Advice on electronic circuit design for an agricultural machine
You should consider using brushless motors. Brushless motors require motor controllers. The normal configuration for a system with brushless motors is a battery with a higher voltage and an electronic motor controller that controls the motors with an effective voltage that is lower than the battery voltage. If the motor speed does not need to be adjustable, the motor controller can be quite simple. Manufacturers are typically using brushless motors for new designs of portable equipment. Look for a piece of portable equipment that has a motor of the power level that you need and examine the design.