DST 86 Series Stepper Motor

DST 86 Series Stepper Motor

(Also referenced as “Stepper Motor – DST86”)

The DST86 series is a line of hybrid stepping motors with a larger frame size (nominal “86”), designed for higher torque, moderate-speed positioning applications. It’s part of TECO’s DST family of stepping motors.  These motors are suitable for automation axes that require more power than smaller-frame stepper motors (e.g., DST56 or DST42), while still offering stepping-motor advantages (precise incremental motion and reliable open-loop or, optionally, closed-loop control).

Key Features & Specifications

• Frame/Size: The “86” indicates a larger frame/size class (86 mm or equivalent dimension) compared to smaller frames such as 42 or 56. For example, TECO lists the DST86 alongside “DST28”, “DST42”, and “DST56” in its catalogue.

• Step Angle: As with standard hybrid steppers, typically 1.8° per complete step (200 steps/revolution) or variants thereof; micro-stepping drivers may be used for finer resolution.

• Electrical Configurations: Available in bipolar (6 leads) or unipolar (8 leads) winding configurations. Example models include “DST86ES61A” (6-lead bipolar) and “DST86ES83A” (8-lead unipolar).

• Holding Torque / Rotor Inertia: TECO’s spec listings mention rotor inertia values for size “86” series (e.g., 1400 / 2700 / 4000 g-cm²) and motor weight ~1.75 kg to ~3.93 kg in that class.

• Precision: Step-angle accuracy and repeatability are typical of hybrid stepper motors; TECO lists a size 86 “±5%” step-angle accuracy and a radial-play spec.

• Application Range: Suitable for moderate-to-high torque indexing tables, rotary positioning platforms, medium-duty conveyors, feeders, packaging machinery, or other automation axes needing more torque than smaller frames but simpler control than servo motors.

Advantages & Design Considerations

• Higher Torque Capacity: The larger frame size allows greater holding torque and can drive higher inertial loads than smaller-frame stepper motors (DST28, DST42, DST56).

• Precise Step-Control Motion: Each step is a fixed angular move, making open-loop control practical in many applications with moderate speeds or low dynamics.

• Cost-Effective Motion Control: For many automation systems, a large-frame stepper like the DST86 offers a good balance of torque and control costs compared to a complete servo system.

• Inertia Matching: Because the frame is larger and has higher rotor inertia, the motor is better matched to heavier load inertias. However, one must still ensure that load inertia is not excessively higher than the motor’s inertia, or instability/resonance may occur.

• Speed & Torque Trade-Off: As with all stepper motors, as speed increases, available torque drops due to inductance and back-EMF effects. For high-speed, high-duty axes, a servo motor may still be preferable.

Typical Applications

• Rotary indexing tables in packaging or assembly lines

• Medium-duty pick-and-place machines with moderate mass

• Conveyor drives for medium loads

• Automation equipment requiring precise stopping/starting, but not ultra-high speed

• Machinery where cost and simplicity of open-loop stepper control are preferred over closed-loop servo

The DST86 Series Stepper Motor offers a larger-size hybrid stepper solution, providing greater torque and load capacity than smaller-frame stepper motors while retaining the benefits of stepping motion (precise increments, simple control). When properly matched and driven, it presents an efficient choice for many automation tasks.