EnglishQuestions of stepper motors
How to correctly choose servo motors and stepper motors?
Answer: It mainly depends on the specific application. Simply put, it is necessary to determine: the nature of the load (such as horizontal or vertical load, etc.), requirements for torque, inertia, speed, accuracy, acceleration and deceleration, etc., upper control requirements (such as requirements for port interface and communication), and whether the main control method is position, torque or speed. The power supply is DC or AC power, or battery powered, and the voltage range. Based on this, determine the model of the motor and the accompanying driver or controller.
2. Choose stepper motor or servo motor system?
Answer: In fact, the choice of motor should be based on the specific application conditions, each with its own characteristics.
3. How to use a stepper motor driver?
Answer: According to the current of the motor, use a driver with a current greater than or equal to this. If low vibration or high precision is required, a subdivided driver can be used. For high-torque motors, use high-voltage drives as much as possible to obtain good high-speed performance.
4. What is the difference between 2-phase and 5-phase stepper motors, and how to choose?
Answer: The 2-phase motor has low cost, but the vibration is larger at low speed and the torque decreases quickly at high speed. The 5-phase motor has less vibration and good high-speed performance. It is 30~50% faster than the 2-phase motor. It can replace the servo motor in some occasions.
5. When to choose DC servo system? What is the difference between it and AC servo?
Answer: DC servo motors are divided into brushed and brushless motors. Brush motors have low cost, simple structure, large starting torque, wide speed range, easy control, and require maintenance, but they are easy to maintain (replace carbon brushes), produce electromagnetic interference, and have environmental requirements. Therefore it can be used in cost-sensitive general industrial and civil applications. Brushless motors are small in size, light in weight, large in output, fast in response, high in speed, small in inertia, smooth in rotation and stable in torque. The control is complex and easy to realize intelligence. Its electronic commutation method is flexible and can be square wave commutation or sine wave commutation. The motor is maintenance-free, has high efficiency, low operating temperature, very small electromagnetic radiation, long life, and can be used in various environments.
6. What should we pay attention to when using motors?
Answer: The following checks must be made before powering on and running: 1) Whether the power supply voltage is appropriate (overvoltage is likely to cause damage to the drive module); the +/- polarity of the DC input must not be connected incorrectly, and whether the motor model or current setting value on the drive controller is appropriate (not too large at the beginning); 2) The control signal lines must be connected reliably, and it is best to consider shielding issues at industrial sites (such as using twisted pairs); 3) Don’t connect all the wires that need to be connected at the beginning. Only connect the most basic system. After it runs well, connect it gradually.
