According to this definition, a magnetron is used in radar equipment. Radar is used for the location of things and mapping out terrain. Tavros' legs were robotic at that point, and no doubt had some sort of stabilizing function... perhaps the pelvic magnetron auto-adjusted the legs to ensure maximum stability with respect to the surface the legs were on, but the magnetron that Equius installed wasn't functioning properly? That would explain why Tavros fell so much (the auto-stabilizer got false readings from the magnetron/radar) and why Equius needed to deactivate it.