At present, the functions of the products of major inverter brand manufacturers mostly cover the functions required by industrial machinery, such as the swing frequency control of spinning. However, due to the unsatisfactory dynamic performance of VF or space voltage vector control technology, the proportional linkage problem of dyeing and finishing machinery cannot be used smoothly. The main problem is the lack of performance such as speed accuracy, low-speed torque, acceleration and deceleration time, and frequency resolution.
Compared with inverters using traditional domestic frequency conversion control or space vector control technology, vector control inverters have the following advantages:
1. Low-speed torque is large, and low-speed torque is required in many occasions, such as sizing machines. Speed sensorless vector control just meets this demand.
2. The acceleration and deceleration speed is fast, and there are some spinning frames, twisting machines, etc. The frequency swing function of the frequency converter is required. However, under the traditional process, the response of the drive motor is slow, and the yarn quality is not ideal. Puchuan Technology PI-7800G general-purpose adopts speed sensorless vector control technology and has motor parameter self-adaptive function. Due to the use of frequency converters in the forming mechanism to remove the forming cams, the peach bottom stop and peach top impact caused by the forming cams are further overcome. Thus, the shape of the spun loop is improved. In order to facilitate the high-speed unwinding of the next process. At the same time, the frequency converter is used to control the spindle speed, so that the spinning speed changes when the yarn is large, medium and small, thereby reducing the yarn breakage rate. Can react quickly, so the effect is better.
3. Fast acceleration, in the pump drive system of the low temperature dyeing machine, it needs to start quickly to ensure the temperature and pressure of the machine. The PI-7800F inverter of Puchuan Technology adopts the sensorless vector control technology, which can guarantee the start-up in a very short time, and the energy-saving space is quite ideal. At the same time, circular looms also need to start quickly and stop at an appropriate time, which is related to mechanical inertia, broken needles, etc. Speed sensorless vector control technology can meet its needs.
4. The ratio linkage effect is good. Due to the automatic parameter adjustment function, when the load and voltage change, the output speed of each unit can be kept constant, so it is very suitable for proportional linkage control. At the same time, it can be controlled through the RS-485 communication interface, which can improve the speed regulation accuracy and reduce wiring. .
5. PID function, generally the inverter itself has PID control function, so it can meet the needs of various closed-loop control.
6. A variety of analog input ports Universal G series inverters have two analog input ports and one digital input port, both of which can choose the PID function, and are specially used for the drive of multi-channel signal input control such as proportional linkage and winding machine.
7. It can protect the motor, start smoothly, eliminate mechanical shock, protect mechanical equipment and reduce motor maintenance costs.
Continuously improving the mechatronics level of textile machinery can better apply AC frequency conversion technology to the control of textile machinery. Vector frequency converters and general-purpose frequency converters can already meet 70% to 80% of the requirements of the textile industry for frequency converters.
At present, the functions of the products of major inverter brand manufacturers mostly cover the functions required by industrial machinery, such as the swing frequency control of spinning. However, due to the unsatisfactory dynamic performance of VF or space voltage vector control technology, the proportional linkage problem of dyeing and finishing machinery cannot be used smoothly. The main problem is the lack of performance such as speed accuracy, low-speed torque, acceleration and deceleration time, and frequency resolution.
Compared with inverters using traditional domestic frequency conversion control or space vector control technology, vector control inverters have the following advantages:
1. Low-speed torque is large, and low-speed torque is required in many occasions, such as sizing machines. Speed sensorless vector control just meets this demand.
2. The acceleration and deceleration speed is fast, and there are some spinning frames, twisting machines, etc. The frequency swing function of the frequency converter is required. However, under the traditional process, the response of the drive motor is slow, and the yarn quality is not ideal. Puchuan Technology PI-7800G general-purpose adopts speed sensorless vector control technology and has motor parameter self-adaptive function. Due to the use of frequency converters in the forming mechanism to remove the forming cams, the peach bottom stop and peach top impact caused by the forming cams are further overcome. Thus, the shape of the spun loop is improved. In order to facilitate the high-speed unwinding of the next process. At the same time, the frequency converter is used to control the spindle speed, so that the spinning speed changes when the yarn is large, medium and small, thereby reducing the yarn breakage rate. Can react quickly, so the effect is better.
3. Fast acceleration, in the pump drive system of the low temperature dyeing machine, it needs to start quickly to ensure the temperature and pressure of the machine. The PI-7800F inverter of Puchuan Technology adopts the sensorless vector control technology, which can guarantee the start-up in a very short time, and the energy-saving space is quite ideal. At the same time, circular looms also need to start quickly and stop at an appropriate time, which is related to mechanical inertia, broken needles, etc. Speed sensorless vector control technology can meet its needs.
4. The ratio linkage effect is good. Due to the automatic parameter adjustment function, when the load and voltage change, the output speed of each unit can be kept constant, so it is very suitable for proportional linkage control. At the same time, it can be controlled through the RS-485 communication interface, which can improve the speed regulation accuracy and reduce wiring. .
5. PID function, generally the inverter itself has PID control function, so it can meet the needs of various closed-loop control.
6. A variety of analog input ports Universal G series inverters have two analog input ports and one digital input port, both of which can choose the PID function, and are specially used for the drive of multi-channel signal input control such as proportional linkage and winding machine.
7. It can protect the motor, start smoothly, eliminate mechanical shock, protect mechanical equipment and reduce motor maintenance costs.
Continuously improving the mechatronics level of textile machinery can better apply AC frequency conversion technology to the control of textile machinery. Vector frequency converters and general-purpose frequency converters can already meet 70% to 80% of the requirements of the textile industry for frequency converters.
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