| 摘要 |
A rotor is described having ventilating laminations of a configuration permitting casting of the rotor conductors without blocking radially venting passages in the rotor. To effect this result, the triple cage conductor slot configuration of the main rotor laminations is altered in the venting laminations to a coffin shaped slot of equal area thereby providing a greater span between conductor slots for venting slots extending radially between, and separated from, the coffin shaped conductor slots. A kidney shaped manifold serves to communicate the venting slots with circular refrigerant passageways extending laterally through the rotor while a second group of ventilating laminations having radially disposed venting slots partially overlapping the venting slots of the first ventilating laminations permits radial discharge of refrigerant into the rotor air gap.
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