Design of an HTS motor

In this paper, a novel high-temperature superconductor (HTS) permanent magnet (PM) vernier motor is proposed for direct-drive propulsion, which can directly offer the low-speed high-torque capability and the high-speed rotating field design to eliminate the gearing mechanism and maximize the power density, respectively. The key is to newly introduce HTS bulks to flux-modulation poles that can effectively modulate between the high-speed rotating field of armature windings and the low-speed rotating field of the PM outer rotor. Also, the use of HTS bulks can greatly reduce the flux leakage and hence improve the torque density. Based on using the finite element method, the motor performances are analysed. Hence, the validity of the proposed motor is verified.

Section: B Realizationmentioning

confidence: 99%

A Novel HTS PM Vernier Motor for Direct-Drive Propulsion

Chau

2011

“…This can be accomplished by using either warm iron or cold iron. The armature windings are based on the second generation yttrium barium copper oxide tapes [9]. It is composed of 8 racetrack yttrium barium copper oxide coils.…”

Section: B Machine Realizationmentioning

confidence: 99%

Design and Analysis of a HTS Vernier PM Machine

Li¹,

Chau²

2010

This paper proposes a novel high-temperature superconductor (HTS) vernier permanent-magnet machine which can offer low-speed high-torque operation under line frequency. The key is to newly introduce the flux-modulation poles which modulate the high-speed rotating field in the stator to become the low-speed rotating field in the airgap. Also, the use of HTS armature windings can greatly reduce the power loss and improve the power density. By using the time-stepping finite element method, the machine performances are analyzed. Hence, the validity of the proposed machine is verified.

“…Some of these technologies have been demonstrated in the past by different groups either by using Gd-based superconducting bulks on the designing of an axial-gap type synchronous propulsion motor [2], or by using 2G-HTS wires for the prototyping of synchronous induction motors [3]. Likewise, at the Department of Engineering of the University of Cambridge, U.K., the concept of a fully HTS motor has been studied since 2005 [4], where multiple stator and rotor designs have been explored [5][6][7][8][9][10]. In the original design [4], the field and armature windings of the EPEC HTS motor were intended to be made of 2G-HTS wires, but this idea was rapidly abandoned due to the high cost of the machine and the lack of knowledge on the performance of stacks of superconducting wires subjected to crossed and rotating magnetic fields, the latter an issue recently covered by some of the authors of this paper [11].…”

Section: Introductionmentioning

confidence: 99%

“…In the original design [4], the field and armature windings of the EPEC HTS motor were intended to be made of 2G-HTS wires, but this idea was rapidly abandoned due to the high cost of the machine and the lack of knowledge on the performance of stacks of superconducting wires subjected to crossed and rotating magnetic fields, the latter an issue recently covered by some of the authors of this paper [11]. Thus, the four-pole motor design had to be reconsidered in 2007 [5], leading to the prototyping of the first fully HTS superconducting motor at EPEC, with the rotor being composed by an array of seventy-five YBCO superconducting bulks [12] attached to the surface of a cylindrical shaft [6], and the stator is made of an array of six 2G-HTS racetrack coils [7]. However, the control and operation of this motor in synchronous regime demonstrated to be too challenging at this stage, and it was not up to 2013 when an adequate control system was embedded [8].…”

Section: Introductionmentioning

confidence: 99%

“…This system, which in brief is a variable-voltage variable-frequency open-loop control system, paved the way in 2014 for the realization of the first tests with a continuous operation of the HTS motor in a liquid nitrogen bath [9]. For a more thorough discussion on the experimental setup and the devised HTS motor at the EPEC laboratories, we recommend to the reader to see references [6][7][8][9]. Here, it is only necessary to notice that the magnetic poles of the rotor configuration in [9] where created by the PFM of individual columns of five HTS bulks, and this strategy was studied in detail in [10].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

HTS Motor Performance Evaluation by Different Pulsed Field Magnetization Strategies

Huang

Wang

Jin

et al. 2017

Abstract-A fully high temperature superconducting (HTS) motor has been built in the EPEC laboratory at the University of Cambridge, UK. Two different pulsed field magnetization (PFM) strategies have been implemented for studying the magnetization of a cylindrical rotor designed by an asymmetric array of superconducting bulks. Asymmetric or uneven distribution of superconducting bulks could occur when the size of the superconducting bulks is compromised due to the curvature of the rotor and the design aims to cover the largest area as possible for the magnetic poles. It is certainly an unusual design which nevertheless deserve to be explored, as possible misalignments between the superconducting poles to be magnetized by PFM can be studied when an uneven arrangement of columns of superconducting bulks is implemented for along a cylindrical shaft. In the first of the PFM strategies, only six out of fifteen columns of superconducting bulks have been effectively magnetized, and the performance of the resulting rotor has been compared with the case when the PFM strategy leads to the magnetization of up to 93% of the superconducting bulks. The advantages and disadvantages of each of the PFM strategies is discussed.