• Tel:0086-0755-2985 1810
  • Mob:0086-137 1431 6361
  • E-mail:eddie@okagv.com
  • Address:Building 14, Zhongliang Fuan Industrial Zone, Dayang Road, Fuyong, Baoan, Shenzhen. PRC.

The traditional AGV is powered by battery, it’s a driverless automatic transportation vehicle equipped with non-contact guidance device and independent locating system. The power and driving distance of traditional AGV are extremely limited due to battery power supply, which causes low usage rate of AGV. Frequent charging to the AGV battery is a must for higher usage rate. For completing charge while AGV still working on the production line, a charging station must be installed and set in the place (like transportation section, turning section, loading section, etc) where the AGV could stop temporarily of the whole production system, charges for AGV at certain times and places. A charging station is assembled by baseplate installed on a board or at the side of AGV route with brackets, and the current collector on AGV.

   The charger provides current for baseplate, the current collector on AGV will contact with the charging baseplate when AGV drives to the charging position, charging to AGV starts. With the development of powerful batteries, it’s allowed for quick charging in few seconds, which of the technology makes it possible to finish charging while AGV still working on the productive line.Usually the AGV is powered by traditional “high-magnification opening nickel-cadmium battery ”, which meets the need of quick charging and heavy current discharging. But it also brings trouble in usage and maintenance due to the memory effect of nickel-cadmium battery. At the same time, the cadmium from the battery will cause pollution to the environment. Besides, the increasing of the numbers of charging stations will cost it more for the total building of AGV transportation system.

    On-vehicle charging connector
   Batteries
   Connector for ground charging

    With the development of IPT(Inductive Power Transfer, also the Wireless Power Supply), it will greatly improve the AGV power supply system when IPT used for AGV logistic transportation system. This power supply system can provide driving power and controlling power for vehicles, and keep charging or charge at certain times for AGV battery under the situation of no charging stations. But IPT is limited by underground power cable, which goes against site-transformation and lowers the route flexibility.

   Online automatic charging system
        The AGV adopts high-capacity nickel-cadmium battery, which provides higher acceleration for driving system on start due to the heavy discharging current in short time. In another hand, the maximum charging current of this battery could be 6 times or even heavier than the rated discharging current,it saves charging time when using the heavy current charging. AGV can be charged on line to quickly refill the lost electrical quantity during the online parking and operating time, which makes it possible for AGV keeping working for 24 hrs online. A ground charging connector is installed at the charging position of AGV route, and the assorted charging connector is installed at the bottom of AGV body. When AGV moves to charging position, AGV charging connector connects with the slide connecting part of ground charging connector, the maximum charging current will be 200A.

   IPT
       The power supply system of wire is conveyed by the sense prower supply device or IPT, and the route power controller provides ongoing-circulating high-frequency AC. Two route cables are installed, one for output current, one for returning current, for reversed flow, in this way there will be a double-strong magnetic field between the two cables, but no magnetic field outside the cables. The best position of sense power supply device of AGV is that it’s just parallel to and 10mm above the route cable. One side power will disappear if out of the route until current collector keeps the right position to the route cable. A signal cable is installed by the side of power cable, the positioning sensors should be installed at fixed points ±5mm near the signal cable according to the production rhythm.
Comparison of the two ways
Compared Items
 
Online automatic charging
 
Wireless charging
 
Remarks
 
Project Scale
 
Small
 
Big(Specific)
 
The former requires to bury the cable
 (short, less than 4 meters) from charger
 to charging point,the latter requires to 
bury the cable on a whole circuit.
 
System Flexibility
 
Good
 
Bad
 
Reconstruction required once technique 
changed. For the latter, when any vehicle
 damaged, it needs to be removed from 
the route by hand. 
 
System Pricing
 
Normal
 
Normal
 
No much difference
 
Accuracy
 
High
 
High
 
The cable of the latter can replace the 
magnetic guidance tape of the former.
 
Life of usage
 
Normal
 
long
 
Battery replacement needed for former.
 

For reproduction, please specify from this website:http://www.okagv.com/AGV_Knowledges_14801995.html


Issued date:2013年04月12日 page views:

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