Models & Specifications
| Specifications | STM2033B-485-M-0FS | STM2033B-CANopen-M-0FS | STM2038B-485-M-0FS | STM2038B-CANopen-M-0FS | STM2048B-485-M-0FS | STM2048B-CANopen-M-0FS |
|---|---|---|---|---|---|---|
| Flange Size | 20mm | 20mm | 20mm | 20mm | 20mm | 20mm |
| Brake | No Brake | No Brake | No Brake | No Brake | No Brake | No Brake |
| Encoder type | 17-bit single-turn absolute magnetic encoder | 17-bit single-turn absolute magnetic encoder | 17-bit single-turn absolute magnetic encoderr | 17-bit single-turn absolute magnetic encoderr | 17-bit single-turn absolute magnetic encoder | 17-bit single-turn absolute magnetic encoder |
| Rated Voltage | 24 VDC | 24 VDC | 24 VDC | 24 VDC | 24 VDC | 24 VDC |
| Voltage Range | 12-30VDC | 12-30VDC | 12-30VDC | 12-30VDC | 12-30VDC | 12-30VDC |
| Inertia | 2.9×10⁻⁷ kg·m² | 2.9×10⁻⁷ kg·m² | 3.3×10⁻⁷ kg·m² | 3.3×10⁻⁷ kg·m² | 4×10⁻⁷ kg·m² | 4×10⁻⁷ kg·m² |
| Rated Current | 1.0 A | 1.0 A | 1.0 A | 1.0 A | 1.0 A | 1.0 A |
| Body Length | 48.8 mm | 48.8 mm | 53.7 mm | 53.7 mm | 63.8 mm | 63.8 mm |
| Weight | 0.073 kg | 0.073 kg | 0.083 kg | 0.083 kg | 0.113 kg | 0.113 kg |
* Scroll horizontally within the table area when the content is wide.
Specifications
| Shaft Diameter | Φ4 |
| Number Of Phases | 2 |
| Step Angle | 1.8° |
| Encoder | 17-bit single-turn absolute magnetic encoder (multi-turn absolute counting with automatic storage upon power failure) |
| Control Modes | CiA402 Mode,Manufacturer Mode |
| External Control Interface | DI – Non-isolated PNP Input,DI – Non-isolated Switch Input,DO – Non-isolated MOSFET Output |
| CiA402 Mode | PP, VM, PV, PT, HM, IP, CSP, CSV, CST |
| DI (Digital Input) | Quantity: 3 pieces; The high-speed unidirectional isolated optocoupler supports PWM pulse input and PNP. High level: 5-24 Low level: 0 to 2V；Configurable functions: 1. Enable 2. Positive and negative limits 3. Origin switches 4. Alarm reset 5. Pause 6. Switch between multiple operation instructions |
| DO (Digital Output) | Quantity: 1; Output methods: MOS open-drain output, NPN; The maximum current of the DO load is 100mA and the maximum voltage is 30V；Configurable functions: 1. Regular DO; 2. The motor stops running; 3. Goal achieved; 4. Alarm output |
| AI (Analog Input) | - |
| Operating Temperature | 0°C to 40°C |
| Operating Altitude | <1000m |
| Fault Alarm | Overvoltage, undervoltage, overheat, locked rotor |
| Servo Function | Soft limit, gain switching, S-curve planning, vibration suppression, parameter identification, online upgrade |
Torque-Speed Characteristics
STM2033B-CANopen/485-M-XX
STM2038B-CANopen/485-M-XX
STM2048B-CANopen/485-M-XX
Product Details
Multiple control modes Small size only 20 mm STM20M series integrated stepper servo motor is an ultra-compact size highly integrated stepper motor developed by NiMotion, 17 single-turn absolute encoder, support digital input and output, fault diagnosis, resonance suppression, soft limit and other functions. STM20 series stepper servo motor is highly integrated, which perfectly integrates stepper motor and drive control system. It can be used without external driver, which greatly saves the space occupied by the equipment compared with the traditional motor combination. It supports bus control and pulse control, is simple and convenient to use, and is easier to install and maintain.
Product Features
Fault alarm
Bus Communication
Multiple control modes
Compact only 20mm
Step motor
Servo system
Highly integrated design
Built-in 17-bit high-precision magnetic encoder
Vibration suppression
Integrated Micro Stepper Motor
Ultra-small size, powerful performance
The product is sophisticated and compact, with a base width of only 20mm. Light load, high response, especially suitable for all kinds of compact equipment, such as pipetting workstations, semiconductors, mounting machines and other automation equipment.
Highly integrated design
Integrates Stepper motors, encoders, 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.
High Precision Encoder Feedback
Built-in 17-bit single-cycle absolute 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 12-30 VDC, suitable for various power-supply environments and giving greater flexibility in system integration and retrofitting.
Overall dimensions
Base width: 20mm; "X" represents the body length. Please click the "Downloads" section below to view detailed drawings.
Application of fully automatic microscopes
The integrated motor is applied to the intelligent microscope, and closed-loop control eliminates the errors of "step loss" and mechanical "back clearance" of the traditional stepper motor. The integrated design significantly reduces the equipment size, and the built-in high-precision encoder ensures precise control and ensures the high reliability of experimental data, which is crucial for high-precision quantitative analysis.
Ultra-Compact Size, Powerful Performance
The product features a refined, compact design with a frame width of just 20mm. No external driver is required — it comes with a built-in high-precision 17-bit single-turn absolute encoder and a closed-loop control system that delivers high torque and fast response. This makes it especially suitable for various compact automation equipment such as pipetting workstations, semiconductor manufacturing, and pick-and-place machines.
Downloads
Companion Products
Integrated motor power/communication/IO bus cable.
USB to CAN converter with isolation, IP65 protection, and secondary development SDK support.
USB to RS485 converter with active termination, isolation, IP65 protection, and secondary development SDK support.
FAQ
The positional accuracy of a stepper motor is about 3‑5% of the step angle, and it does not accumulate errors.
Microstepping is essentially an electronic damping technique, primarily designed to reduce or eliminate low‑frequency vibration. Improved positional resolution is a secondary benefit. Different manufacturers’ microstepping drivers can vary greatly in accuracy, and higher microstepping numbers are harder to control precisely.
This is due to the motor’s pull‑in rate – the maximum pulse frequency at which it can start from standstill without losing steps. If the pulse frequency exceeds this rate, the motor cannot start properly and may lose steps or stall. The solution is to use an acceleration ramp: start at a low frequency and gradually increase to the target high frequency. Integrated stepper motors allow you to set acceleration and deceleration parameters freely.
When the motor rotates, the inductance in each phase winding generates a back‑EMF. The higher the frequency, the greater the back‑EMF, which reduces the phase current and thus lowers the torque.
Excessive temperature can demagnetise the magnetic material, reducing torque and causing step loss. The demagnetisation point is generally above 130°C, some up to 200°C. Therefore, a surface temperature of 80‑90°C is perfectly normal for a stepper motor. The most common insulation class is Class B, with a rated operating temperature up to 130°C.
Applications
Discover how this product is applied across various industrial automation scenarios.
Compatible Products
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Technical Resources
Technical guides, application notes, and more to help you get the most out of the product.
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