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Specifying, servicing, or sourcing an electric wheelchair starts with knowing what each part is called, where it sits, and what it does to the rest of the chair. This guide names the parts of an electric wheelchair from the power system outward and explains how they change the frame compared with a manual chair.
The parts of an electric wheelchair are the frame, the drive system (two electric motors and gearboxes), the battery pack, the controller with its joystick, the drive wheels and casters, the seating system (seat, backrest, armrests, footrests or legrests), and the brakes. A manual wheelchair shares the frame, wheels, seating, and brake parts; an electric wheelchair adds the motors, battery, and controller, and its frame is reinforced where those power components mount. Huang Wei, an ISO 9001 certified aluminum frame manufacturer in Taiwan, has produced welded wheelchair frames and parts for a Canadian wheelchair brand since 2010.
An electric wheelchair is easiest to understand as four layers built on one structure. The frame is the structure: everything else bolts to it. The power layer — motors, battery, controller — makes the chair move. The rolling layer — drive wheels, casters, and brakes — carries and stops it. The seating layer — seat, backrest, armrests, footrests — supports the user. If you are comparing with a manual chair, the parts of a wheelchair guide covers the rolling and seating layers in detail; this guide concentrates on the power layer and the frame that carries it.
Five parts exist only on a powered chair: the drive motors, the battery pack and its tray, the controller and joystick, the motor brakes (electromagnetic brakes that hold the chair when power is off), and the freewheel levers that disengage the motors so the chair can be pushed manually. Everything else — frame, casters, seating, footrests — has a manual-chair equivalent, though the electric version is usually heavier-duty.
Most electric wheelchairs use two motors, one for each drive wheel, each driving through a gearbox. Because the two wheels are driven independently, the chair steers by running the motors at different speeds — there is no steering linkage. The motors mount to the frame on brackets near the drive wheels, which is why the motor-mount area of an electric wheelchair frame is reinforced and welded to tighter alignment than a manual frame: a misaligned motor mount shows up immediately as a chair that pulls to one side.
The battery pack stores the energy for the motors and the controller. It is the heaviest single component on the chair, so it is mounted as low as possible — usually in a tray or cradle under the seat, between or just ahead of the drive wheels — to keep the centre of gravity low for stability on slopes and when turning. The battery tray is a welded part of the frame; its strength and position determine the chair’s balance. For scale, Huang Wei’s own Enjoy Go electric mobility scooter carries a 25.8 V, 8.1 Ah (205.8 Wh) battery for a 30 km range at a complete-vehicle weight of about 17 kg — an example of how battery capacity, frame design, and overall weight are balanced in a powered mobility product.
The controller is the chair’s electronic brain. It reads the joystick (or an alternative input such as a head array or sip-and-puff control), converts the user’s command into power to each motor, limits speed and acceleration, monitors battery state, and manages the electromagnetic brakes. The joystick module normally mounts on the armrest; the main control module mounts on the frame near the battery. On an OEM frame, the controller needs a protected mounting point and cable routing that keeps wiring away from pinch points at the folding or seat-adjustment mechanisms.
An electric wheelchair has two braking functions. Dynamic braking is done by the controller, which slows the motors when the joystick returns to centre. Parking is done by electromagnetic brakes on the motors, which engage automatically when the chair stops or loses power, so the chair cannot roll on a slope. The freewheel levers release these brakes for manual pushing. Manual wheel locks, standard on a manual chair, are often omitted on a powered chair because the motor brakes do that job.
Drive wheels are the powered wheels connected to the motors; casters are the unpowered swivelling wheels that follow. Their position defines the chair type: rear-wheel drive (drive wheels at the back, casters in front) is stable at speed and tracks straight outdoors; mid-wheel drive (drive wheels in the centre, casters front and rear) turns in the smallest circle and suits indoor use; front-wheel drive climbs obstacles well. Because the drive wheels are motor-driven, they are smaller than manual rear wheels and have no handrims.
The seat, backrest, armrests, footrests or legrests, and headrest are the same families of parts found on a manual chair, but on a powered chair they are frequently power-adjustable: tilt, recline, and seat elevation are driven by actuators mounted between the seat frame and the base frame. Each actuator adds a load path that the frame must carry, which is one reason electric wheelchair frames are built as two structures — a base frame carrying motors, battery, and wheels, and a seat frame carrying the seating system — joined by the tilt or lift mechanism.
Steel and aluminum alloy are both used. Steel is common on heavy-duty bases because of its lower material cost. Aluminum alloy is chosen where weight matters — transportable powered chairs, folding power chairs, and seat frames — because it is lighter and corrosion-resistant, and after T4 or T6 heat treatment it recovers the strength lost in the weld zone. Huang Wei manufactures aluminum wheelchair frames and welded components, with TIG welding for precision joints and in-house T4/T6 heat treatment since 2018; the materials discussion for the manual-chair case is in the wheelchair parts materials guide.
Four areas carry loads a manual chair never sees: the motor mounts (torque reaction and alignment), the battery tray (concentrated mass, vibration, and the need to keep the pack secured in a tip), the actuator mounts for tilt or lift (cyclic loads every time the seat moves), and the caster forks on a mid-wheel-drive base (which take the impact of kerbs). On an OEM program these are the areas where frame drawings are reviewed most closely and where weld inspection concentrates.
A frame manufacturer such as Huang Wei produces the welded structure — base frame, seat frame, battery tray, motor and actuator mounting brackets, caster forks, cross-braces, footrest hangers, and similar aluminum parts — to the wheelchair brand’s drawings. The motors, gearboxes, battery pack, controller, joystick, and actuators are electronic and electromechanical systems supplied by the brand’s chosen system supplier and integrated at assembly. The frame manufacturer’s responsibility is to make sure every mounting interface on the frame is in the right place, at the right strength, so that those systems fit and perform.
A frame drawing or CAD model with the mounting interfaces for your chosen motor, battery, and actuator systems; the material and finish specification; the intended chair class (transportable, mid-wheel indoor, heavy-duty); and the expected annual volume. From that, Huang Wei provides design and development support, material preparation, TIG welding, T4/T6 heat treatment, grinding, and finishing in-house, and can produce samples for fit and load evaluation before the production order. MOQ and lead time depend on the frame specification, tooling, and batch size, and are confirmed per project. Details are on the OEM aluminum medical wheelchair and aluminum frame wheelchair parts pages.
What are the parts of an electric wheelchair?
An electric wheelchair consists of a frame; a drive system of two electric motors with gearboxes; a battery pack in a low-mounted tray; a controller with a joystick or alternative input; drive wheels and casters; a seating system of seat, backrest, armrests, and footrests or legrests; and brakes, including electromagnetic motor brakes with freewheel release levers. The motors, battery, controller, and motor brakes are the parts a manual wheelchair does not have, and the frame is reinforced where they mount.
How does an electric wheelchair steer without a steering wheel?
Each drive wheel has its own motor, and the controller runs the two motors at different speeds to turn the chair — faster on the outside wheel, slower or reversed on the inside wheel. The unpowered casters simply swivel to follow. This is called differential steering, and it is why there is no steering linkage on an electric wheelchair and why the motor mounts must be aligned accurately on the frame — a misaligned mount makes the chair pull to one side.
Where is the battery on an electric wheelchair, and why?
The battery pack sits in a tray under the seat, low on the base frame between or just ahead of the drive wheels. It is the heaviest single part, so mounting it low keeps the centre of gravity down and the chair stable on slopes and in turns. The tray is a welded part of the frame and must hold the pack securely under vibration and in the event of a tip, which is why it is one of the reinforced areas of an electric wheelchair frame.
Can an electric wheelchair be pushed manually?
Yes, when the motors are disengaged. Electric wheelchairs have freewheel levers, usually one at each motor, that release the electromagnetic brakes and disconnect the gearbox so the wheels turn freely. With the levers engaged again, the motor brakes hold the chair automatically whenever it stops or power is off. Freewheel mode is intended for short-distance pushing by an attendant, not for use on slopes, because the parking brakes are released while the levers are disengaged.
Can electric wheelchair frames and parts be made to an OEM’s own design?
Yes. Aluminum base frames, seat frames, battery trays, motor and actuator mounting brackets, caster forks, and other welded parts can be manufactured to a wheelchair brand’s drawings. Huang Wei supports OEM programs with design and development assistance, TIG welding, T4/T6 heat treatment, and finishing in-house under ISO 9001, and has supplied a Canadian wheelchair brand since 2010. MOQ and lead time are confirmed per project. Samples are available; contact the sales team with a drawing to begin.
Huang Wei Technology has manufactured aluminum frames and welded components in Taiwan for more than 30 years, holds ISO 9001 certification since 2012, and has supplied a Canadian wheelchair brand since 2010 alongside aluminum frames for Giant and seat frames for Taiwan High Speed Rail. Our medical mobility line covers wheelchairs, walkers, and mobility scooters, with design and development support, TIG welding, MIG robotic welding introduced in 2019, in-house T4/T6 heat treatment, and finishing in one facility. Request a sample or discuss your electric wheelchair frame program with Huang Wei.