First thing to note while selecting a permanent magnet DC motor is the voltage rating & power output of the unit. The voltage rating measures the input DC voltage that a motor can operate on, whereas the power output of a motor indicates the power generated (in horsepower) by the unit. Then, users should take a note of the frame, enclosure, insulation and mounting requirements. The frame data of the motor indicates the shape & size of the selected motor. Enclosure & insulation refers to the outside covering and suggesting if the motor can be used outdoors or not. Mounting data of the motor can tell the users of the mounting pattern & accessories required to install the motor at the desired place.