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The number of phases of linear stepper motor and how to maintain torque running performance

The number of phases of linear stepper motor and how to maintain torque running performance

  • Categories:Industry News
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  • Time of issue:2021-03-26
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(Summary description)The linear stepper motor is an actuator that converts electrical pulses into angular displacement.

The number of phases of linear stepper motor and how to maintain torque running performance

(Summary description)The linear stepper motor is an actuator that converts electrical pulses into angular displacement.

  • Categories:Industry News
  • Author:
  • Origin:
  • Time of issue:2021-03-26
  • Views:0
Information

The linear stepper motor is an actuator that converts electrical pulses into angular displacement. When the linear stepper motor receives a pulse signal, it rotates the linear stepper motor by a fixed angle (called "step angle") in the set direction, and its rotation runs step by step at a fixed angle.

The angular displacement can be controlled by controlling the number of pulses, so as to achieve the purpose of accurate positioning; at the same time, the speed and acceleration of the motor rotation can be controlled by controlling the pulse frequency, so as to achieve the purpose of speed regulation and positioning. It is widely used in large and medium-sized CNC equipment with high resolution, such as engraving machines, crystal grinders, medium-sized CNC machine tools, computerized embroidery machines, packaging machinery, fountains, glue dispensers, and cutting and feeding systems.

The number of phases of a linear stepper motor refers to the number of coil groups inside the motor, and two-phase, three-phase, four-phase, and five-phase stepper motors are commonly used. The number of phases of the motor is different, and the step angle is also different. Generally, the step angle of a two-phase motor is 1.8 degrees, a three-phase motor is 1.2 degrees, and a five-phase motor is 0.72 degrees. When there is no subdivision drive, users mainly rely on selecting stepping motors with different phase numbers to meet the step angle requirements. If a subdivision driver is used, the number of phases will become meaningless, and the user only needs to change the subdivision number on the driver to change the step angle.

After the driver is subdivided, it will make a qualitative leap in the running performance of the motor, but all of this is produced by the driver itself, and has nothing to do with the linear stepper motor and the control system. When using, the only thing the user needs to pay attention to is the change of the step angle of the stepper motor, which will affect the frequency of the step signal sent by the control system, because the step angle of the stepper motor will change after the subdivision. If it is small, the frequency of the step signal must be increased accordingly. Take a 1.8-degree screw stepper motor as an example: the step angle of the driver is 0.9 degrees in the half-step state, and the step angle is 0.18 degrees in the tenth subdivision. In this way, when the motor speed is required to be the same, the control system The frequency of the step signal sent is 5 times that of half-step operation in ten subdivisions.

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