LOW ROTATIONAL DRAG IN HIGH-TEMPERATURE SUPERCONDUCTING BEARINGS

被引：87

作者：

HULL, JR ^{[1
]}

MULCAHY, TM ^{[1
]}

UHERKA, KL ^{[1
]}

ABBOUD, RG ^{[1
]}

机构：

[1] COMMONWEALTH RES CORP,CHICAGO,IL 60690

来源：

IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY | 1995年 / 5卷 / 02期

关键词：

D O I：

10.1109/77.402628

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

Bearings consisting of permanent magnets stably levitated over high-temperature superconductors exhibit low rotational drag and have the potential to enable high-efficiency flywheel energy storage. The coefficient of friction mu for such storage systems is derived as a function of bearing parameters and is shown to be an appropriate figure of merit to describe bearing losses. Analysis shows that values of mu < 10(-6) enables flywheels. A vacuum-chamber experimental apparatus has been constructed to measure values of mu for various experimental bearing designs. Experimental values for mu at low velocity have been as low as 3 x 10(-7) for an 89-mm-diameter ring permanent magnet stably levitated over an array of melt-textured Y-Ba-Cu-O. An important loss mechanism occurs from eddy currents induced in the rotating magnet due to the discrete nature of the superconductor array.

引用

页码：626 / 629

页数：4

共 16 条

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