Fobos-Grunt spacecraft high gain antenna drive mechanism

Purpose:

Rotates high gain antenna about two perpendicular axes Qualification: Ground development tests completed

Performances:

Rotation angle range ,° ±85 Scan speed, °/s up to 4 Output shaft rotation step, arcmin 0,04 Pointing accuracy, arcmin ±0,04 Self-braking torque (unpowered), N·m, no less 2 Torque achieved, N·m, no less 10 Stiffness, N·m /rad, no less 104 Operating temperature range, °C –40 to +50 Life expectancy, °, no less 1 500 000 Dimensions, mm, no more 370×370×250 Mass, kg 7,0 Angle sensor Rotary encoder, error ±25′