There are many types of stepper motors, and PM stepper motors are just one of them. Now, what are the advantages of PM stepper motors?

The PM stepper motor uses a stepper motor as the source of rotation power and converts the rotation motion into linear motion through a screw drive. The precision ball PM stepper motor can replace the air cylinder in some occasions to achieve the advantages of accurate positioning, controllable speed and high precision. PM stepper motors are widely used in many high-precision fields, including manufacturing, precise calibration, precise fluid measurement and precise position movement.

When the step angle of the PM stepper motor cannot meet the conditions of use, the subdivision driver can be used to drive the stepper motor. The principle of the subdivision drive is to change the magnitude of the adjacent (A, B) current to change the composite magnetic field. Controlling the angle of stepping motor power amplification is an important part of the drive system. The torque of a PM stepper motor at a certain speed depends on its dynamic average current, not a static current. The greater the average current, the greater the motor torque. In order to connect a larger average current, the drive system needs to overcome the back electromotive force of the motor as much as possible. Therefore, different driving methods are adopted for different occasions. So far, the driving methods are generally as follows: constant voltage, constant voltage series resistance, high and low voltage drive, constant current, subdivision, etc.

In order to improve the dynamic performance of the motor as much as possible, signal distribution and power amplification are used to form the driving power source of the PM stepper motor. The pulse frequency at which the PM stepper motor can start normally during air cutting. If the pulse frequency is higher than this value, the motor can start normally and may lose step or stall. Under load, the starting frequency should be lower. If the PM stepper motor is to rotate at a high speed, the pulse frequency should have an acceleration process, that is, the starting frequency is low, and then the acceleration is increased to the required high frequency according to a constant acceleration. PM stepper motors are usually two-phase, have a small torque and volume, and the step angle is usually 75 degrees or 15 degrees.