16
AC motor: select and use double-speed AC motor, the type number is YD160L-16/4H
(horizontal type), it is the sealed type three-proof motor, normal power is 2KW/8KW;
rotating speed is 361r/min/1460r/min, the azimuth and elevation motor are same.
Elevation decelerator: planetary gear decelerator, the type number is NGW11-9
(horizontal type), deceleration ratio: i=7.1.
Azimuth decelerator: cycloid pin wheel decelerator, the type number is XW5.5-5-1/9,
deceleration ratio: i=9.
Worm gear-worm pair: SG-71-type plane secondary enveloping surface torus worm pair,
the worm is single-head type, deceleration ratio: i =40, the azimuth and elevation
worm gear- worm pairs are same.
Lead screw-nut pair: the screw thread parameter is Tr150X14, the azimuth and elevation lead screw- nut pairs
are same.
The final stage of driving chain is lead screw-nut pair, which has self-locking capability.
The antenna can apply the brake safely at any position and at the same time the nut pair
use double nuts for backlash elimination.
3.1.2.4 Synchronization Device
The azimuth and elevation synchronization devices are respectively installed on the
azimuth and elevation axle heads, the corners of axis is transformed into the electrical
signals and output to obtain the position information of antenna.
3.1.2.5 Limit Device
In order to make the antenna rotate within the safe range, install safe limit protection
device on the azimuth and elevation axle heads of antenna to make the antenna operate
safely.
The limit device consists of the limit switch and mass. The limit swicths are respectivily
installed on the two extreme positions of travel range of azimuth and elevation axes, when
the antenna travels the extrem position and the mass touches switch, the power supply is
switched off.
3.1.2.6 Platform and Ladder
For the convenience of maintenance and ensuring safeguard, the guardrail, ladder
and platform are installed on the antenna pedestal.
