The fundamental qualities of the design of the DMI motors have led to a marked increase in the top speed without affecting the service reliability.
The core and winding losses are kept at a low level also at high speeds. This is the result of radially small armature winding slots and amply dimensioned magnetic circuit.
The design work was also focused on increasing the stability of the commutator and reducing its diameter. A smaller diameter gives a lower peripheral speed which ensures proper functioning of the brushes at the highest speeds. In addition vibrations are kept at a low level.
Movements in the coil-ends are prevented by robust supporting rings below the armature coil-ends and by using a massive shaft to prevent its deflection.
Features of the DMI:
- Higher torque quality at low speed
- Higher power and torque
- Higher power at top speed
- Higher speed