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A relatively small, lightweight valve actuator assembly that can withstand relatively high levels of vibration and shock includes a motor, a position sensor, and a drive belt mounted on an actuator housing assembly. The position sensor is preferably disposed within a sensor housing that is mounted o

A relatively small, lightweight valve actuator assembly that can withstand relatively high levels of vibration and shock includes a motor, a position sensor, and a drive belt mounted on an actuator housing assembly. The position sensor is preferably disposed within a sensor housing that is mounted on a side of the actuator housing assembly. As a result, the overall center-of-gravity (CG) and weight of the actuator assembly is significantly reduced, as is the overall size envelope.

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We claim: 1. A valve actuator assembly, comprising: an actuator housing assembly; a motor mounted in the actuator housing assembly, the motor adapted to receive valve position command signals and configured, upon receipt thereof, to supply a drive force; a position sensor rotationally mounted in th

We claim: 1. A valve actuator assembly, comprising: an actuator housing assembly; a motor mounted in the actuator housing assembly, the motor adapted to receive valve position command signals and configured, upon receipt thereof, to supply a drive force; a position sensor rotationally mounted in the actuator housing assembly and operable to supply a position signal that is at least representative of a rotational position of the motor; a drive belt coupled between the motor and the position sensor and configured to couple the drive force to the position sensor, the drive belt including indicia thereon that is representative of the rotational position of the motor; and a viewing port disposed on the actuator housing assembly and positioned to provide visual inspection of at least a portion of the indicia on the drive. 2. The valve actuator assembly of claim 1, further comprising: an actuator output shaft rotationally mounted within the actuator housing assembly, the actuator output shaft coupled to receive the rotational drive force from the motor and configured, upon receipt thereof, to rotate to a rotational position. 3. The valve actuator assembly of claim 2, further comprising: a gear train coupled between the motor and the actuator output shaft, the gear train configured to receive the rotational drive force supplied by the motor and transfer the rotational drive force to the actuator output shaft. 4. The valve actuator assembly of claim 3, wherein the gear train is configured as a step-down gear train. 5. The valve actuator assembly of claim 2, wherein: the drive belt is coupled between the actuator output shaft and the position sensor; and the position signal is at least representative of the rotational position of the actuator output shaft. 6. The valve actuator assembly of claim 2, wherein the drive train comprises: a pulley rotationally mounted on the actuator assembly housing and coupled between the position sensor and the drive belt, whereby the position sensor rotates in response to actuator output shaft rotation. 7. The valve actuator assembly of claim 1, wherein the motor comprises a brushless DC motor. 8. The valve actuator assembly of claim 1, wherein the position sensor comprises a resolver. 9. The valve actuator assembly of claim 1, further comprising: an indicator coupled to the position sensor and extending at least partially from the actuator housing assembly, the indicator including indicia thereon that is representative of the rotational position of the motor. 10. A valve actuator assembly, comprising: an actuator housing assembly; a motor mounted in the actuator housing assembly, the motor adapted to receive valve position command signals and configured, upon receipt thereof, to supply a drive force; an actuator output shaft rotationally mounted in the actuator housing assembly, the actuator output shaft coupled to receive the rotational drive force from the motor and configured, upon receipt thereof, to rotate to a rotational position; a position sensor rotationally mounted in the actuator housing assembly and operable to supply a position signal that is at least representative of the rotational position of the actuator output shaft; a drive belt coupled between the actuator output shaft and the position sensor and configured to couple the drive force to the position sensor, the drive belt including indicia thereon that is representative of the rotational position of the actuator output shaft; and a viewing port disposed on the actuator housing assembly and positioned to provide visual inspection of at least a portion of the indicia on the drive. 11. The valve actuator assembly of claim 10, further comprising: a step-down gear train coupled between the motor and the actuator output shaft, the gear train configured to receive the rotational drive force supplied by the motor and transfer the rotational drive force to the actuator output shaft. 12. The valve actuator assembly of claim 10, further comprising: a pulley rotationally mounted on the actuator assembly housing and coupled between the position sensor and the drive belt, whereby the position sensor rotates in response to actuator output shaft rotation. 13. The valve actuator assembly of claim 10, wherein the motor comprises a brushless DC motor. 14. The valve actuator assembly of claim 10, wherein the position sensor comprises a resolver. 15. The valve actuator assembly of claim 10, further comprising: an indicator coupled to the position sensor and extending at least partially from the actuator housing assembly, the indicator including indicia thereon that is representative of the rotational position of the motor. 16. A valve actuator assembly, comprising: an actuator housing assembly having a motor end, an output end, and one or more sidewalls therebetween; a motor mounted in the actuator housing assembly proximate the motor end, the motor adapted to receive valve position command signals and configured, upon receipt thereof, to supply a drive force; an actuator output shaft rotationally mounted in the actuator housing assembly and extending at least partially from the output end, the actuator output shaft coupled to receive the rotational drive force from the motor and configured, upon receipt thereof, to rotate to a rotational position; a position sensor rotationally mounted in the actuator housing assembly proximate one of the sidewalls thereof, the position sensor operable to supply a position signal that is at least representative of the rotational position of the actuator output shaft; a pulley rotationally mounted on the actuator assembly housing and coupled to the position sensor; a drive belt coupled between the actuator output shaft and the pulley, the drive belt configured to translate rotation of the actuator output shaft into rotation of the pulley and including indicia thereon that is representative of the rotational position of the actuator output shaft; and a viewing port disposed on the actuator housing assembly and positioned to provide visual inspection of at least a portion of the indicia on the drive. 17. The valve actuator assembly of claim 16 further comprising: a step-down gear train coupled between the motor and the actuator output shaft, the gear train configured to receive the rotational drive force supplied by the motor and transfer the rotational drive force to the actuator output shaft.