AGV casters serve three core functions in automated material handling systems: supporting the weight of equipment and cargo, executing movement and steering actions, and maintaining operational stability. Casters are the only contact point between an AGV and the floor; all weight is transferred to the ground through the casters, and all motion commands are executed by them. Caster performance directly affects an AGV’s load capacity, positioning accuracy, battery efficiency, and safety reliability.
The Specific Role of Casters in an AGV System
Breaking down an AGV, its core systems include the navigation system (telling the AGV where to go), the control system (deciding how to get there), the drive system (providing power), and the caster system (executing motion). Casters may seem like the most basic component, but they are the execution endpoint of all upper-level systems.
In terms of load bearing, the AGV’s own weight plus cargo weight is entirely transferred to the floor through the casters. The load capacity of the casters determines how much weight the AGV can carry. If caster load capacity is insufficient, the tread may flatten and deform at best, or the bracket may deform and cause the AGV to tip over at worst.
In terms of motion execution, an AGV’s forward movement, reverse movement, and steering are ultimately all realized through the casters. Drive wheels provide power, driven wheels roll passively, and swivel wheels adapt to direction changes. The rolling resistance, steering resistance, and friction coefficient of the casters directly affect the AGV’s motion performance.
In terms of stability, AGVs are affected by acceleration and deceleration, centrifugal force during turns, and uneven floors during operation. The wheel diameter, tread material, and bracket rigidity of the casters determine the AGV’s vibration amplitude and stability. If the casters are unstable, cargo on the AGV may shift or even fall off.
In terms of cushioning, the tread material of casters (especially polyurethane and rubber) has a certain degree of elasticity, which can absorb impacts caused by minor floor irregularities. This cushioning effect protects precision components on the AGV, such as navigation sensors and controllers, as well as the cargo being transported.
How Caster Performance Affects Overall AGV Performance
Impact on battery life. The greater the rolling resistance of the casters, the more torque the AGV motor needs to output to overcome that resistance, and the faster the battery drains. Reducing caster resistance is one effective means of extending AGV battery life. Casters with high resistance can shorten AGV battery life by 10% to 20%.
Impact on navigation accuracy. The AGV navigation system calculates travel distance through encoders. If the caster diameter decreases due to wear, a discrepancy will arise between encoder readings and actual travel distance. Tread slippage can also cause odometry errors.
Impact on docking accuracy. AGVs require precise positioning when docking, typically within ±10mm. The steering resistance and self-centering characteristics of the casters affect the AGV’s positioning accuracy in the final few centimeters.
Impact on noise. AGVs typically operate in workshops where people work, and noise directly affects the working environment. Casters are one of the main noise sources of an AGV; tread material, bearing type, and bracket structure all affect noise levels.
Impact on safety. If a caster suddenly fails while the AGV is operating under load — for example, the tread detaches or the bearing seizes — it may cause the AGV to lose control or tip over, resulting in cargo damage or safety accidents. Caster reliability is the foundation of safe AGV operation.
How to Evaluate Caster-System Compatibility During Selection
Selecting AGV casters is not about picking an individual component; it requires evaluating the compatibility between the casters and the entire AGV system.
Match with the navigation system. If the AGV uses magnetic navigation, docking accuracy requirements are relatively lenient, and caster selection can be somewhat relaxed. If laser navigation or visual navigation is used, accuracy requirements are high, and the resistance consistency and diameter stability of the casters become more important.
Match with the drive system. The power and torque of the drive motor must match the rolling resistance of the casters. If caster resistance is high but motor power is insufficient, the AGV will be unable to move or will accelerate slowly.
Match with load requirements. The rated load capacity of the casters should include a safety margin. Generally, selection should be based on 1.3 to 1.5 times the actual per-wheel load, taking dynamic loads and impact loads into account. Working load is recommended not to exceed 75% of the rated load capacity.
Match with the operating environment. Floor material (epoxy flooring, concrete, anti-static flooring), ambient temperature, humidity, and cleanliness all affect caster selection. For example, cleanrooms require low-dust treads, and cold storage requires low-temperature-resistant treads.
During the AGV system selection phase, system compatibility of casters is more important than the parameters of individual casters. If further confirmation of caster specifications is needed, parameters such as total machine weight, operating speed, floor conditions, and navigation accuracy requirements can be provided to the caster manufacturer to obtain a matched product solution. Zhuoye manganese steel casters offer multiple configuration options in terms of load rating, tread material, and bracket structure, and can serve as one reference option during AGV system selection.
Post time: Sep-08-2026