How to Identify the North and South Poles of Arc Magnets? Arc magnets, also known as curved magnets or tile magnets, are one of the most widely used magnet types in motors. Their unique curved design allows them to fit the rotor or stator more effectively, making them an essential component in various motor applications. [...]
Magnet Temperature Limits: Maximum Operating Temperature vs Curie Temperature Temperature is one of the key factors affecting the performance and reliability of permanent magnets. Beyond a certain temperature threshold, magnets may even undergo irreversible demagnetization. Therefore, understanding the temperature limitations of magnets is crucial when selecting suitable magnet materials for specific applications. When evaluating the [...]
Magnetic Domains: Understanding the Foundation of Magnetism Magnetic domains are the foundation of magnetism. In this post we’ll dive into the world of magnetic domains, and explore how they form, behave and the processes that determine their impact on magnetic materials. Understanding these will give you a deeper appreciation of how magnetism works in everyday [...]
Loss of Permanent Magnet Magnetization Due to Cold Temperatures Exposure Loss of magnetization due to cold temperatures exposure is a phenomenon that occurs in various types of materials, particularly in magnetic materials. This phenomenon is commonly known as the “superparamagnetic effect” or “temperature-dependent magnetization.” It results from the thermal agitation of the atomic spins in [...]
Loss of Permanent Magnet Magnetization Caused by Heat Exposure Loss of Magnetization Caused by Heat Exposure - Exposing a magnet to high temperatures can decrease its strength or permanently damage its structure. Usually this happens at very high temperatures, but for certain neodymium magnets this can happen as low as 60°C. Magnets are characterized by [...]
Measuring Magnetic Fields After reading this section you will be able to do the following: Determine how the direction and intensity of magnetic fields can be found. Describe how a field indicator and a Hall-effect meter work. Since it is impractical to measure the actual field strength within the material, all the devices measure the [...]
Circular Magnetic Fields: Distribution and Intensity After reading this section you will be able to do the following: Explain the distribution and intensity of magnetic fields around conductors Explain what the skin effect is As discussed previously, when current is passed through a solid conductor, a magnetic field forms in and around the conductor. The [...]
Longitudinal Magnetic Fields Longitudinal magnetic fields refer to magnetic fields that are oriented parallel to the direction of propagation of a wave or particle. These fields play a crucial role in various scientific and technological applications, including particle accelerators, plasma physics, astrophysics, and magnetic resonance imaging (MRI). In the context of particle accelerators, longitudinal magnetic [...]
Electricity and Magnetism After reading this section you will be able to do the following: Discuss what happens to a compass when a wire with electrical current is near. Describe the relationship between electricity and magnetism. Why does the compass respond when it is near an electrical wire with current flowing through it? We can [...]
Electromagnetic Fields After reading this section you will be able to do the following: Describe the magnetic fields that surround a current carrying conductor. Iron filings scattered in the vacinity of a current carrying wire will reveal a magnetic field perpendicular to the current flow. Magnetic field lines directed out of the page towards the [...]
Exchange Spring Magnet An exchange spring magnet is a magnetic material with high coercivity and high saturation properties derived from the exchange interaction between a hard magnetic material and a soft magnetic material, respectively. Coehoorn et al. were the first able to observe an actual exchange spring magnet.[1] Exchange spring magnets are cheaper than many [...]
Magnetic Field Characteristics After reading this section you will be able to do the following: Describe magnetic fields in different shaped magnets. Understand the important properties possessed by magnetic lines of force. Magnetic Field In and Around a Bar Magnet As discussed previously, a magnetic field is a change in energy within a volume of [...]