Hiwonder HPS-4518SG 45kg Coreless Waterproof PWM Servo The HPS-4518SG is a high-torque positional digital servo for robot mechanisms, RC vehicles, boats, aircraft models, and demanding DIY motion projects. It combines a coreless motor, stainless-steel gear train, aluminum-alloy center case, and a 180° PWM command range in a compact 60 g package. Key Features High torque output: rated stall torque is 35 kgf·cm at 5V and 45 kgf·cm at 7.4V. Coreless motor drive: designed for responsive high-torque actuation, with a specified speed of 0.13 sec/60° at 7.4V. Stainless-steel gears: a durable metal gear train for higher-load motion assemblies. IP66 protection: sealed construction for dust protection and exposure to powerful water jets; it is not intended for underwater use. 180° PWM positioning: command 0–180° using 500–2500 µs PWM pulses. Aluminum-alloy center case: supports heat dissipation in compact robotic and RC installations. Technical Specifications Model HPS-4518SG Operating voltage 5–8.4V Motor Coreless motor Control method PWM pulse-width control Position range 0–180° PWM range 500–2500 µs Speed 0.13 sec/60° at 7.4V Stall torque 35 kgf·cm at 5V; 45 kgf·cm at 7.4V Stall current 3.5–5.8A Standby current 5 mA Control accuracy 2 µs Gear type Stainless steel Gear ratio 342 (manufacturer specification) Protection IP66 Dimensions 40 × 20 × 40.5 mm Weight 60 g Lead wire 300 mm Package Contents 1 × HPS-4518SG servo Output horns, including metal and plastic styles shown Mounting hardware set shown in the product image Frequently Asked Questions Is this a continuous-rotation servo? No. It is a positional PWM servo with a specified 0–180° command range. The shaft can be turned through 360° when unpowered, but that does not make it a continuous-rotation servo. Can I power it from a 5V supply? Yes. The specified operating range is 5–8.4V. Torque is specified as 35 kgf·cm at 5V and 45 kgf·cm at 7.4V. Use a regulated supply that can safely provide the servo's required current. Is IP66 suitable for underwater operation? No. IP66 is intended for dust protection and powerful water jets. It is not a submersion rating. Can it be driven from a microcontroller? Yes, through a compatible PWM signal. Power the servo from an appropriate external supply rather than a microcontroller logic rail, and connect grounds together for signal reference.
