永久磁铁的指南.pdf

MMPA PMG-88
PERMANENT
MAGNET
GUIDELINES
1. Basic physics of permanent magnet materials
l. Design relationships, figures of merit and optimizing techniques
ll. Measuring
IV. Maanetizil
v. Stabilizing and handling
V. Specifications, standards and communications
VIL. Bibliography
MAGNETIC MATERIALS PRODUCERS ASSOCIATION
SOUTH MICHIGAN AVENUE. SUITE 1000. CHICAGO LLNOS 606
INTRODUCTION
This guide is a supplement to our MMPA Standard No. 0100. It relates the
information in the Standard to permanent magnet circuit problems. The guide is
a bridge between unit property data and a permanent magnet component having
a specific size and geometry in order to establish a magnetic field in a given
magnetic circuit environment. The MMPA 0100 defines magnetic, therma
)hysical and mechanical properties. The properties given are descriptive in
nature and not intended as a basis of acceptance or rejection. Magnetic measure
ments are difficult to make and less accurate than corresponding electrical mea
nts. A considerable amount of detailed information must be exchanged
between producer and user if magnetic quantities are to be compared at two
locations. MMPA member companies feel that this publication will be helpful in
allowing both user and producer to arrive at a realistic and meaningful specifica
tion framework
Acknowledgment
The Magnetic Materials Producers Association acknowledges the out
standing contribution of Rollin J. Parker to this industry and designers
and manufacturers of products usingpermanent magnet materials. M
Parker the Technical Consultant to MMPA compiled and wrote this
document We also wish to thank the Standards and Engineering Com
mittee of PA which reviewed and edited this document
December 1987 3M
July 1988 5M
Auqust 1996
December 1998 1 M
CONTENTS
The guide is divided into the following sections
Glossary of terms and conversion tables-
A very im
the whole basis of
communication in the magnetic material industry involves
measurement of defined unit properties
Basic physics of permanent magnet materials-
An overview of the physics of permanent magnetism is felt to
be an important part of learning about permanent magnets
IL. Design relationships, figures of merit
and optimizing techniques-
Relationships are developed that allow materials to be
compared. The figures of merit are a guide to the best choice
of unit properties for effectively using the energy conversion
process in electromagnetic devices and systems
III. Measuring
IV. Magnetizing
V. Stabilizing and handling.
VI. Specifications, standards and communications
,25
Vll. Bibliography
.28
The sections on measuring, magnetizing and stabilizing contain the basic
considerations that allow the user to choose the techniques most suitable for
a specific permanent magnet component and operating environment