Electric Motor Manufacturer – Servo Motor Speed Control Principle
The Electric Motor Manufacturer stated that the servo motor speed is controllable and the position accuracy is high, and the voltage signal can be converted 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, there is no rotation phenomenon when the signal voltage is zero, and the rotation speed decreases uniformly with the increase of torque.
Both speed control and torque control are controlled by analog quantities. Position control is controlled by pulse. The specific control method should be selected according to the actual requirements and what kind of motion function is satisfied.
If there is no strict requirement on the speed and position of the motor, as long as a constant torque is output, of course, the torque mode is used. If there is a certain accuracy requirement for position and speed, and the real-time torque is not very concerned, it is not convenient to use the torque mode, and the speed or position mode is better. If the host controller has a better closed-loop control function, the speed control effect will be better. If the requirements are not very high, or there is basically no real-time requirement, there is no high requirement for the upper controller by the position control method.
When there is a high requirement for dynamic performance in motion, the motor needs to be adjusted in real time. Then if the controller itself is slow, it is controlled by position. If the controller is running faster, you can use the speed mode to move the position loop from the drive to the controller, reducing the workload of the drive and improving efficiency (such as most mid-to-high-end motion controllers); if there is better upper control It can also be controlled by torque, and the speed loop is also removed from the drive. This is generally only a high-end dedicated controller to do this, and at this time, no servo motor is needed at all.
Generally speaking, the driver control is good, each manufacturer said that he did the best, but now there is a relatively straightforward comparison method called response bandwidth. When torque control or speed control, give him a square wave signal through the pulse generator, so that the motor continuously rotates and reverses continuously, and the frequency is constantly increased. The oscilloscope displays a sweep signal when the envelope is When the vertex reaches 70.7% of the highest value, it means that it has lost the step. At this time, the frequency of the frequency can show who the product is. The general current loop can be above 1000Hz, and the speed loop can only be used for dozens. hertz.
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