| 摘要 |
The technical problem was to find a magnetic circuit arrangement having permanent-magnet flux which, just like a transistor in a DC circuit, can vary significantly larger currents and voltages by means of a small control current, and in a magnetically analogue manner can produce considerably larger field and flux changes in a magnetic circuit arrangement by means of a small electromagnetic control field and flux. As Figure 1 shows, the implementation has been achieved with the aid of metamagnetic layers 5 which are integrated in the magnetic circuit and have distinct magnetic switch properties. Small control field changes in the control core 10, 3, with the coil 7, weaken or amplify the permanent-magnetic field in the conversion region of the metamagnetic threshold field strength of the layers 5 and lead to large field and flux changes in the yoke core 6 and an induction current excess in the coil 8 during the demagnetisation phase of the yoke core 6, especially when the anti-ferromagnetic stray flux (below the threshold field strength) of the layers 5, with the compensation circuit SK, P, is easily (slightly) overcompensated. The resultant magnetocaloric energy deficit in the magnetic circuit can be covered by low-temperature heat and low-temperature conversion into electrical energy is thus made possible for the first time both on a large scale and on a small scale. <IMAGE>
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