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Magnet manufacturer of permanent magnet material selection and application of the note

by:Newland     2020-05-08
Motor is a magnetic field as a medium for mechanical energy and electrical energy transformation of electromagnetic devices. To establishment within the motor necessary, the air-gap magnetic field of the electromechanical energy conversion, can have two kinds of methods. One is inside the motor winding is connected to electric current to generate the magnetic field, the other is a composed of permanent magnets to generate the magnetic field. Due to the intrinsic characteristics of permanent magnet, the magnet after magnetization in advance, it is no longer needed extra energy in the surrounding space magnetic field is established. This can simplify the structure of the motor, and can save energy. Permanent magnet motor of magnet manufacturers involved in permanent magnetic material is very exquisite, Ms. Joining relevant content generalization and Shared, mainly talk about the selection principles and application of permanent magnetic material process matters needing attention. 1, the principle of the selection of the permanent magnetic material magnet manufacturers various types of permanent magnetic material and the performance difference is very big, so in the design of permanent magnet motor must first choose suitable varieties of permanent magnetic material and concrete performance indicators. ( 1) Should ensure there is enough in the motor air gap air-gap magnetic field and the regulation of motor performance metrics. ( 2) In the regulation of environmental conditions, working temperature and use conditions should be able to guarantee the stability of the magnetic. ( 3) Have good mechanical properties, to facilitate the processing and assembly. ( 4) Economy is better, the price is suitable. 2, permanent magnetic material application considerations ( 1) Magnet manufacturer of permanent magnetic material actual magnetic associated with specific manufacturing factory, its value and the standard of data tend to have a certain deviation between. The same type of permanent magnetic material, different factory or same factory there are certain magnetic differences between different batches. For the actual shape and size of the permanent magnet motor, the magnetic and also can exist certain differences between the standard data. In addition, the capacity of the charger magnetization methods will affect the size and uniformity of permanent magnet magnetization state, can affect the magnetic. Therefore, in order to improve the accuracy of motor design and calculation, need to ask the manufacturer for the batch number of the actual size of permanent magnet under room temperature and working temperature of the measured demagnetization curve, can best when conditional sampling directly measure the demagnetization curve, more reliable. For the high consistency requirements of motor, need more to the permanent magnet material one by one piece for testing. ( 2) Magnet manufacturer of permanent magnet magnetic besides associated with alloy composition and manufacturing process, is also related to the magnetic field heat treatment process. The so-called magnetic heat treatment, is permanent magnet materials applied in the process of decomposition reaction with magnetic field. After magnetic field heat treatment, permanent magnet magnetic can improve, but with a directional, the largest in the magnetic field direction, minimum vertical magnetic field direction, this is called anisotropy. For heat treatment without magnetic field of permanent magnet material, magnetic can not directional, known as isotropic. It should be noted that for anisotropic permanent magnet, the magnetization of the magnetic field direction should be consistent with magnetic field heat treatment at the time of the magnetic field direction, otherwise can magnetism will be reduced. ( 3) Magnet manufacturer of permanent magnet material from room temperature to the highest working temperature and heat preservation time and then cooled to room temperature, the open-circuit magnetic flux is not more than 5% of the irreversible loss are allowed. So in order to guarantee the stability of permanent magnet motor in the process of running performance, not obvious irreversible demagnetization, before use should be steady magnetic processing, the method is the magnetization of permanent magnetic material will heat up to the highest working temperature and heat preservation is expected to 2 to 4 hours, in order to eliminate this part of the irreversible losses in advance.
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