CT100E VFD in industrial washing machine

Traditional industrial washing machines use multiple two-speed AC motors for speed regulation, which are widely used due to their simple structure, firmness, and low price. But its disadvantage is that the speed regulation performance is poor, the speed change is large, and the vibration is large. With the development of power semiconductor technology, in recent years, AC variable frequency governors have become more popular in industrial washing machines. Industrial washing machines have higher and higher requirements for inverters, and they are required to meet the requirements of industrial washing machines. High starting torque, multi-stage speed , wide voltage range, automatic slip compensation and fast and powerful communication methods and other technical difficulties. And stable performance, can adapt to a variety of complex high temperature, high humidity environment.

How industrial washing machines work

CNC engraving machine control system composition

Fully automatic industrial washing machine refers to a large-capacity washing machine that has functions such as initial washing, washing, rinsing, bleaching and dehydration, and can realize automatic conversion without manual operation between functions.

The industrial washing machine is mainly composed of the outer cylinder, the rotating cylinder, the transmission part, the electrical control cabinet, the left and right sealing covers, the pipeline instruments and the drain valve. The structure of the industrial washing machine generally adopts the horizontal drum type, and the inner and outer drums are made of high-quality stainless steel, which is smooth and bright, corrosion-resistant, with little wear and no damage to the fabric, and the machine has a long service life; the inner drum door cover of the industrial washing machine is equipped with stainless steel. Safety locking mechanism, there is a travel switch on the outer cylinder door cover, the operation is safe and reliable. The working principle of the fully automatic industrial washing machine is that under the unified scheduling management of the timing controller, the asynchronous motor is controlled by the frequency converter to continuously perform forward and reverse rotation to realize the asynchronous movement of water and clothing, so that the water and clothing rub against each other. , rub, to achieve the purpose of cleaning.

Transmission system of industrial washing machine
The transmission system is an extremely important part of the industrial washing machine, and it participates in the whole washing process because it mainly provides power support for the washing machine. The transmission system is composed of an electric motor and various speed change mechanisms. Now the frequency converter is mainly used, so its components are significantly simplified. Generally, it is composed of a frequency converter, an asynchronous motor, a pulley and a transmission belt. And in the whole washing stage, with the automatic adjustment of the frequency of the frequency converter, the constant torque speed change (stepless speed regulation) of the device without impact and intermediate transition (gearbox, speed change device or coupling, clutch, etc.) is realized, so that the The energy consumption of the washing process is significantly reduced.

Application principle of Dolycon CT100E VFD Inverter in industrial washing machine
The washing process of the industrial washing machine: first, add water, wash in forward and reverse directions, after washing, drain the water and enter the dehydration stage. The dehydration stage includes three processes: uniform distribution, medium dehydration and high dehydration. Under the circumstance, rotate forward at a higher speed than the washing process, so that the clothes are evenly attached to the inside of the drum of the washing machine, so that the subsequent dehydration process is stable; after draining, increase the rotation speed to enter the medium-speed dehydration process, and then enter the high-speed dehydration process process to reduce the moisture content of the clothes to the required level. Industrial washing machines require frequency converters to provide high torque, multi-speed, wide voltage range, and automatic slip compensation. The main function of frequency converters in this system is to adjust the rotation speed of the washing machine, so that the washing machine is in a low speed state during the washing cycle, and has a very high speed. smooth torque. During the dehydration cycle, it has a high spin speed. The frequency can also be flexibly set, which is conducive to speed regulation, so that the system can run in a steady state, and the mechanical wear can be reduced, and the service life of the industrial washing machine can be prolonged. Dolycon CT100E General Purpose Variable Frequency Drive has excellent performance such as large starting torque, small running current and perfect fault protection measures.

The inverter adopts a unique wide voltage design of 320v-460v, the starting torque can reach 150% of the rated torque at 0.25hz, and the automatic torque boost function can realize low frequency and large output torque control under the v/f control mode, 16 segments The speed can meet the multi-stage speed control mode of various occasions, the speed regulation range is wide, the acceleration and deceleration process does not stall, and the whole speed is stable.

CT100E General Purpose VFD technical description
Shenzhen Dolycon Technology Co., LTD. CT100E VFD Drive is based on DSP control system, adopts domestic technology-leading non-PG vector control technology, and cooperates with various protection methods, which can be applied to asynchronous motors and provide excellent driving performance. The product has greatly improved the ease of use and environmental adaptability of customers in terms of air duct design, hardware configuration, and software functions.

Technical Features
◆ High reliability model selection: The key components are all well-known brands at home and abroad, among which the inverter module adopts the fourth-generation module of Infineon, and the higher junction temperature of the module can meet the ambient temperature of 50 degrees Celsius without derating!
◆ Large redundancy design: Through strict calculation and experimental verification, key components are designed with large margins to ensure the long-term operation stability of the whole machine in harsh environments.
◆ Optimized vector control: domestic technology-leading vector control without speed feedback, large torque at low frequency and fast torque response.
◆ Software current limiting and voltage limiting function: good voltage and current limiting, effectively limiting the key control parameters to reduce the fault risk of the inverter.
◆Environmental adaptability: higher over-temperature point of the whole machine, independent air duct design, thickened three-proof paint treatment, more suitable for long-term operation in outdoor occasions in oil fields.
◆ Speed tracking restart function: realize the smooth start of the rotating motor without impact.
◆ Automatic voltage adjustment function: when the grid voltage changes, it can automatically keep the output voltage constant.
◆ Comprehensive fault protection: over current, over voltage, under voltage, over temperature, phase loss, overload and other protection functions
◆ A variety of braking modes: provide a variety of braking modes to ensure that the system stops stably, accurately and quickly

Concluding remarks
Industrial washing machines need to automatically switch between different speeds to meet the speed requirements of different process stages. The multi-point VF function of the frequency converter can realize low-frequency low-current in the washing stage and high-speed deep-weakening control in the high-off stage; multi-stage speed can meet three multi-stage speeds. Terminals switch up to eight stages of speed control. The popularity of frequency converters in industrial washing machines is of epoch-making significance for the craft washing machine industry.