To optimize, according to a vehicle speed, a flow rate for cooling.SOLUTION: A cooling system 29 for an embodiment comprises: a rotary electric machine 1; a pump 30 that increases/decreases a flow rate of a refrigerant according to the number of revolutions of the rotary electric machine 1 and feeds the refrigerant under pressure; a first refrigerant passage 31 extending from the pump 30 to the rotary electric machine 1 and guides the refrigerant to the rotary electric machine 1; a second refrigerant passage 32 that branches from the first refrigerant passage 31 and guides the refrigerant to the pump 30; a pressure adjustment valve 40 provided in the second refrigerant passage 32; a first orifice 41 provided further downstream in a flowing direction of the refrigerant than the pressure adjustment valve 40 in the second refrigerant passage 32; a third refrigerant passage 33 that branches in the second refrigerant passage 32 and between the pressure adjustment valve 40 and the first orifice 41 and joins it further downstream in the flowing direction of the refrigerant than the branching position of the second refrigerant passage 32, in the first refrigerant passage 31; and a switching valve 50 provided in the third refrigerant passage 33 and allowing flow of the refrigerant to the first refrigerant passage 31 when receiving pressure equal to or greater than a threshold.SELECTED DRAWING: Figure 1
【課題】冷却流量を車速に応じて最適化する。【解決手段】実施形態の冷却システム29は、回転電機1と、回転電機1の回転数の大小に応じて冷媒の流量を増減させ、冷媒を圧送するポンプ30と、ポンプ30から回転電機1まで延びて冷媒を回転電機1へ案内する第一冷媒流路31と、第一冷媒流路31から分岐し、冷媒をポンプ30へ案内する第二冷媒流路32と、第二冷媒流路32に設けられた調圧バルブ40と、第二冷媒流路32において調圧バルブ40よりも冷媒の流れ方向の下流位置に設けられた第一オリフィス41と、第二冷媒流路32において調圧バルブ40と第一オリフィス41との間の位置から分岐し、第一冷媒流路31において第二冷媒流路32の分岐位置よりも冷媒の流れ方向の下流位置に合流する第三冷媒流路33と、第三冷媒流路33に設けられ、閾値以上の圧力を受けたときに第一冷媒流路31への冷媒の流れを許容する切替バルブ50と、を備える。【選択図】図1
COOLING SYSTEM FOR ROTARY ELECTRIC MACHINE
回転電機の冷却システム
2019-09-19
Patent
Electronic Resource
Japanese
COOLING SYSTEM OF ROTARY ELECTRIC MACHINE AND COOLING METHOD OF ROTARY ELECTRIC MACHINE
European Patent Office | 2019
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