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通过空心电机轴间接油冷效果更佳。油冷根据是否对内部电磁线绕组等部分进行冷却,可以分为直接油冷和间接油冷。直接油冷有浸油和喷油式两类,浸油式即利用油的绝缘特性,直接将油通入电机内部,浸没定转子,这种方法能有效增强电机内部的传热系数,但浸油式会使转子在运行过程中与油发生摩擦,降低电机效率;喷油式是利用油泵将变压器油喷到转子上设计的固定叶片,通过叶片的旋转作用,将变压器油飞溅到电机定子绕组端部等部件进行冷却。而间接油冷则是冷却油通过空心电机轴和电机外壳体进行循环散热,可直接去除电机内部热量,并且与转子摩擦损耗较小,优势较为明显。
驱动电机扁线化
高功率的需求以及规模效应的到来,使得扁线电机将成为行业主流。以往驱动电机电磁线绝大多数均为圆铜线,由于圆线精度要求等各方面要求相对较低,且小批量的时候可以使用人工,所以经济性相对较好。随着新能源汽车时代的到来,电机正逐步走向高功率、高转速,对于电机的工作效率要求越来越高,因此扁线电机正在成为行业主流,2021 年扁线电机渗透率已经达到 27%,后续随着电机行业规模效应的进一步提升,扁线电机将会持续快速渗透。
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1 Nortel BCM400 4.0 BCM 400 R4 R4.0 64vm 24um Dual PS
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SPECTRALINK 6300 NORTEL MERIDIAN, DIGITAL INTERFACE
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NORTEL CP Module PN: NTPB11AA 08
Nortel 8324FX 24 port Expansion Module DS1404098-E5
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Dual Power Supply and Dual Hard Drive with Raid System
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LOT 300 NORTEL MERIDIAN PHONES M2008 M2616 M2006
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Nortel Networks XLR1202SX 1000SX BayNetworks XLR1202SX
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IBM 39Y9267 Nortel 10 Gb Ethernet Switch Module for IBM