A closed loop stepper motor integrates feedback mechanisms into the traditional stepper motor design. Unlike open-loop stepper motors, which operate solely on predetermined power pulses without real-time feedback, closed loop stepper motors incorporate an encoder or similar device to continuously track and adjust the motor's performance. This feedback allows for precise control over position and speed, even in varying load conditions, enhancing reliability and efficiency.
The Jkongmotor closed loop stepper motors feature either optical or magnetic encoders, providing resolutions of 1000 lines or 1024 lines. Designed for high precision and anti-interference, these motors perform well in environments with dust, dirt, and oil contamination. They offer straightforward closed-loop control and are available in various NEMA sizes, including Nema 11, Nema 17, Nema 23, Nema 24, and Nema 34.
| Model | Step Angle | Phase | Shaft Type | Body Length | Current | Resistance | Inductance | Holding Torque | Leads No. | Rotor Inertia | Weight |
| (°) | / | / | (L) mm | A | Ω | mH | N.cm | No. | g.cm2 | Kg | |
| JK28HSN006 | 1.8 | 2 | Round | 32 | 0.67 | 5.6 | 3.4 | 6 | 4 | 9 | 0.11 |
| JK28HSN009 | 1.8 | 2 | Round | 45 | 0.67 | 6.8 | 4.9 | 9.5 | 4 | 12 | 0.14 |
| JK28HSN012 | 1.8 | 2 | Round | 51 | 0.67 | 9.2 | 7.2 | 12 | 4 | 18 | 0.2 |
| Model | Step Angle | Phase | Shaft Type | Body Length | Current | Resistance | Inductance | Holding Torque | Leads No. | Rotor Inertia | Weight |
| (°) | / | / | (L)mm | A | Ω | mH | Nm | No. | g.cm2 | Kg | |
| JK57HSN12 | 1.8 | 2 | D-cut | 56 | 4.2 | 0.4 | 1.5 | 1.2 | 4 | 280 | 0.68 |
| JK57HSN21 | 1.8 | 2 | D-cut | 76 | 4.2 | 0.6 | 2 | 2.1 | 4 | 440 | 1.1 |
| JK57HSN30 | 1.8 | 2 | D-cut | 112 | 4.2 | 0.9 | 4 | 3 | 4 | 800 | 1.4 |
| Model | Step Angle | Phase | Shaft Type | Body Length | Current | Resistance | Inductance | Holding Torque | Leads No. | Rotor Inertia | Weight |
| (°) | / | / | (L)mm | A | Ω | mH | Nm | No. | g.cm2 | Kg | |
| JK86HSN45 | 1.8 | 2 | Key | 78 | 6.0 | 0.27 | 2 | 4.5 | 4 | 1400 | 2.3 |
| JK86HSN65 | 1.8 | 2 | Key | 100 | 6.0 | 0.27 | 2.2 | 6.8 | 4 | 2200 | 3 |
| JK86HSN85 | 1.8 | 2 | Key | 115 | 6.0 | 0.36 | 3.8 | 8.5 | 4 | 2700 | 4.2 |
| JK86HSN120 | 1.8 | 2 | Key | 155 | 6.0 | 0.44 | 3.8 | 12.0 | 4 | 4000 | 5.5 |
The operation of a closed loop stepper motor is fundamentally based on a feedback system, typically utilizing an encoder to continuously track the rotor's position. Here’s a detailed breakdown of the process:
The operating controller sends a pulse or command to instruct the motor to move to a specific position or to rotate at a designated speed.
The stepper motor responds by moving in small, precise increments that correspond to the pulse signals it receives. Unlike traditional open-loop systems, this movement occurs with real-time monitoring.
As the motor operates, an encoder or position sensor tracks the rotor's actual position. This real-time feedback is relayed back to the controller, allowing it to monitor the motor's performance.
If the encoder data indicates a discrepancy between the desired position and the actual position—potentially caused by variations in load or other external factors—the controller adjusts the current flowing to the motor to rectify the difference.
This feedback process is ongoing, ensuring that the motor remains within its optimal operational parameters, even as conditions change around it.
The primary distinction between closed loop and open loop stepper motors lies in the feedback system. Closed loop motors can make continual adjustments, resulting in improved precision, stability, and efficiency during operation.
The feedback mechanism in closed loop stepper motors allows for accurate responses to input commands, effectively correcting issues like missed steps or positional shifts that can happen in open-loop systems.
These systems intelligently adjust their power consumption based on actual load requirements, minimizing energy waste and enhancing overall efficiency.
By regulating power usage through feedback, closed loop motors produce less heat compared to open-loop motors, which operate on a constant power supply even when full power isn't needed.
The continuous monitoring and adjustments made possible by the feedback system lead to smoother operation, resulting in significantly lower noise and vibration levels than those found in open-loop stepper motors.
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