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56S closed-loop stepper motor series

Manufacturer catalogue image · Series illustration

Stepper motors

56S closed-loop stepper motor series

SYN-TRON logoSYN-TRONView manufacturer →
Control
Closed-loop; compatible driver required
Insulation
Class B
Step Angle
1.8°
Holding Torque Options
1.1 / 1.8 / 2.8 N·m

Catalogue series · Exact configuration and availability confirmed by the manufacturer.

56S: the 2.8 N·m option also changes the winding, length and inertia

The July 2026 56S catalogue lists three two-phase, 1.8° closed-loop stepper variants. They share an 8 mm shaft, but their current, inductance, mass and body length differ. Select the complete motor and compatible drive as an axis; the largest holding-torque figure is not automatically the best replacement for a compact, fast-cycling machine.

Three real rows, with electrical and mechanical tradeoffs kept together

CK, DK and EK below mean 56SBYG250CK-SASSBL-0242, 56SBYG250DK-SASSBL-0242 and 56SBYG250EK-SASSBL-0602 respectively. L is the drawing dimension. Holding torque is static, not a running-torque curve.

ParameterCK · 0242DK · 0242EK · 0602
Catalogue code 034010 034020 034030
Holding torque 1.1 N·m 1.8 N·m 2.8 N·m
Static phase current 2.4 A 2.4 A 6.0 A
Phase resistance 1.2 Ω 1.5 Ω 0.5 Ω
Phase inductance 4.5 mH 6.2 mH 2 mH
Drawing length L 74 mm 94 mm 130 mm
Mass 0.68 kg 1.05 kg 1.4 kg
Rotor inertia 280 g·cm² 440 g·cm² 800 g·cm²

Choose the row using the machine’s actual move

A change from CK to DK or EK changes more than holding torque. Use the available mounting space, load and acceleration requirement to narrow the choice.

A replacement must fit the complete assembly

The outline has a 56.4 mm face, a 47.14 mm hole pattern and an 8 mm shaft for all three listed versions, but L grows from 74 to 130 mm. Check rear cable clearance and the drawing’s locating register as well as the bolt pattern. The manufacturer specifically requires register location and shaft alignment; matching screw spacing alone is not sufficient.

A fast axis needs the running curve, not just more holding torque

The published CK and DK curves are labelled for a 48 V drive and a 0.9° command step. They distinguish normal-operation and overload curves. Select the normal operating curve for sustained motion and check the actual speed/torque points; do not treat the overload line as a continuous rating. The catalogue’s nominal motor step angle remains 1.8°—the graph’s command setting is a different condition.

The EK winding needs its own drive check

The EK row is 6 A per phase rather than the CK/DK 2.4 A, with higher rotor inertia and a longer body. Ask for its matching drive setup and operating curve before choosing it for higher acceleration. The visible CK/DK graphs do not establish EK performance, and a larger static torque does not by itself prove a faster move.

Keep the drive revision and harness method on the order

The current motor sheet names SS-20804 and SS-20806 Ver1.1 as typical matching drivers. Preserve that version qualification when reviewing an existing cabinet or a new quotation.

Specify the feedback-equipped motor

The naming diagram identifies the S after 56 as a 1000-line incremental encoder version; an omitted encoder designation is not the same motor configuration. Provide the full nameplate reference and the driver revision. A driver with the same general family name should not be assumed to have the required motor configuration.

Match signals, not wire colours from memory

The manual shows two motor/encoder wiring methods with different colour assignments. For example, the A− motor lead is green in one method and blue in the other. Identify the supplied harness method and use its complete connection drawing. Do not combine power-lead colours from one method with encoder colours from the other.

Send a brief that can be checked

Include the selected full reference, existing drive and revision, supply, target speed, move distance, acceleration time, load/transmission details and space available for L. Add a photograph of the existing connectors for replacement work. Ask the offer to identify the motor, driver settings, wiring method and curve together, so the axis can be approved as a complete combination.

CATALOGUE OVERVIEW

About this motor series

The SYNTRON 56S family combines a two-phase hybrid stepper motor with feedback for use in a compatible closed-loop drive system. Published holding-torque options are 1.1 / 1.8 / 2.8 N·m, depending on the motor length and winding. The catalogue specifies a 1.8-degree step angle and class B insulation.

Provide the required running torque, speed, inertia and positioning cycle when requesting a quotation. Confirm encoder compatibility, cable pinout and the chosen driver together with the motor; feedback does not remove the need to size the axis mechanically.

Model / series reference: 56S

Published specifications

Specifications describe a series range; confirm which ratings apply together to the quoted model.

Control
Closed-loop; compatible driver required
Insulation
Class B
Step Angle
1.8°
Holding Torque Options
1.1 / 1.8 / 2.8 N·m
Power
Confirm configuration
Voltage
Confirm supply
Speed
Model dependent
Catalogue Type
Product series

Confirm mounting and shaft dimensions against the drawing for the quoted configuration.

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