Hamilton Sundstrand Company Gas Fuel Metering Valve HFG2.0 User Manual

 

 

monitor winding temperatures. The motor electrical power and thermistor 
wires pass through a conduit into the electronics housing. 

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.  

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. 

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.  

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. 

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. 

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.  

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