The basic principle of integrated external drive linear motor
Release Date：2023-06-06
Author：LEESN
The rotor of the integrated externally driven linear stepper motor is a permanent magnet. When the current flows through the stator winding, the stator winding generates a vector magnetic field. The magnetic field will drive the rotor to rotate at a certain Angle, so that the direction of a pair of magnetic fields of the rotor is consistent with that of the stator. When the stator's vector magnetic field rotates an Angle, the rotor also rotates an Angle with the magnetic field. With each input of an electrical pulse, the motorized rotor turns an Angle and moves forward. The angular displacement of its output is proportional to the number of input pulses, and the speed is proportional to the pulse frequency. Change the order in which the windings are energized, and the motor reverses. Therefore, the number of pulses, frequency and the electrification sequence of each phase winding of the motor can be controlled to control the rotation of the stepper motor.
The screw and the motor are integrated as a motor shaft, and engage with the screw through an external drive nut and screw outside the motor in a certain way to prevent the screw nut from turning relative to the motor, so as to achieve linear movement. The result is a greatly simplified design that enables precise linear motion in many applications using externally driven linear stepper motors without the installation of external mechanical linkages.
