1. Direct torque control explains what DTC is; why and how it has evolved; the basic theory behind its success; and the features
and benefits of this new technology.
2. EU Council Directives and adjustable speed electrical power drive systems is to give a straightforward explanation of how the various EU Council Directives relate to power drive
systems.
3. EMC compliant installation and configuration for a power
drive system assists design and installation personnel when trying to ensure compliance with the requirements of the EMC
Directive in the user’s systems and installations when using AC
drives.
4. Guide to variable speed drives describes basics of different variable speed drives (VSD) and how they are used in industrial
processes.
5. Bearing currents in modern AC drive systems explains how to avoid damages.
6. Guide to harmonics with AC drives describes harmonic distortion, its sources and effect, and also distortion calculation
and evaluation with special attention to the methods for reducing harmonics with AC drives.
7. Dimensioning of a drive system. Making dimensioning correctly is the fastest way of saving money. Biggest savings can
be achieved by avoiding very basic mistakes. These dimensioning basics and beyond can be found in this guide.
8. Electrical braking describes the practical solutions available in reducing stored energy and transferring stored energy back
into electrical energy.
9. Guide to motion control drives gives an overview of high performance drives and motion control.
10. Functional safety guide introduces the Machinery Directive and the standards that must be taken into account when designing a machine, in order to ensure operational safely.
Contents
Chapter 1 - Introduction
General
This manual’s purpose
Using this guide
What is a variable speed drive?
Summary
Chapter 2 - Evolution of direct torque control
DC motor drives
Features
Advantages
Drawbacks
AC drives - Introduction
AC drives - Frequency control using PWM
Features
Advantages
Drawbacks
AC drives - Flux vector control using PWM
Features
Advantages
Drawbacks
AC drives - Direct torque control
Controlling variables
Comparison of variable speed drives
Chapter 3 - Questions and answers
General
Performance
Operation
Chapter 4 - Basic control theory
How DTC works
Torque control loop
Step 1 Voltage and current measurements
Step 2 Adaptive motor model
Step 3 Torque comparator and flux comparator
Step 4 Optimum pulse selector
Speed control
Step 5 Torque reference controller
Step 6 Speed controller
Step 7 Flux reference controller
Download Timer
