This thesis presents the design and analysis of the two main parts of the magnetocaloric refrigeration device: an active magnetocaloric regenerator and a magnetic field source, respectively. For the purpose of the analysis the active magnetocaloric regenerator was designed and numerically evaluated. The results were later used as the basis for design of the magnet assembly. Numerical simulation was performed in order to analyse the performance of the electromagnet and related electromagnetic losses. Results reveal that the main loss occurs due to the resistance heating of the coils. These losses affect the cooling power of the active magnetocaloric regenerator. The results of the multi-parametric analysis provide important guidelines for the selection of the optimal structure of the electromagnet and the active magnetocaloric regenerator. These will serve for implementation of the results in the real prototype device.