Design and Analysis of a New HTS Linear Flux-Controllable Doubly Salient Machine

This paper proposes a new high-temperature super-conducting (HTS) linear flux-controllable doubly salient machine for high-power long-stator applications, which incorporates the merits of both the HTS-excitation machine and the primary-excitation linear machine. The key is to adopt the modular mover to obtain the phase symmetric magnetic circuit as well as effectively reduce the cogging force due to module complementary effect, while the HTS-excitation windings and armature windings are physically separated to reduce space conflicts between each other and easily implement static seals of cooling Dewar. Also, the air-gap field can be flexibly regulated by changing the HTS-excitation current, thus facilitating to extend the operating speed range. The operation principle analysis, cooling Dewar design, and key parameters determination are conducted in detail. By using the finite-element analysis, the machine performances with emphasis on flux-controllable features are analyzed to verify its validity.