Product Description
Item: Ferrite Magnet, Motor
Ferrite Magnet
Shapes:Disc, Cylinder, Rod,
Block, Ring, Segment, Special Shape and more Customized Size is
available.
Ferrite Magnet, Motor Ferrite Magnet the third generation of
rare-earth permanent magnet, is the most powerful and advanced
commercialized permanent magnet today. It can be formed into
Various sizes and widely used in many fields such as aviation,
electronics, Instruments, meters, machines and medical
instrument.
Our Ferrite Magnets are available in a variety of shapes and sizes,
including blocks, rings, arcs, segments and disc...In order to
ensure the highest quality products, we have Founded a R&D
center and quality control center for solving the problems in
Production and quality.
We highly appreciate your any enquiry by email, by fax or by
Instant message.
We will reply your email or fax within *2 hours.
Please feel free to call us at any time if there is any
question.
Transportation.
All
available shipping ways could be applied, by courier, by air or by
sea.
Appointed shipping company or our own forwarders all could be used
in shipment.
Characteristics of Ferrite
Magnets
This section provides information of the
physical properties of Ferrite Permanent
Magnets.
Ferrite permanent magnets have good
machining properties which allows them to be cut into different
shapes and sizes - they are cut with diamond tooling; standard
drills and wire spark erosion techniques do not work (they are
electrically insulating so current does not pass through them due
to their extremely high electrical resistance, hence their other
name of Ceramic Magnets).
Ferrite magnets are made by wet or dry
pressing and sometimes by extrusion. Wet pressing gives stronger
magnetic properties (e.g. Ferrite C8). Dry pressing gives improved
dimensional tolerances (e.g. Ferrite C5). The magnets are then
sintered to fuse the powder together and are then machined to final
shape. The extrusion method can be applied to produce arc segment
shapes which are then cut to length. Sometimes new tooling is
required to produce the ferrite magnets if existing tooling does
not allow the shape to be produced. Typical tolerances for ferrite
magnets are +/*0.*5mm although +/*3% is also
used.
When Ferrite magnets get hotter, their
high intrinsic coercivity actually improves (improving resistance
to demagnetisation) making them extremely popular in motor and
generator designs and also in loudspeaker applications (only
ferrite magnets become noticeably more resistant to demagnetisation
when heated). Ferrite magnets have a positive temperature
coefficient of Intrinsic Coercivity (it changes by *0.*7 %/deg C
from ambient) and only ferrite shows this amount of this
characteristic. However the magnetic output does fall with
temperature (it has a negative temperature coefficient of Induction
of *0.2 %/degC from ambient). The end result is that Ferrite
magnets (ceramic magnets) can be used at high temperature with very
few issues.
Ferrite magnets can be used up to ***0
degrees C (and in some cases up to ***0 deg C) making it ideal for
use in electrical machines and most high temperature applications.
At sub-zero temperatures e.g. less than **0 to **0 deg C, ferrite
magnets may start to show a reduced pull force (the temperature and
the degree of weakening depends on the magnet shape and is
application specific; in most applications the temperature of
operation is not low enough for this effect to happen). This is
because if its *0.*7 %/deg C temperature coefficient of Intrinsic
Coercivity - the Hci falls as the magnet gets colder. Ferrite can
demagnetise if put in too cold an environment but it is the total
magnetic circuit design that determines how cold the magnet must be
before any weakening is noted (e.g. operating at temperatures as
low as **0 deg C is possible with careful
design).
The ferrite grades have physical
properties which are similar between the grades. Below is an
overview of these properties:-
Summary of Physical Properties of
Ferrite magnets / Ceramic magnets
|
Characteristic
|
Symbol
|
Unit
|
Value
|
|
Density
|
D
|
g/cc
|
4.9 –
5.1
|
|
Vickers
Hardness
|
Hv
|
D.P.N
|
**0 -
**0
|
|
Compression
Strength
|
C.S
|
N/mm2
|
**0 -
**0
|
|
Coefficient of
Thermal Expansion
|
C//
|
***6/°C
|
*5
|
|
|
C^
|
***6/°C
|
*0
|
|
Electrical
Resistance
|
R
|
micro
Ω.cm
|
1 x
***0
|
|
Thermal
Conductivity
|
k
|
w/cm°C
|
0.**9
|
|
Tensile
Strength
|
σUTS, or
SU
|
Pa
|
*4 x
**6
|
|
Modulus of
Elasticity
|
|
Pa
|
1.8 x
***1
|
|
Flexural
Strength
|
| Country: |
China |
| Model No: |
Yohan
|
| FOB Price: |
( Negotiable ) (Negotiable)
Get Latest Price
|
| Place of Origin: |
China |
| Price for Minimum Order: |
- |
| Minimum Order Quantity: |
100 Piece |
| Packaging Detail: |
Insulation Packing |
| Delivery Time: |
25-35 days |
| Supplying Ability: |
100000 Piece per Month |
| Payment Type: |
T/T, L/C, D/P, Western Union, Money Gram, PayPal, Other |
| Product Group : |
Magnet
|
