Motor cooling device having flow rate adjusting means for a coil end cover

摘要

A motor cooling device having good cooling performance, which is adapted to promote heat transfer between a coil end and a coil end cover even if the flowing amount of oil is small. A heat of a stator is withdrawn by the oil flowing around the coil end. For this purpose, the motor cooling device comprises a flow path formed between an outer face of the coil end and an inner face of the coil end cover, and a flow rate adjusting unit for changing a cross-sectional area of the flow path by moving the coil end cover toward the coil end or away from the coil end. The flow rate adjusting unit widens the cross-sectional area of the flow path in case a feeding amount of the oil to the flow path is relatively large, and narrows the cross-sectional area of the flow path in case a feeding amount of the oil to the flow path is relatively small.

主权项

1. A motor cooling device, which is adapted to withdraw heat of a stator through fluid flowing around an end portion of a coil of the stator, comprising:
a coil end cover that covers the end portion of the coil; a flow path for letting through heat transfer fluid, that is formed between an outer face of an end portion of the coil and an inner face of the coil end cover; and a flow rate adjusting means that changes a cross-sectional area of the flow path by moving the coil end cover toward the end portion of the coil or away from the end portion of the coil; wherein the flow rate adjusting means widens the cross-sectional area of the flow path with an increment of the heat transfer fluid supplied to the flow path, and narrows the cross-sectional area of the flow path with a reduction of the heat transfer fluid supplied to the flow path.