A tape guide roller, for use with a tape drive that is configured to receive a length of tape, includes a roller body having an outer surface with one or more grooved areas and one or more non-grooved areas. In one embodiment, the protection device electrically coupled between a first node and a second node of an internal circuit to be protected from transient electrical events. Next, a set of correcting operations is applied to the radiation dose matrix to produce a cumulative voxel radiation dose of the volume. As the incoming signal becomes more stable, the number of samples used in performing a processed signal value is increased toward maximum and the sample rate is decreased. The PWM control portion is configured to control switching of the active rectifier and the closed loop vector control is configured to generate the required duty cycles for the PWM signals that regulate the DC voltage output and force a three-phase current input of the active rectifier to align with a three-phase pole voltage input of the active rectifier.