STM57

STM57AI Integrated Analog Input Stepper Motor

57mm flange integrated stepper motor – seamlessly combines stepper motor, driver, controller, and I/O interfaces into a single unit. Reduces wiring, lowers failure points, ensures stable motion, and is suitable for a wide range of small to medium automation equipment.

Features

Pulse/RS485 bus control
Closed-loop control with 14-bit encoder
Supports AI Analog Control

RS485 Pulse 57mm

Models & Specifications

Specs as rows · Models as columns

Specifications	STM5741A-485-AI-0FS	STM5756A-485-AI-0FS	STM5776A-485-AI-0FS	STM57B5A-485-AI-0FS
Flange Size	57mm	57mm	57mm	57mm
Holding Torque	0.55 N·m	1.26 N·m	1.80 N·m	3.0 N·m
Brake	No Brake	No Brake	No Brake	No Brake
Open-Loop/Closed-Loop	Closed-loop	Closed-loop	Closed-loop	Closed-loop
Encoder Type	14-bit single-turn absolute magnetic encoder	14-bit single-turn absolute magnetic encoder	14-bit single-turn absolute magnetic encoder	14-bit single-turn absolute magnetic encoder
Rated Voltage	24 VDC	24 VDC	24 VDC	24 VDC
Voltage Range	12-36VDC	12-36VDC	12-36VDC	12-36VDC
Rated Current	2.8 A	2.8 A	2.8 A	2.8 A
Inertia	1.2×10^-5 kg·m²	3.0×10^-5 kg·m²	4.8×10^-5 kg·m²	8.0×10^-5 kg·m²
Body Length	61 mm	76 mm	96 mm	132 mm
Weight	0.49 kg	0.71 kg	1.05 kg	1.67 kg

* Scroll horizontally within the table area when the content is wide.

Specifications

Shaft Diameter	Φ8
Number Of Phases	2
Step Angle	1.8°
Encoder Introduction	14-bit absolute magnetic encoder
Subdivision	Configurable via DIP switch
Control Modes	Manufacturer Mode,Position Mode,Velocity Mode,Homing Mode
External Control Interface	DI – Non-isolated NPN Input,DI – Non-isolated PNP Input,DI – Non-isolated Switch Input,DO – Isolated Open-Drain Output,DO – Non-isolated MOSFET Output,AI – 0–10V Analog Input
CiA402 Mode	-
DI (Digital Input)	Quantity: 3; High speed isolation; Compatible with source and drain type, with high-speed bidirectional optocoupler; Support PNP, NPN Level duration is better than 1us; Function: Used as pulse input channel
DO (Digital Output)	Quantity: 1; High speed isolation; Open leakage output; Allowable range of external voltage: 15~30VDC; Single channel output current: less than 150mA; Output response time: minimum 3us Configurable functions: 1. The goal has been reached. 2. Alarm output (When the motor status meets the above conditions, the DO switch quantity status changes)
DX (Digital Input / Output)	-
AI (Analog Input)	Quantity: 1; Input method: single-ended input; Signal type: voltage signal; Resolution: 12-bit; Voltage: 0~10V; Accuracy: reference error ≤1%; Configurable functions: dead zone, filtering, offset, scaling, direction.
Operating Temperature	0°C to 40°C
Operating Altitude	<1000m
Fault Alarm	Overvoltage, undervoltage, overtemperature, locked rotor, storage fault, over-limit

Downloads

Name	Type	Size	Update Date
NiMotion Integrated Motor Selection Guide	Selection Guide	12.8MB	2026-08-25
stm57ai-series-analog-control-User Manual	User Manual	6.6MB	2026-08-17
Communication Manual – Stepper-Modbus	Communication Manual	1.1MB	2026-08-25
Motor Tuning Software – Stepper 485 Communication	Software	22.8MB	2026-08-27
stm57xxa-xxx-ai-0fs-integrated-stepper-motor	Drawing	324.9KB	2026-07-28

Companion Products

Power CableSTX001 Power Cable

Power cable for NiMotion integrated motors.

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USB to RS485 converter with active termination, isolation, IP65 protection, and secondary development SDK support.

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IO cable for NiMotion integrated motors.

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Applications

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Application of integrated servo motor in AGV

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Application of integrated servo motor in tension system equipment

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