STM42

STM42-M Integrated Leadscrew Stepper Motor

Integrated lead screw stepper servo motor with 42mm flange, CANopen/RS485, 2500-line encoder, thrust up to 600N.

Features

"Integrated lead screw
CANopen/RS485
FOC and SVPWM technology
Analog input (0-10V)
Multiple thread leads"

42mm CANopen RS485

Models & Specifications

Specs as rows · Models as columns

Specifications	STM4234B-485-M-1ZB (Lead 1.270mm)	STM4234B-485-M-1ZB (Lead 2.540mm)	STM4234B-485-M-1ZB (Lead 3.175mm)	STM4234B-485-M-1ZB (Lead 12.70mm)	STM4234B-485-M-1ZB (Lead 25.40mm)	STM4248B-485-M-1ZB (Lead 1.270mm)	STM4248B-485-M-1ZB (Lead 2.540mm)	STM4248B-485-M-1ZB (Lead 6.350mm)	STM4248B-485-M-1ZB (Lead 12.70mm)	STM4248B-485-M-1ZB (Lead 25.40mm)	STM4234B-485-M-1ZB (Lead 6.350mm)	STM4234B-CANopen-M-1ZB (Lead 1.270mm)	STM4234B-CANopen-M-1ZB (Lead 2.540mm)	STM4234B-CANopen-M-1ZB (Lead 3.175mm)	STM4234B-CANopen-M-1ZB (Lead 12.70mm)	STM4234B-CANopen-M-1ZB (Lead 25.40mm)	STM4248B-CANopen-M-1ZB (Lead 1.270mm)	STM4248B-CANopen-M-1ZB (Lead 2.540mm)	STM4248B-CANopen-M-1ZB (Lead 6.350mm)	STM4248B-CANopen-M-1ZB (Lead 12.70mm)	STM4248B-CANopen-M-1ZB (Lead 25.40mm)	STM4234B-CANopen-M-1ZB (Lead 6.350mm)
Flange Size	42mm	42mm	42mm	42mm	42mm	42mm	42mm	42mm	42mm	42mm	42mm	42mm	42mm	42mm	42mm	42mm	42mm	42mm	42mm	42mm	42mm	42mm
Body Length	62.5 mm	62.5 mm	62.5 mm	62.5 mm	62.5 mm	66.5 mm	66.5 mm	66.5 mm	66.5 mm	66.5 mm	62.5 mm	62.5 mm	62.5 mm	62.5 mm	62.5 mm	62.5 mm	66.5 mm	66.5 mm	66.5 mm	66.5 mm	66.5 mm	62.5 mm
Encoder typ	2500-line single-turn absolute magnetic encoder	2500-line single-turn absolute magnetic encoder	2500-line single-turn absolute magnetic encoder	2500-line single-turn absolute magnetic encoder	2500-line single-turn absolute magnetic encoder	2500-line single-turn absolute magnetic encoder	2500-line single-turn absolute magnetic encoder	2500-line single-turn absolute magnetic encoder	2500-line single-turn absolute magnetic encoder	2500-line single-turn absolute magnetic encoder	2500-line single-turn absolute magnetic encoder	2500-line single-turn absolute magnetic encoder	2500-line single-turn absolute magnetic encoder	2500-line single-turn absolute magnetic encoder	2500-line single-turn absolute magnetic encoder	2500-line single-turn absolute magnetic encoder	2500-line single-turn absolute magnetic encoder	2500-line single-turn absolute magnetic encoder	2500-line single-turn absolute magnetic encoder	2500-line single-turn absolute magnetic encoder	2500-line single-turn absolute magnetic encoder	2500-line single-turn absolute magnetic encoder
Thrust	300 N·m	210 N·m	180 N·m	50 N·m	40 N·m	450 N·m	300 N·m	155 N·m	70 N·m	55 N·m	100 N·m	300 N·m	210 N·m	180 N·m	50 N·m	40 N·m	450 N·m	300 N·m	155 N·m	70 N·m	55 N·m	100 N·m
Load	150 N	140 N	112 N	28 N	15 N	320 N	210 N	109 N	54 N	29 N	70 N	150 N	140 N	112 N	28 N	15 N	320 N	210 N	109 N	54 N	29 N	70 N
Screw Lead	1.27mm	2.54mm	3.175mm	12.7mm	25.4mm	1.27mm	2.54mm	6.35mm	12.7mm	25.4mm	6.35mm	1.27mm	2.54mm	3.175mm	12.7mm	25.4mm	1.27mm	2.54mm	6.35mm	12.7mm	25.4mm	6.35mm
Step Length @1.8°	0.0064mm	0.0127mm	0.0159mm	0.0635mm	0.127mm	0.0064mm	0.0127mm	0.0318mm	0.0635mm	0.127mm	0.0318mm	0.0064mm	0.0127mm	0.0159mm	0.0635mm	0.127mm	0.0064mm	0.0127mm	0.0318mm	0.0635mm	0.127mm	0.0318mm
Self-locking Force	150 N	100 N	40 N	3 N	0 N	150 N	100 N	15 N	3 N	0 N	15 N	150 N	100 N	40 N	3 N	0 N	150 N	100 N	15 N	3 N	0 N	15 N
Holding Torque	0.25 N·m	0.25 N·m	0.25 N·m	0.25 N·m	0.25 N·m	0.48 N·m	0.48 N·m	0.48 N·m	0.48 N·m	0.48 N·m	0.25 N·m	0.25 N·m	0.25 N·m	0.25 N·m	0.25 N·m	0.25 N·m	0.48 N·m	0.48 N·m	0.48 N·m	0.48 N·m	0.48 N·m	0.25 N·m

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

Specifications

Voltage Range	12-36 VDC
Encoder	2500-line single-turn absolute magnetic encoder
CIA402 Mode	CiA402 (PP, VM, PV, PT, HM, IP, CSP, CSV, CST); NiMotion modes
Drive Mode	Utilizes FOC (Field-Oriented Control) technology and SVPWM
DI (Digital Input)	"Quantity: 3 units; PWM frequency ≤ 200kHz; supports dual-level input of 5V–30V; logic 1 signal: 5V or 24V; logic 0 signal: 0–2V; configurable functions: 1. enable; 2. positive/negative limit; 3. home switch; 4. alarm reset; 5. pause; 6. multi-segment operation command switching."
Control Modes	CiA402 Mode,Manufacturer Mode
External Control Interface	DI – Non-isolated NPN Input,DI – Non-isolated Switch Input,DI – Isolated Opto Single-Ended Input,DI – Isolated Opto Differential Input,DO – Isolated Open-Drain Output,DO – Non-isolated MOSFET Output,AI – 0–10V Analog Input
DO (Digital Output)	Quantity: 2 units, 100mA@30V, e functions: 1. Motor run/stop; 2. Target reached; 3. Alarm 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
Servo Function	Soft limit, gain switching, S-curve planning, vibration suppression, parameter identification, online upgrade

Torque-Speed Characteristics

STM4234B -CANopen/485

STM4248B-CANopen/485

Product Details

Product Overview

STM42M series CANopen&RS485 communication integrated stepper servo screw motor is a high-performance, low-power stepper servo product independently developed by NiMotion. Based on the excellent closed-loop control system and integrated design concept, this product integrates the stepper motor, encoder, screw rod, driver and digital IO, supports CANopen and RS485 communication bus control, and has the characteristics of compact size and simple wiring.

Product Features

Highly integrated design

Integrates Stepper motors, encoders, screws, drives and digital IO into a single compact unit, so no external drive is required. Compared with conventional separated solutions it saves considerable installation space, needs less wiring, and makes commissioning and maintenance easier.

Advanced Drive Algorithm

Adopts FOC (field-oriented control) and SVPWM for smooth torque output, excellent low-speed performance and lower operating noise and vibration.

High Precision Encoder Feedback

Built-in 2500-wire encoder provides real-time position and speed feedback for more accurate closed-loop control, ensuring smoother operation and more accurate positioning.

Multi-bus communication support

Supports CANopen and RS485 communication, allowing quick connection to mainstream PLCs, motion controllers and host systems, with flexible networking and easy expansion.

Standard CiA 402 Sport Mode

Supports CiA 402 standard motion modes (PP, PV, HM, CSP, CSV, etc.) as well as position mode, velocity mode and torque mode, ensuring compatibility with mainstream fieldbus motion-control architectures and making replacement and commissioning easier.

Wide Voltage Input

Wide input voltage range of 12~36VDC, suitable for various power-supply environments and giving greater flexibility in system integration and retrofitting.

Digital Inputs / Outputs

Built-in digital inputs and outputs (DI/DO) that can be configured for enable, forward/reverse limit switches, home sensor, alarm output, brake control and more, allowing direct interfacing with sensors and PLCs without additional I/O modules and simplifying field wiring.

Integrated High-precision Encoder

An integrated high-resolution absolute encoder provides real-time rotor position and speed feedback for full closed-loop control. Multi-turn absolute versions store the position when power is lost, so no re-homing is required after power-up, giving more accurate positioning and smoother low-speed operation.

Homing and Origin Setting

Multiple homing (origin return) modes with configurable homing direction, speed and origin offset, allowing the mechanical origin to be re-established quickly after power loss or an abnormal stop and ensuring repeat positioning accuracy.

Multiple Control Modes

Supports multiple control modes and standard CiA 402 motion modes (PP, PV, HM, CSP, etc.), switchable via fieldbus, pulse train, analog input or digital I/O to suit different host systems.

Gain Switching

Several gain sets can be stored and switched, with online auto-tuning available. Gains can be changed automatically or manually according to load inertia and operating speed, balancing fast response with smooth low-speed operation for quicker commissioning.

16-segment Position / Velocity & S-curve Planning

A built-in 16-segment position and velocity instruction function combined with S-curve acceleration/deceleration planning enables smooth multi-point positioning with reduced start/stop shock and mechanical vibration, improving cycle time and motion smoothness.

Resonance Suppression

Resonance suppression automatically identifies and sets mechanical resonance frequencies and uses notch filtering to suppress mid- and high-frequency resonance, reducing operating noise and improving positioning stability and path accuracy.

Low-frequency Vibration Suppression

Low-frequency vibration suppression compensates the residual sway of long arms, belts and other flexible loads, giving faster settling and more stable positioning in high-speed point-to-point applications.

Downloads

Name	Type	Size	Update Date
NiMotion Integrated Motor Selection Guide	Selection Guide	58.5MB	2026-10-14
STM42M Series Integrated RS485 & CANopen Communication Servo Motor for Lead Screws and Steppers User Manual	User Manual	940.8KB	2026-10-19
Communication Manual – pmm60l/blm/stm-modbus	Communication Manual	4.0MB	2026-08-27
Communication Manual – pmm60l/blm/stm-CANopen	Communication Manual	3.8MB	2026-08-27
stm42xxb-m-1zbg-integrated-lead-screw-stepper-servo-motor	Drawing	160.6KB	2026-07-28
Motor Tuning Software – General Purpose	Software	84.5MB	2026-08-27

Companion Products

Power CableSTX001 Power Cable

Power cable for NiMotion integrated motors.

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Communication CableSTX002A/B Communication Cable

Communication cable for NiMotion integrated motors.

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Communication ConverterSCM-USBCANI-L

USB to CAN converter with isolation, IP65 protection, and secondary development SDK support.

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Communication ConverterSCM-USB485A-L

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

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I/O CableSTX003 IO Cable

IO cable for NiMotion integrated motors.

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Communication CableVDCX010P Communication Cable

Communication cable for NiMotion integrated motors.

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Communication CableSDCX001-KZ-B Communication Cable

Communication cable for NiMotion integrated motors.

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Applications

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With the rapid development of logistics and manufacturing industries, sorting machines are being used more and more widely. As a common sorting equipment, the pendulum wheel sorter is highly efficient, accurate, and flexible, and is widely used in various logistics sorting scenarios. The application of integrated servo motors in the pendulum wheel sorter provides new possibilities for performance improvement and optimization of the sorter.

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Application of integrated servo motor in extracorporeal vibrating lithotripsy bed

With the continuous advancement of medical technology, the extracorporeal vibrating lithotripsy bed, as a non-invasive stone treatment device, has been widely used in the medical field. The integrated servo motor, as the core driving component of the extracorporeal vibrating lithotripsy bed, provides safer and more reliable technical support for the treatment of stone patients with its high efficiency, stability and precision.

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Application of integrated servo motor in venous center robotic arm

With the continuous advancement of medical technology, robot-assisted surgery has become an important development direction in the field of modern medicine. Among them, the venous center robot arm, as a key component of the surgical robot, plays a vital role in the accuracy, stability and safety of the operation. As one of the core components of the robot arm, the integrated servo motor is also gaining more and more attention in the application of the venous center robot arm.

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Application of integrated servo motor in AGV

Automation technology has leapt forward, and the popularity of automatic guided vehicles (AGVs) in logistics, warehousing and production has accelerated. As a key equipment in intelligent logistics, AGVs use electrical control, sensing and navigation technologies to achieve automatic handling and precise positioning of goods. The integrated servo motor, as its power heart, is crucial to the performance of AGVs.

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Application of integrated servo motor in tension system equipment

With the rapid development of industrial automation, the demand for high-precision and high-efficiency transmission and control equipment is growing. As an intelligent motor integrating drive, control and feedback, the integrated servo motor has been widely used in various industrial equipment due to its excellent performance. Especially in tensile test equipment, the integrated servo motor plays a vital role.

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Application cases of integrated stepper servo motors in fluid equipment in the spraying industry

The application of integrated stepper servo motors has achieved precision and efficiency in the spraying process. The combination of CANopen communication and intelligent control algorithms has solved the pain points of traditional spraying equipment, such as large flow fluctuations and delayed response, and significantly improved coating quality and production efficiency.

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Application of integrated stepping servo motor in microscope stage

Microscopes are indispensable tools in scientific research and medical diagnosis, and their accuracy and stability are crucial to the observation results. The stage, as an important part of the microscope, carries the sample to be observed, and its movement accuracy and response speed directly affect the observation effect.

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Application and optimization of integrated servo motors in appearance inspection equipment

This article aims to introduce the application scenarios, technical features, challenges and solutions of integrated servo motors (PMMP4010B-CANpen) in appearance inspection equipment. Through actual case analysis, the key role of motors in improving the accuracy and stability of inspection equipment is demonstrated.

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Application of integrated servo motor in intelligent (automatic) charging equipment

With the widespread promotion and popularization of new energy vehicles, the demand for charging equipment is also growing. In order to improve the efficiency and performance of charging equipment, integrated servo motor technology is widely used in new energy vehicle charging equipment. Integrated servo motor technology combines the functions of motor, controller, sensor, etc., with the advantages of high efficiency, precision and intelligence, bringing revolutionary changes to the charging equ

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