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The principle, advantages and specific steps of the method of purchasing permanent magnet products

In the magnetic material processing industry, the motor factory is located everywhere in China, but the method of purchasing permanent magnet products is not known. It is urgent to study the purchase of permanent magnet products. Magnetic products brings us some suggestions.
Permanent magnet product purchase method inspection principle
Increase the temperature of the magnet to decrease Br and Hcj. Products that do not demagnetize at room temperature tend to demagnetize at higher temperatures. Hcj and Hk determine the anti-demagnetization ability of the magnet after temperature rise. We can determine the range of magnets Hcj and Hk by measuring whether the magnet after temperature rise is demagnetized (whether the open magnetic flux drops).
The advantages of the above permanent magnet product purchase method
After the application of the motor plant works well, other magnets that work at higher temperatures (such as magnetic actuators and petroleum wax guards) are also tested using this method, and have also achieved very good results.
How to purchase permanent magnet products
1, first a number of magnets,;
2. Measure open-circuit flux, use SF-6 flux meter with Helmholtz coil;
3. Record the open magnetic flux of each magnet before heat treatment;
4. Feed the magnets into the oven. Insulation for 30 minutes (temperature distribution must be uniform, with constant temperature control), insulation temperature can be selected based on the operating temperature of the motor;
5. Measure the open magnetic flux of each magnet after heat treatment. Products that do not fall or fall are products that are non-defective. For example, after the heat treatment, the open magnetic flux drops more. This product is a nonconforming product. If you want to determine the qualified indicators, you can take a qualified product as a standard sample, this sample after the temperature treatment of open circuit flux reduction as a test basis, can be used to determine the performance of qualified samples (brake shape products Br Unable to measure, Hcj and Hk can be measured).

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