STM28-MC Integrated Stepper Servo Motor
28mm flange integrated stepper servo motor – delivering closed-loop servo control algorithms within a compact footprint. Offers significantly improved positioning accuracy, low heat generation, and excellent speed stability. Ideal for a wide range of compact automation equipment.
Features
- 28mm flange size
- Built-in absolute magnetic encoder
- CANopen / RS485 / Pulse control
Models & Specifications
| Specifications | STM2832B-485-MC-0FS | STM2832B-CANopen-MC-0FS | STM2851B-485-MC-0FS | STM2851B-CANopen-MC-0FS |
|---|---|---|---|---|
| Flange Size | 28mm | 28mm | 28mm | 28mm |
| 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 encoder | 17-bit single-turn absolute magnetic encoder |
| Rated Voltage | 24 VDC | 24 VDC | 24 VDC | 24 VDC |
| Voltage Range | 12-30VDC | 12-30VDC | 12-30VDC | 12-30VDC |
| Inertia | 9×10^-7 kg·m² | 9×10^-7 kg·m² | 18×10^-7 kg·m² | 18×10^-7 kg·m² |
| Rated Current | 1.0 A | 1.0 A | 1.0 A | 1.0 A |
| Body Length | 47 mm | 47 mm | 65.5 mm | 65.5 mm |
| Weight | 0.15 kg | 0.15 kg | 0.23 kg | 0.23 kg |
* Scroll horizontally within the table area when the content is wide.
Specifications
| Shaft Diameter | Φ5 |
| Number Of Phases | 2 |
| Step Angle | 1.8° |
| Encoder | 17-bit single-turn absolute encoder (multi-turn absolute counting with automatic storage upon power failure) |
| Control Modes | CiA402 Mode,Manufacturer Mode |
| External Control Interface | DI – Non-isolated Switch Input,DO – Non-isolated MOSFET Output,DI – Non-isolated NPN Input |
| CiA402 Mode | PP, VM, PV, PT, HM, IP, CSP, CSV, CST |
| DI (Digital Input) | Quantity: 3; Supports PWM pulse input, maximum pulse frequency 1.2 MHz. Logic 1 signal: 5 - 24; Logic 0 signal: 0 - 2V; Configurable functions: 1. Enable 2. Positive and negative limit 3. Origin switch 4. Alarm reset 5. Pause 6. Multi-segment operation instruction switching |
| DO (Digital Output) | Quantity: 2; Output mode: MOS open-drain output, maximum load current 100mA, maximum voltage 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
STM2832X-CANopen/485-M-XX
STM2851X-CANopen/485-M-XX
Product Details
The STM28MC series of integrated stepping servo motors is a stepper product independently developed by NiMotion. Based on the excellent closed-loop control system and integrated design concept, this product integrates the stepper motor, encoder, driver and digital IO, supports CANopen and RS485 communication bus control, and has the characteristics of compact size and easy wiring.
Product Features
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 encoder (multi-turn absolute counting, automatic storage of power loss) provides real-time position and speed feedback for more accurate closed-loop control; multi-turn absolute counting and automatic position storage on power loss mean no re-homing is needed after power-up.
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.
Complete diagnosis and protection
Comprehensive diagnostics and protection covering over-voltage, under-voltage, over-temperature, stall, overload, over-speed, over-travel and homing timeout, with current and historical alarm records for safer operation.
Overall dimensions
Base width: 28mm; "X" represents the body length. Please click the "Downloads" section below to view detailed drawings.
Full-automatic microscope application
The STM28MC integrated motor is applied to smart microscopes. Closed-loop control eliminates the "step loss" of traditional stepper motors and the error caused by mechanical "backlash." The integrated design greatly saves equipment space. With a built-in high-precision encoder, it provides precise control, ensuring high reliability of experimental data, which is crucial for high-precision quantitative analysis
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
Low‑inertia motors have very low rotor inertia, offering faster acceleration and better dynamic response. High‑inertia motors provide higher torque accuracy, lower speed fluctuation, and smoother operation – they are suitable for applications that prioritise running stability.
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
Build complete and reliable solutions with our compatible products.
Technical Resources
Technical guides, application notes, and more to help you get the most out of the product.
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