Optimization Shape of Variable Capacitance Micromotor Using Differential Evolution Algorithm

Table 4

Results of “ripple optimization” for VCM geometric parameters.

Parameter	DE	GA
Stator pole width 𝜑𝑠	21.693°	28.1454°
Rotor pole width 𝜑𝑟	23.209°	23.9437°
Rotor inner radius 𝑅𝑖𝑟	45.8831 μm	27.2193 μm
Ripple factor R.F0	0.000306	0.0067
Torque 𝑇rms	4.7498 pN⋅m	5.810 pN⋅m
Objective function 𝑓(𝑥)	0.00779	0.17003
Population size 𝑁𝑝	30	80
Number of iteration 𝐺	100	100
Run time	60 hours	160 hours