Powerline Communication Technology (PLT) refers to a wired communication method that uses high-voltage power lines, medium-voltage power lines (10kV voltage level) or low-voltage power lines (380/220V subscriber lines) as an information transmission medium for voice or data transmission.
Conventional power line communication techniques use a modulated high frequency carrier signal to communicate on an existing power line. Therefore, power line communication is commonly referred to as Power Line Carrier -PLC ( Power Line Carrier -PLC). The principle is similar to that of ordinary radio communication, except that the channel for carrier signal transmission is the power line, as shown in the following figure:
The use of power lines as a signal transmission medium to achieve communication is a technology that research and development departments of various countries such as power, communications, and networks have been working on. Power line communication is usually divided into voltage levels of the power grid, which can be divided into high-voltage power line communication (above 35kV), medium-voltage power line communication (1kV to 35kV), and low-voltage power line communication (less than 1kV, 380V/220V). From the perspective of the carrier signal frequency, bandwidth and data transmission rate used, the low-voltage power line communication technology is divided into narrow-band power line communication technology and broadband power line communication technology.
Power Line Narrowband Communication (NPLC) Technology
Frequency range: generally 9k ~ 500kHz, the US FCC regulations are 100k ~
450kHz, EN50065-1 of the European Electrical Standards Committee (CENELEC) specifies 3k ~ 148.5kHz;
Communication rate: generally several hundred bps to tens of Kbps;
Modulation technology: FSK, BPSK, spread spectrum, OFDM modulation, power frequency zero-crossing modulation, etc.
Power Line Broadband (BPLC) Communication Technology
Frequency of use: between 2MHz and 30MHz.
Communication rate: above 1 Mbit/s, physical layer rate is up to 200 Mbit/s, TCP/IP layer rate is up to 80 Mbit/s; modulation
Demodulation technology: various spread spectrum communication technologies, OFDM technology, etc.
Domestic and foreign application status and technical characteristics
Domestic application status
The current application status of low-voltage power line carrier communication in China is as follows:
1. Low-voltage power line narrowband carrier communication technology
The low-voltage power line narrow-band carrier communication technology is used in the acquisition system, and the application time is earlier and the scale is the largest. In recent years, with the gradual improvement of low-voltage power line carrier communication technology, more than ten domestic companies (Neusoft, Dingxin, Xiaocheng, Mi Yawei, Ruisikang, Lihewei, etc.) are focusing on technology development and application. The technology mainly includes spread spectrum plus narrowband frequency shift keying (FSK), spread spectrum plus narrowband phase shift keying (PSK), Orthogonal Frequency Division Multiplexing (OFDM), etc., in the use of electricity information collection, smart home energy management Large-scale applications in areas such as building monitoring and street lighting control.
2. Low-voltage power line broadband carrier communication technology
In recent years, low-voltage power line broadband communication technology has been rapidly developed, and there are also a large number of applications in the use of electricity information collection. The products of many companies in China (Shenzhen Power, Zhongdian Huarui, Neusoft, CITIC, etc.) have mature applications in power line broadband access and power line information collection based on power line broadband.
In order to solve the problem that the low-voltage power line broadband carrier communication core chip has always relied on imports, reduce the cost of power line broadband carrier-related equipment, and realize the independent development of power line broadband communication technology, in January 2010, State Grid Corporation officially established a power line with independent intellectual property rights. Broadband communication chip and its practical solution.
The domestic low-voltage power line broadband carrier communication technology standard was formulated late. In 2010, China released the power industry standard "DL/T395-2010 low-voltage power line communication broadband access system technical requirements" and the postal and telecommunications industry standard "YDB055.1-2010 broadband customer network Networking Technical Requirements Part 1: Power Line (PLC) Networking, National Power System Management and Information Exchange Standardization Committee is currently developing the power industry standard "Intelligent Power Line Broadband Communication Technology Requirements".
A 24V Dc Motor Consistency is good, reliable performance, low malfunction, torque, motor no-load and load running more smoothly and the lowest in 50 decibels
Functions: 24V dc motor rotor part of the armature iron core, armature, commutator and other devices, 24V dc motor is suitable for most of the electronic products, such as Electric curtains, car, sweeping robot, no hakaze fan, etc
Areas of application:
Method of use: the best stable in horizontal plane, installed on the 24V dc motor output shaft parts, cannot use a hammer to knock, knock prone to press into the 24V dc motor drive, may cause damage to internal components, and cannot be used in the case of blocked.
Operating temperature range:
24V dc motor should be used at a temperature of -10~60℃.
The figures stated in the catalog specifications are based on use at ordinary room temperature catalog specifications re based on use at ordinary room temperature (approximately20~25℃.
If a 24V dc motor is used outside the prescribed temperature range,the grease on the gearhead area will become unable to function normally and the motor will become unable to start.Depending on the temperature conditions ,it may be possible to deal with them by changing the grease of the motor's parts.Please feel free to consult with us about this.
Storage temperature range:
24V dc motor should be stored ta a temperature of -15~65℃.
In case of storage outside this range,the grease on the gearhead area will become unable to function normally and the motor will become unable to start.
Service life:
The longevity of geared motors is greatly affected by the load conditions , the mode of operation,the environment of use ,etc.Therefore,it is necessary to check the conditions under which the product will actually be used .The following conditions will have a negative effect on longevity.Please consult with us should any of them apply.
â—Use with a load that exceeds the rated torque
â—Frequent starting
â—Momentary reversals of turning direction
â—Impact loads
â—Long-term continuous operation
â—Forced turning using the output shaft
â—Use in which the permitted overhang load or the permitted thrust load is exceeded
â—A pulse drive ,e.g.,a short break,counter electromotive force,PWM control
â—Use of a voltage that is nonstandard as regards the rated voltage
â—Use outside the prescribed temperature or relative-humidity range,or in a special environment.
â—Please consult with us about these or any other conditions of use that may apply,so that we can be sure that you select the most appropriate model.
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