**3. SRG design algorithm**

The sizing procedure of the proposed generator starts with assigning the initial key parameters of wind turbine such as, speed and maximum torque. These assigned parameters are used in the calculations of magnetic, geometric and electric parameters in together with the analytical model of the generator.

The design of the generator starts with the precondition design output parameters such as stator geometry, rotor outer diameter etc. A new repetition with revised assigned parameters will be done, if the geometries such as stack length and stator outer diameters cannot satisfy the design parameter requirements. Otherwise, the estimated magnetic, electric and geometrical parameters are used as the design parameters. In other words, stator geometry, inductances, winding specifications, maximum torque, saliency ratio, etc., are determined if the required conditions are satisfied. Finite element (Ansys Electronic Desktop) software is used to analyze the generator's performance related to the output functions such as torque quality,

maximum developed torque, and the magnetic properties such as, magnetic field H and magnetic field B. The process ends if the Ansys Electronic Desktop software results satisfy the design requirements. Otherwise, the process is repeated by updating the assigned parameters such as tip speed ratio, efficiency coefficient, air mass density, current and magnetic loading, pole pitch to air gap ratio and stack aspect ratio to obtain the proper size (**Figure 5** and **Table 2**).

The design constraint need to be satisfied are:

The power rated 1 kW, with electromagnetic torque ≥6.4 Nm, maximum torque ripple ≤9%, maximum back-emf ≥ 100 V.
