FS90-FB - 6V 1.5kg.cm 180deg POM Plastic Case Iron-Core Servo Motor

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Datasheet

FS90-FB Compact Analog Servo With 1.5 kgcm Torque, 180deg Travel and Direct Position Feedback

The FS90-FB is a compact analog micro servo designed for robotics, RC systems, educational projects, embedded motion control, and applications that require both standard servo positioning and direct position feedback. At 6V, it delivers up to 1.5 kg.cm stall torque with

a no-load speed of 0.065 sec/60deg. Its 180deg operating range is controlled using a standard PWM signal from 500-2500us, making it compatible with common microcontrollers and RC servo controllers.

Unlike a conventional 3-wire servo, the FS90-FB provides an additional feedback connection linked to the internal position potentiometer. This allows a host controller to monitor the approximate output position independently of the PWM command, enabling applications such as motion verification, obstruction detection, telemetry, and higher-level closed-loop control. The servo combines a lightweight PC case, plastic gear train, core motor, 21T output spline, and compact 10.7 g construction for space-constrained systems.

Key Features

• 1.5 kg.cm Stall Torque at 6V: Provides useful torque for lightweight robotic mechanisms and RC applications.
• 1.3 kg.cm Stall Torque at 4.8V: Supports operation at standard 4.8V servo supply levels.
• 180deg Position Control: Provides controlled angular movement across a 180deg operating range.
• Position Feedback Output: Exposes the internal potentiometer signal for direct monitoring of servo position.
• Standard PWM Control: Uses pulse-width control for integration with common servo controllers and microcontrollers.
• 500-2500us Pulse Range: Provides the specified command range for full 180deg movement.
• 1500us Neutral Position: Uses a standard centre pulse for convenient control.
• 0.065 sec/60deg At 6V: Provides fast no-load movement for compact robotic applications.
• 0.08 sec/60deg at 4.8V: Maintains responsive movement at the lower operating voltage.
• Analog Control Electronics: Uses an analog comparator amplifier for conventional servo operation.
• Plastic Gear Train: Provides lightweight mechanical transmission for low-load applications.
• Core Motor: Uses a compact brushed core motor suitable for micro-servo operation.
• PC Case: Lightweight polycarbonate housing supports compact installations.
• 21T Output Spline: Uses a 21-tooth output spline with approximately 4.86 mm diameter.
• POM Servo Horn: Includes a plastic POM output horn for compatible mechanical linkage.
• Compact Construction: Measures approximately 22.5 x 12.1 x 26.7 mm for space-constrained designs.
• Lightweight 10.7 g Design: Suitable for small robots, RC models, and portable mechanisms.
• 8us Dead Band: Provides the specified analog control dead-band width.
• Additional Feedback Wire: Enables monitoring without changing normal PWM servo operation.

Applications

• Small robotic arms
• Educational robotics
• RC models
• Pan-and-tilt mechanisms
• Camera positioning
• Sensor positioning
• Embedded motion-control projects
• Position-feedback experiments
• Obstruction detection
• Closed-loop robotics research
• Arduino projects
• ESP32 projects
• Raspberry Pi robotics
• Small automation mechanisms
• Maker projects
• Lightweight actuators