Appendix One

Introduction to Closed-loop Control

A1.1. Outline of Approach

The aim of this Appendix is to help readers who are not familiar with closed-loop control and feedback to feel confident when they meet such ideas in the drives context. In line with the remainder of the book, the treatment avoids mathematics where possible, and in particular it makes only passing reference to transform techniques. This approach is chosen deliberately, despite the limitations it imposes, in the belief that it is more useful for the reader to obtain a sound grasp of what really matters in a control system, rather than to become adept at detailed analysis or design.

Traditionally, control ideas are introduced at the same time as the Laplace transform technique. ...

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