E21NRFT-JDN-NS-02 Kollmorgen
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The Kollmorgen E21NRFT-JDN-NS-02 is a hybrid stepper motor from the E Hybrid Stepper Motors series with a NEMA 23 frame size and a 2.25 inch frame diameter. It offers a step angle of 1.8 degrees, has 8 lead connections, and operates with a regular leadwire connection style. The motor is built with SIGMAX construction, has smooth shaft modifications, and is rated for Insulation Class B at 130°C.
Internal Product Review
The E21NRFT-JDN-NS-02 is a Kollmorgen hybrid stepper motor built in a NEMA 23 frame with a low-inertia rotor. Step accuracy of ±1.5% and a 1.8-degree step angle support precise indexing and smooth low-speed motion. Regular leadwire connectivity with an 8-lead configuration makes this unit a strong choice for straightforward integration.
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Product Description:
The E21NRFT-JDN-NS-02 is a hybrid stepper motor manufactured by Kollmorgen for the E Hybrid Stepper Motors series. Its compact frame targets precise open-loop positioning in pick-and-place stations, small gantries, and indexing tables. The unit mounts directly to compatible machine patterns, employs a smooth shaft for straightforward coupling, and turns digital pulse trains into controlled angular motion for industrial automation tasks. Its open-loop design enables repeatable movement without requiring a position sensor on the motor.
The motor has a frame size of NEMA 23, giving it a 56 mm square mounting face that balances torque capability with compact dimensions. Each command pulse turns the rotor by 1.8 degrees, so one complete revolution provides 200 positions for conveyor indexing and light machining feeds. Mechanical deviation remains within ±1.5% of the nominal step, limiting positioning error during repeated moves. The motor is supplied with an 8-lead harness, allowing its coils to be connected in series or parallel for use with bipolar drives. Kollmorgen’s SIGMAX construction strengthens the magnetic path to produce high holding torque at low speed without feedback. A single rotor stack helps keep the housing length and rotor inertia low, supporting responsive acceleration during frequent start-and-stop cycles.
The electrical system uses Class B insulation rated for 130 °C, helping protect the windings from heat generated during operation. It withstands transient line surges up to 340 VDC and provides insulation resistance greater than 100 megohms. The motor operates at ambient temperatures from -20 °C to +40 °C, making it suitable for typical industrial cabinet conditions. Standard lead-wire termination simplifies cable routing through machine frames and drag chains. The lack of internal feedback supports installations where open-loop control provides sufficient positioning accuracy and fewer signal connections are preferred. The winding is optimized for maximum torque at low speed, providing responsive torque during indexing, feeding, and other start-and-stop motion cycles while remaining within the stated step-accuracy limit.
