Active Surface Compensation for Large Radio Telescope Antennas

Table 5

Design parameters of GBT actuators.

Stroke	51 cm
Positioning accuracy	25 μm
Speed	250 μm/s
Static load	481 kg
Dynamic load	186 kg
Service life	20 years, 1270 meters per year
Type of motor	DC brush motor
Position sensor	Linear variable differential transformer (LVDT)