A Shielding Method for Armature Reaction in Double Stator Field Modulated Superconducting Motor

Abstract

The invention discloses a shielding method for an armature reaction in a double-stator field modulation superconducting motor, which adopts a double-stator structure, and an inner stator, a rotor and an outer stator are arranged concentrically. Copper wire armature windings are placed on the outer stator, and superconducting magnets wound by superconducting wires are placed on the inner stator, which mainly consists of superconducting coils and cryostats. Arrange the magnetic ring on the outside of the superconducting magnet, rationally design the number of teeth of the outer stator, the number of salient poles of the rotor and the magnetic ring, so that the armature reaction magnetic field can pass through the outer stator, the salient poles of the rotor and the magnetic ring as much as possible, so that It is as far away from the superconducting coil as possible. At the same time, a squirrel-cage damping shielding layer is arranged on the magnetic conducting ring to suppress the fundamental wave and low-order harmonics of the armature reaction, and a copper shielding layer is arranged inside the cryostat to surround the superconducting coil to suppress the high frequency of the armature reaction. subharmonic. The invention can effectively reduce the AC loss in the superconducting winding, and avoid the quenching caused by the excessive AC loss of the superconducting winding.

Description

technical field [0001] The invention relates to the application field of superconducting technology, in particular to a shielding method for armature reaction in a double-stator field-modulated superconducting motor. Background technique [0002] In order to solve the problems faced by superconducting motors such as complex dynamic sealing of coolant, low reliability of brush slip rings, and difficult design of torque tubes, a class of superconducting motors based on the principle of magnetic field modulation has received more and more attention, such as superconducting motors. Conductive switch flux linkage motors, superconducting guide motors, superconducting magnetic gear motors, double-stator superconducting field modulation motors, double-rotor superconducting guide motors, etc. But it is not difficult to find that this type of field modulation superconducting motor has similarities in structure, namely: armature winding and field winding (both can be wound by supercond...

AI Technical Summary

Problems solved by technology

The superconducting DC in the excitation winding superimposes the induced current, which will cause the fluctuation of the excitation current

In short, the armature reaction magnetic field in the magnetic field modulation type superconducting motor is an external alternating magnetic field relative to the superconducting winding, which will not only cause the AC loss of the superconducting winding, but also cause the current fluctuation in the superconducting winding

If no measures are taken to effectively shield the influence of the armature reaction magnetic field on the superconducting winding, it will affect the safe operation of the superconducting winding

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