The structure of the prototype super motor/generator is schematically illustrated in Fig. 1. The two rotors and the stator are placed in a single vacuum chamber, and the shaft is Fig. 1. Schematic diagram of the prototype super motor/generator which is a synchronous four-pole machine. Fig. 2. (a) Principle of torque generation in the super motor.
Assuming a tape width of 4 mm and a thickness of 0.1 mm, composed mostly of copper and Hastelloy, the volume of the wire is only about 400 cm3 (for the superconductor itself, only 4 cm3), and the weight is less than 3.6 kg.
A SMES operating as a FACT was the first superconducting application operating in a grid. In the US, the Bonneville Power Authority used a 30 MJ SMES in the 1980s to damp the low-frequency power oscillations. This SMES operated in real grid conditions during about one year, with over 1200 hours of energy transfers.
superconductors is about 1 meV.(3.46)3.2.1 Condensation EnergyWe now calculate the di®erence in energy between the superconducting and normal states; this is alled the energy of condensation into larly, the di®erence of potential e ergies from Eq. 3.35 is¢2Vs ¡ Vn = ¡ (3.49) V since Vn = 0. T
(1) When the short is opened, the stored energy is transferred in part or totally to a load by lowering the current of the coil via negative voltage (positive voltage charges the magnet). The Superconducting Magnetic Energy Storage (SMES) is thus a current source [2, 3]. It is the “dual” of a capacitor, which is a voltage source.
e solid curve is drawn for the BCS theory of supercon-ductivity.Figure 1.9: Ratio of the electronic thermal conductivity in the superconducting state to that in he normal state of aluminum (dots) as a function of temperature. The curve is calcu-lated from the BCS theory of superconductiv-ity, and shows the
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