Wheelchair suppliers introduce the motion design of electric wheelchair machines. After selecting the working principle, the required motion and power conditions for the machine's execution can be determined based on the requirements of the working principle. Then, combined with the predetermined type and performance parameters of the prime mover, the motion design of the machine can be carried out. Properly selecting and designing the mechanism combination (transmission part) of the machine, transforming the motion of the prime mover into the expected mechanical action of the executing part, and considering the necessity, possibility, and reliability of flexible adjustment within certain performance parameter ranges. These contents will be based on the study of some commonly used institutional designs in future chapters.

After the power design of the electric wheelchair is determined by the transmission and execution parts of the machine, the required driving power of the machine can be calculated based on the operating characteristics of the machine, the working resistance of the execution part, the working speed, and the total efficiency of the transmission part. Combined with the corrosive working conditions of the wheelchair, a shared prime mover (or several selected according to the needs of each transmission system) can be selected for driving.

For general machines, after selecting the prime mover, the load of any component can be calculated based on power, operating characteristics, and the specific working conditions of each component. So starting from the overall situation of the machine, considering a series of issues such as the required working capacity (strength, stiffness, service life, etc.), corrosion, weight, technical economy, etc. of each component, design or select each component. These contents will be discussed in detail for corroded components in the future.

In addition to the design of electric wheelchairs, there are also the workmanship and design of nursing beds and mobility scooters.