Lifting magnets are a type of lifting equipment used to lift and move heavy loads. There are two main types of lifting magnets: electromagnetic lifting magnet and electric permanent lifting magnet. In this blog, we will discuss the differences between these two types of lifting magnets, their advantages, and their disadvantages.
Electromagnetic Lifting Magnet
The magnetic field of the electromagnetic lifting magnet comes from an internal copper coil which is only magnetic when energized. Usually used for recycling scrap steel or lifting large pieces of steel.
Advantages:
Variable holding capacity: The holding capacity of an electromagnetic lifting magnet can be adjusted. This allows for greater flexibility in lifting a variety of loads.
Easy to control: Electromagnetic lifting magnet can be turned on and off quickly and easily. Making them ideal for applications where frequent lifting and releasing is required.
Disadvantages:
High power consumption: the electromagnetic lifting magnet must be energized at all times during operation. This results in a very high power consumption.
Low safety: the internal coils become hotter when they are energized for a long period of time, which can lead to a weakening of the magnetic force. In addition, in the event of an unexpected power failure, the steel will fall down during handling, which is a high risk.
Cannot lift thinner steel: the electromagnetic lifting magnet cannot handle thin steel plates. Because the magnetic field is so deep that the magnetic suction will penetrate the upper layer of steel plate, causing multiple layers to stick together.
Limited lift height: Electromagnetic lifting magnets have a limited lift height, which may not be suitable for certain applications.
Electric Permanent Lifting Magnet
Inside the electro permanent magnet is a rare earth permanent magnet material that uses an electric current to switch the direction of the magnetic field. This means that its magnetic field is permanent after magnetisation is complete and does not require an electric current to maintain magnetism.
Advantages:
Energy saving: As the electric permanent magnet only requires electricity at the moment of magnetisation and demagnetisation, its power consumption is only 5% of that of an electromagnet.
Safety: During the use of an electric permanent magnet lifting magnet, no steel plates will fall off due to electrical failure. Safety accidents are avoided. The electro-permanent magnet also does not get hot in long-term use.
High lifting capacity: Electric permanent lifting magnets can lift heavy loads, making them ideal for use in heavy-duty applications. Electro-permanent magnets have a magnetic suction force of up to 16 kg/cm².
Unlimited lift height: Electric permanent lifting magnets have an unlimited lift height, which makes them suitable for a wider range of applications.
Disadvantages:
The air gap between the electro-permanent magnet and the lifting object must not exceed 2 mm. Not suitable for lifting steel with large air gaps such as steel bars and scrap.
Conclusion
In summary, electromagnetic lifting magnets and electric permanent magnet lifting magnets have their own unique advantages and disadvantages. Electromagnetic lifting magnets consume more power and are not suitable for lifting steel plates. But there is no substitute for handling steel with large air gaps. Electric permanent magnet lifting magnets are more energy efficient and safe, and are suitable for most situations. When choosing a lifting magnet it is important to consider the specific application and requirements to determine which type of lifting magnet is most suitable.
HVR MAG, as a professional manufacturer of electric permanent lifting magnets, has always been committed to providing quality products and services to our customers. In addition to our regular lifting magnets. Battery powered lifting magnet also available to address the need for outdoor steel handling. Feel free to contact us.
