How to correctly select servo motor and stepping motor?

by:V&T Technologies     2020-01-26
1. How to correctly select servo motor and stepping motor? Mainly depending on the specific application situation, simply to determine: the nature of the load (Such as horizontal or vertical load, etc) , Torque, inertia, speed, precision, acceleration and deceleration, etc. Upper control requirements (Such as port interface and communication requirements) , The main control mode is position, torque or speed. Whether the power supply is DC or AC, or battery-powered, voltage range. Based on this, the model of the motor and the equipped driver or controller is determined. Stepping Motor animation figure 2, choose stepping motor or servo motor system? In fact, what kind of motor to choose should be determined according to the specific application situation, each with its own characteristics. Please see the table below, naturally understand. Stepping Motor system servo motor system torque range small torque (Generally below 20Nm)Small, medium and large, full range speed range low ( Generally below 2000 RPM, large torque motor is less than 1000 RPM)High (Up to 5000 RPM) , DC servo motor can reach 1 ~ The 20 thousand RPM control mode is mainly a diversified and intelligent control mode for position control. The position/speed/Torque Mode is smooth and vibrates at low speed (However, it can be significantly improved with a subdivided driver) Well, the running smoothing accuracy is generally low, and the subdivision drive is higher (Depending on the resolution of the feedback device) When the moment frequency characteristic is high speed, the moment drops fast and the moment characteristic is good, and when the overload characteristic is hard, the out-of-step can be 3 ~ 10x overload (Short-term) Most feedback methods are open-loop control or encoder to prevent out-of-step closed-loop mode. Encoder feedback encoder type-Photoelectric rotary encoder (Incremental/absolute value) , Rotary transformer type response speed is generally fast and vibration resistance is generally good (Rotary transformer type can withstand vibration) High temperature rise, high operating temperature, General maintainability, good maintenance, low price, high 3, how to use stepper motor driver? According to the current of the motor, a driver greater than or equal to this current is equipped. If low vibration or high precision is required, a subdivision driver can be equipped. For high torque motors, use high voltage drivers as much as possible to obtain good high speed performance. What is the difference between 4,2 phase and 5 Phase stepping motors and how to choose them? The cost of the 2-phase motor is low, but the vibration at low speed is large, and the torque at high speed drops quickly. The 5-phase motor has less vibration and good high-speed performance, which is 30 ~ higher than the speed of the 2-phase motor ~ 50%, can replace servo motor in some occasions. 5. When to choose DC servo system, what is the difference between it and AC Servo? DC servo motors are divided into brush and brushless motors. Brush Motor has low cost, simple structure, large starting torque, wide speed regulation range, easy control, need maintenance, but convenient maintenance (Carbon brush), Produce electromagnetic interference, have requirements on the environment. Therefore, it can be used in cost-sensitive ordinary industrial and civil occasions. Brushless Motor has small volume, light weight, large output, fast response, high speed, small inertia, smooth rotation and stable torque. The control is complex, easy to realize intelligence, and its electronic commutation method is flexible, which can be square wave commutation or sine wave commutation. The motor is maintenance-free, has high efficiency, low operating temperature, small electromagnetic radiation and long service life, and can be used in various environments. AC servo motor is also a brushless motor, which is divided into synchronous motor and asynchronous motor. At present, synchronous motor is generally used in motion control. Its power range is large and it can achieve great power. Large inertia, low maximum rotation speed and rapid reduction with increased power. Therefore, it is suitable for applications with low speed and smooth operation. TAG stepping, servo motor, motor, servo
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