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How Electric Wheelchairs Work

electric-wheelchairs

You might have a loved one who uses an electric wheelchair, or you might be looking to upgrade from a manual wheelchair to a power wheelchair for yourself for greater ease and comfort. Electric wheelchairs enable a greater sense of autonomy for the user; whatever the case may be, it is interesting to know how it works. 

Electric wheelchairs use batteries to power motors within the base of the chair, enabling the user to control their wheelchair with a basic videogame-like joystick that is within reach on the armrest. Other electric wheelchairs can be controlled by voluntary physical movement.

The technology of electric wheelchairs certainly has come a long way. While joystick-style controllers typically control basic electric wheelchairs, electric wheelchairs have been made even more accessible by offering advanced options to control the device through voluntary physical movements involving the chin, tongue, breath actuation, and lower body control. Read on to learn more about how this happens.

The Mechanics of an Electric Wheelchair

Electric wheelchairs use wet or dry cell sealed lead acid batteries that can be easily recharged in a standard power outlet when not in use. One thing to keep in mind is that the size of the battery can make a difference to the weight and overall size of the power wheelchair. While some might choose a chair with a Group 22NF battery which is compact and suited to indoor, level surface use, others may select a power chair with a Group 24NF battery that is slightly larger but better accommodates outdoor mobility with different terrains. Replacement batteries can easily be found to purchase online.

The batteries generate electricity for the motor located at the base of the power chair. These motors can be found in either a two-pole or four-pole option, both with their own set of advantages and downsides:

Two-Pole Motor Four-Pole Motor
Draws less power from the battery Draws more power from the battery
Better suited for slow, smooth operation Higher torque leads to rougher operation
Better suited to cramped, indoor conditions and level terrain Better suited to uneven outdoor terrain
The wheelchair becomes inoperable if one brush on either pole fails The wheelchair will still operate if one brush on one pole fails

Understanding these mechanical differences can help you decide which of the best electric wheelchairs are suited to your lifestyle and mobility. These factors can influence the power chair’s size and how to use it. Another way electric wheelchairs vary in function is through the method of control.

Types of Controller Interfaces Used for Electric Wheelchairs

You may need a control option other than the conventional joystick, such as your body’s range of movement and the type of space you wish to use your power wheelchair. Having these options increases accessibility and customizability. 

Conventional Joystick

Typically found at the end of the armrest, the conventional joystick functions much like a videogame controller and is intuitive to use. Move the controller in the direction you wish to travel; the further you push the joystick, the faster it will move. Releasing the joystick immediately stops the movement of the wheelchair. This controller may sometimes have an on/off switch and power indicator lights on the joystick panel. The position of the joystick controller can also be customized for increased usability. 

Chin Control

Similar to the conventional joystick, with direction and speed achieved the same way, chin control is a smaller version of the joystick operated by the chin. It is mounted just forward the chin, and the knob can be customized for greater comfort. 

Head Control

The controlling mechanism for this option is mounted behind the head and stimulated by the directional movement of the user’s head (to turn left, you would move your head to the left). A separate and accessible switch usually enables head-controlled electric wheelchairs to be put in reverse when pressed and then pressed again to resume forward motion. 

Tongue Control

The tongue is an intuitive way the body can navigate mobility in any posture. A device is fitted to the roof of the mouth that acts as a sensor for the movement of the tongue to predetermined positions in the mouth. For example, you might touch the left side of the roof of your mouth with the tip of your tongue to turn left. 

Wafer Board Control

If an electric wheelchair user prefers to control their device by hand but requires something with less sensitivity than a joystick, a wafer board provides this option. A wafer board control is usually located on the lap or wheelchair tray for easy visibility by the user with switches to move forward, backward, and side-to-side.

Sip and Puff Control

For those with minimal mobility, this option may be ideal. With this control, the wheelchair user inhales or exhales into a tube at varying degrees of strength to equate to a motion. For example, a forceful exhalation (puff) might propel the power chair forward while a gentle breath stops it. This control option may require some time to master but is still a technological feat. 

Scanner Drive Control

This type of control has a switchboard with a customizable location for ease of reach with four directional lights that flash in a clockwise pattern. When the light facing the direction of desired travel is lit, you flip the switch to move in that direction. For example, when the light on the right is lit, you can press the button to go right. 

Conclusion

Many factors are considered that impact how an electric wheelchair works. This technology has come a long way since its invention.

Understanding some mechanical and functional differences can be essential in deciding which option is best for you or a loved one. 

About the author:

Trevor Fenner is the founder and owner of Mobility Paradise, a one-stop shop for mobility scooters, electric scooters, electric wheelchairs, wheelchairs, oxygen concentrators, lift chairs, saunas, steam showers, massage tables, exercise equipment, electric bikes, massage chairs, and bathtubs. Years ago, Trevor’s grandma had an accident that made her dependent on a wheelchair; this forced Trevor and his family to put her into an elderly care facility. Since then, Trevor would visit her to take a walk around the neighborhood. Mobility Paradise was created because Trevor couldn’t find an online store that offers a wide selection of mobility equipment and educational resources. What started as a business focusing on mobility scooters grew to include all kinds of mobility products. You can shop for the most reliable mobility products at MobilityParadise.com.

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