E21NSFT-JSN-NS-02 Kollmorgen
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The Kollmorgen E21NSFT-JSN-NS-02 is a hybrid stepper motor from the E Hybrid Stepper Motors series with a NEMA 23 frame size and an overall frame diameter of 2.25 inches. It features eight lead connections and SIGMAX construction and is rated for 340 VDC insulation voltage and Class B insulation at 130°C. The motor offers 1.8 degree step angles, 200 steps per revolution, and has a smooth shaft with low inertia.
Internal Product Review
The E21NSFT-JSN-NS-02 is a Kollmorgen hybrid stepper motor in a NEMA 23 frame with a low-inertia rotor. SIGMAX construction and a 1.8-degree step angle support smooth indexing and dependable low-speed torque in motion applications. An 8-lead design with parallel, series, or unipolar connection modes makes this motor especially adaptable for drive matching.
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Product Description:
The E21NSFT-JSN-NS-02 is a hybrid stepper motor produced by Kollmorgen for the E Hybrid Stepper Motors series. It occupies the mid-frame performance class and is intended to deliver repeatable angular increments in pick-and-place heads, light gantries, and general automation axes. By advancing one electrical step per commanded pulse, the motor provides simple open-loop positioning without closed-loop sensors, making it a practical choice where moderate torque and high positioning repeatability are required. This operating method also allows a compatible pulse-train controller to regulate movement without processing position data from an encoder.
Each electrical step corresponds to a mechanical advance of 1.8 degrees, yielding 200 discrete positions per revolution for fine incremental control. Positional deviation is limited to ±1.5%, so commanded moves stay within narrow tolerance bands. The motor uses a NEMA 23 frame that measures 2.25 inches across, allowing installation in standard mounting brackets. A low-inertia rotor and SIGMAX construction support quick acceleration, while a smooth shaft transmits torque without keyway stress. The single-stack magnetic circuit is wound for maximum torque at low speed. Thermal endurance is supported by a Class B insulation system rated for 130 °C, while an insulation resistance of 100 megohms provides leakage protection under humid conditions.
Wiring flexibility is provided by an 8-lead harness that supports parallel, series, and unipolar connections, allowing the drive configuration to balance speed, current, and voltage for the application. The coils withstand up to 340 VDC during impulse testing, and the assembly maintains dielectric strength throughout an ambient temperature range of -20 °C to +40 °C. The face-mounting pattern simplifies installation in compatible brackets and helps keep the shaft aligned with the driven load. The available winding connections also support several common stepper drive arrangements without requiring changes to the motor housing.
