Optimization Shape of Variable Capacitance Micromotor Using Differential Evolution Algorithm

Table 3

Results of “torque optimization” for VCM geometric parameters.

Parameter	DE	GA
Stator pole width 𝜑𝑠	30.5505°	27.4745°
Rotor pole width 𝜑𝑟	16.5018°	20.5602°
Rotor inner radius 𝑅𝑖𝑟	20.336 μm	25.0634 μm
Ripple factor R.F0	0.1347	0.0418
Torque 𝑇rms	6.0366 pN⋅m	5.9860 pN⋅m
Objective function 𝑓(𝑥)	0.9393	0.9453
Population size 𝑁𝑝	30	80
Number of iteration 𝐺	50	100
Run time	30 hours	160 hours