How long will magnetic steel produce demagnetization after use and what is the reason for demagnetization?
It can be used for 30 to 50 years if not exceeding a given temperature. It can be estimated that the magnetic loss for using 30 years is less than 1%, about 1.3% for 50years and 2% for 150 years according to a test lasted for 12 years; common causes for magnetic changes include temperature, time, electromagnetic field, radiation, mechanical vibration, impact, etc.
Analysis of the theoretical and actual temperature resistance performance of magnetic steel
The theoretical temperature resistance performance of magnetic steel refers to the temperature resistance property of the material, while actual temperature resistance performance generally refers to the temperature resistance property after installing a certain specification of magnetic steel to the motor. The actual temperature resistance performance is affected by many factors, such as customers' specification, thickness, assembly method (embedded, surface-mount ), etc.
Magnetic steel coating.
Surface protection can be divided into two categories: wet and dry.
The wet process is applying surface protection treatment with the presence of pure water, inorganic solution or organic solution, such as electroplating, chemical plating, electrophoresis, spraying and dipping.
The dry method is applying surface protection treatment by physical or chemical processes, keeping magnet not in contact with the solution, such as physical vapor deposition (PVD) and chemical vapor deposition (CVD). Where, physical vapor deposition (PVD) includes vacuum evaporation plating, vacuum sputter plating and ion vapor deposition (IVD). Different coating methods have their own advantages. We shall choose a proper one according to different application environment requirements.
Does the slight angle deficiency at magnet edge affect the performance and superficial magnetic field of magnet?
No impact in a small range when calculating according to the area of the product. Negotiate with customers for details.