Produce the Sintered NdFeB magnets powder metallurgy process

Manufacturing process employed to produce the Sintered NdFeB magnets powder metallurgy process, which will contain a certain proportion of raw materials such as: neodymium, dysprosium, iron, cobalt, niobium, praseodymium, aluminum, Sintered NdFeB magnets boron and iron through the medium frequency induction melting furnace smelted into gold ingots and then crushed a powder made of 3 ~ 5μm, and compression molding in a magnetic field, Sintered NdFeB magnets after forming the green compact in a vacuum sintering furnace and sintering temper aging, so get a certain permanent magnet magnetic blank. After rough grinding, Sintered NdFeB magnets drilling, slicing and other machining processes, and then by surface treatment required by the user to get Sintered NdFeB magnets products.

Motor with a Sintered NdFeB magnets in the work process is the gap length and volume changes for the dynamic magnetic circuit. Sintered NdFeB magnets not only by temperature changes, but also by its reverse armature emf demagnetization effects. Since the operating point is in response to online and from changes in circulation makes the magnet demagnetization state.

This requires us to do motor circuit design, Sintered NdFeB magnets not only to consider the effects of temperature variations, but also take into account the additional effects of dynamic demagnetization. General power type DC motor, Sintered NdFeB magnets the armature effects, which are the minimum operating point at approximately -0.6 place, Sintered NdFeB magnets which requires continuous operation of the motor magnet temperature of the BH curve remains linear, if the BH curve is bent, the Sintered NdFeB magnets will demagnetization due to armature produces permanent effect; addition to the limit of the magnet in the motor temperature, requiring the irreversible flux loss hirr ≤ 5%.