# HW6 - ECE321/ECE595 Spring 2012 Homework 6 Problem 1...

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ECE321/ECE595 Spring 2012 Homework 6 Problem 1 – Permanent Magnet DC Machine A permanent magnet dc machine has r a = 8 and k v = 0.01 Vs/rad. The shaft load torque is approximated as T L = K ϖ r , where K = 5•10 -6 Nms. The applied voltage is 6 V and B m = 0. Calculated the steady-state rotor speed r in rad/s. Problem 2 – Shunt Connected DC Machine The parameters of a shunt connected dc machine are r a = 10 , R f = 50 , and L AF = 0.5 H. Neglect B m . The applied voltage is 25 V. Calculate (a) the steady-state stall torque, (b) the no- load speed, and (c) the steady-state rotor speed with T L = 3.75•10 -3 ϖ r . Problem 3 – PM DC Machine Performance A PM DC machine has a back emf constant of 0.15 Vs, and an armature resistance of 300 m . The armature voltage is 25 V, and the load torque may be expressed 3 400 2 = r l T Find the rotor speed, the armature current, and the efficiency. Problem 4 – PM DC Machine Parameters

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## This note was uploaded on 02/19/2012 for the course ECE 321 taught by Professor Staff during the Spring '08 term at Purdue University-West Lafayette.

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HW6 - ECE321/ECE595 Spring 2012 Homework 6 Problem 1...

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