Radial and axial flux superconducting motors in a levitating rotor configuration

Abstract

Abstruct-The capability of superconducting blocks to be partially magnetized allows both bearing and powering functions in a conventional stator and superconducting rotor configuration. This levitating rotor conception is investigated in the present work by means of the basic parameters: torque, levitation and centering forces in two motors with radial and axial excitation respectively. We report on the design and behavior of a high speed motor with a cylindrical HTSC rotor excited by a conventional four poles four phases armature generating a radial field. We also report on a second motor with a disk shaped HTSC rotor excited by a conventional, four poles three phases, double armature which generates an axial field in the gap. Torque, power and centering and levitating forces measurements will be also provided.

AC Three-Phase Axial Flux Motor With Magnetized Superconductors

“…The experimental rig has been specifically designed for characterizing superconducting motors [3], [8]. It consists of two batteries of 12 V, 55 Ah, as very low impedance power supply, a three-phase PWM converter directly driven by a central PC (personal computer) which synchronizes the data acquisition and the movement of the motor.…”

“…Each of the related effects leads to a motor family. Reluctance motors [2], hysteresis motors [3] and trapped flux motors [4], being hysteresis class asynchronous, and reluctance and trapped field classes synchronous. Due to the high field which can be trapped in the superconducting pellets, it is expected that YBCO pellets can substitute permanent magnets with advantage, but the behavior is not the same, good permanent magnets maintain their magnetization but superconducting pellets maintain the magnetic flux trapped.…”

Preliminary Studies and Test Results of a Superconducting Hysteresis Motor with Multiphase Windings and Variable Number of Magnetic Poles

“…On the other hand, the exploitation of hysteresis in high temperature superconducting materials, when this material builds the rotors of electric motors, results in higher torque values than those obtained in hysteresis motors with ferromagnetic rotors, i.e., higher power density is obtained in comparison with conventional hysteresis motor [3,4,5,6,7]. This higher power density allows considering applications like transportation or variable load winch drives, where the changing of power and torque are the normal operating conditions.…”

Disc Motor: Conventional and Superconductor Simulated Results Analysis

“…Disc motors using HTS materials have been used mainly in two topologies: disc motors where the rotor elements of superconducting materials act as magnets [14] or motors where the rotor is a single superconductor disc presenting hysteresis behaviour composed, for example, by YBCO [15] or BSCCO [16].…”