Stator coil coolant flow reduction monitoring

摘要

A coolant flow reduction monitoring system (92) for a rotary electric machine (90) having stator coils (106) within a plurality of slots (124) of a stator thereof is provided. The stator coils (106) are cooled by a coolant (140) flowing in a plurality of passages (138) provided in the stator coils (106). The system includes an outlet temperature sensor (150) for measuring a coolant outlet temperature of the coolant (140) in an outlet of at least one of the plurality of passages (138), a slot temperature sensor (152) for measuring a temperature in at least one slot (124) at a location along a length of each slot (124) and outside of the stator coils (106), and an inlet temperature sensor (160) for measuring a coolant inlet temperature of the coolant (140). A coolant flow reduction monitor (170) generates an alarm indicating a coolant flow reduction based on the at least one coolant outlet temperature, the at least one slot temperature and the coolant inlet temperature.