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Permanent holding magnets


A permanent magnet is a magnet that can generate a constant magnetic field without depending on an external energy source.

How does the permanent magnet work?

By applying current to the coil, the permanent magnetic field of the magnet is neutralised and can be released from the armature plate. As soon as the current is switched off, the magnet adheres to the armature plate again.

Since a certain amount of power is required to neutralise the permanent magnetic field, it is important that no permanent current is applied. I.e. the voltage should be switched off again after the magnet has been released. In this way, a long service life of the holding solenoid can be achieved.


A permanent holding magnet can generate and maintain a magnetic field without the need for an external power source. Some key characteristics of permanent magnets are:

Magnetisation: a permanent magnet has a permanent magnetisation and does not require a current for their magnetic field.

Important: In practice, the life of permanent magnets is not unlimited. Magnets lose their magnetic properties, but this can last up to hundreds of years, depending on the application and external environmental influences.

Remanence: The remanence or the magnetic residual force of the
magnet is the maximum magnetisation that the magnet retains after the magnetic
magnet retains after the magnetic source has been removed.

Magnetic field strength: The strength of a permanent magnet depends on the
material used, but also on the accuracy with which the magnetisation of the material is carried out.

Magnetic field direction: The direction of the magnetic field of the permanent magnet depends on its geometry and is aligned along the axis of the magnet.

Corrosion resistance: Some materials from which permanent magnets are made are corrosion resistant, making them ideal for applications in harsh environments.

Temperature dependency: The magnetisation of permanent magnets
can be affected by changes in temperature. Some materials retain their magnetisation better at high temperatures than others.

Magnetisation direction: A permanent magnet can be magnetised in a certain direction, which makes it produce a stronger magnetic field in a certain direction.

Holding force: The larger the permanent magnet, the greater its holding force.

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Example: Drawing Permanent Holding Magnet

  • Where are permanent magnets used?

    Permanent magnets are used in many areas, including:

    Electronics: permanent magnets are used in speakers, microphones,  headphones, hard drives and various sensors.

    Medical technology: In medical technology, permanent magnets are used for  imaging procedures such as magnetic resonance tomography (MRT) and  Magnetocardiography (MKG) are used.

    Transportation: Permanent magnets are used in electric motors for 
    vehicles and trains and in wind turbines.

    Power generation: In power generation, permanent magnets are used are used for generators and motors to produce electrical energy.

    Mechanics: Permanent magnets are also used in mechanical  applications such as magnetic couplings, magnetic bearings and magnetic valves.  magnetic valves.

    Automotive industry: Permanent magnets are used in the  in electric motors for hybrid and electric vehicles as well as in numerous  electric vehicles as well as in numerous sensors and actuators.

    Electrical engineering: In electrical engineering, permanent magnets are used for current  meters, solenoid valves and in switches.

    Household appliances: Permanent magnets are used in household appliances such as 
    such as refrigerators, dishwashers and washing machines.

    Overall, there are many different applications for  permanent magnets due to their high magnetic force, their energy  energy efficiency and their permanent magnetisation

  • What is the difference between a holding solenoid and a permanent holding solenoid?

    A holding magnet and a permanent holding magnet differ in their magnetic properties and in their ability to maintain a magnetic field.

    A holding magnet is a magnet that is only magnetic when it is near another magnet. It sticks to a metallic surface because it is attracted to another magnet. If the other magnet is removed, the holding magnet loses its magnetic force.

    A permanent holding magnet, on the other hand, retains its magnetic force even if it is removed from another magnet. This means that the permanent holding magnet can maintain a magnetic field without having to be attracted by another magnet.

    Because of this principle, permanent holding solenoids are preferably used where long holding times are required and the unit is only switched on for a short time.

    Furthermore, their use is as a safety magnet in transport equipment, as a load is reliably held even in the event of a power failure.