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Application of low voltage servo in intelligent storage and logistics
With the rapid rise of e-commerce industry in recent years, it has brought rapid development to intelligent warehousing and logistics industry. Agvs are an integral part of the traditional warehousing and logistics industries that have been unable to meet customer needs and have had to introduce automated equipment quickly. AGV started from warehousing and logistics industry and has been widely used in logistics, express delivery, automobile manufacturing, home appliances, textile, medical treatment, paper making, tobacco and electronics industries.
Second, the use of AGV vehicles in intelligent storage and logistics industry
In large warehousing and logistics industries, AGV is mainly used in transportation. In the 21st century, China's demographic dividend no longer exists, and there is a shortage of labor in manufacturing enterprises. Besides, large warehousing, logistics and other industries have a high work intensity, which is not conducive to long-term labor. At the same time, the logistics industry in the new era is developing towards the trend of Internet of things, which inevitably requires automatic handling equipment that can be connected with the Internet. All these factors contribute to the wide application of AGV car in these industries.
At present, there are three kinds of AGV motion control structures in China. One is the ordinary two-wheel differential structure, one is the wheel rudder structure, and one is the common hub structure of electric vehicles. The two-wheel differential structure mainly realizes the steering by making the velocity difference between the two motion axes. The type of wheel rudder is a special mechanical structure of AGV car. The encoder is external and has a special steering motor shaft. The principle of hub structure is similar to two-wheel differential structure. At the same time, in some applications the AGV will be in the form of a four-wheel omni-directional movement, commonly known as the McNamara wheel.
Iii. Application of low-voltage servo drive scheme in AGV
At present, the traditional AGV vehicle motor drive control system usually adopts the brushless dc motor + planetary reducer scheme, which has low cost. However, due to the lack of control accuracy, reliability and other aspects of this scheme, it is difficult to meet customers' increasingly high requirements for AGV vehicle. The drive control scheme of low-voltage servo system + planetary reducer has become a trend.
Hollysys motor co., LTD., relying on its own years of digital ac servo motor drive system development experience, quickly launched the AGV car for low-voltage servo system + planetary reducer drive control package. This program has the following features and advantages:
Power supply voltage DC24V -- 80V. The large range and fast movement of AGV car needs to solve the problem of power supply. It is not suitable to use the usual 220V power supply. It must be the convenient dc power supply.
The control mode realizes all data transmission through CAN to achieve fast response.
Low-voltage servo motor is adopted for the motor shaft. The motor power can be selected from 100w-750w according to the load size. The number of axes can be selected from two axes, four axes and five axes according to the needs of customers.
Due to the strict limitation of the whole space of the car, the low-voltage servo motor of the jacking shaft USES a specially developed motor to achieve large torque output, high stability and high precision control in the whole motion control process. Precise walking and reversing can be achieved through the coordinated motion between motors.
No brush and commutator, reliable operation, low requirement for follow-up maintenance; Stator winding heat dissipation is more convenient; The inertia is small and easy to improve the quick response of the system. The positioning accuracy is high and the control mode can be diversified. Suitable for high speed high torque working state; Smaller volume and weight at the same power.
In order to meet the requirements of different customers, in addition to the standard single shaft drive, the company took advantage of the opportunity to launch the two axis one, four axis one and other options.
The above schemes have been successfully used in batches on AGV cars in two major industries of warehousing and logistics. The low-voltage servo drive control system of sunchuang brand guarantees the movement stability and accuracy of AGV cars with its superior performance. In the operation effect can be completely comparable with the performance of imported products, in the cost-effective has a higher advantage.
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