E21NRFT-JNN-NS-00 Kollmorgen
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The Kollmorgen E21NRFT-JNN-NS-00 is a stepper motor in the E Hybrid Stepper Motors series featuring a NEMA 23 frame size with a 2.25 inch diameter. It has SIGMAX motor construction, an 8-lead regular leadwire connection, and a smooth shaft with no shaft seal. The motor operates at a step angle of 1.8 degrees and maintains step accuracy within plus or minus 1.5 percent.
Internal Product Review
The E21NRFT-JNN-NS-00 is a well-engineered hybrid stepper motor with a NEMA 23 frame and a low-inertia rotor design. A 1.8-degree step angle paired with ±1.5% step accuracy supports smooth indexing and dependable positioning. The max-torque-at-low-speed winding gives this unit strong value in precision motion applications.
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Product Description:
The E21NRFT-JNN-NS-00 is a hybrid stepper motor manufactured by Kollmorgen for the E Hybrid Stepper Motors series. This rotary actuator converts discrete pulse commands into incremental shaft motion for indexing tables, pick-and-place axes, and other open-loop positioning tasks in industrial automation. The unit uses regular lead-wire connections and does not include a feedback device. Its SIGMAX construction concentrates magnetic flux to increase the available torque. A single-stack rotor with a smooth shaft and no shaft seal keeps rotational inertia low for rapid start-and-stop cycles in clean operating areas.
The motor advances 1.8 degrees with each full command step, providing a resolution of 200 steps per revolution. Its step accuracy of ±1.5% supports precise incremental movement when the motor is paired with a suitable controller and mechanical load. The NEMA 23 frame and 2.25-inch outside diameter support installation with commonly used brackets and compatible gearboxes. Class B windings have a thermal rating of 130 °C, allowing continuous operation during demanding duty cycles when appropriate cooling and current limits are maintained. The internal winding pattern provides high torque at low speeds, supporting strong holding and starting performance at modest drive frequencies. Regular lead wires extend from the housing and permit series, parallel, or unipolar connection arrangements according to the selected drive configuration.
The electrical insulation withstands up to 340 VDC and provides an insulation resistance of at least 100 megohms. These electrical characteristics help protect the windings against dielectric breakdown when the motor is connected to a compatible high-performance drive. The stator terminates in an 8-lead harness, allowing the phase windings to be configured for different current and voltage requirements. The permitted ambient operating range is -20 °C to +40 °C, so the installation must maintain air temperature within those limits during service. The standard mounting face provides a rigid connection to the machine structure, while the torque-focused design supports quick acceleration and controlled low-speed movement. Proper coupling alignment helps prevent excessive radial loading on the shaft and bearings during repeated indexing cycles.
