Page 81 - 《橡塑技术与装备》英文版2026年1月

TEST AND ANALYSIS

drive solution of Toshiba inverter + Honeywell permanent
magnet synchronous motor on the SJ-120×38/SJ-90×38 single
screw extruder. By testing the same power 315 kW Honeywell
permanent magnet synchronous motor (IE5) and three-
phase asynchronous inverter motor (IE3), a curve diagram
of efficiency, power factor, and load for permanent magnet
synchronous motor and asynchronous motor was drawn (see
Figure 6). The specific analysis data is shown in table 1.
Figure 5 International and domestic standards for motor
energy efficiency

Figure 6 Curve diagram of permanent magnet synchronous motor and asynchronous motor
Table 1 Comparison between permanent magnet synchronous motor and asynchronous motor（1）
Motor category Economic operation zone Efficiency has decreased a bit Power factor at 25% load
Asynchronous motor 60%~100% 35% Decreased from 0.85 to around 0.5
Permanent magnet synchronous motor 25%~120% 15% Above 0.9

From Table 1, we can see that in actual economic with both generally exceeding 90%.
operations, permanent magnet synchronous motors exhibit Meanwhile, we monitor energy consumption, and the
significant advantages in terms of efficiency and power factor, energy-saving effect is very significant, as shown in Table 2.

Table 2 Comparison between permanent magnet synchronous motor and asynchronous motor（2）
Equipment power IE5 energy efficiency IE3 energy efficiency quantity Energy saving per hour/kW at 50% to 80% load
315 kW 97.2% 94.6% 1 18

As shown in Table 2, under the condition that the actual magnet synchronous motors in extruders has significant
operating torque is 50% to 80% of the rated torque (the torque advantages in improving the performance of extruders,
of a typical extruder), the annual calculation is approximately compared to current extruder drive schemes. Especially after
18 × 8,760 = 157,680 kW.h. The estimated actual cost savings the country set the goals of carbon peak and carbon neutrality,
can reach up to 150,000 yuan per year, and the cost of the the use of permanent magnet synchronous motors in plastic
motor can be recovered after approximately half a year of extruders is very necessary. Currently, based on customer
continuous operation. feedback from on-site usage, customers are very satisfied and
the equipment is operating well.
5 Conclusion
The application of variable frequency drive permanent

Vol.52，2026 ·35·