Why Permanent Magnet (Servo) Motors Are Not Suitable for Electric Spiral Presses

Temperature Sensitivity:

Permanent magnet motors are highly sensitive to temperature fluctuations. The high-temperature environment in forging operations can cause a degradation of the magnetic properties of the permanent magnets, potentially leading to demagnetization. This reduction in magnetic performance negatively impacts motor efficiency, output power, and lifespan.

Design Limitations:

The design flexibility of permanent magnet motors is limited, as it is necessary to consider factors such as magnet arrangement and size. This restriction hampers their suitability for forging applications that involve high loads and shock conditions, which are typical in electric spiral presses.

Magnetic Field Degradation:

Over time, permanent magnets may experience magnetic field degradation. Although modern technologies can slow down this process, it cannot be completely prevented, leading to a gradual reduction in motor performance.

Lack of Adjustability:

Compared to switched reluctance motors, permanent magnet motors have limited adaptability under dynamic loads. They lack real-time adjustment capabilities, which makes them less suitable for applications like electric spiral presses, where the load changes frequently.