Screw shaft motor

Product Introduction

A screw stepper motor, also known as a linear stepper motor, is a type of motor that rotates through the interaction between a magnetic rotor core and a pulsed electromagnetic field generated by a stator. The screw stepper motor converts rotational motion into linear motion inside the motor.

The basic principle of this motor is to use a screw and nut to mesh, and to use some method to prevent the relative rotation of the screw and nut, so as to make the screw move axially. Generally speaking, there are currently two ways to achieve this conversion. The first is to embed a rotor with internal threads in the motor, and use the internal threads of the rotor to mesh with the screw to achieve linear motion. The second is to use the screw as the motor output shaft, and use an external drive nut to mesh with the screw outside the motor to achieve linear motion. The result of doing so greatly simplifies the design, enabling precise linear motion to be achieved directly using a screw stepper motor in many application fields without installing external mechanical linkage devices.

Detailed explanation of the purpose of the screw stepper motor:

When the screw stepper motor is working, each phase winding is not constantly energized, but alternately energized according to a certain rule.
2. The angle at which the rotor rotates with each input pulse electrical signal is called the step angle.
3. The screw stepper motor can be controlled for angle and speed according to specific instructions. When controlling the angle, for each input pulse, the stator winding is switched once, and the output shaft rotates through an angle with the same number of steps as the number of pulses. The angular displacement of the output shaft rotation is proportional to the input pulse. When controlling the speed, continuous pulses are fed into the winding of the stepper motor, and the windings of each phase are continuously energized. The stepper motor rotates continuously, and its speed is proportional to the pulse frequency. By changing the power on sequence, that is, by changing the direction of rotation of the stator magnetic field, the motor can be controlled to rotate forward or backward.
4. The screw stepper motor has self-locking capability. When the control pulse stops inputting and the winding controlled by the last pulse continues to be powered by DC, the motor can remain in a fixed position, that is, at the end position of the angular displacement controlled by the last pulse. In this way, the stepper motor can achieve rotor positioning when stopping.

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