A feasibility study for walk-behind tractor without emission was carried out. We focused on finding an ecological solution using a suitable electric motor to replace the internal combustion engine. The calculations determined the required power of the electric engine and the capacity of the battery pack. The electric motor fundamentals and operation of engines suitable for use in walk behind mowers are presented. We have come to the conclusion that because of its characteristics, the brushless motor with permanent magnets on the DC current (PM brushless DC motor) is most suitable because of its characteristics. It works synchronously. Its' control is simpler than other alternative, which is a synchronous constant-magnet motor (PMSM-permanent magnetic synchronous motor). In the study, we determined the required drive characteristics, we familiarized ourselves with the operation of different versions and characteristics of electric motors, selected the most suitable versions - the type of electric motor, the corresponding controller and the required capacity of the battery pack. A specially sized electric motor that fully complies with our requirements, after a web survey and after discussions with engineers for the development of electric motors, is not yet available on the market. Technically and technologically, the optimization of the electric motor and the motor controller for a walk-behind mower can be made. The economy part of the feasibility study will follow. It will be performed in cooperation with sales and engineering departments of the producers. It will give the cost of developing a particular electric motor for a small-scale production.