This paper gives a conceptual design of a superconducting synchronous motor consisting of both high-temperature superconducting rotating field winding and armature winding. The AC losses of the armature winding of the motor have been investigated experimentally and numerically, by considering the self-field of the superconducting coils and the rotating magnetic field exposed on the armature winding. The recent developments of YBCO-coated conductors present the possibility of achieving a wholly superconducting machine of significantly smaller size and weight than a conventional machine. Both the rotating field winding and the armature winding are composed of YBCO high-temperature superconducting (HTS) coils. A low AC loss armature winding design has been developed for this superconducting synchronous motor. The performance of the machine was investigated by modelling with the finite-element method. The machine's torque is calculated from first principles by considering the angle between the field and the armature main flux lines.
A finite element method code based on the critical state model is proposed to solve the AC
loss problem in YBCO coated conductors. This numerical method is based on a set of
partial differential equations (PDEs) in which the magnetic field is used as the state
variable. The AC loss problems have been investigated both in self-field condition and
external field condition. Two numerical approaches have been introduced: the first
model is configured on the cross-section plane of the YBCO tape to simulate an
infinitely long superconducting tape. The second model represents the plane of
the critical current flowing and is able to simulate the YBCO tape with finite
length where the end effect is accounted. An AC loss measurement has been done
to verify the numerical results and shows a good agreement with the numerical
solution.
This paper presents a control algorithm for starting up a high temperature superconducting
synchronous motor. The mathematical model of the motor has been established
in m-file in Matlab and the parameters have been identified by means of the
finite-element analysis method. Different starting methods for the motor have been
compared and discussed, and eventually a hybrid control algorithm is proposed.
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