Problem Statement Objective Scope Introduction

1.2 Problem Statement

A slip ring applications have been widely used on slower speed of wound rotor motor. The amount of the maintenance for the motor increases as to check the wear and tear of the slip ring regularly. The uneven surface of slip ring due to continuous contact with carbon brush may produce unstable current of the motor which subsequently will increase the power loss of the motor. By having brush lifting gear for slip ring, it will reduce the contact duration and minimize the wearing process of the slip ring.

1.3 Objective

There are some objectives of development of brush lifting gear for slip ring motor. The objectives are : a. To understand the problem pertaining carbon brushes and slip ring of wound rotor motor. b. To develop brushes lifting gear slip ring for wound rotor motor.

1.4 Scope

The main target of this project is to develop the carbon brush and slip ring lift up mechanism for slip ring wound rotor motor. This method is designed to lift up the carbon brush after the motor has reached its steady state speed. CHAPTER 2 LITERATURE REVIEW

2.1 Introduction

This chapter discus about the summary of the transactions, journals, proceedings, original reports and book. This source is very helpful in finishing the project. The purpose is to discuss about for perspective and method that used so that project can be studied and produced. This chapter is also act as reference to the project in problem solving. Project comprehension is important as guide and result something the study could not be valued without compared to theory. This chapter also sets out briefly on theory related materials that are being used in project so that comprehension related can be increased. Topic which include in this chapter were related development carbon brush lifting gear for slip ring motor. This project is to develop brush lifting gear for slip ring of wound rotor motor. Wound rotor motor has the rotor windings connected to an external resistance through carbon brushes and slip rings assembly. When the brushes are in continuous contact with the slip rings during normal operation of the motor, the brushes and the slip rings will experience premature wearing. The development for this project is to lift up the carbon brushes immediately after the motor has reached to its steady state speed. As a result, it will minimize the amount of wear and tear of the slip ring and hence, will avoid instability on the running current.

2.2 Carbon Brush Lifting Gear System