E34HRHT-LDS-SS-02

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The E34HRHT-LDS-SS-02 is a NEMA 34 hybrid stepper motor with a heavy-duty front end bell and optional encoder connector. Manufactured by Kollmorgen as part of the E Hybrid Stepper Motors series, it supports 4, 6, or 8 leadwire connections with minimum sizes of #18 AWG or #22 AWG. The motor offers a maximum shaft loading capacity of 180 lbs axial force.

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Product Description:

The E34HRHT-LDS-SS-02 hybrid stepper motor combines the features of variable reluctance and permanent magnet motors. It is created by Kollmorgen, and it offers precise positioning, high torque and reliable performance for a wide range of motion control applications.

The E34HRHT-LDS-SS-02 hybrid stepper motor front housing is designed for rugged conditions that provides better durability under mechanical stress or harsh environments. The motor body has an overall diameter of 3.875 inches. In between the mounting holes there is a spacing of 2.875 inches that is critical for ensuring proper fit with mechanical components. The maximum length of the motor that includes its shaft and housing is 193.5 mm. Due to its longer length it has more torque capacity because of its larger rotor and stator. For position feedback the addition of an encoder option is also available if required. In closed loop systems the encoder is needed because of the requirement of precise position control. It allows flexibility in wiring configuration with the availability of 4,6 or 8 leads for unipolar or bipolar operation. The wires come in the sizes between18 AWG to 22 AWG that affects current capacity and voltage drop.

The shaft of this E Hybrid Stepper Motors series module can be customized or replaced based on application requirements. Operating for heavy duty may require larger diameters or special materials to efficiently handle higher loads. The front bearing of this model is designed to support higher axial and radial loads that enhances the motor’s reliability in demanding applications. It is best suitable for semi wet environments because of the Splashproof terminal. Its connector is of militarily standard that is beneficial for secure and vibrant resistant electrical connections.

Connector Type
MS Connector
Frame Size
NEMA 34
Front End Bell Type
Heavy Duty
Front Shaft Bearing
Heavy Duty
Lead Wires
4/6/8 wires; min #18 AWG, #22 AWG
Max Axial Shaft Load
180 lb
Max Length
7.62 in (193.5 mm)
Mount Spacing Diameter
2.875 in (73.03 mm)
Overall Diameter
3.875 in (98.43 mm)
Rated Current per Phase
8.4 A (unipolar)
Rotor Inertia
0.0083 oz·in²
Shaft Configuration
Front replacement; heavy‑duty optional
Terminal Type
Splashproof Terminal
Thermal Resistance
3.9 °C/W

Frequently Asked Questions about E34HRHT-LDS-SS-02:

Q: How does the heavy-duty front shaft bearing enhance motor performance?

A: The heavy-duty front shaft bearing increases load-bearing capacity, improving durability under high axial and radial forces. It reduces wear, extending motor lifespan.

Q: Why is the Kollmorgen E34HRHT-LDS-SS-02 designed with optional encoder connectivity?

A: The optional encoder allows precise position feedback, improving motion accuracy. This is essential for closed-loop control systems requiring high precision.

Q: How does the thermal resistance of 3.9°C/Watt benefit the motor?

A: Lower thermal resistance enhances heat dissipation, reducing the risk of overheating. This maintains motor efficiency during prolonged, high-load operations.

Q: What advantages does the splashproof terminal offer in the E34HRHT-LDS-SS-02?

A: The splashproof terminal protects electrical connections from moisture and contaminants. This ensures reliable performance in harsh or semi-wet environments.

Q: Why is rotor inertia important in the Kollmorgen E34HRHT-LDS-SS-02?

A: The low rotor inertia of 0.0083 oz-in² allows faster acceleration and deceleration. This improves dynamic response for precise motion control tasks.


Internal Product Review

  • ‘‘The Kollmorgen E34HRHT-LDS-SS-02 hybrid stepper motor offers high performance with a rated current of 8.4 Amps per phase and excellent thermal resistance of 3.9°C/Watt. Its heavy-duty front shaft bearing and optional encoder connector enhance load capacity and control precision. The NEMA 34 frame ensures robust, industrial-grade reliability.’’

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