The servo motor can control the speed and position accuracy very accurately, and can convert the voltage signal into torque and speed to drive the control object.
The servo motor rotor speed is controlled by the input signal and can react quickly.
It is used as an actuator in the automatic control system, and has the characteristics of small electromechanical time constant, high linearity, and starting voltage, which can receive the received electrical signal.
Converted to an angular displacement or angular velocity output on the motor shaft. Divided into two major categories of DC and AC servo motor.
Its main feature is that when the signal voltage is zero, there is no rotation phenomenon, and the rotation speed decreases uniformly with the increase of torque.
1. Accuracy: closed-loop control of position, speed and torque is realized; the problem of stepper motor out-of-step is overcome;
2. Speed: good high-speed performance, generally rated speed can reach 2000 ~ 3000 rpm;
3. Adaptability: strong anti-overload capability, able to withstand loads three times the rated torque, especially suitable for occasions with instantaneous load fluctuations and fast start requirements;
4. Stable: The low-speed operation is stable, and the stepping operation phenomenon similar to the stepping motor will not occur during low-speed operation. Applicable to occasions with high-speed response requirements;
5. Timeliness: The dynamic response time of motor acceleration and deceleration is short, generally within tens of milliseconds;
6. Comfort: heat and noise are significantly reduced.
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1. The servo system is an automatic control system that enables the output controlled quantities such as the position, orientation, and state of the object to follow any changes in the input target (or given value).
2. The AC servo motor is also a brushless motor, which is divided into synchronous and asynchronous motors. Synchronous motors are generally used in motion control. It has a large power range and can achieve a large power. High inertia, low maximum rotational speed, and decreases rapidly with increasing power. Therefore, it is suitable for applications that operate smoothly at low speeds.
3. The rotor inside the servo motor is a permanent magnet. The U/V/W three-phase electricity controlled by the driver forms an electromagnetic field, and the rotor rotates under the action of this magnetic field.
At the same time, the encoder that comes with the motor feeds back the signal to the driver, and the driver compares the feedback value with the target value and adjusts the rotation angle of the rotor.
The accuracy of the servo motor is determined by the accuracy (number of lines) of the encoder.
The functional difference between AC servo motor and brushless DC servo motor: AC servo is better, because it is controlled by sine wave, and the torque ripple is small.
DC servos are trapezoidal waves. But DC servo is simpler and cheaper.
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Servo motors are used inside closed loops.
That is to say, it transmits signals to the system at any time, and at the same time corrects its own operation with the signals given by the system.
Servo motors can also be controlled by a microcontroller.