Motors play a key role in many motion control functions […]
Motors play a key role in many motion control functions in many industries, including packaging, food and beverage, manufacturing, medical and robotics. We can choose from several motor types based on function, size, torque, accuracy and speed requirements.
As we all know, the motor is an important part of the transmission and control system. With the development of modern science and technology, the focus of the motor in practical applications has begun to shift from the simple transmission to the complicated control; especially the speed and position of the motor. , precise control of torque. However, the motor has different designs and driving methods depending on the application. At first glance, it seems that the selection is very complicated, so in order to make a basic classification according to the use of the rotating electric machine. Below we will gradually introduce the most representative, most commonly used and most basic motors in the motor - control motors and power motors and signal motors.
The control motor is mainly used in precise speed and position control, and is used as an "actuator" in the control system. Can be divided into servo motor, stepper motor, torque motor, switched reluctance motor, DC brushless motor and so on.
The servo motor has DC and AC. The earliest servo motor is a general DC motor. When the control accuracy is not high, the general DC motor is used as the servo motor. With the rapid development of permanent magnet synchronous motor technology, most servo motors refer to AC permanent magnet synchronous servo motors or DC brushless motors.
The difference between a stepper motor and a normal motor is mainly in the form of its pulse drive. It is this feature that the stepper motor can be combined with modern digital control technology. However, the stepping motor is not as good as the traditional closed-loop controlled DC servo motor in terms of control accuracy, speed variation range and low-speed performance; therefore, it is mainly used in applications where the accuracy requirements are not particularly high. Stepper motors are widely used in various fields of production practice because of their simple structure, high reliability and low cost. Especially in the field of CNC machine tools, because stepper motors do not require A/D conversion, The digital pulse signal is directly converted into an angular displacement, so it has been considered as the most ideal CNC machine tool actuator.