Permanent Lifting Magnets

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Permanent Lifting Magnets
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Synopsis

• Permanent Lifting Magnets - Types
• Permanent Lifting Magnets vs. Electromagnets
• Permanent Rotary Magnetic Chucks In a Nut Shell

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Permanent Lifting Magnets - Types

• Ceramic Magnets
• These are made through sintering and pressing
  method. They basically consist of iron oxide and
  barium. If you are looking for a functional low
  cost lifting magnet, this could be a great choice
  for you. The affordability of ceramic magnets is
  probably one of the factors making it the most
  widely used lifting magnet today.
• Samarium Cobalt Magnets
• Unlike the ceramic magnets, samarium cobalt
  magnets are generally very expensive. Some
  factories however, especially those dealing with
  items that require high resistance to temperature
  and corrosion, have to use this type of magnets.
  Samarium cobalt magnets are made from rare earth
  metals and as such have very high magnetic
  strength. This type of permanent lifting magnet
  has excellent resistance to temperature.
• Neodymium Iron Boron Magnets
• These too are made from rare earth metals and
  have very high magnetic strength. Unlike the
  samarium cobalt however, Neodymium iron boron
  magnets are easily oxidized and their resistance
  to temperature is also much lower. These magnets
  have lower manufacturing costs and they can be
  molded into compact designs

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Permanent Lifting Magnets - Types

• Injection Molded Magnets
• These magnets are made of resin and magnetic
  powder through the process of injection molding.
  For factories desiring complex designed magnets,
  this might be the best option they will get. They
  are however low energy meaning that their
  magnetic strength is considerably lower than
  other types of permanent lifting magnets.
• Alnico Magnets
• These magnets are made of nickel, cobalt and
  aluminum. Small portions of other elements are
  also incorporated in the making of these magnets.
  They are produced by sintering and casting where
  castings ensure that they have superior energy
  and sintering gives them excellent mechanical
  characteristics. These magnets can easily be
  demagnetized but they have pretty strong
  resistance to demagnetization as a result of
  shock.
• Flexible Magnets
• As the name suggests, these magnets are very
  flexible but this depends on the material used in
  producing them. Their production is very similar
  to that of injection molded magnets except that
  these are made into flat strips and sometimes
  sheets. They have very low magnetic strength and
  therefore ensure to read the manufacturers
  manual to know exactly which type of loads can be
  lifted using these magnets.

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Permanent Lifting Magnets vs. Electromagnets

• Advantages of permanent lifting magnets over
  electromagnets
• The major advantage of permanent lifting magnets
  is the fact that they do not require electric
  power to make them magnetic and therefore they
  can operate just fine in areas where electric
  power is not available or when power fails. This
  makes permanent lifting magnets relatively
  cheaper than equivalent electromagnet as they
  have minimum if any maintenance cost.
• Another advantage is that they are usually
  designed with wide or long surfaces and as such
  provide a wider area for magnetic coverage. This
  coupled with its constant magnetic strength makes
  permanent magnets perfected for lifting materials
  of varied sizes and shapes.
• Where work parts have to be lifted very high,
  permanent magnets have superior functionality
  than electromagnets as they are far much lighter
  than the later. This characteristic also makes
  them far much safer than electromagnets in such
  scenarios as the risk of them dropping the item
  is minimized.
• Electrical contact in electromagnets may cause
  problems that eventually deteriorate the magnets.
  This is not the case with permanent lifting
  magnets. These magnets also do not cause damages
  to test pieces as seen in electromagnets.

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Permanent Lifting Magnets vs. Electromagnets

• Disadvantages of Permanent lifting magnets
• These magnets are very durable but they are
  disadvantaged in that they deteriorate with wear.
  When this happen, they will lose their magnetism
  and thus become a danger to work with. This will
  necessitate replacement which a costly process.
  The fact that permanent magnets retain their
  magnetism could be a pro as well as a con. Its
  downside is witnessed when the target load has
  been lifted and magnet has to be literally pulled
  off the item. In electromagnet, this tedious
  process is not necessary as all you simply need
  to do is to turn the switch off and once the
  current stops flowing in the insulated wire coil,
  it loses its magnetism and the item is
  immediately released.
• Another major disadvantages of permanent lifting
  magnet compared to electromagnet is the fact that
  you have absolutely no control over field
  strength. Changing magnetic field to suit the
  item that you want to work on is however possible
  in electromagnets. This is done by simply
  controlling the current that flows through the
  coil of wire rapped across the core of the
  ferromagnetic material.
• Permanent magnets are sensitive to air spaces and
  they function better where there are no air
  spaces between it and the item being lifted.
  However, these magnets tend to attract unwanted
  ferromagnetic metals and other materialist the
  poles and therefore creates spaces that may
  reduce lifting capacity of the magnet. These
  items have to be pulled out for the magnet to
  lift a load and this is tedious.

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Permanent Rotary Magnetic Chucks In a Nut Shell

• Distinguishing Electromagnetic from Permanent
  Magnetic Chucks
• Permanent rotary magnetic chuck is different from
  an electromagnetic chuck in a number of ways but
  both are generally very powerful if used in the
  appropriate application. While electromagnet
  chucks attach and detach work pieces by simply
  switch on and off the current, a permanent rotary
  magnetic chuck has a more permanent hold on the
  work piece and once it is attached, you will be
  required to pull it off in case you want to
  detach it. It is also possible to adjust the
  holding power in electromagnetic chucks by simply
  controlling the current flowing through the wire
  coil, but in a permanent rotary magnetic chuck,
  this cannot be done. Unlike the permanent
  magnetic chucks, the electromagnetic chucks have
  an interlocking property that makes them very
  easy to operate.

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Permanent Rotary Magnetic Chucks In a Nut Shell

• Types of Permanent Magnetic Chucks
• Increased competition in the magnets
  manufacturing industry coupled with varying
  customer demands and technological advancement, a
  variety of permanent rotary magnetic chucks can
  be found in the market today. Depending on the
  application that you want to use the magnetic
  chucks on, you can be sure to get one that will
  just be right for you. Some manufacturers even go
  the extra mile of custom making the magnetic
  chuck for you in an event that you want
  additional or special features added to it.

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  anent-lift-magnets-neo-series.htm