. Then the ratio of the number of stator slots to number of poles is obtained and on substitution gives the minimum width of tooth.