An electrical gearbox by means of pole variation for induction and superconducting disc motor

Inácio, Steve André Pereira; Inácio, David; Pina, João Murta; Valtchev, Stanimir; Neves, Mário Ventim; Rodrigues, António

doi:10.1088/1742-6596/97/1/012221

Cited by 5 publications

(2 citation statements)

References 6 publications

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“…Con este sistema, se reduce substancialmente el peso del equipo colocado sobre la torre. Como la potencia específica del generador es entre 3 y 6 veces superior a la de un generador clásico, el parque eólico con estos generadores podrá producir de 3 a 6 veces más energía para igual peso de material (Inácio et al, 2008).…”

Section: Rotor Estator 2 Superconductorunclassified

Generador Eólico Superconductor

Rodrigues¹

2010

Inf. tecnol.

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This paper presents the properties of high temperature superconductor (HTS) materials in the construction of electrical machines. A disc type configuration synchronous generator with high specific power for future wind power applications is described. The generator is excited by means blocks of HTS ceramic materials. The mechanism to trap the magnetic flux in HTS blocks is explained. To decrease the weight of the generator on the top of the tower, the cryogenic system used consists of a liquid nitrogen storage container located on the ground to reduce weight on the tower. A flux plot per two poles of the machine calculated using the finite element method is presented and the flux density distribution in the air gap of the superconducting disc generator is also displayed. A high efficiency wind park with this type of generators is proposed.

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Section: Rotor Estator 2 Superconductorunclassified

Generador Eólico Superconductor

Rodrigues¹

2010

Inf. tecnol.

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“…A variety of techniques for changing and control the speed of electric motors have been proposed for decades, including virtual gearboxes, i.e., electronically changing the number of magnetic poles of stator windings during motor operation in multiphase motors [1,2]. 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].…”

Section: Introductionmentioning

confidence: 99%

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

Dionísio¹,

Pina²,

Inácio³

et al. 2013

IFIP Advances in Information and Communication Technology

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Abstract. In this paper a procedure for determining the number of different synchronous speeds that can be obtained from the stator of a drum motor as a function of the number of slots is presented. This preliminary study is foreseen for a hysteresis high-temperature superconducting motor, but the approach is directly applied in conventional motors. The targeted device has multiphase windings, in order to achieve full flexibility in torque-speed space through electronic variation of magnetic poles. Simulations are performed in order to achieve a qualitative understanding of the behaviour of the motor, namely in what concerns to torque and settling times from initial to synchronous speed. A prototype with eighteen slots in the stator and a bulk YBCO rotor is described and built, and experimental values of torque are obtained.

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