Design Issues and Future Perspectives for Magnetocaloric Energy Conversion - Magnetocaloric Energy Conversion: From Theory to Applications - page 346

Fig. 8.20 a - c Application of the principle of a permanent-magnet rotor, classication no: R20(3)1
(5)(6)0(8)101(12), d application of the principle of the hybrid motor-magnetizer for the purpose of
magnetocaloric energy conversion, classication no: R20(3)1(5)(6)0(8)101(12)

same time provides magnetization and demagnetization of the AMRs. A stepper
motor, for instance, can operate with a single pole to rotate the rotor. Therefore, we
propose that the research community also investigates such cases, since they could
represent not only ef

cient but also very compact solutions.
In the case of the bi-directional pump, also in rotary magnetic eld sources, no

valve system is actually required. This depends on the design solution for how the
fl ow is applied. However, in the case of the uni-directional pump, a valve

system will undertake the operation for switching the

uid fl

fl uid fl ow direction.

eld source system, where a
bi-directional pump is applied. In this particular case we show two pairs of CHEX
and HHEX. Note that this is only because of the easier illustration. Otherwise, such
system can consist of a single CHEX and a single HHEX, which will most probably
take the position at the front and at the back of the magnet assembly (with regard to
the observer of Fig. 8.21 ).
Although the application of the axial

Figure 8.21 shows an example of a rotary magnetic

ow through the AMRs seems to be
the best and simplest option, we will focus here on other solutions. Therefore, we
show in Fig. 8.21 an example that regards the azimuth

fl uid fl

fl ow through the AMRs for a

two-pole rotating magnetic eld source. A similar situation can be considered for a

multiple-poles rotating magnet assembly.