0.24Nm(33.99oz.in) NEMA 11 Integrated Closed Loop Stepper Servo Motor – Compact Integrated Stepper with Built-in Driver 63mm Shaft Length

Overview

The NEMA 11 Integrated Closed Loop Stepper Servo Motor combines a stepper motor and driver controller into one compact unit. It delivers precise position control and stability even under varying loads. With its integrated servo control system, it avoids step loss and resonance problems common in open-loop stepper motors.

Key Features

• Step angle: 1.8° for smooth and accurate positioning
• Phase voltage: 2.8V DC | Current: 1.0A | Torque: 0.24 N·m
• Integrated driver with closed-loop control feedback
• Encoder resolution: 1000 pulses (5V differential signal)
• Use voltage range: DC 12–24V
• Compact body size: 28×28×63mm (NEMA 11 standard)

Advantages of Integrated Closed Loop Design

This integrated stepper motor merges the motor, encoder, and closed loop driver into a single body, minimizing wiring complexity and improving efficiency. Compared with open-loop stepper systems, it offers better torque utilization, quiet operation, and automatic position correction when load changes occur.

Applications

Perfect for robotics, laboratory equipment, camera systems, 3D printers, medical devices, and other automation fields that require compact yet reliable motion solutions.

Technical Specifications

Step Angle	1.8°
Phase	2
Voltage	2.8V DC
Current	1.0A
Static Torque	0.24 N·m
Encoder	1000 pulses/rev differential
Insulation Class	B
Operating Voltage	12–24V DC

Magnetic Encoder Wiring Diagram

Serial No	Wire Color	Definition	Description
1	Red	V+	Power supply +5V
2	Black	V−	Power supply GND
3	Green	PUL+	Pulse signal positive
4	Yellow	PUL−	Pulse signal negative
5	Orange	DIR+	Direction signal positive
6	White	DIR−	Direction signal negative
7	Blue	EN+	Enable signal positive
8	Brown	EN−	Enable signal negative
9	Ash	ALM+	Alarm output positive
10	Pink	ALM−	Alarm output negative
11	Ask	EA+	Encoder A+ differential output
12	Ex	EA−	Encoder A− differential output

Model Selection

Model	Phase Current (A)	Phase Resistance (Ω)	Phase Inductance (mH)	Static Moment (N·m)	Total Length (mm)
OK28JC31EC-YT	1.0	1.5	3.1	0.08	31
OK28JC40EC-YT	1.0	2.0	3.5	0.12	40
OK28JC52EC-YT	1.2	2.5	4.8	0.24	52
OK28JC63EC-YT	1.2	2.8	5.2	0.40	63

LED Codes and Error Indicators

LED Display	Status	Description
Green light always on	Normal	Motor is operating
Green light flashing	Standby	Motor stop
One red and one green	Error	Driver overcurrent
Two red and one green	Error	Motor winding open circuit
Three red and one green	Error	Driver input overvoltage
Four red and one green	Error	Driver input undervoltage
Five red and one green	Error	Position deviation
Six red and one green	Error	Encoder signal detection error

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FAQ – Open Loop vs Closed Loop

What is an Open Loop System?

An open-loop stepper motor operates without feedback. The driver sends pulses to move the motor a certain number of steps, but it doesn’t verify the actual position. If the motor is overloaded, it may lose steps.

What is a Closed Loop System?

A closed-loop control system includes an encoder that continuously monitors the motor position and adjusts the output in real time. This eliminates step loss and provides higher torque efficiency.

Open Loop vs Closed Loop

Compared to open loop, closed loop stepper motors operate more smoothly, with better torque, lower noise, and real-time feedback correction, making them ideal for precision applications.

More question, please go ahead to SSS-Motors FAQ Page and Blog Page.