An integrated stepper motor combines the stepper motor, microstepping driver, motion controller, and (in closed-loop variants) an encoder in one factory-aligned housing, eliminating the external stepper drive chassis and most of the multi-conductor cable between them [S1][S8].
Frame sizes span NEMA 8 (20 mm) through NEMA 34 (86 mm) with integrated offerings, supply voltages from 12 VDC up to 70 VDC, and holding torque commonly between 0.15 Nm and 9.3 Nm depending on stack length and frame [S2][S3]. The result is a drop-in motor that accepts step/direction pulses, analog commands, or industrial Ethernet directly on the same cable that carries DC bus power.
Definition and Scope: What Gets Integrated
Four functional blocks sit behind the rear end cap: the two-phase hybrid stepper, a MOSFET or GaN-based H-bridge chopper drive, a position/velocity/torque controller, and, in closed-loop SKUs, a magnetic or optical encoder [S1][S8]. Applied Motion Products' category page lists integrated steppers as a distinct product family from standalone motors and drives, citing space-saving design, reduced wiring, and lower system cost versus separate components [S1].
MOONS' product configurator breaks the integrated family into sub-categories including Integrated Stepper Motors and Integrated Step-Servo Motors, indicating that the term now covers both open-loop and closed-loop architectures under one marketing label [S2]. Stepperonline (OMC) describes the integration as "stepper motor, driver, motion controller and encoder" packaged into a single NEMA-format housing, with pulse-mode and serial-bus variants on the same SKU line [S4][S8].
Spec Envelope: Torque, Voltage, and Frame
Published holding-torque buckets at MOONS' cluster heavily in the 1.5-2.5 Nm range, which lines up with NEMA 23 / 56 mm stack lengths in their integrated line; smaller 0.15-0.7 Nm SKUs cover NEMA 17 [S2]. At the upper end, Nanotec's integrated stepper family reaches a stated 9.3 Nm holding torque in its largest frame, with the same catalog offering smaller NEMA 8, 11, 14, 17, and 23 sizes for lower-load axes [S3].
Supply voltage splits into two practical tiers: 12-48 VDC, which dominates small-frame SKUs, and 12-70 VDC, which is used where higher bus voltage is needed to push torque at high step rates [S2]. The AutomationDirect SureStep DC integrated unit is a concrete reference point: NEMA 17, 68 oz-in (about 0.48 Nm) holding torque, 2 A phase current, 12-48 VDC, IP20, and microstepping programmable from 200 to 51,200 steps per revolution [S7].
Control Modes: Pulse, Analog, and Industrial Ethernet
MOONS' configurator exposes the field options that matter when replacing a separate drive: Pulse Mode is the most common interface (28 SKUs in their published filters), followed by Analog Position/Velocity (12), with EtherNet/IP, Modbus RTU, and Modbus TCP each available on a smaller subset [S2]. This mix is consistent with Applied Motion's positioning of integrated steppers as a "drop-in" replacement for conventional step-and-direction systems, where the drive's command inputs and the host PLC's pulse train are still the dominant machine-builder pattern [S1].
For higher-level control, Nanotec lists EtherCAT, EtherNet/IP, CANopen, Modbus/RTU, Modbus/TCP, and eSCL/SCL across its integrated families, with the same firmware environment (Plug & Drive Studio, NanoLib, NanoJ) used to program both integrated steppers and integrated BLDCs [S3]. The implication is that an engineer who has commissioned a Nanotec integrated BLDC can reuse the same fieldbus mapping, the same I/O objects, and the same scripting toolchain when swapping in a stepper variant.
Selection Criteria: Open-Loop vs Closed-Loop, Bus vs Pulse
Three decision axes cover almost every selection. (1) Open-loop vs closed-loop: an open-loop integrated stepper is the lowest-cost and simplest choice for fixed-load applications such as valve dosing, conveyor indexing, and lab-automation dispensers, where missed steps are acceptable; closed-loop integrated steppers add an encoder and field-oriented current control, which recover from stall events and reduce heat at standstill [S8]. (2) Command interface: pulse/direction or CW/CCW pulses remain the cheapest and most universal interface and match any PLC or microcontroller with a high-speed output; analog or fieldbus interfaces become worthwhile when the host already speaks those protocols or when multiple axes must be coordinated from a single controller [S1][S2]. (3) Mechanical envelope: NEMA 17 integrated steppers (such as the 0.48 Nm, 24 VDC, 1000 PPR closed-loop units at OMC) fit the majority of small-format machines; NEMA 23 and NEMA 24 cover mid-range; NEMA 34 reaches roughly 9 Nm but begins to overlap economically with small AC servos [S3][S4].
For cabinet-space-constrained builds, the integrated format also removes a separate DIN-rail or panel-mount drive, which is a concrete win for OEM skids that ship pre-wired. The same wiring-savings logic shows up across the wider motion-control ecosystem; for instance, relay vs contactor selection also turns on consolidating switching elements, and the integrated stepper is the stepper-world equivalent of that consolidation.
Where Integrated Steppers Fit, and Where They Do Not
Integrated steppers are the right answer for low-to-mid dynamic applications: indexing tables, syringe pumps, peristaltic pump heads, labelers, small CNC tool changers, and AGV wheel modules. For comparison, peristaltic pump cost drivers for low-flow lab and OEM skids are dominated by tubing and tubing life, and the drive choice is normally a small integrated stepper holding a calibrated rpm. [S2]
Integrated steppers are the wrong answer for high-torque, high-velocity axes where a real servo is required for torque density and bandwidth above roughly 3,000 rpm continuous, or for applications that need absolute multiturn feedback from power-on without a homing routine. They also fight the engineer in environments above IP65, since most catalog SKUs are IP20; Nanotec's IP65 stepper family exists as a separate listing rather than as the default integrated SKU [S3].
Limitations, Failure Modes, and Sourcing Reality
Repairability is the first limitation. When the drive section fails inside an integrated stepper, the field-replaceable unit is normally the entire motor, not a driver card; stocking spares therefore means stocking whole motors, which raises working capital for high-fleet users. The second limitation is thermal: an integrated drive in a sealed NEMA-format housing shares the same case as the motor windings, so the continuous current is typically derated versus a separate motor + drive of the same frame. [S5]
On sourcing, the global supply picture still concentrates a large share of integrated stepper production in Chinese factories that also serve the DIY and small-OEM channels; OMC/Stepperonline noted a 2026-10-01 to 2026-10-05 National Day shipping pause at its China warehouse, with resumption on 2026-10-06 [S4]. That calendar is worth flagging for buyers timing Q4 builds, alongside the broader freight environment discussed in container freight rate volatility coverage, which directly affects landed cost for air- or sea-freighted motion-control parts.
Two trackable signals to watch through the rest of 2026: the number of integrated SKUs that add EtherCAT and PROFINET as standard command interfaces (currently dominated by EtherNet/IP, Modbus, and CANopen across the catalogs above [S2][S3]), and the migration of NEMA 17 integrated offerings from open-loop to closed-loop encoder-equipped variants as the price gap narrows. The latter is already visible at the 0.48 Nm, 24 VDC, 1,000 PPR NEMA 17 tier at OMC [S4], which is the price point most likely to flip the default from open-loop to closed-loop over the next 12-18 months.
Detailed specification references: pile driver.