Home > Nema 23 Closed Loop Stepper Motor

57mm Series (NEMA 23) — Closed Loop Stepper Motor

General Specifications

Item	Specifications
Step Angle Accuracy	±5%
Resistance Accuracy	±10%
Inductance Accuracy	±20%
Encoder	1000-line incremental
Temperature Rise	80°C Max.
Ambient Temperature	-20°C ~ +50°C
Insulation Resistance	100MΩ Min. 500VDC
Dielectric Strength	500V AC 1 minute
Allowable Radial Load	0.02mm Max. (450g load)
Allowable Thrust Load	0.08mm Max. (450g load)

Get a Quick Quote DOWNLOAD

introduction

Model	Step Angle (°)	Length (mm)	Voltage (V)	Current (A/phase)	Holding Torque (N・m)	Encoder (line)	Rotor Inertia (g・cm²)	Leads	Weight (kg)
57BYG250-41-CL	1.8	40	2.4	4	0.5	1000	120	4+ENC	0.5
57BYG250-56-CL	1.8	54	3	4	1.2	1000	280	4+ENC	0.7
57BYG250-76-CL	1.8	76	2.1	4	2	1000	480	4+ENC	1
57BYG250-84-CL	1.8	83	2.28	4	2.2	1000	530	4+ENC	1.4
57BYG250-102-CL	1.8	102	2	4	2.4	1000	700	4+ENC	1.4
57BYG250-112-CL	1.8	112	2.6	4	2.7	1000	800	4+ENC	1.4

*These are representative models. We can manufacture products according to customer's requirements.

FAQs

What is a closed loop NEMA 23 stepper motor?

A closed loop NEMA 23 stepper motor is a 57mm hybrid stepper with an encoder fitted to the rear shaft. The encoder reports rotor position to a closed loop stepper driver, which corrects any following error in real time — so the motor never loses steps, even under varying load. This closed loop stepper motor NEMA 23 build runs at a 1.8° step angle (200 steps per revolution) like an open-loop stepper, but with the reliability of feedback.

How is a closed loop NEMA 23 different from an open loop one?

An open-loop NEMA 23 runs without feedback: it follows step pulses and can lose position if overloaded. A closed loop NEMA 23 adds a 1000-line encoder and a closed loop driver, so the system always knows the true rotor position and corrects for it. The result is no lost steps, lower heating (current is only as high as the load needs), and a position-error alarm output.

What is the holding torque, step angle, and encoder of your closed loop NEMA 23?

Our closed loop 57BYG250 range runs a 1.8° step angle with a 1000-line incremental encoder. Holding torque runs from about 0.55 N·m on the 41mm body up to 3.0 N·m on the 112mm body, with rated current 2.0–4.2 A/phase. Full specs are in the table and the downloadable datasheet.

What driver does a closed loop NEMA 23 need?

A closed loop NEMA 23 needs a closed loop stepper driver — one that reads the encoder and closes the position loop. It won't get the benefit on a plain open-loop driver. We supply a matched closed loop driver set up for the motor, so the encoder, current, and alarm threshold are configured before shipping.

Closed loop stepper or servo — which should I choose?

A closed loop stepper gives you no-lost-step reliability at lower cost than a servo, with strong low-speed torque — ideal for positioning that can't afford a missed step but doesn't run fast. A servo is better when you need high speed, high dynamic response, or continuous duty. For that option, see our servo-motors range.

Can you customize the shaft, winding, and lead wires?

Yes. Shaft diameter and length, D-cut or flat shaft, dual-shaft, lead length and connector, encoder line count, and winding voltage/current are all made to your drawing. A planetary or worm gearbox is also available.

Closed Loop NEMA 23 Stepper Motor: Encoder Feedback, No Lost Steps

The closed loop NEMA 23 stepper motor is a 57mm hybrid stepper with an encoder on the rear shaft. The encoder feeds rotor position back to a closed loop stepper driver, which corrects any following error in real time — so the motor never loses a step, even when the load changes. A NEMA 23 closed loop stepper motor keeps the 1.8° step angle and strong low-speed torque of a standard stepper, but adds the reliability of feedback at a fraction of a servo's cost. Holding torque runs from about 0.55 N·m to 3.0 N·m depending on body length.

Key Specifications at a Glance

Parameter	Specification
Frame Size	57 × 57 mm
Step Angle	1.8° (200 steps/rev)
Type	Closed loop (encoder feedback)
Encoder	1000-line incremental
Holding Torque	0.55–3.0 N·m
Rated Current	2.0–4.2 A/phase
Body Length	41–112 mm (varies by model)
Shaft	6.35mm (1/4") standard

Why Choose Closed Loop

A closed loop stepper sits between an open-loop stepper and a servo. It keeps the stepper's strengths and removes its main weakness — lost steps:

No lost steps — the encoder catches and corrects following error, so the motor holds position under load swings.
Lower heating — current is regulated to what the load needs, instead of full current all the time, so the motor runs cooler.
Position alarm — the driver flags a fault if error exceeds a set limit, useful for unattended machines.
Lower cost than a servo — feedback reliability without servo-level price, ideal for low-to-mid-speed positioning.

The trade-off versus a servo is top speed and dynamic response; for those, a servo is the better fit.

Typical Applications

The closed loop NEMA 23 suits positioning that can't tolerate a missed step:

Desktop and benchtop CNC — routers and mills where a lost step ruins the part.
Pick-and-place and dispensing — repeatable positioning under varying load.
3D printers — high-reliability builds and unattended long prints.
Laser and engraving — clean motion without skipped steps.
Automation and labeling — indexing where position must be guaranteed.
AGV and stage motion — steering and positioning with feedback.

With a gearbox the same frame drives a low-speed, high-torque axis with feedback intact.

Closed Loop vs Open Loop NEMA 23: Which One Do You Need?

Both are 57mm frames with the same base motor. The difference is feedback:

	Closed Loop NEMA 23	Open Loop NEMA 23
Feedback	1000-line encoder	None
Lost steps	Corrected	Possible under overload
Heating	Lower (regulated current)	Higher (full current)
Cost	Higher	Lower

Pick closed loop when a missed step is unacceptable or the machine runs unattended. Pick the open-loop NEMA 23 stepper motor when cost leads and the load is steady. Both are 57mm, so they share mounting. For high-speed duty, consider an AC servo motor.

Customization Options

Cymotorix closed loop NEMA 23 stepper motors can be customized for OEM integration. As a closed loop NEMA 23 stepper motor manufacturer and supplier, we produce them to your specification. Common modifications include:

Shaft diameter and length adjustment (standard shaft is 6.35mm / 1/4")
D-cut or flat shaft for direct coupling
Encoder line count to suit your resolution needs
Custom lead wire length and connector type
Winding parameters modified to match your driver voltage and current
Dual-shaft output for a second load
Planetary or worm gearbox integration for higher output torque at low speed

How to Drive a Closed Loop NEMA 23 Stepper Motor

A closed loop NEMA 23 runs on a closed loop stepper driver, which reads the 1000-line encoder and closes the position loop, correcting following error and raising an alarm if error exceeds a set limit. It accepts step/direction pulses like an open-loop system, so it drops into existing controls, but adds feedback. Rated current is around 2.0 to 4.2 A/phase. We supply a matched closed loop driver set up for the motor if you want the pair tested together.

Recommended supply voltage is 24–48VDC. A higher bus voltage holds torque at speed. Because the driver regulates current to the load, a closed loop motor runs cooler than the same motor driven open-loop at full current.