I'm designing a control rod drive mechanism to drive a 9m control rod of 720 kg in mass at 5 mm/s constant speed. To have a 2 stage gearbox I need a motor that has 50-100 rpm, low power output, low torque and at least have a mass of 60-100 kg. Where can I find a motor like this and please comment if the motor i'm looking for will be feasible for my project.