News
05
2019
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11
The performance of permanent magnet motors is better than that of induction motors
Permanent magnet synchronous motors have been used in machine tools and other production machinery for many years due to their reliable performance, durability, relatively low cost and electrical stability. These motors have been a standard configuration in the machine tool industry for decades and can be used for spindle, table rotation, mode and part articulation, whether in rotary or linear motion, are controlled motion. With the emergence of machine tool robots for material handling, workpiece and tooling replacement, high-precision loading and unloading functions, and more functions, the use of motors has increased exponentially over the years. Behind the cutting chamber, they can also be found on chip conveyor, hydraulic manifold, oil reservoir and coolant pump. Similarly, in the field of production machines, plastic and rubber forming and extrusion, papermaking, packaging, textiles, ceramics, glass, woodworking and countless other equipment use these motors for motion control.
In addition, the basic working principle of permanent magnets in the rotor assembly is to generate a stable magnetic field instead of the short-circuit current found in asynchronous induction motor design, which brings many advantages to mechanical designers, manufacturers and the aftermarket. These advantages include a compact form with high torque density and less weight; higher continuous torque in a larger speed range, lower rotor inertia, higher dynamic performance under load; higher operating efficiency without excitation current, and correspondingly no heat due to current Compared with DC motors, the torque ripple effect in the rotor is smaller and the performance is more stable, the cos phi (power factor) is good and ultimately improves drive utilization.
Permanent magnet motors provide a variety of design integration options and have advanced performance features to achieve higher energy efficiency in today's machines, greatly reducing components and greatly reducing footprint. The challenge, of course, is the rising cost of raw materials due to certain economic factors in the world market, although the discovery of rare earth magnets (REM) may greatly affect this situation in the future. In addition, manufacturers are constantly solving more technical problems, such as the limited speed range in field applications and degradation due to the back voltage generated by the magnet.
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