New Low Emittance Rings are nowadays increasingly considering the use Permanent Magnets in their designs. The use of Permanent Magnets in the new Low Emittance Rings has mainly two advantages: in the one hand, it allows a more compact distribution of magnets, since there is no need of coils and water cooling; in the other hand, it allows to reduce the running costs and the carbon footprint of the facility thanks to the removal of the power supplies associated to conventional electromagnets. However, the use of Permanent Magnets also presents some serious challenges. These challenges include the loss of flexibility ...