Closed-loop stepper motor
Leadshine CS-M Series closed-loop stepper motor
2-phase closed-loop stepper motors with built-in incremental encoders that replace the ES-M easy-servo line; brake, IP65 and imperial-shaft versions.
Key specifications
| Ingress protection | IP40 standard, IP65 (WP models) |
|---|---|
| Supply | 24-110 VDC via CS drive (model dependent: NEMA17 24/36, NEMA23-24 24/36/48, NEMA34 36/48/70, CS-M234120 48/70/110) |
| Feedback | incremental encoder 1000-line (4000 cpr) or 5000-line (20000 cpr); catalogue also lists 2500 ppr |
| Current (max) | 6 A |
| Holding torque | 0.03–12 Nm |
| NEMA sizes | 8, 11, 17, 23, 24, 34 |
| Step angle | 1.8 ° |
| Speed (max) | 3,000 rpm |
| Rated current range | 1.2-6 |
| Phases | 2 |
| Position accuracy | +/-0.09 deg |
Series ranges as published; individual models vary. The full datasheet, drawings and CAD models are available on request.
Options
- holding brake (B suffix)
- IP65 (WP suffix)
- imperial shaft 6.35/12.7 mm (-S suffix)
Typical applications
What a closed-loop stepper motor is
A closed-loop stepper is a hybrid stepper motor fitted with an encoder and run by a drive that uses the feedback to correct position and adjust current. If the load causes the rotor to lag, the drive detects the error and corrects it rather than losing steps silently. Many drives also reduce current when torque is not needed, lowering heat and noise. The motor keeps the stepper's strong low-speed torque but gains some servo-like behaviour.
When engineers choose a closed-loop stepper motor
Choose a closed-loop stepper when an open-loop stepper is nearly right but missed steps, heat or noise are a concern, such as varying loads, fast indexing or machines that must report a fault. It is typically cheaper and simpler than a servo. The trade-offs are high-speed performance and dynamics: torque still falls at speed, and peak acceleration is lower than a servo. For high-speed, high-dynamic axes, a servo remains better.
How to specify the Leadshine CS-M Series
Send these with your enquiry and an engineer can confirm the right Leadshine CS-M Series variant:
- Holding torque and torque at speed (Nm, rpm)
- Frame size (NEMA or mm)
- Encoder resolution (counts per revolution)
- Drive voltage and current (V, A)
- Control interface: pulse, fieldbus or Ethernet
- Fault outputs and alarm handling
- Brake and IP options
Common mistakes to avoid
- Assuming closed loop gives servo performance at high speed
- Not wiring the drive alarm output to the controller
- Using an encoder resolution the drive does not support
- Ignoring tuning settings for heavy loads
Leadshine CS-M Series: frequently asked questions
What is the Leadshine CS-M Series?
2-phase closed-loop stepper motors with built-in incremental encoders that replace the ES-M easy-servo line; brake, IP65 and imperial-shaft versions. Published series figures include current 6 A, holding torque 0.03 Nm, holding torque 12 Nm, step angle 1.8 °. It is available through our supply network, and our engineers can confirm the right variant for your application.
Who makes the Leadshine CS-M Series?
The Leadshine CS-M Series is made by Leadshine (Leadshine Technology) available through our supply network. Send us your requirement for pricing, lead time, datasheets and CAD.
What is the current of the Leadshine CS-M Series?
The published series maximum current is 6 A. Individual models and sizes in the Leadshine CS-M Series range vary, so check the exact variant against your duty cycle, mounting and environment, or ask our engineers to confirm the right size for you.
What is the difference between a closed-loop stepper and a servo?
Both use feedback, but a closed-loop stepper keeps the stepper's high pole count, giving strong low-speed torque and a stepper-style drive, while a servo motor is optimised for high speed and dynamics. Closed-loop steppers are usually cheaper and simpler to set up; servos usually perform better at high speed.
Do closed-loop steppers run cooler?
Often, yes. Many closed-loop drives reduce current when less torque is needed, while open-loop drives run full current regardless. This lowers motor temperature and noise. The benefit depends on the drive and the load profile, so check the drive's current control mode.
Further reading: Closed loop stepper motors explained · Servo vs stepper · Servo and stepper motors
Often compared with
Engineers specifying this series often compare it with:
Other closed-loop stepper motor series
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