From Motors & Drives: A Practical Technology Guide
The following information will serve as a final book summary. This will assist the reader in preparing for the final "Check Your Knowledge" section that follows. For a thorough review and before the final "Check Your Knowledge" is taken, it would be helpful to review all chapter summaries and questions.
What is a Drive? Why Drives are Applied
There are many reasons to use variable speed drives, but basically they fall into three categories of efficiency gains, process changes and improvements, and system coordination. As an example, efficiency of AC motors can be quite high, which thereby reduces the overall monthly cost of operating the system. Variable speed drives also allow for changes in the process, as well as process improvements. Some processes operate at less than full speed, so optimum product quality can be achieved. System coordination is a major factor in today's industrial environment. AC and DC drive systems are typically applied in a manufacturing process. Computers control the entire process, from in feed rate to output of the machine.
A generic drive system includes the following components: machine, coupler, motor, drive, controller and power source. No matter what type of system is discussed, these main components are involved.
There are various types of variable speed drives available for use in industry. The basic categories are mechanical, hydraulic and electrical/electronic. Electronic drives can be further divided into the following categories of eddy current, rotating DC, DC converters and variable frequency AC.
Review of Basic Principles
All electrical circuits...
Products & Services
Topics of Interest
This is the final exam for the book. Reviewing the "Check Your Knowledge" questions in each chapter would be helpful before taking this final set of questions. 1. How is line notching...
The following information will serve as a final book summary. This will assist the reader in preparing for the final "Check Your Knowledge" section that follows. For a thorough review and before the...
Chapter 1 1. What is a drive? 2. What are three reasons why variable-speed drives are used? 3. Name three factors that cause the efficiency of an AC motor...
To some, motor speed control is somewhat of a mystical science, a science that causes motors and machines to sometimes operate in unexpected ways. Over 30 years ago, AC drives were considered "new...
Overview Figure 6.1: Classification of machines for drives. An electrical machine is the workhorse in a variable-speed drive system, and its function is to convert electrical energy into...
