E21NRHT-LDF-NS-00 Kollmorgen
Wake Industrial LLC is not an authorized distributor of this product.
The Kollmorgen E21NRHT-LDF-NS-00 is part of the E Hybrid Stepper Motors series and features a NEMA 23 frame size with a motor diameter of 2.25 inches. It is built with SIGMAX construction, has a smooth shaft, and offers 200 steps per revolution with a step angle of 1.8 degrees. This motor has 4 lead parallel connections, operates within an insulation class B up to 130°C, and is rated for 340 Vdc insulation voltage.
Internal Product Review
The E21NRHT-LDF-NS-00 is a Kollmorgen hybrid stepper motor built in a NEMA 23 frame with regular leadwire connection. SIGMAX construction and a laminated rotor give this unit a precise, stable feel in indexing duty. A 1.8-degree step angle with ±1.5% step accuracy makes this motor a strong choice for dependable low-speed positioning.
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Product Description:
The E21NRHT-LDF-NS-00 is a two-phase stepper motor produced by Kollmorgen for the E Hybrid Stepper Motors series. In automated pick-and-place stations, indexing tables, and small gantry axes, the motor converts pulse commands from a drive into incremental rotary motion. This operation allows open-loop positioning in applications that do not require a full closed-loop servo system. The rotor can hold a commanded position when the drive supplies the necessary holding current.
The square frame follows the NEMA 23 standard and measures 2.25 in across, allowing it to fit brackets designed for this envelope. Power is delivered through a 4-lead parallel connection that is compatible with drives capable of supplying higher current at lower voltage for increased low-speed torque. Kollmorgen’s SIGMAX design uses flux-focusing laminations around the rotor to increase torque density while keeping the single-stack layout compact. The windings use a Class B insulation system rated for 130 °C to withstand heat generated during operation. When line spikes are present, the windings tolerate up to 340 VDC before electrical breakdown, and insulation resistance is rated at 100 megohms. The laminated rotor, smooth shaft, and lack of a shaft seal help minimize drag, while the regular lead-wire connection simplifies termination. A NEMA face-mounting pattern and one-piece stack help keep the air gap concentric and support consistent step accuracy.
Each command pulse advances the rotor by 1.8 degrees, so one complete revolution requires 200 full steps. This step count is compatible with common microstepping controllers that divide each full step into smaller angular increments for smoother motion. The motor operates within a temperature range of -20 °C to +40 °C, supporting use in unheated equipment enclosures and other controlled industrial settings. Its winding arrangement is optimized to provide maximum torque at low speeds, where stepper motors often spend much of their operating time. The motor does not include encoder feedback, so position tracking relies on the commanded step count rather than a separate position sensor. Open-loop operation is appropriate when acceleration, speed, and applied loads remain within the motor’s available torque capacity.
