AMR selection guide
Types of AMRs Used in Warehouse Automation
Compare the main warehouse AMR families by load interface, handoff method, route, storage process and operating constraints before shortlisting a platform.
Goods-to-person
Pallet handling
Start with the task
Warehouse AMRs are defined by what they move and how they exchange the load
An AMR name alone does not describe the complete material-handling function. Two vehicles can use similar navigation while serving very different workflows because one carries totes, another lifts a rack and another enters a pallet. The handling interface, load condition and pickup accuracy often determine suitability before speed or fleet size is considered.
A useful comparison begins with the unit load, the origin and destination, the physical handoff, the route and the response expected when something is unavailable. Those details separate a practical warehouse solution from a platform that looks suitable in a product image but cannot complete the real process.
Tote and carton transport AMRs
These vehicles carry bins, cartons, trays, parcels or small components on shelves, enclosed compartments, lift decks or conveyor tops. They fit pick-to-pack movement, kitting, replenishment, quality inspection and line-side delivery.
Check containment, load identification, transfer height, orientation and whether the handoff is manual or automatic.
Rack-carrying AMRs
A rack-carrying AMR enters beneath a compatible mobile rack, lifts it and presents it at a workstation. The approach can reduce picker travel where inventory is stored in movable racks and the operating area is designed around robot access.
Rack stiffness, underside geometry, floor flatness, workstation protection and inventory orchestration are central design inputs.
Pallet movers and under-rider AMRs
Low-lift or under-pallet vehicles move pallets and stillages between floor positions, stands, conveyors or staging zones. They are suited to repetitive horizontal transport when high stacking is not required.
Pallet entry, underside clearance, carrier condition, load stability and the accuracy of every pickup position need verification.
Autonomous pallet jacks, forklifts and stackers
These vehicles use forks and, for stackers or forklifts, a mast to collect, lift, place or retrieve pallets. They can support staging, putaway and rack interaction where the application requires more than horizontal movement.
Load centre, residual capacity, rack tolerance, aisle geometry, floor condition and elevated-load stability are decisive.
Tugger and towing AMRs
Tugger AMRs pull one or more carts for batch delivery, milk runs, empty-carrier return and line feeding. A single trip can serve several stops where the process is organised around a cart train.
Coupling, trailer tracking, train length, corner sweep, stopping distance and safe manual recovery must be designed as a system.
Transfer-top and specialised AMRs
Roller, belt, lift-table or custom-top modules exchange loads with conveyors, machines and stations. Mobile manipulation adds a robot arm or tool when transport and a physical operation must be combined.
Define datum, handshake, guarding, payload stability, tooling, cycle sequence and the safe state after an interrupted transfer.
Side-by-side view
Compare warehouse AMR types by application fit
The categories can overlap, and manufacturers may use different names. Compare the physical function rather than relying on the label.
| AMR family | Strong application fit | Load interface | Main constraints to verify |
|---|---|---|---|
| Tote or carton carrier | Picking, packing, kitting, replenishment and small-parts movement | Shelf, bay, lift deck or conveyor module | Containment, transfer height, identity and accumulation |
| Rack carrier | Goods-to-person picking with compatible movable racks | Under-rack lift | Rack geometry, floor, workstation design and inventory logic |
| Pallet mover | Horizontal pallet transport, staging and replenishment | Low lift, fork entry or under-pallet support | Pallet quality, clearance, load stability and station accuracy |
| Autonomous forklift or stacker | Pallet pickup, putaway, stacking and rack interaction | Forks and mast | Residual capacity, lift height, aisle, rack and floor condition |
| Tugger | Cart trains, milk runs and multi-stop line feeding | Manual or automatic tow coupling | Train geometry, trailer behaviour, stopping and decoupling |
| Transfer-top or specialised AMR | Automatic machine, conveyor or process-station exchange | Roller, belt, lift, fixture or tool | Handshake, guarding, datum, stability and fault recovery |
Selection criteria
Six inputs usually decide which AMR type belongs in the workflow
1. Unit load and carrier
Record maximum and minimum mass, dimensions, centre of gravity, orientation, surface condition and carrier variation. Include the pallet, rack, cart, fixture or attachment in the handling assessment.
2. Pickup and delivery method
Define whether operators, conveyors, racks, machines or automatic stations perform the handoff. Confirm datum, approach direction, transfer height, tolerances and load-presence confirmation.
3. Route and facility
Survey aisle width, turning space, blind corners, crossings, doors, lifts, thresholds, gradients, floor joints, drainage, lighting, wireless coverage and interaction with manual vehicles.
4. Demand and duty cycle
Use moves by time period, route distance, queueing, transfer duration, shift pattern and peaks. Include empty travel, charging, planned maintenance and realistic availability in capacity calculations.
5. Controls and data
Assign responsibility for task creation, priority, load identity, traffic, station permissions, completion status, alarms and recovery across WMS, WCS, ERP, MES, PLC and fleet software.
6. Safety and recovery
Evaluate the complete application, including people, racks, equipment, loads, manual mode, blocked paths, damaged carriers, communication loss, maintenance and emergency response.
Technology boundaries
AMR, AGV and autonomous forklift are related, but not interchangeable
Autonomous mobile robot
AMR commonly describes a mobile robot that navigates within a mapped operating area and can respond to changing route conditions within its designed limits. The term covers several load-handling architectures.
Automated guided vehicle
AGV commonly describes a driverless vehicle operating on defined guidance or route logic. Modern products can blur the distinction, so compare navigation behaviour, traffic control and recovery rather than relying on terminology alone.
Autonomous forklift or stacker
This is a handling category with forks and, where required, a mast. It may use AMR-style navigation, but lift, rack interaction, load centre and residual capacity introduce additional engineering constraints.
The applicable safety framework depends on the final machine and system. Driverless industrial-truck requirements can include vehicles described as AMRs, AGVs, under-carts, tuggers and other automated truck configurations.
Shortlisting workflow
Reduce risk before requesting a model recommendation
A structured application brief lets suppliers compare like with like and exposes gaps before equipment is selected.
- Map the movement. Mark every origin, destination, route, queue and manual fallback.
- Describe the real load range. Include damaged or variable carriers, not only the ideal sample.
- Define each handoff. Record who or what controls readiness, transfer and completion.
- Measure peak demand. Separate average moves from shift changes, replenishment peaks and dispatch cut-offs.
- Survey constraints. Capture floors, aisles, crossings, doors, lifts, people and manual-vehicle traffic.
- Write acceptance criteria. Include normal flow, blocked routes, unavailable stations, low battery, communication loss and restart.
Common mistakes when comparing warehouse AMRs
Buying around a headline payload
Nominal capacity does not describe load centre, lift height, attachment, carrier geometry or dynamic stability. Compare the approved configuration for the actual load.
Ignoring the handoff
A robot may navigate the route successfully and still fail the process if pallet entry, conveyor alignment, rack pickup or station permissions are inconsistent.
Sizing only for average demand
Peak queues, empty travel, charging and blocked routes can change the fleet requirement. Use time-based demand and realistic operating scenarios.
Treating safety as a vehicle feature
Protective sensing is one layer. Route layout, crossings, load stability, equipment interfaces, manual recovery and operating procedures remain part of the risk assessment.
Leaving integration until commissioning
Task ownership, data mapping, PLC handshakes, alarms and recovery states should be defined early enough to test them with the physical workflow.
Using one platform for every task
A mixed solution may be more practical when tote movement, pallet transport, rack carrying and elevated storage have fundamentally different interfaces.
Next steps
Explore the warehouse workflow behind the robot category
Frequently asked questions
Choosing between warehouse AMR types
Which type of AMR is most common in warehouses?
There is no single best category. Tote carriers, pallet movers, rack carriers, tuggers and autonomous forklifts solve different material-flow problems. The most suitable option depends on the load, handoff, route, storage process and required lift.
What AMR is suitable for moving pallets?
A low-lift pallet mover or under-rider can suit horizontal transport between compatible positions. An autonomous pallet jack, stacker or forklift may be required when fork entry, greater lift or rack interaction is part of the process.
What AMR is suitable for totes and cartons?
Shelf, enclosed-bay, lift-deck and conveyor-top AMRs are common choices. Rack-carrying systems can also support goods-to-person picking when inventory is stored in compatible mobile racks.
Can different AMR types operate in one warehouse?
Yes, provided traffic, task ownership, maps, interfaces, charging, safety rules and fleet coordination are engineered for the combined system. Cross-vendor or mixed-fleet operation requires particular attention to interface compatibility and responsibility boundaries.
Are AMRs suitable for narrow aisles?
Suitability depends on vehicle envelope, turning geometry, load overhang, protective-field behaviour, rack clearance, pickup approach and traffic rules. Measure the real aisle and operating envelope rather than comparing vehicle width alone.
How should payload capacity be specified?
Specify the worst-case load and carrier, dimensions, centre of gravity, required lift, attachment, acceleration limits, route and floor conditions. For lifting vehicles, confirm residual capacity at the required height and load centre.
Match the AMR to the warehouse process
Share the load, route, handoff and demand data with Synergy Robotix to compare suitable transport, rack-carrying, tugger, pallet-mover or autonomous forklift approaches.