Hamilton Sundstrand Company ACT2000 - Manual (Page 31)

Note: The MCE analog and discrete signal interfaces are
electrically isolated. The serial communication interface is
optically isolated
2.3 Mechanical Description
The ACT2000 consists of four main assemblies:
• Main Housing Assembly
• Brushless DC Motor Assembly
• Resolver
Assembly
• Linear Drive Mechanism
Main Housing Assembly
The main housing assembly consists of the main housing, motor cover,
extension-rod bearing, and associated seals. See Figures 2-2 and 2-3.
The main housing assembly is the primary structural system component
and supports all the bearings, motor cover, mountings, and connectors. It
also provides explosion-proof containment.
The housing is fitted with a stainless steel liner to provide thermal and
dimensional stability for the main bearing. This liner is permanently
installed into the aluminum main housing. A retaining ring is included for
redundant retention.
The main housing also contains rigid mechanical stops to prevent
extension rod travel beyond the design specification.
Brushless DC Motor Assembly
A brushless DC motor powers the ACT2000 linear drive mechanism. The
DC motor consists of a stator and rotor. See Figures 2-2 and 2-3.
Motor Stator
The motor stator is attached to the main housing by a pre-loaded wave
spring and screws. Thermistors are embedded in the stator windings to
monitor winding temperatures. The motor electrical power and thermistor
wires pass through a conduit into the electronics housing.
Motor Rotor
The motor rotor is locked to the ball screw shaft via a straight key. The
motor rotor contains powerful magnets that align with the energized stator
windings, thereby creating torque and shaft rotation.
CH. 2: UNDERSTANDING THE ACT2000 25