Arc Segment Ferrite Magnet for generator

Arc Segment Ferrite Magnet for generator

Ferrite magnets have good anti-corrosion performance, no surface treatment needed. There are two manufacturing process for ferrite magnets: dry process and wet process. By dry process, can produce isotropic & anisotropic magnets; by wet process, only anisotropic magnets can be produced.

Isotropic ferrite magnets are not oriented and can be magnetized in any direction; anisotropic ferrite magnets are different, they are all oriented in the manufacturing direction, and should be magnetized in the direction of orientation. For dry process, the tool can be changed and developed easily, while for wet process, it is complicated to change the tool and the tooling charge is much higher. At present, we have put our emphasis on arc segment magnets for electric motors, disc magnets and block magnets for special applications.

Ferrite magnets main features：

High coercivity (= high resistance of the magnet to demagnetization).

Highly stability under difficult environment conditions with no need for a coating to protect the magnet.

High resistance to oxidation.

Durability - the magnet is stable and constant.

Advantages:

1. Because they are ceramic, Ferrite magnets have a tendecy to break or ship and require careful handling during assembly.

2. The magnetic flux temperature coefficient is -0.18%C,much larger than for rare earth magnets or alnico magnets,so temperature stability must be taken into account.

3. Coercive fore decrease at rate of 0.5%C when the temperature decreases, and problems may occur due to low temperature demagnetization. It is vital that the magnets operating point be higher than the knee point on its demagnetization curve.

4. Low cost, No surface treatments.

Hard Ferrite Arc Magnet For Motor

Arc magnets are a unique shape which are designed especially for motors, generators and alternators and are commonly used for both rotors and stators. Ferrite arc magnets are also used in magnetic flywheel assemblies. In motor design a ring of magnets with alternating polarities on the inner radius rotate in close proximity to a number of copper coils. As the copper passes through the magnetic fields an electric current is induced within the copper.

Four or more magnets with an equal number of north and south polarity on the inner radius can be used to create a multi-pole ring magnet. All ferrite arc magnets are available with either pole on the inner radius.