SGM Magnetics has been pioneering and leading the development of Electro Permanent Lifting Magnets (EPRs) since 1974, establishing itself as the global market leader in this technology.
EPR magnets offer a unique combination of permanent magnet reliability and electromagnetic control, ensuring high performance, safety, and energy efficiency in industrial lifting applications.
The functioning of Electro Permanent Lifting Magnets
Unlike standard electromagnets, which require a continuous power supply, EPR lifting magnets use a dual-magnet system composed of two types of permanent magnet blocks. During the lifting phase, these magnets align their fields to create a strong magnetic force. To release the load, a short electrical impulse reverses the polarity of one of the magnets, neutralizing the lifting force. Once activated, EPR magnets do not require power to maintain their hold, ensuring fail-safe operation and significant energy savings.
Benefits of EPRs
EPR technology offers a higher level of safety compared to traditional electromagnets. Since the lifting force relies entirely on permanent magnets, it remains independent of external power sources. In the event of a power failure or cable interruption, the load remains securely held, eliminating the need for a battery backup system.
Another major advantage of EPR magnets is their constant lifting force, which does not fluctuate based on duty cycles. Unlike electromagnets, which can experience performance variations due to heat buildup, EPRs maintain a stable lifting force, ensuring consistent operation in steel service centers, automated handling systems, and high-precision material handling applications.
Additionally, EPR magnets consume power only during activation and deactivation, reducing operational costs while offering reliable and energy-efficient lifting.
Limitations of EPRs
Due to their shallow magnetic field, EPRs perform best when there is direct contact between the magnet pole shoes and the load, making them less effective for handling materials with large air gaps.
Regarding temperature resistance, standard EPRs are suited for loads up to 250°C (480°F), while specialized models can handle temperatures up to 450°C (840°F), making them ideal for hot material applications in steel mills, rolling lines, and foundries.
