E21SCHT-LDN-SS-02 Kollmorgen
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The Kollmorgen E21SCHT-LDN-SS-02 is a NEMA 23 frame size motor in the E Hybrid Stepper Motors series, featuring a frame diameter of 2.25 inches and SIGMAX construction. It has a double smooth shaft with a laminated rotor type, a step angle of 1.8 degrees, and offers 200 steps per revolution with step accuracy of plus or minus 1.5 percent. The motor uses a system MS connector, operates between -20°C and +40°C, and features insulation Class B with a voltage rating of 340 Vdc.
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Product Description:
The E21SCHT-LDN-SS-02 is a hybrid stepper motor produced by Kollmorgen as part of the E Hybrid Stepper Motors series. It converts pulse commands from indexers or PLCs into controlled rotational movement, providing accurate open-loop positioning for pick-and-place heads, small gantries, and general automation axes. Its laminated rotor supports responsive motion during frequent starts and stops. The motor is suitable for both direct-drive and belt-driven mechanisms that require precise bidirectional output.
The motor is built on a NEMA 23 frame with an overall body diameter of 2.25 in, enabling direct mounting to compatible brackets. Each electrical cycle advances the rotor by 1.8 degrees, yielding 200 full steps per revolution, and cumulative position error is limited to ±1.5%. An insulation withstand rating of 340 VDC supports higher-voltage microstepping drives while maintaining appropriate thermal protection. The single-stack core, laminated rotor, and windings optimized for maximum torque at low speed provide high holding torque without excessive overshoot. Connectivity is handled through the System MS circular connector. The motor receptacle is an MS3122E14-5P connector, and the matching cable plug is an MS3116F14-5S connector.
A measured insulation resistance of 100 megohms indicates reliable dielectric isolation after extended storage. Continuous operation is permitted from -20 °C to +40 °C, covering typical cabinet and shop conditions. Kollmorgen’s SIGMAX construction focuses magnetic flux to raise torque density without increasing heat generation. Phase conductors use a four-lead parallel configuration, supporting the required connection arrangement for the motor windings. The smooth double-ended shaft allows coupling to an encoder or lead screw at the rear while the primary end drives the load. Black, orange, red, and yellow color-coded leads make conductor identification straightforward during installation and maintenance. Class B insulation helps protect the windings during repetitive start-stop operation and sustained holding periods.
