Certification is essentially a form of quality and credibility assurance. According to the definitions provided by the International Organization for Standardization (ISO) and the International Electrotechnical Commission (IEC), certification refers to a conformity assessment activity in which an accredited certification body verifies that a company’s products, services, or management systems comply with relevant standards, technical specifications (TS), or mandatory requirements. The benefits of certification are clear: It serves as the “credit passport” of a product, a “health check report” of

In our earlier article on Mitigating Eddy Current Losses in Rare-earth Permanent Magnets, we explained why eddy currents occur and how they can lead to heat generation and demagnetization in high-speed motors. Building on that foundation, this article introduces one of the most effective engineering solutions for reducing eddy current loss—magnet segmentation. A magnet produced using segmentation technology is often referred to as a laminated magnet, segmented magnet, or sectioned magnet. The concept is straightforward: instead of using a single

How NdFeB Magnets Are Tested: Surface Field, Flux, Magnetic Moment, and Density Today, we will focus on the principles and methods used for relative magnetic property testing of sintered NdFeB magnets. NdFeB products come in many different shapes and sizes, and while most customers specify the magnetic grade, some also request comparative magnetic performance tests on samples. Typical customer requests may include: checking the surface magnetic field, measuring the magnetic flux, or verifying the magnetic moment of selected magnets. To

Origin of Magnetism in Permanent Magnets The magnetic properties of permanent magnets primarily come from their crystal structure, which allows them to become strongly magnetized. Even after the external magnetic field is removed, the magnet retains its magnetism. Therefore, the magnetization process (also called charging or polarization) is a critical step for permanent magnetic materials such as NdFeB (Neodymium-Iron-Boron) to obtain and exhibit strong magnetism. Isotropic vs. Anisotropic Magnets Magnetic materials can be classified into isotropic and anisotropic magnets: Type

Magnetic Flux Density (B) When a ferromagnetic or ferrimagnetic material is placed in an external magnetic field, its atomic magnetic moments tend to align with the applied field. This alignment creates an additional internal magnetic field, known as magnetization (M). The combined effect of the external magnetic field (H) and the magnetization (M) inside the material results in what we call magnetic flux density, symbolized as (B). In simple terms: (B) = The total magnetic field that the magnet actually

Surface Magnetic Field refers to the magnetic flux density measured at a specific point on the surface of a magnet. It is expressed in units of Gauss (Gs) or Tesla (T), where 1 T = 10,000 Gs. Because the magnetic field strength varies across different areas of a magnet’s surface, the value commonly referred to as the “surface magnetic field” usually represents the magnetic flux density at the center of the working surface of the magnet. Measuring Surface Magnetic Field

Introduction Building on our previous overview of the Production process of sintered Neodymium magnets, this series of articles delves deeper into the key technologies involved in the production of these magnets. In this first installment, we focus on the initial phase: raw material preparation and alloy melting and casting. Raw Material Preparation and Alloy Fabrication The fabrication of sintered Neodymium magnets starts with careful preparation of raw materials, typically involving pure metals or intermediate alloys. These materials are subjected to

Introduction Following our exploration of raw material preparation and alloy melting in the first part Neodymium Magnet Production Series Part 1 – Raw Material Preparation and Alloy Melting of our NdFeB magnet production series, we now turn our attention to a crucial subsequent phase: the milling process. Integral to the manufacturing of NdFeB (Neodymium-Iron-Boron) magnets, milling transforms the carefully prepared alloys into the fine powder necessary for crafting high-performance magnets. Milling, a process that determines the shape, average size, and distribution

Introduction Welcome back to our Neodymium Magnet Production Series. In our previous articles, we briefly introduced the production and preparation process of sintered Neodymium permanent magnets, giving a general overview of their production stages and key equipment (The Process of Making Neodymium Magnets). Building on this foundation, Part 3 delves into the critical stages of orientation and shaping. These processes are essential for determining the final performance of the magnets. After the intricate milling and alloy preparation, orientation and shaping

Introduction As we continue our detailed exploration of Neodymium Magnet production, this fourth part of the series shifts our focus to the vital processes of sintering, heat treatment, and machining. These stages are instrumental in refining and finalizing the magnets’ properties and form. Sintering and heat treatment are key to developing the magnets’ intrinsic magnetic qualities, while precise machining ensures their utility in diverse applications. This segment of our series will provide an in-depth look at how these processes contribute