E31NRHT-LDN-M3-00 Kollmorgen
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The Kollmorgen E31NRHT-LDN-M3-00 is a stepper motor from the E Hybrid Stepper Motors series, featuring a frame size of NEMA 34 and SIGMAX construction. It offers a holding torque of 2.38 Newton-meters and supports an axial shaft load of 180 pounds. The motor has a step angle of 1.8 degrees with 200 steps per revolution and a rated current per phase of 5.4 Amps.
Internal Product Review
The E31NRHT-LDN-M3-00 is a Kollmorgen hybrid stepper motor in a NEMA 34 frame with 2.38 N·m holding torque. SIGMAX construction and a 1.8-degree step angle give this motor a precise, well-controlled feel in indexing and positioning duty. With 5.4 A per phase and winding optimized for maximum torque at low speed, this model stands out as a strong choice for demanding low-speed motion applications.
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Product Description:
The E31NRHT-LDN-M3-00 is a hybrid stepper motor produced by Kollmorgen for the E Hybrid Stepper Motors series. As a two-phase electromagnetic positioning device, it delivers incremental motion for indexers, pick-and-place heads, and small gantry axes that do not require closed-loop feedback. The motor combines laminated steel stator poles with SIGMAX construction to maximize magnetic flux. Its NEMA mounting style supports installation in commonly used automation frames without custom adapters.
The square frame conforms to the NEMA 34 envelope, which establishes the front-face pilot and bolt-circle dimensions. A holding torque of 2.38 N·m resists shaft movement whenever the rated phase current is applied, keeping loads stable at rest. Motion occurs in discrete steps of 1.8 degrees, dividing a full revolution into 200 positions while maintaining step accuracy within ±1.5 percent for repeatable indexing. Each phase draws 5.4 A through 18 AWG lead wires, and the winding resistance of 0.29 Ω limits copper loss while supporting a rapid torque rise. The phase inductance is 2.5 mH, which helps determine compatible drive settings and microstepping rates. Four lead wires arranged for parallel connection lower inductance and enable higher slew speeds when paired with low-voltage drivers. A thermal resistance of 3.9 °C/W indicates the winding-to-ambient temperature gradient, while Class B insulation tolerates hot-spot temperatures up to 130 °C during continuous duty.
The shaft tolerates an axial load of 180 lb and a radial load of 35 lb, accommodating typical belt-pulley and leadscrew thrust loads. The permitted operating temperature range is -20 °C to +40 °C. The resin-impregnated windings provide an insulation resistance of 100 megohms when tested at 500 V. A weight of 3.2 lb keeps moving mass moderate in mobile stages, while a rotor inertia of 0.0083 oz-in-s² balances torque production with quick acceleration. The varnish system uses Class B insulation and provides dielectric strength up to 340 V DC. The single-stack design uses windings intended to produce maximum torque at low speed, favoring strong holding performance over high rotational speed.
