E21NRFT-LDN-NS-00
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The E21NRFT-LDN-NS-00 stepper motor is a bipolar motor with a step angle of 1.8° per step, offering 200 steps per revolution, and supports microstepping for enhanced precision. Part of the E Hybrid Stepper Motors by Kollmorgen, it is designed for open-loop step control and standard mounting applications.
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Product Description:
Kollmorgen manufactures the E21NRFT-LDN-NS-00. Bipolar stepper motors like the Kollmorgen E21NRFT-LDN-NS-00 are electromagnetic devices that mechanically rotate in response to digital pulse inputs. Because it’s bipolar, it generates a rotating magnetic field by energizing two separate coil windings in sequence. The rotor moves in discrete angular steps as a result of this field interacting with its magnetic poles. The Lorentz force, which is the force applied to a moving charge in a magnetic field, is the underlying principle of this motion. The motor achieves precise angular displacement by controlling the current flowing through the coils. One key factor is the motor’s step angle, which is set to 1.8° per step. This determines the smallest angular increment the rotor can move with each pulse. So the motor has 200 steps per rotation (360° / 1.8° = 200). Applications that require precise control, like robotics, automated assembly and precision positioning systems, rely on this accuracy. The step angle directly affects the motor’s resolution; a lower step angle means a higher resolution.
Also, micro-stepping, a technique that improves positional accuracy beyond the basic step angle, is supported by this motor. Micro-stepping divides each full step into smaller increments by sinusoidally varying the motor’s winding current. This reduces the inherent jerkiness of stepper motor motion and produces smoother and more accurate movement. Applications like optical equipment and medical devices that require high precision and low vibration benefit from the ability to get tighter control through micro-stepping. The E21NRFT-LDN-NS-00 is an open-loop step control system. This means there is no feedback system to confirm the motor’s position; its position is determined only by the number of pulses it receives. This simplifies the control system and reduces cost but requires careful load and operating state consideration to avoid missing steps or synchronization loss. However, the system relies on the quality of the driving signals and the motor’s intrinsic accuracy since there are no feedback sensors. When the load and operational parameters are clear and consistent, this works fine.
The motor can reach quite high speed, as seen by its 1500 RPM rating. Stepper motors are good for applications that require accurate placement at lower speeds since they are known for their high torque at low speeds. The electromagnetic interaction between the rotor and stator determines the torque-speed characteristic of stepper motors, and the motor is designed to have high torque at a lower speed. The torque-speed curve is affected by several variables, including the motor’s inductance, resistance and magnetic circuit design. The “Focus Motor” designation for the 32-tooth and 48-tooth gear/tooth versions means the motors can be used in systems that require varying torque/speed ratios.
Frequently Asked Questions about E21NRFT-LDN-NS-00:
Q: What type of motor is the E21NRFT-LDN-NS-00?
A: The E21NRFT-LDN-NS-00 is a bipolar stepper motor from Kollmorgen’s E Hybrid Stepper Motors series. It operates using two phases and provides precise incremental movement, making it ideal for automation applications that require controlled positioning.
Q: What is the step angle of the E21NRFT-LDN-NS-00 motor?
A: This motor has a step angle of 1.8° per step, meaning it takes 200 steps to complete a full revolution. This standard step size allows for accurate motion control, and when combined with microstepping, it can achieve even finer positioning.
Q: Does the E21NRFT-LDN-NS-00 support microstepping?
A: Yes, this stepper motor supports microstepping, which allows for increased resolution and smoother motion by subdividing each full step into smaller increments. This enhances precision and reduces vibration, making it useful in applications that demand refined control.
Q: What type of control system does this motor use?
A: The E21NRFT-LDN-NS-00 operates on an open-loop step control system. This means that it does not use feedback sensors to verify position but relies on precise step commands from a controller to determine motion. Open-loop control is reliable in applications where external forces do not disrupt movement.
Q: What is the rated speed of the E21NRFT-LDN-NS-00?
A: This stepper motor typically operates at speeds of up to approximately 1500 RPM. However, actual speed depends on factors like load, drive voltage, and microstepping settings. Stepper motors usually maintain high torque at lower speeds, making them suitable for applications requiring controlled movement.
