  In part II, an op-amp-based drive is proposed and designed. Subsequently, a
very accurate model for the drive circuit and the current loop is developed as
a simulation platform, while its simplified version is derived, tailored for
efficient design purposes. Through a comprehensive evaluation, the accuracy and
efficacy of both the actuator and drive circuit modeling is scrutinized,
showcasing their superiorities over existing approaches. The importance of eddy
current modeling is underscored. Also, the effectiveness of the designed
current loop and its practical trade-offs are engineered and discussed. Then,
three DSP-based position control techniques are implemented: pole placement
with voltage drive, pole placement with current drive, and nonlinear control
with feed linearization. Both full-order and reduced-order observers are
leveraged to estimate the unmeasured states. The performance of control designs
across various applications are evaluated through indices such as rise time,
overshoot, steady-state error, and large-signal tracking in the step response
as well as bandwidth, robustness, phase margin, sensitivity, disturbance
rejection, and noise rejection in the frequency domain. The distinctive
features of implemented control strategy are compared, offering a nuanced
discussion of their respective advantages and drawbacks, shedding light on
their potential applications.
