Digital Version

Spring 2017

Microstructure and Mechanism of Coercivity Enhancement of Sintered Nd-Fe-B Magnet By Grain Boundary Diffusion
Rare earth element (REE) based Nd-Fe-B magnets have been widely used because of their excellent magnetic properties. The applications of Nd-Fe-B rare earth permanent magnets include hybrid electric vehicles (HEVs), power generators for wind turbines, high performance industrial motors, hard disk drives (HDD) for computers, travelling wave tubes for satellite communications, headphones and speakers, washing machines and other consumer electronic devices.

Recent Developments and Trends in Nd-Fe-B Magnets
Nd-Fe-B magnets have a wide variety of applications in aerospace, medical, semiconductor, telecommunications, power generation, oil & gas exploration and automotive industries.  There have been many new developments in recent years including high energy Nd-Fe-B grades, heavy rare earth free high intrinsic coecivity Nd-Fe-B grades, radially oriented anisotropic rings and improved manufacturing processes.

Eddy Current Detection of Mechanical Faults in Permanent Magnets and in Magnet Blanks Prior to Magnetization
Modern applications in automotive, energy and consumer industries apply permanent magnets in various forms. In order to achieve an optimal performance in their application, the characteristics of permanent magnets and magnet blanks prior to magnetization must be carefully controlled. Beside the accurate measurement of all three components of the magnetic field, as well as inhomogeneity measurement of the magnetic fields around permanent magnets, it is increasingly important to detect in the QA process the mechanical faults in magnets and magnet blanks, such as cracks and material inhomogeneity.

Is There an Optimum Price-Performance Metric for Permanent Magnet Materials?
Attend any magnetics conference or seminar and I can guarantee a slide will appear in someone’s presentation showing something along the lines of the year of introduction of a permanent magnet material versus the corresponding (BH)max.

Permanent Magnet Mistakes, Part Six
The sixth group of mistakes on my list are:
13. Assuming that large magnetized parts are easy and safe to handle
14. Failing to consider natural product variations in both magnetic properties and dimensions
15. Assuming that the attractive and repulsive forces are  equivalent and can be precisely calculated

 Click Here to Read this Issue

Winter 2016

How to Assure Every Rare Earth (or Any) Magnet Meets Your Requirements 100 Percent of the Time?
So you have designed and thoroughly tested your revolutionary new magnetic device and are ready to place an order with your chosen magnet supplier.  How do you assure the magnets you receive will meet your (and your customers) requirements 100 percent of the time?

The Permanent Magnet Industry Reference Book
It is common to strike up a conversation on an airline flight and be asked the question, “What industry do you work in?”  My answer is, “I’m involved in the magnet industry.”  The resulting blank look on my fellow passenger’s face makes it clear that he’s reflecting on the realtor’s magnetic calendar holding the children’s homework on the refrigerator.  The average Joe has little appreciation of how many magnets are utilized in everyday products!

Post Manufacturing Equalization of Magnetic Arrays and Assemblies
Permanent magnets (PM) are found in motors and actuators in many devices such as home appliances, water pumps, loudspeakers, electric tools, watches and automation (servomotors). The typical number of magnets in a vehicle exceeds 200; they are key components of the electrical actuators found in power steering, windshield wipers, adjustable mirrors, speedometer and other gauges, audio controls etc. PM brushless machines can also be found in elevators, in wind power generators, in boats, in AC units, etc. Tablet and smartphone covers are usually magnetically attached using embedded PM arrays.

2017 Resource Guide
Magnets • Materials • Equipment & Services • Supplies & Components

Spontaneous Thoughts: Permanent Magnet Mistakes, Part Four
We continue with the fourth blog in this series, describing the many types of mistakes made with permanent magnets. Again, my intent is to help engineers in the future avoid the mistakes made in the past, and not to embarrass anyone.

Click Here to Read this Issue

Summer 2016

MBT_Summer2016_coverFFeatures & Columns:

- Extending the Limits of the Sm2Co17 System
- Advances in Manufacture of Low or No Heavy Rare Earths NdFeB Magnets
- New Measurement Technique Characterizes Permanent Magnets
- The Ambition to Get Highest Flux Densities, Is It Always Reasonable?
- Spontaneous Thoughts: Permanent Magnet Mistakes, Part Two

Read Digital Issue Here

Spring 2016

MBT_Spring2016_coverFFeatures & Columns:

- Permanent Magnets in a Changing World Market
- Design Considerations Using Permanent Magnets
- Insulated Iron Powders, SMC, Current State and Future Possibilities
- The Design of a Permanent Magnet Motor for a Direct Drive Fan Application
- Tailoring of Pole Shapes of Multipolar Injection Molded Magnets
- Spontaneous Thoughts: Seventeen Mistakes People Make with Permanent Magnets

View Digital Issue

Winter 2015

MBT_Winter2015_coverFFeatures & Columns:

- What the Heck Happened to the Magnet Industry?
- An Introduction to Resonant Inductive Power Transfer
- Spontaneous Thoughts: Small Ball
- 2016 Resource Guide
- Magnetics 2016: Preview

View Digital Issue

Summer 2015

MBT_Summer2015_coverFeatures & Columns:

- Bonded Magnets: A Versatile Class of Permanent Magnets
- Spintronics on Paper: The Whys and Wherefores
- Spontaneous Thoughts: The Rate Determining Step

View Digital Issue

Spring 2015

MBT_Spring2015_coverFeatures & Columns:

- First-Order-Reversal-Curve Analysis of Multi-Phase Ferrite Magnets
- Magnetics Design Tool for Power Applications
- Magnet Inspection Tool with High Magnetic and Mechanic Accuracy
- Spontaneous Thoughts: The Patent Challenge

View Digital Issue