Moog Gimbal Control Electronics (GCE)

The high-reliability Gimbal Control Electronics System controls the motion of two

or more motors, such as used in solar array actuators and antenna gimbals.

FEATURES

• Use pulsed discretes to turn on active side

• Spacecraft Interface via dual redundant Mil-STD-1553B buses

• Uses +5 V and ±15 V DC/DC Converters with separate EMI Filter

• Motor drive has micro-stepping capabilities

• Motor uses half Bridge driver and QuadPower Mosfet to drive the motor

• Provides 8 Iset power points for each motor

• Provides Encoder LED bias current selectable 20 mA or 35 mA

• Provides SOH Monitoring circuit, 12 bit ADC (internal  voltages and motor current)

• Provides 1 mA constant current for PRTs and Thermistors (8)

GIMBAL CONTROL ELECTRONICS

MASS, POWER, DIMENSIONS

• 3.8 kg

• 24 to 35V Input

• 12 W Nominal per active side (excluding motor current)

• 190 mm x 158 mm x 118 mm

• -10°C to +40°C Operational Temperature

• -20°C to +50°C Qualification Temperature

RELIABILITY FEATURES

• All Parts SEL Immune

• 100% Dual Redundant

• The GCE contains primary and redundant incremental encoder interface circuits

• The GCE contains two primary and two redundant 3 phase motor  drive outputs.

• >15 kRad Standard (100 kRad Option)

• Conduction Cooled Design

• All Parts MIL-883B

OPTIONS

• Single String Version

• RS-422. RD-485. or LVDS interface

• Custom Command & Telemetry ICD

• >2 Motor Versions

• Custom Form Factor

The Moog Broad Reach Gimbal Control Electronics (GCE) system controls and

drives two types of dual axis redundant actuators. The system contains two

primary and two redundant motor drive outputs. These motor drive outputs

control and drive small, three phase Wye, six state, and permanent-magnet

actuators. The GCE contains two primary and redundant incremental encoder

interface circuits. The GCE communicates with the spacecraft via a dual redundant

MIL-STD-1553B bus. The spacecraft provides the 31VDC nominal voltage and

the side enable pulsed discretes. The GCE assembly consists of two identical

Controllers circuit boards, two identical Motor Driver circuit boards, two identical

DC to DC converters boards, two Backplane boards and the chassis.

The GCE implements programmable micro-stepping to reduce jitter in increments

of 1.2.4.8.16.32 or 64 micro steps/cardinal-steps. Current in all phases driven as a

sinusoid for smooth movement. Optical encoder feedback is provided but not

required to command motor movements. Positional feedback, detection of skipped

steps, and state of health (SOH) current for each motor along with 8 variable

power settings per motor are implemented.