Brushless permanent-magnet and reluctant motor drives
Author(s)
Bibliographic Information
Brushless permanent-magnet and reluctant motor drives
（Monographs in electrical and electronic engineering, 21）
Clarendon Press , Oxford University Press, 1989
- : U.S.
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Note
Bibliography: p. [192]-199
Includes index
Description and Table of Contents
Description
More than a century after Faraday, there remains in the field of motors and drives enormous scope for innovation. This presentation of the theory of brushless d.c. drives will help engineers to appreciate the potential of such motors and apply them more widely, taking advantage of developments in permanent-magnet materials, power semiconductors, electronic control and motor design (including CAD). The objective is not to "sell" particular technologies or to teach design, but to lay out the basic principles and to raise the general credibility and acceptance of new technology that many engineers have striven to establish. The sections on permanent magnets and magnetic circuits should assist in the exploitation of PM materials. The approach taken is essentially academic: theory and calculation predominates, but the text is augmented throughout with worked examples of interest to practising electronics engineers. Problems with practical applications are also presented.
Table of Contents
- Introduction: motion control systems
- why adjustable speed?
- structure of drive systems
- new technology
- which motor? - the d.c. and PM d.c. commutator motors, the induction motor drive, the brushless d.c. PM and PM a.c. synchronous motors. Part 1 Principles of sizing, gearing and torque production: sizing an electric motor
- choice of gear ratio in geared drives
- basic principles of torque production. Part 2 Permanent-magnet materials and circuits: B-H loop and demagnetization characteristics
- temperature effects - reversible and irreversible losses
- mechanical properties, handling and magnetization
- application of permanent magnets in motors. Part 3 Squarewave permanent-magnet brushless motor drives: why brushless d.c.?
- magnetic circuit analysis on open-circuit
- squarewave brushless motor - torque and e.m.f. equations
- torque/speed characteristic - performance and efficiency
- alternative formulations for torque and e.m.f.
- motors with 120 degrees and 180 degrees magnet arcs - commutation
- squarewave motor - winding inductances and armature reaction
- controllers
- computer simulation. Part 4 Sinewave permanent-magnet brushless motor drives: ideal sinewave motor - torque, e.m.f. and reactance
- sinewave motor with practical windings
- phasor diagram
- sinewave motor - circle diagram and torque/speed characteristic
- torque per ampere and kVa/kW of squarewave and sinewave motors
- permanent magnet versus electromagnetic excitation
- slotless motors
- ripple torque in sinewave motors. Part 5 Alternating-current drives with PM and synchronous-reluctance hybrid motors: rotors
- A.c. windings and inductances
- steady-state phasor diagram
- circle diagram and torque-speed characteristic
- cage-type motors. Part 6 Switched reluctance drives: the switched reluctance motor
- poles, phases and windings
- static torque production
- partition of energy and the effects of saturation
- dynamic torque production
- converter circuits
- control, current regulation, commutation
- solid rotors.
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