What is the structure and nature of the servo motor
In fact, a servo motor is strictly a motor system. A single motor cannot be called a servo motor. The system composed of a motor, a sensor, and a controller can achieve more accurate position, speed or torque output, which we call It has a servo motor system. Below we analyze and understand the structure and nature of the servo motor
The word servo is derived from the Latin "Servus", which means slave, and here means to perform actions according to commands. As we mentioned earlier, the biggest feature of the Jact servo motor is that it can accurately control the speed, position, torque, etc. as required. So how is this kind of more precise control achieved?
Then we will introduce the three-loop control of the servo motor, the loop is the negative feedback regulation system.
The innermost loop is a current loop directly performed inside the servo drive. The Hall-effect sensor detects the drive current of the drive to each phase of the motor and performs PID adjustment. The current loop is mostly used to control the motor torque, and the response is the fastest in the torque mode.The middle loop is a speed loop, which controls the motor by detecting the signal output of the motor encoder.
The outermost loop is the position loop, which can be constructed between the drive and the motor encoder or between the external controller and the motor encoder or the final load according to the actual situation.
The reason why it becomes a three-loop control is because they are connected to each other. The current loop will quickly and accurately control the motor according to the instructions of the speed loop. The speed loop will quickly and accurately control the motor according to the command speed of the position loop, so that it is not affected by the load, and quickly track the change of the command speed. The position loop compares the detection signal with the given value, and outputs the command speed of the speed loop, so that the position of the actuator is consistent with the command position. The structure and nature of the Jact servo motor.