Device for starting three-phase motors in a single-phase network. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Electric motors
Comments on the article
Having read in one of the magazines a very interesting article on the topic: "A device for starting three-phase electric motors in a single-phase network", I decided to solder the circuit shown in this article. The circuit's small size and simplicity allowed me to assemble it quickly and without tuning. It really turned out to be very practical in operation, and such advantages as an affordable elementary base, ease of use, small size and weight, reliability, and most importantly, low cost make it possible, without a doubt, to replace capacitor batteries with this electronic device.
In the further operation of this circuit, in order to improve it, I finalized such an important unit as an element for setting the engine operating mode, which made it possible to get rid of its constant regulation at the moments of starting and changing the drive load.
Instead of a variable resistor R7, I used a resistor optocoupler, the lamp of which is connected to the secondary winding of such a transformer TT1, which is in the power supply circuit of the electric motor.
The figure shows a schematic diagram of connecting an optocoupler to a current transformer.
Resistor R1 is designed to limit the current of the zener diode, which, in turn, serves to limit the voltage on the optocoupler lamp at starting moments. Resistor R2 adjusts the circuit to the applied motor. Resistor R4 and selection resistor R3 are designed to limit the minimum value of the phase shift of currents in the motor stator winding.
Instead of a current transformer, elements such as a shunt or magnetically controlled resistors can be used.
Author: D.V. Matvienko
See other articles Section Electric motors.
Read and write useful comments on this article.
<< Back
Latest news of science and technology, new electronics:
Machine for thinning flowers in gardens
02.05.2024
In modern agriculture, technological progress is developing aimed at increasing the efficiency of plant care processes. The innovative Florix flower thinning machine was presented in Italy, designed to optimize the harvesting stage. This tool is equipped with mobile arms, allowing it to be easily adapted to the needs of the garden. The operator can adjust the speed of the thin wires by controlling them from the tractor cab using a joystick. This approach significantly increases the efficiency of the flower thinning process, providing the possibility of individual adjustment to the specific conditions of the garden, as well as the variety and type of fruit grown in it. After testing the Florix machine for two years on various types of fruit, the results were very encouraging. Farmers such as Filiberto Montanari, who has used a Florix machine for several years, have reported a significant reduction in the time and labor required to thin flowers.
... >>
Advanced Infrared Microscope
02.05.2024
Microscopes play an important role in scientific research, allowing scientists to delve into structures and processes invisible to the eye. However, various microscopy methods have their limitations, and among them was the limitation of resolution when using the infrared range. But the latest achievements of Japanese researchers from the University of Tokyo open up new prospects for studying the microworld. Scientists from the University of Tokyo have unveiled a new microscope that will revolutionize the capabilities of infrared microscopy. This advanced instrument allows you to see the internal structures of living bacteria with amazing clarity on the nanometer scale. Typically, mid-infrared microscopes are limited by low resolution, but the latest development from Japanese researchers overcomes these limitations. According to scientists, the developed microscope allows creating images with a resolution of up to 120 nanometers, which is 30 times higher than the resolution of traditional microscopes. ... >>
Air trap for insects
01.05.2024
Agriculture is one of the key sectors of the economy, and pest control is an integral part of this process. A team of scientists from the Indian Council of Agricultural Research-Central Potato Research Institute (ICAR-CPRI), Shimla, has come up with an innovative solution to this problem - a wind-powered insect air trap. This device addresses the shortcomings of traditional pest control methods by providing real-time insect population data. The trap is powered entirely by wind energy, making it an environmentally friendly solution that requires no power. Its unique design allows monitoring of both harmful and beneficial insects, providing a complete overview of the population in any agricultural area. “By assessing target pests at the right time, we can take necessary measures to control both pests and diseases,” says Kapil ... >>
| Random news from the Archive Fujitsu Primergy servers based on Intel Xeon E5 v4 processors
06.04.2016
Fujitsu has announced a complete revamp of its Primergy XNUMX-socket server line, from tower servers to compute nodes for high performance clusters. The new Primergy lineup includes classic tower servers, rack servers, blade servers, compact server nodes for clusters, and dedicated rack models for service providers and hosting companies.
In general, the company updated the following systems: Primergy RX2510 M2, RX2530 M2, RX2540 M2 and RX2560 M2; Primergy TX2560 M2; Primergy BX2560 M2 and BX2580 M2; Primergy CX2550 M2 and CX2570 M2. With new Intel Xeon E5-2600 v4 family processors and up to 4 MHz DDR2400 memory technology, Fujitsu estimates that the new generation of dual-socket Primergy servers deliver approximately 20% performance improvements over the previous generation.
Fujitsu Primergy system users can reduce system cooling energy costs with Fujitsu's Cool-safe Advanced Thermal Design technology, which raises the safe operating temperature from 40°C to 45°C for most rack, floor and scale-out systems. In turn, support for Trusted Platform Module (TPM) 2.0 technology will help protect the IT infrastructure from attacks by intruders, as the systems are able to check communications and manage the data encryption process.
Primergy RX Rack Systems are all-in-one servers optimized for data center rack cabinets that deliver the performance and energy efficiency you expect. Their low failure rates make them the best solution for running business-critical services (such as plant management systems or key business applications). Focusing on the needs of service providers and hosting companies, Fujitsu also launched the Primergy RX2510 M2.
Primergy TX floorstanding systems are cost-effective servers designed for use in office environments. With ease of use, they can be operated by employees without special technical skills. And with low power consumption and quiet operation, dual-socket TX systems are suitable for demanding office environments, including branch offices and healthcare facilities. All TX systems support Trusted Platform Module 2.0 technology as standard, protecting equipment and sensitive corporate data.
Primergy BX blade systems are the building blocks for building converged IT infrastructures. Based on a modular architecture, blade systems demonstrate high density and scalability. This helps companies simplify their infrastructures, reduce costs and increase operational agility.
Primergy CX scale-out systems are specifically designed for cloud environments, high-performance computing and complex computing, including standard workloads of scientific organizations, such as universities and research institutes. With Cool-safe Advanced Thermal Design technology that operates at temperatures up to 45°C, CX systems reduce data center ventilation requirements and, as a result, reduce cooling costs.
|
Other interesting news:
▪ Wobbling bicycle
▪ Photosynthesis for energy production
▪ New isolated 125W AC/DC converter with two outputs
▪ Underwater sacrificial objects discovered
▪ Infineon IRS200S Half-Bridge 2007V MOSFET Driver
News feed of science and technology, new electronics
Interesting materials of the Free Technical Library:
▪ site section Tone and volume controls. Article selection
▪ article In the discussion of what to eat. Popular expression
▪ article What is the Romance group of languages? Detailed answer
▪ article Working with a gasoline injector with an electric compressor. Standard instruction on labor protection
▪ article Tuning antennas with a frequency response meter. Encyclopedia of radio electronics and electrical engineering
▪ article 144 MHz Super Regenerative Receiver. Encyclopedia of radio electronics and electrical engineering
Leave your comment on this article:
All languages of this page
Home page | Library | Articles | Website map | Site Reviews
www.diagram.com.ua
2000-2024
Arabic
Bengali
Chinese
English
French
German
Hebrew
Hindi
Italian
Japanese
Korean
Malay
Polish
Portuguese
Spanish
Turkish
Ukrainian
Vietnamese