Characteristics application of SmCo permanent magnet
magnet has high magnetic energy product andhigh cercive force.
Its properties are better than AlNiCo,ferrite permanent magnet.
Its max. energy product is up to 239kJ/m3(30MGOe), which is
three times of that of AlNiCo8 permanent magnet, eight times
of that of ferrite permanent magnet (Y40). So the permanent
magnetic component made from SmCo material is small, light
and stable in property. It is widely applied to electro acoustic&
telecommunication apparatus, electric motors, measure meters,
peg-top,electronic watch,microwave apparatus, magnetic mechanism,
sensor and other static or dynamic magnetic routes.
temp. of the SmCopermanent magnet is high and its temp. Coeff.is
low. So it is suitable for use at 300, high temp.
magnet is hear and bristle. Its rigidity strength, tensile
strength and press strength are low. So it is not suitable
ingredient of SmCo permanent magnet is metal cobalt(CoY99.95%).
So its price is high.
points for application design of permanent magnet
stated herein are typical grades of SmCo permanent magnet
only. We could meet your requirements for various magnetic
of permanent magnet at high temp., you need consider the following
two important parameters: recoil temp. coeff()
and intrinsic coercive force(Hcj). Recoil temp. coeff. is
a parameter to measure the performance of the permanent magnet
with the variation of the temp. When the temp come back to
the initial value, the magnetic properties of the permanent
magnet will reversibly return to the initial condition too.
More smaller the temperature coefficient is, more lower the
magnetic properties are. In the meantime, with the variation
of the temperature, the magnetic properties of permanent magnet
can change irreversibly. This is called irreversible loss.
The irreversible loss descends with the increase of the intrinsic
dimensions of he permanent magnet should be taken into account
for the application design. Generally speaking, the demagnetization
curve of SmCo permanent magnet is close to a straight line
and the difference value between Residual Flux Density Br
& coercive force Hcb is relatively small. So we should
choose the working point (Pc value) around the Max. energy
product, i.e. (BH)max. Thus we could utilize the magnetic
energy fully and save the cost greatly. Design reference:
magnet is a functional material. It is unsuitable for structure
part design. So the usual requirement to the tolerance of
the dimensions for structure part is not applicable to it.
For the detailed tolerance design, please refer to "permanent
magnet supply illustration".
magnet has strong anticorruption function. So it needn't similar
surface treatment as that of NdFeB magnet. For the surface
protect of SmCo permanent magnet, please turn to "surface
protect and protect coating of permanent magnet". The
coating will add to the cost in turn.