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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.
Resolver Assembly
A brushless, non-contacting resolver is the primary HFG2.0 feedback
sensor. Resolver excitation is achieved via a sinusoidal signal from the
MCE. The resolver provides two sinusoidal feedback signals back to the
MCE. The resolver assembly includes a stator and rotor. See Figure 2-2.
Resolver Stator
The resolver stator is clamped to the main housing between the main
bearing retaining nut and resolver retainer. The angular position of the
resolver stator relative to the resolver rotor is adjustable. Electrical wires
from the resolver are reeled in the resolver adapter to allow rotation. The
resolver wires, along with the motor and thermistor leads, pass through a
conduit into the electronics housing.
Resolver Rotor
The resolver rotor is mounted to the ball screw shaft by a key. As the rotor
rotates, the stator transformer output signals provide shaft rotation
information to the MCE.
Linear Drive Mechanism
The Linear Drive Mechanism converts the rotary motion of the Motor
Assembly to linear actuator motion. The core of the mechanical drive
system is the linear ball screw drive containing a screw shaft, ball-
bearing-fitted nut, extension rod and main duplex thrust bearings. See
Figure 2-2.
Screw Shaft
The thrust bearings, motor rotor, motor end bearing, and resolver rotor
are mounted directly to the screw shaft. A ball-bearing track is machined
into the screw shaft.
Ball Nut
As the screw shaft rotates, the ball nut translates the rotary motion into
linear motion along the shaft axis. The direction of movement along the
shaft axis is determined by direction of rotation.
CH. 2: UNDERSTANDING THE HFG2.0 31