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+// Electric Machinery and Transformers
+// Irving L kosow 
+// Prentice Hall of India
+// 2nd editiom
+
+// Chapter 9: POLYPHASE INDUCTION (ASYNCHRONOUS) DYNAMOS
+// Example 9-1
+
+clear; clc; close; // Clear the work space and console.
+
+// Given data
+phase = 3 ; // Number of phases
+n = 3 ; // Slots per pole per phase
+f = 60 ; // Line frequency in Hz
+
+// Calculations
+// case a
+P = 2 * n ; // Number of poles produced
+Total_slots = n * P * phase ; // Total number of slots on the stator
+
+// case b
+S_b = (120*f)/P ; // Speed in rpm of the rotating magnetic field
+
+// case c
+f_c = 50 ; // Changed line frequency in Hz
+S_c = (120*f_c)/P ; // Speed in rpm of the rotating magnetic field
+
+// Display the results
+disp("Example 9-1 Solution : ");
+printf(" \n a: P = %d poles \n    Total slots = %d slots \n", P ,Total_slots );
+
+printf(" \n b: S = %d rpm  @ f = %d Hz \n ", S_b , f );
+
+printf(" \n c: S = %d rpm  @ f = %d Hz ", S_c ,f_c );