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A ​linear stepper motor​ is an electric motor that can convert an electrical pulse signal into a corresponding linear displacement. It converts rotary motion into linear motion by interacting with the pulsed electromagnetic field generated by the magnetic rotor core and the stator. Linear stepper motors can directly perform linear motion or linear reciprocating motion without the need for external mechanical linkage devices, thereby simplifying the design and improving the accuracy of motion.

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The working principle of linear stepper motors is based on the interaction of electromagnetic fields. When current passes through the stator winding, a vector magnetic field is generated, which drives the rotor to rotate a certain angle so that the direction of a pair of magnetic fields of the rotor is consistent with the direction of the magnetic field of the stator. For each input of an electrical pulse, the rotor will rotate an angle and move forward one step. By controlling the number of pulses, frequency, and the order of power-on of each phase winding of the motor, the movement of the motor can be precisely controlled.

1. High-precision control: Linear stepper motors precisely control the position and displacement of the motor by receiving pulse signals, and high-precision position control can be achieved without the need for additional position feedback devices. This precise control enables linear stepper motors to excel in applications that require high-precision positioning, such as ultra-precision machining and optical component processing.

‌2. Fast response: Due to the elimination of the intermediate transmission mechanism, the acceleration and deceleration time of the linear stepper motor is greatly shortened, and fast startup and forward and reverse operation can be achieved. This gives linear stepper motors a significant advantage in applications that require fast response, such as high-speed production lines and applications under special working conditions.

‌3. High acceleration: The acceleration of the linear stepper motor can reach 2-10g (g=9.8m/s²), which makes it excel in applications that require high-speed movement, such as maglev trains and high-speed cutting machine tools.

‌4. Reduce vibration and noise: Due to the elimination of mechanical components such as the transmission screw, the mechanical friction generated by the linear stepper motor during operation is reduced, thereby reducing noise and vibration. This is very important for applications that require a low-noise environment.

‌5. High efficiency‌: Linear stepper motors eliminate energy loss in the intermediate transmission link through direct drive, and the energy conversion efficiency is as high as 85-92%, which makes it more efficient in energy utilization‌.

‌6. Simplified structure‌: Linear stepper motors are directly driven by the mover-stator, eliminating intermediate transmission components, simplifying the mechanical structure, and improving overall reliability and maintainability‌.

‌1. Industrial automation‌: Linear stepper motors are widely used in industrial robots, mold machinery, printing machinery and other equipment. They provide high-precision, high-stability and high-efficiency motion control, and are suitable for driving components of various automated production lines and robotic arms‌.

‌2. Planar mobile devices‌: Linear stepper motors are used for planar mobile devices such as laser cutting machines, printers, scanners, etc. These devices require precise positioning and fast response, and linear stepper motors can meet these requirements‌.

‌3. Measuring instruments‌: In the field of measuring instruments, linear stepper motors are used for high-precision 3D scanners, optical measuring equipment, etc. These devices require high-precision motion control, and linear stepper motors can provide stable performance.

‌4. Medical equipment: Linear stepper motors are also used in medical equipment, such as medical instruments, surgical instruments, etc. They perform well under the high precision and stability requirements in the medical field.

‌5. Other applications: In addition, linear stepper motors are also used for focusing camera lenses, moving optical equipment, etc. These applications require fast response and high-precision control of the motor.
Source:​https://steppermotor2.hatenablog.com/entry/2025/06/05/180516​