Rotators

MI-840

MI-840 Family of RCS Rotators

MI-840 RCS Rotators are highly engineered azimuth-over-elevation positioning systems with a very compact size and extreme torque density. They are used in conjunction with our MI-830 Family of RCS Pylons to support various targets for the purpose of Radar Cross Section testing.

  • Low profile positioning
  • Accurate azimuth and elevation axes
  • Load capacity up to 50,000 lbs
  • Interchangeable tip design matches rotator needs with MI standard or custom pylons

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RCS rotators are among the most highly engineered products in the industry. Their low profile allows them to be contained almost completely within a test article. In their very small envelopes, rotators deliver remarkably high torque, making use of heat treated steels and innovative mechanical drive technologies. Conventional connections in the mechanical drives are eschewed in favor of those that provide superior integrity and safety. Structural components and connections are rigorously analyzed with FEA and classical methods to ensure that safety factors exceed MI Technologies’ rigid safety standards.

MI-840 Rotators have target load capacities of 500 lbs (227 kg) through 50,000 lbs (22,680 kg). See accompanying chart for available standard models. Custom rotators for specific applications may be designed to customer specification. MI-830 Pylons with corresponding capacities are available for all rotators.

Compatibility between smaller rotators and pylons of up to 3,000 lbs (1,361 kg) capacity is achieved by virtue of a structural element called a rotator tip. These refined interfaces serve to adapt smaller rotators to pylons of various geometries. A continuous smooth surface is maintained at the junction of the rotator tip and its mating pylon. Removal and installation of these smaller rotators is facilitated by an access panel located at the base of the pylon. The fasteners that attach the rotator and its tip are brought to the base of the pylon where the access panel will not interrupt the polished surface where it matters most – within the electromagnetic test zone. Larger rotators, those above 3,000 lb capacity, are attached to their pylons by various other means. In all cases, the rotator tip may be configured as required for customer’s needs. All electrical, RF, and fiber optic services are contained within the pylon.

The MI-840 Family of RCS Rotators are typically used in a compact range or far-field measurement system to measure the radar signature of a device (target). These rotators sit atop a variety of RCS pylons and create a positioning system that combines high weight bearing, accurate positioning and low RF reflectivity. This positioning system is synchronized with the RF instrumentation to provide the RCS measurement data. Data analysis of the range measurements using the MI-3048 RCS Analysis Software completes the RCS measurement results.

Specifications

MI Rotators MI-840-0.5K MI-840-1.5K MI-840-3.0K MI-840-5.0K MI-840-8K MI-840-15K MI-840-20K MI-840-30K MI-840-50K
Target Weight 500 lbs
(227 kg)
1,500 lbs
(682 kg)
3,000 lbs
(1,364 kg)
5,000 lbs
(2,268 kg)
8,000 lbs
(3,629 kg)
15,000 lbs
(6,820 kg)
20,000 lbs
(9,072 kg)
30,000 lbs
(13,640 kg)
50,000 lbs
(22,680 kg)
El Delivered Torque 500 ft-lbs
(678 Nm)
1,500 ft-lbs
(2,034 Nm)
2,000 ft-lbs
(2,712 N-m)
5,500 ft-lbs
(7,457 Nm)
10,000 ft-lbs
(13,558 Nm)
19,500 ft-lbs
(26,438 Nm)
50,000 ft-lbs
(67,791 Nm)
65,250 ft-lbs
(88,467 Nm)
 307,500 ft-lb
(416,914 N-m)
Az Delivered Torque 200 ft-lbs
(271 Nm)
350 ft-lbs
(474 Nm)
720 ft-lbs
(976 Nm)
800 ft-lbs
(1,085 N-m)
2,000 ft-lbs
(2,711 Nm)
5,000 ft-lbs
(6,779 Nm)
10,000 ft-lbs
(13,558 Nm)
20,833 ft-lbs
(28,246 Nm)
31,031 ft-lb
42,072 N-m)
Elevation Travel -45°, +5° -45°, +5° -45°, +5° -40°, +5° -35°, +5° -30°, +5° -30°, +5° -30°, +5°  -30°, +5°
Azimuth Travel 360°, Continuous
Accuracy, Elevation ±0.05°
Note 1
±0.035°
Note 1
±0.035°
Note 1
±0.15°
Note 1

±0.15°
Note 1

±0.15°
Note 1
±0.15°
Note 1
±0.15°
Note 1
 0.15°
Note 1
El Position Feedback Type Dual Synchro Incremental
Encoder
Incremental
Encoder
Single Synchro Single Synchro Single Synchro Single Synchro Single Synchro Single Synchro
Accuracy, Azimuth ±0.05°
Note 1
±0.035°
Note 1
±0.035°
Note 1
±0.05°
Note 1
±0.05°
Note 1
±0.05°
Note 1
±0.05°
Note 1
±0.05°
Note 1
±0.05°
Note 1
Az Position Feedback Type Dual Synchro Incremental
Encoder
Incremental
Encoder
Dual Synchro Dual Synchro Incremental
Encoder
Dual Synchro Dual Synchro Dual Synchro
Max Rotation Speed, Azimuth 42 deg/min 36 deg/min 36 deg/min 60 deg/min 60 deg/min 60 deg/min 60 deg/min 60 deg/min 36 deg/min
Max Rotation Speed, Elevation 6.5 deg/min 4.2 deg/min 4.2 deg/min 6 deg/min 6 deg/min 6 deg/min 6 deg/min 6 deg/min  6 deg/min
Height (A) 5 in
(12.7 cm)
6.2 in
(15.7 cm)
6.2 in
(15.7 cm)
8 in
(20.3 cm)
10 in
(25.4 cm)
12 in
(30.5 cm)
16.5 in
(41.9 cm)
20 in
(50.8 cm)
40.1 in
(101.9 cm)
Flange Diameter (B) 10 in
(25.4 cm)
15 in
(38.1 cm)
15 in
(38.1 cm)
17.5 in
(44.5 cm)
21 in
(53.3 cm)
26 in
(66.0 cm)
36 in
(91.4 cm)
44 in
(112 cm)
84.0 in
(213.4 cm)
Body Diameter (C) 9 in
(22.9 cm)
13.8 in
(35.1 cm)
13.8 in
(35.1 cm)
16 in
(40.6 cm)
18 in
(55.7 cm)
22 in
(55.9 cm)
32 in
(81.3 cm)
40 in
(102 cm)
78 in
(198.1 cm)
Flange Thickness (D) 1 in
(2.5 cm)
.53 in
(1.3 cm)
.53 in
(1.3 cm)
.63 in
(1.6 cm)
.75 in
(1.9 cm)
.75 in
(1.9 cm)
.75 in
(1.9 cm)
.75 in
(1.9 cm)
.75 in
(1.9 cm)

Note 1 - Higher accuracies available with error correction

All products and their specifications subject to change without noticeRotator sketch web

Related Products

  • MI-710C Family of Integrated Position Controllers
  • MI-830 Family of Pylons
  • MI-3048 RCS Analysis Software