E21NRFT-LDN-NS-00 Kollmorgen
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The Kollmorgen E21NRFT-LDN-NS-00 is part of the E Hybrid Stepper Motors series and features a 2.25 inch frame diameter with NEMA 23 frame size. This stepper motor has a step angle of 1.8 degrees, 8 lead connections, and operates with a laminated rotor and SIGMAX construction. It is rated for 340 Vdc insulation voltage and an insulation class of B, with smooth shaft modifications and a maximum operating temperature of 40°C.
Internal Product Review
The E21NRFT-LDN-NS-00 is a Kollmorgen E Hybrid stepper motor with a NEMA 23 frame and a 1.8-degree step angle. SIGMAX construction and a winding tuned for maximum torque at low speed give the motor a very capable profile for precise indexing applications. Step accuracy of ±1.5% stands out as a key performance advantage.
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Product Description:
The E21NRFT-LDN-NS-00 is a hybrid stepper motor manufactured by Kollmorgen within the E Hybrid Stepper Motors series. This two-phase device converts discrete pulse trains from an external drive into incremental rotary motion, allowing positioning tasks such as operating indexing tables, moving small gantries, or driving metering pumps without a feedback loop. Its single-stack rotor, laminated core, and smooth shaft support direct coupling to compatible loads. The standardized mounting flange also allows the motor to fit common automation frames without a custom mounting plate.
The motor advances by 1.8 degrees per step, so one complete shaft revolution requires 200 mechanical increments. Step accuracy is held to ±1.5%, keeping positional error low for pick-and-place heads and simple dispensing axes. The winding is optimized to provide maximum torque at low speed, and the lack of an encoder or resolver simplifies cabling when open-loop control is acceptable. A frame size of NEMA 23 provides a common bolt pattern that matches many gearheads and brackets. The SIGMAX construction increases torque density by reducing magnetic flux leakage. Eight discrete conductors emerge from a standard lead-wire harness, allowing the coils to be connected in series or parallel to suit the voltage and current characteristics of the drive.
The round housing has a diameter of 2.25 in., providing a compact profile for space-constrained motion systems. The insulation system has a voltage rating of 340 VDC and an insulation resistance of 100 megohms, supporting operation on typical motion-control buses. Class B insulation materials tolerate winding temperatures up to 130 °C. The specified continuous operating temperature range is -20 °C to +40 °C. No shaft seal is fitted, so the motor should be installed where it will remain protected from liquid ingress. The standard lead-wire connection terminates in a set of eight leads that can be routed directly to terminal strips or other compatible electrical connections.
