Intelligent lighting is one of the most popular research objects in the lighting industry in the near future. Currently, the network technologies for intelligent lighting include Bluetooth, WiFi, and ZigBee. Compare the principles, technical features, advantages and disadvantages of the three schemes, and look forward to the future of the intelligent lighting market.
ZigBee (Zigbee Protocol)
ZigBee is a low-power LAN protocol based on the IEEE802.15.4 standard. Currently, the frequency band used in the world is 2.4 GHz. The advantages of this technology are: first, low power consumption. Two No. 5 batteries, in standby mode, can be used for 6-24 months. Second, low cost. No need to change the traditional electrical circuit, just direct access to the ZigBee wireless module for intelligent control. Third, the network is large. The mesh topology can hold up to 65,000 devices. Fourth, ZigBee's network nodes can feel
Knowing the existence of other nodes, determining the connection relationship, organizing into a structured network, and self-repairing when the node changes, automatically adjusting the network topology. Fifth, ZigBee provides data integrity checking and authentication functions. It uses AES-128 encryption algorithm to ensure the security of information in each application. Relatively, there are some restrictions, such as lower insulation throughput; need to support large networks. The order of magnitude of the contacts (to be connected to the operating platform using WiFi); low speed, focusing on ground transmission applications in limited space.
Bluetooth 4.0 (Bluetooth Protocol)
Bluetooth 4.0 is a combination of IEEE802.15.1 traditional Bluetooth, IEEE802.11 physical layer and MAC layer and Wibree. The biggest breakthrough and technical feature is the low-power transmission of Wibree. It uses simple GFSK modulation and thus has a pole. Low operating and standby power consumption, even a single button battery can support the device to work for more than a few years. The network topology of Bluetooth 4.0 is simpler than that of ZigBee's star topology, and the transmission rate is several times higher than that of ZigBee. It has a large advantage over NFC in terms of transmission distance, and its wide application in the field of mobile phones and audio, as a The new technology that came out soon, the future development is limitless. The disadvantages are limited data transfer size, low number of device connections, and single connectivity of Bluetooth devices.
WiFi (Wireless Fidelity Protocol)
WiFi (Wireless Fidelity) is a short-range wireless transmission technology that supports data, image, voice and multimedia with an output rate of up to 54Mb/s. It can be received by Internet accessors within a few hundred meters. Radio signal. The advantages are wide transmission range, fast transmission speed, health and safety, and high popularity.
All three methods have their own advantages. The advantage of WiFi is that it is widely used and has spread to thousands of households. The advantage of ZigBee is low power consumption and self-organizing network; the advantage of Bluetooth is that the networking is simple. Experts pointed out that the current good solution is to turn ZigBee through WiFi to WiFi, which has the universal compatibility of WiFi and the low power consumption and low cost of ZigBee.
The development of direct-drive servo motors for steering wheels was mainly targeted at precision agricultural machinery. It can complete agricultural machinery operations, achieve precise positioning, improve agricultural productivity, effectively use agricultural resources, and protect the ecological environment. This is an effective way to achieve high-quality, high-yield, low-consumption, and sustainable environmentally-friendly agriculture. It can achieve fast, efficient, high-precision and automated operations on large areas of arable land. It is mainly used in multiple production links of land production, pesticide sowing, harvesting and spraying, which greatly improves production efficiency and land use.
Motor design characteristics:
adopts direct drive motor design
Waterproof and dustproof design
Integrated design of motor and servo control
Easy and fast installation
The rotor is directly coupled to the load shaft
Control performance characteristics:
AC Servo Solution Design
SVPWM vector control, fast system dynamic response
Dedicated encoder, high control accuracy and good stability
With speed control mode and position control mode
Extremely high running accuracy:
This machine adopts sine wave, vector control and high-precision magnetic encoder, with high control precision, which can ensure that the vehicle can walk within the error range of ± 2cm.
Good control line performance:
The torque of the direct drive servo motor increases in proportion to the input current and does not change with speed and angular position. The relationship between torque and current is linear. Multi-pole structure design, low motor torque ripple coefficient, stable operation, can effectively reduce the "S" curve amplitude when the vehicle is going straight
Powerful acceleration and deceleration capabilities:
The direct drive design of the servo motor enables gearless transmission. The ratio of torque to inertia on the load shaft is much better than gear transmission, which greatly improves the acceleration capability of the system, and greatly improves the ability to go online quickly in applications and the ability to correct errors under high-speed vehicle operation
Not easily deformed
The direct drive motor is mounted directly on the load shaft. No gear gap, no elastic deformation, high transmission efficiency, good rigidity, etc., suitable for steering wheel control characteristics. While ensuring high torque, it is also convenient for human emergency operation
Faster response time
The mechanical constant and electrical time constant of the direct drive servo motor are small, which ensures fast response in applications under a wide range of operating speeds, greatly improving the sensitivity of the system and improving the straight line of operation.
Automatic Moto,Moto Automatic,Steering Motor,Automatic Steering Motor
Jinan Keya Electron Science And Technology Co., Ltd. , https://www.keyaservo.com