Page 77 - 《橡塑技术与装备》英文版2026年1月

TEST AND ANALYSIS

Application of variable frequency drive permanent magnet synchronous
motor in plastic extruder

Xu Zhisheng
(Dalian Sunlight Technology Co. LTD., Dalian 116024, Liaoning, China)
Abstract: This article primarily focuses on the transmission system of plastic extruders, utilizing frequency
converters to drive permanent magnet synchronous motors. It elaborates on the advantages of permanent
magnet synchronous motors over conventional three-phase asynchronous motors, including high efficiency,
high power factor, large starting torque, high precision, wide speed range, simple structure, and small size.
Additionally, through parameter optimization and adjustment of the Toshiba frequency converter VF-AS3, the
operational efficiency of the permanent magnet synchronous motor is enhanced, thereby assisting customers
in reducing costs, conserving energy, and ensuring smooth operation of the extruder.
Key words: extruder; permanent magnet synchronous motor; frequency converter; energy saving
Classification number: TQ320.663 Article number: 1009-797X(2026)01-0031-05
Document code: B DOI:10.13520/j.cnki.rpte.2026.01.010

0 Introduction 1.1 Requirements of plastic extruder for
In plastic extrusion molding equipment, the plastic drive motor
extruder is commonly referred to as the host machine, while As shown in Figure 1, a plastic extruder is a material
the subsequent equipment, the plastic extrusion molding processing equipment that relies on the pressure and shear
machine, is known as the auxiliary machine. The driving part force generated by the rotation of the screw to enable the
of the plastic extruder typically consists of an electric motor, material to be fully plasticized and evenly mixed, and then
a reducer, and bearings (see Figure 1). In the past, electric extruded through the die head mold. Extruders can be basically
motors were mainly DC-regulated. With the continuous divided into two categories: single-screw extruders and twin-
development of AC technology, AC frequency converters screw extruders. These two types of extruders have basically
have replaced DC regulation, saving a significant amount of the same requirements for the driving motor, which are
energy for the country. However, this is far from enough. With generally as follows:
the introduction of new national standards, aiming to achieve （1）The starting torque is large. The working
carbon peak by 2025 and carbon neutrality by 2050, reducing characteristics of the extruder determine that the motor must be
energy consumption has become an important indicator. capable of heavy-load starting, and the low-frequency output
Statistics show that 65% of the electric energy is actually used torque of the frequency converter should be powerful and have
in motors. Given the high power of plastic extruder motors high overload capacity.
and customers' high requirements for motor efficiency, it is （2）The debugging performance is good. The extruder
necessary for us to have better choices for extruder motors.

Biography: Xu Zhisheng (1975-), male, holds a bachelor's degree
1 Drive system of plastic extruder and is a senior electrical engineer, primarily engaged in research on
industrial automation.

Vol.52，2026 ·31·