348 Ë 9 HTS Maglev bearing and flywheel energy storage system
In China, four HTSB prototypes have been developed. The Institute of Electrical En-
gineering of the Chinese Academy of Sciences constructed a prototype with ASB, PM
bearing, and electromagnetic bearing, whose maximum speed goes up to 9600 rpm
[74]. Beijing Jiaotong University also developed a prototype with ASB, PM bearing,
and electromagnetic bearing [75]. In ASCLab at SWJTU, J. S. Wang et al. manufactured
a FESS principle model with two ASBs[76] and conducted basic studies on the cha-
racteristics [77, 78]. They then developed a magnetic motor based on a RSB with a
maximum speed of 9901 rpm [79].
9.4.3Double ASBs system
The common problems of HTS Maglev technology in large-scale applications, espe-
cially for FESS, are the relatively low load capability and stiffness compared with
active magnetic levitation systems. With continuous improvements of the HTS bulk
materials, it is believed that the load capability, stiffness, and dynamic stability of
HTS Maglev system can be largely improved so that it can meet the requirements of
industrial applications. With further efforts, the whole bearing system will be greatly
simplified [62]. From this point of view, a double ASBs system (full HTSB system) was
fabricated for a FESS model.
As shown in Fig. 9.12, the double ASBs system is a vertical structure and its
total height is 610 mm. The system is mainly composed of three parts: a support
platform, two ASBs and a driving module. The support platform is a circular base
Fig. 9.12:Schematic overall view of the double ASBs system.