Development of a totally enclosed fan cooled traction motor

The intake of dust and dirt-contained outside air into the motor while driving causes the maintenance of dismantling and clean-up operation once every three years. Besides, excessive acoustic noise during high speed operation is produced by the cooling fan on the rotor. Totally enclosed, airtight motor was developed not only to deal with the dust intake problem and thereby eliminate the requirement of periodical dismantling and clean-up operation, but also to reduce acoustic noise. Excessive noise of internal cooling fan was decreased by newly developed uneven pitch blade fan. Further, traction motor without external fan was developed thermo-fluid simulation. These motor were tested.