Page 78 - 《橡塑技术与装备》英文版2026年1月

HINA R&P TECHNOLOGY AND EQUIPMENT

needs to discharge material evenly and adapt to products of current variable frequency speed regulation scheme using three-
different specifications, which requires high speed regulation phase asynchronous motors with a combination of a frequency
accuracy and a wide range to meet the speed regulation converter and a permanent magnet synchronous motor. This not
requirements under various working conditions. only improves the performance of the extruder, but also saves
（3）The characteristic curve should be stiff. It is a significant amount of electricity for customers, as permanent
necessary to ensure that the extruder speed remains basically magnet synchronous motors are more energy-efficient than the
unaffected by load changes, so as not to affect efficiency. commonly used three-phase asynchronous motors.
（4）Easy to install and operate. From a design
perspective, considering the high power of the extruder motor,
the smaller the motor size, the better. This necessitates easy
installation, simple operation, and flexible control.

Figure 2 Block diagram of variable frequency drive
permanent magnet synchronous motor

2 Introduction to permanent magnet

Figure 1 Assembly drawing of extruder synchronous motors and motor selection
2.1 Structure of permanent magnet synchronous
1.2 Composition of drive system motor
In response to the requirements of extruders for drive The basic structural composition of a permanent magnet
performance and the new national standards for reducing energy synchronous motor is shown in Figure 3.
consumption, as shown in Figure 2, we propose to replace the

Figure 3 Composition of permanent magnet synchronous motor

As can be seen from Figure 3, the stator, bearing, frame, known as the "Magnetic King";
and other parts of a permanent magnet synchronous motor are （2）It has very high anti-demagnetization ability;
basically the same as those of a variable frequency motor, but （3）It can be processed into various shapes;
its rotor is composed of magnetic steel, replacing the silicon （4）It is a kind of anisotropic material;
steel sheets of ordinary motors. （5）Devices utilizing neodymium iron boron exhibit
The material of magnetic steel is permanent magnetic excellent energy-saving effects;
material (magnetite), and currently, sintered neodymium-iron- （6）Devices utilizing neodymium-iron-boron can
boron permanent magnetic material is mainly used. It has the achieve miniaturization.
following characteristics: 2.2 Advantages of permanent magnet
（1）It boasts extremely high magnetic properties and is synchronous motors

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