Thyristor DC Drives

Types of DC drives...

Senior Electrical Maintenance engineers above the age of forty or fifty sometimes find themselves outdated in their knowledge. With this background in mind an attempt is made here to describe certain concepts which one finds in old analog dc drives. Such drives are still in use in a large number of industries. Digital drives are different only in the manner in which these basic functions are achieved. Understanding these will help in solving many problems irrespective of the type of the drive. These details will help in better understanding of the subject which is otherwise learnt in bits and pieces by many over a period of time as they grow in industry. Like any other classification, there are many ways in which the DC drives can be classified. Whatever may be the way, the main purpose is to divide and learn. i.e. learn the topic by breaking it down in small areas. Classification can be like... -three phase or single phase -analog or digital -constant speed application or constant current application -Semicontrolled or fullycontrolled etc.