In direct drive configuration, the motor is mounted directly onto the pump housing. Here, both the motor and pump share a common shaft, allowing for a direct transfer of power from the motor to the pump. Direct drives are compact in size and simpler in design, making them easier to install and maintain.In external drive configuration, on the other hand, the motor and pump are separate entities that are connected by a coupling or belt drive. The motor is mounted outside of the pump housing and is connected to the pump through a mechanical linkage. External drives are more complex in size but offer greater flexibility in terms of motor selection and positioning.