Digital transformer technology mainly relies on the principle of electromagnetic induction to convert a certain AC voltage level into another AC voltage level of the same frequency. The role of digital transformer technology is not only limited to voltage transformation, but also can realize current and impedance transformation through digital transformer technology.
1 Overview of digital transformer technology
According to the relevant information, we can understand the working principle of digital transformer technology. At the same time, we also understand that the characteristics of the digital technology of the transformer in the no-load operating state are: the voltage ratio of the primary and the primary. secondary windings of digital technology from the transformer to the primary and secondary windings. The turns ratios are the same. According to the corresponding formula, it can be understood that a good transformer has several windings. If the voltage value of the winding operation is higher, then the number of turns of the winding will be greater. Test the current flowing through the winding. the current value The smaller the cross section of the wire, the smaller the diameter of the wire. Similarly, if the voltage value of the winding is low, the number of turns of the winding will not be significant. At the same time, test the current flow. If the current passing is large, it means that the cross section. of the wire is large, and the diameter of the wire The greater it is. For a digital transformer, the different windings inside the digital transformer have different voltage levels, so the current rating of the windings will also be different. The current rating of windings with smaller voltage levels is higher. In actual working conditions, digital transformer technology must control the current of each winding within its rated current. The total capacity of the transformer digital technology itself is the sum of all the capacities of the secondary side. When selecting the capacity of the transformer digital technology, not only the total capacity should be considered, but also the real capacity of all voltage levels. covered. In order to keep the transformer digital technology under normal operating conditions instead of overload, the total capacity of the transformer digital technology must be greater than the required load capacity. At the same time, it is also necessary to pay attention to the manufacturing of the transformer. Digital technology measures the voltage level twice. The capacity is greater than the charge capacity of this voltage level.
2 Determination of the digital technological load of the transformer
In order to scientifically, reasonably and accurately select the capacity of the digital technology of the transformer in the electrical control circuit of the machine tool, the first thing that the designer of the machine tool control circuit needs to do is to calculate the capacity Total digital technology of the transformer to support the load. In actual calculation work, we cannot simply directly add up each carrying capacity or estimate its total capacity. Designers should make corresponding capacity calculations based on a comprehensive understanding of the actual needs of the machine tool’s electrical control circuit, that is, the operation and action sequence of each component of the electromechanical control system. Designers should consider the problem holistically, as well as the interference each electrical device may cause to other electrical devices during actual operation, and finally determine the capability of the digital transformer technology applied in the electrical control circuit of the machine tool.
3 Load analysis of electrical machine tool control devices
This article takes the selection of the digital technology capacity of the transformer in the electrical control circuit of a CA6140 machine tool as an example to further explore related issues. (1) Spindle control. A close analysis of the electrical control circuit of CA6140 machine tool and the electrical component list of CA6140 ordinary lathe shows that a CJ10-10/110V contactor is used to operate the 4 kW spindle drive motor . The power of the contactor coil is 65 VA instantaneously and 11 VA continuously. When the engine is running, the KM contactor works, that is, the instantaneous starting power is 65 VA and the holding power is 11 VA. (2) Cooling pump and rapid motion control. To control the 90 W cooling pump motor and the 250 W fast moving motor, two JZ7-44 intermediate relays are used. Each intermediate relay coil has a starting power of 68 VA and a holding power of 10 VA. During normal operation of the machine tool, up to two relays can operate at the same time, i.e. the two intermediate relays start with a maximum power of 136 VA and a holding power of 20 VA.
4 Transformer digital technology selection and capacity allocation
According to the above requirements for the control electric load power of machine tools, when selecting the digital technology of the transformer, if all the load power is provided by digital technology of the transformer, it can be calculated that The total load capacity of this digital transformer technology is 11+20+. 60.15= 91.15VA. Multiplied by the safety factor of 1.1, the load capacity is 100.2 VA. JBK2-100VA was selected according to the transformer’s digital technology product catalog.
5 Questions to Pay Attention to When Selecting Transformer Digital Technology and Capacity Allocation
If the electrical control circuit of the machine tool is very complex, the selection of the digital technological capacity of the transformer should also be more careful and rigorous. If a single transformer digital technology is used to power all loads, this will inevitably lead to an increase in the capacity of the transformer digital technology, which will increase the volume of the transformer digital technology itself. In this context, the installation. of devices in the control cabinet will also cause extremely negative effects that will cause great obstacles in the wiring work. And since a digital transformer technology supports all loads, it is easy to cause unwanted interference factors between different loads. In order to effectively improve this problem, two or more transformer digital technologies can be used to share all loads, making each transformer digital technology an independent individual to power the circuit. Isolate highly interfering inductive loads from interference-sensitive electronic systems. To give a relatively simple example, when two digital transformer technologies bear the load, one digital transformer technology bears the load of electrical equipment such as contactors and relays, and the load of the microcontroller and control system is distributed across the other digital transformer technology. , of course, for work on calculating the digital technological capacity of the transformer The operations must also be carried out separately and cannot be confused with each other. Only in this way can we ensure that the choice of digital technological capacity of the transformer in the electrical control circuit of the machine tool is rational, scientific, applicable and normative. and ensure that the electrical control circuit of the machine tool can operate in the best possible way. In working condition, the stability and reliability of machine tool work are improved.
Daguang focuses on providing solutions such as precision CNC machining services (3-axis, 4-axis, 5-axis machining), CNC milling, 3D printing and rapid prototyping services.
