The geometric attributes of a worm gear system wield substantial influence over the overall efficiency of a Helical Worm Gear Motor. A comprehensive understanding of these parameters is paramount for enhancing the performance of such mechanical systems.

1. Helix Angle: The helix angle represents the angular relationship between the tooth surface of the worm and the axis of the worm gear. A larger helix angle is instrumental in augmenting efficiency by expanding the contact region between the worm and gear teeth. This expanded contact area promotes superior load distribution, mitigates stress concentration, and significantly diminishes power loss due to friction. Consequently, this configuration leads to an optimized torque transmission and minimizes energy dissipation.

2. Tooth Profile: The geometry of the worm gear teeth is a critical determinant of operational efficiency. Implementing a curved or helical tooth profile substantially diminishes sliding friction between the meshing teeth. This feature contributes to a substantial reduction in power loss, a notable reduction in noise and vibration, and, most importantly, an elevation in efficiency by curtailing energy wastage.

3. Number of Start Threads: The number of start threads, a count of the thread starts on the worm, is a crucial factor influencing performance. A greater number of start threads significantly bolsters the load-carrying capacity, concurrently reducing friction and sliding between the teeth. This results in a notable efficiency enhancement.

4. Pressure Angle: The pressure angle, indicating the angle between the line perpendicular to the tooth profile at the point of contact and the tangent line to the pitch circle, plays a pivotal role in reducing sliding friction. A larger pressure angle ensures a smoother and more uniform power transmission, thereby improving efficiency.

5. Lubrication and Surface Finish: The efficacy of lubrication and the quality of surface finish are non-negotiable factors impacting efficiency. Proper lubrication mitigates frictional losses and wear, ensuring a seamless meshing process between the worm and gear teeth. Moreover, a premium surface finish reduces friction and augments the contact quality between the mating surfaces, invariably leading to an appreciable boost in efficiency.

In conclusion, meticulous optimization of these geometric parameters and surface characteristics holds the key to realizing a significant improvement in the operational efficiency of a Helical Worm Gear Motor.