Abstract
The current carrying ability of the high temperature superconducting (HTS) material would be seriously influenced by the additional complex magnetic field. Because of this effect, the HTS material cannot be adapted in the field of high speed motors that work with high frequency current and strong magnetic field density. Therefore, this paper presents a novel HTS high speed motor system with high efficiency, high power density and high speed that could be adopted in the field of flywheel energy storage and high efficiency propulsion system. The one armature winding of the novel HTS high speed motor system is the superconducting coils, and the other armature winding is copper winding. Under this configuration, the motor with two armature windings is the doubly-fed motor. The two kinds of windings should operate in synchronous state. In this paper, a 2kW, 12000r/min high speed flywheel energy storage motor is designed. Surface magnetic field distribution of the superconducting winding and the characteristic of this type motor are detailed analyzed based on the current carrying ability of the HTS material. The new configuration of our novel HTS motor broaden the application of HTS materials in various electrical fields.
Highlights
With the growing shortage of energy, the demand of high efficiency energy is becoming urgent
Superconductor has the character of zero resistance and Meissner effect at low temperatures, and the application of high temperature superconducting (HTS) material in motor systems could realize high efficiency and high power density that has become a research focus on application of superconducting technology [1], [2]
Bq1(−) = Fqm(λ1/2) cos[(q − pr )φ −(ωq −pr ωrm)t −α −pr θr0]. It can be seen from the equation (15) that by modulating stator winding magnetic motive force (MMF), six kinds of magnetic field with different frequency are produced in the air-gap
Summary
With the growing shortage of energy, the demand of high efficiency energy is becoming urgent. Ferromagnetic material is adopted to decrease the magnetic field on the superconducting coils surface This structure can acquire both high torque and high speed to increase the motor’s power density. The three-phase winding fundamental magnetic motive force (MMF) of the two kinds of the winding are respectively shown as (9) and (10) It can be seen from Fig. that magnetic resistance rotor has ideal magnetic resistance characteristic taken no account of the effect of cogging torque and magnetic potential in ferromagnetic material. Equation (16) can be rewritten as (17) with (7), (8) and (15) brought into It can be seen from the equation (15) that by modulating stator winding MMF, six kinds of magnetic field with different frequency are produced in the air-gap. In the six kinds of the flux density described by the equation (15), Bp0 and Bq0 are the pulsation magnetic field which cannot produce back EMF and torque; when p, q and pr are adapted the specific value, the frequency of the last four kinds of magnetic field can be equal to the frequency of the winding current
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