Page 80 - 《橡塑技术与装备》英文版2026年1月

HINA R&P TECHNOLOGY AND EQUIPMENT

synchronous motors come standard with imported brand primarily discusses the adjustment and parameter setting of
bearings across the entire range. For frame sizes 80~160, Toshiba frequency converters for PM synchronous motors.
sealed deep groove ball bearings are standard; for frame sizes 3.2 Main parameters of frequency converter
180~355, either lubricable deep groove ball bearings or angular In addition to the parameters on the motor nameplate,
contact ball bearings are standard, with the option to install the following introduces several important parameters for
sealed bearings. To enhance the cantilever force at the drive Toshiba's variable frequency control of permanent magnet
end, cylindrical bearings can be equipped at the shaft extension synchronous motors:
end for frame sizes 160~355. （1）Open-loop control selects V/F mode: 6, for the
（3）Motor size specification selection: The frame control of PM motors;
size can be reduced (by 1 to 3 frame sizes for different （2）Automatic tuning selection: 2, automatic tuning
specifications), which not only improves efficiency but also upon initiation of command (after execution, it becomes 0);
meets customer requirements regarding motor volume and （3） Current response: 25. To prevent current fluctuations,
weight. The standard frame size (consistent with asynchronous the current response should be set below 25;
motor dimensions) allows for equipment and energy efficiency （4）Speed control response: 2. In the case of PM motors,
upgrades for customers with minimal modification to other they are more prone to vibration compared to induction motors,
supporting equipment. so the setting value should be smaller;
Therefore, this article adopts the Honeywell permanent （5）PM out-of-step detection frequency: 20%,
magnet synchronous motor. determination of reversal, stop operation when exceeding 20%
of the fundamental frequency;
3 Selection and main parameters of （6）PM out-of-step detection current level: 75%, set at
frequency converter the variable frequency rated current ratio %, with 75% as the
3.1 Selection of frequency converter threshold;
As introduced in the introduction, the application of AC （7）PM out-of-step detection time: 0.07 s, out-of-step
frequency converters in extruders has become mainstream, and reversal determination condition, 7 ms trip operation stop;
the control and principles of frequency converters will not be （8）PM control mode selection: 3, for good decreasing
discussed in this article. However, there are numerous domestic torque control application. Both IPM and SPM motors without
and foreign brands of frequency converters used in extruders. saliency can be applied, sometimes with reverse rotation.
To choose a frequency converter suitable for permanent magnet
synchronous motors, we mainly consider three points: ① high c 4 Permanent magnet synchronous motor
ost-effectiveness; ② high performance and rich parameters; ③ standards and energy conservation
simple debugging and convenient operation. Through comparative 4.1 Permanent magnet synchronous motor
experiments of different brands, Toshiba frequency converters standards
have an absolute advantage. Therefore, this article adopts the In 2020, China raised its motor energy efficiency
Toshiba frequency converter VF-AS3 series. standards, and now the national standards are fully aligned with
The VF-AS3 Toshiba frequency converter boasts international standards. The highest level of energy efficiency
excellent control capabilities for permanent magnet (PM) in the national standards, Level 1, is equivalent to IE5 in the
synchronous motors, featuring a built-in DC reactor and international standards, and so on, as shown in Figure 5. The
filter. Additionally, it supports high-speed/real-time network Honeywell permanent magnet synchronous motor selected in
communication via embedded Ethernet, eliminating the need this article is of IE5 standard, Level 1 energy efficiency, which
for any additional equipment and meeting the automation is currently the highest level.
requirements of modern IoT and Industry 4.0. This facilitates 4.2 Energy conservation
future remote and networked management. This article Dalian Sanlei Technology Co., Ltd. has begun using the

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