Spacecraft Mechanisms

Enhanced Pointing Gimbal Assembly

In order to accommodate a wide variation of customer requirements, we have successfully qualified two variations of the Enhanced Pointing Gimbal Assembly (EPGA). The EPGA itself is specifically designed for applications requiring the following:

High torque
High stiffness
Load carrying capability
Small increment output step size

Specifications
	3-Phase Motor Configuration	4-Phase Motor Configuration
Motor Step Angle (Degree)	1	1.5
Gear Transmission Ratio	500	500
Output Step Angle (Degree)	0.002	0.003
Nominal Running Torque (lb-in)	950	400
Unpowered Holding Torque (lb-in)	520	410
Nominal Torsional Stiffness (lb-in/rad)	200,000	200,000
Nominal Moment Stiffness (lb-in/rad)	1,000,000	1,000,000
Operating Temperature Range C	-45 to +95	-20 to +95
Volume (inches)	5.8 x 6.57 x 11.93
Mass (pounds)	>13.5
Power Consumption (watts)	>10	>14
Electrical Redundancy	Yes	Yes