5t superconducting magnet energy storage density

What is a large-scale superconductivity magnet?

Keywords: SMES, storage devices, large-scale superconductivity, magnet. Superconducting magnet with shorted input terminals stores energy in the magnetic flux density (B) created by the flow of persistent direct current: the current remains constant due to the absence of resistance in the superconductor.

What is superconducting magnetic energy storage (SMES)?

(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.

How much energy can a superconducting magnet release?

The energy stored in the superconducting magnet can be released in a very short time. The power per unit mass does not have a theoretical limit and can be extremely high (100 MW/kg). The product of the magnet current (Io) by the maximum allowable voltage (Vmax) across it gives the power of the magnet (Io Vmax).

What is attainable magnetic flux density?

Although the attainable magnetic flux density limits the energy per unit volume given by Equation (1) ( B2 /2μo), the real limit of the energy stored in a SMES is mechanical. The virial theorem gives a relation between the minimum mass of the mechanical structure, Mmin, and the stored energy, Wmag. For a solenoid this relation is:

What are electromagnetic energy storage systems?

In practice, the electromagnetic energy storage systems consist of electric-energy-based electrochemical double-layer capacitor (EDLC), which is also called super capacitor or ultra capacitor, and magnetic-energy-based superconducting magnetic energy storage (SMES).

Is SMEs a good energy storage device for an electromagnetic launcher?

Due to its high power density, SMES is a very interesting energy storage device for an electromagnetic launcher. Furthermore, SMES being a current source is more suitable than the presently used capacitors, which are voltage sources. Indeed, the energy conversion efficiency has the potential to be much higher with a SMES than with capacitors.