What are the advantages of stepper motors?
The stepper motor is now widely known and applied by most people, which is of course determined by its own advantages and performance. Especially the step value of the motor is not affected by various interference factors. Such as the magnitude of voltage, the value of current, waveform, temperature changes, etc.
Also, the error of the stepper motor during operation will not accumulate for a long time. Generally, there is always a certain error between the angle that a motor rotates at each step and the theoretical step distance. From a certain step to any step, there is also a certain cumulative error. However, the cumulative error for each revolution is zero, so the cumulative error of the step distance is not accumulated over a long period of time.
One of the advantages of a stepper motor is its good control performance. Starting, stopping, and flipping are all completed within a few pulses. When operating within a certain frequency range, no movement mode will lose a step. So, stepper motors are widely used in CNC machine tools. The application of motors in CNC machine tools is also the most extensive. In addition, motors also have these advantages: high output torque at low to medium levels, open-loop control, and high cost-effectiveness, which is only about a quarter of that of servo motors. Therefore, motors with high cost-effectiveness are also the reason why most people choose them. But in addition to most of the advantages of the motor, it also has some small drawbacks, such as high vibration, high heat generation, poor high-speed performance, the possibility of losing step, and the need for a dedicated driver during operation.
Cyril
03-291. The rotation angle of the motor is proportional to the number of pulses. 2. When the motor stops rotating, it has the maximum torque (when the winding is excited). 3. Due to the accuracy of each step being between 3% and 5%, and not accumulating errors from one step to the next, it has good positional accuracy and motion repeatability. 4. Excellent start stop and reverse response. 5. Due to the lack of brushes and high reliability, the lifespan of the motor only depends on the lifespan of the bearings. 6. The response of the motor is only determined by digital input pulses, so open-loop control can be used, which makes the structure of the motor relatively simple and cost-effective. 7. Simply connecting the load directly to the motor shaft can also achieve extremely low speed synchronous rotation. 8. Due to the speed being proportional to the pulse frequency, there is a relatively wide range of rotational speeds. Compared to ordinary motors, stepper motors can achieve open-loop control, which controls the angle and speed of the stepper motor through the number and frequency of pulses input from the driver signal input end, without the need for feedback signals. However, stepper motors are not suitable for long-term operation in the same direction, as they are prone to burning out the product. Therefore, it is usually better to operate frequently over short distances during use. Compared to servo motors, feedback control is achieved through the installation of a rotary encoder inside the servo motor. The torque that the servo motor can achieve is higher than that of the stepper motor, but the price is relatively high. Therefore, it is recommended to use a stepper motor when the torque can be met. Stepper motors are used in conjunction with drivers, and many drivers support subdivision function, which achieves very small step angles and more precise control.
0ReplyGilbert
03-29The stepper motor itself is used for position control, especially when the speed is not very high. The torque and accuracy are both quite good, the control is simple, and it is also cheap.
0Reply
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