How to calculate the servo motor frequency_servo motor frequency response

How to calculate the frequency of servo motor

The frequency of a servo motor usually refers to the frequency of the motor's rotation, which can also be understood as the frequency of the pulse signal sent by the controller to the motor. Generally speaking, the frequency calculation of a servo motor involves factors such as the rated speed of the motor and the pulse output mode of the controller. The specific calculation method is as follows:

First, determine the rated speed of the servo motor, which is the speed at which the motor rotates at rated voltage and rated current. This value can usually be found in the motor's specification sheet.

Then, determine the pulse output mode of the controller, that is, the width and number of each pulse. Usually, the controller will output a certain number of pulse signals, and the width of each pulse can also be adjusted in the controller parameter settings.

Next, based on the rated speed of the motor and the pulse output mode of the controller, the number of pulse signals sent to the motor per second, that is, the control frequency of the motor, can be calculated.

The specific calculation formula is:

Control frequency = rated speed × number of pulses ÷ 60

The rated speed is in revolutions per minute (RPM), and the number of pulses is the number of pulses sent per revolution.

It should be noted that the actual rotation speed of the motor may be slightly deviated by factors such as load, so it needs to be adjusted according to actual conditions in actual applications.

Servo motor frequency response

The frequency response of a servo motor refers to the servo system's ability to respond to changes in the frequency of the control signal. The better the frequency response of the servo motor, the stronger the servo system's ability to control frequency changes, and the faster it can follow changes in the control signal, thus achieving higher precision and more stable motion control.

Generally speaking, the frequency response of a servo motor is affected by multiple factors, including the characteristics of the servo motor itself, the response speed of the controller, the accuracy of the sensor, etc. The following are some of the main factors that affect the frequency response of a servo motor:

Inertia characteristics of servo motors: The rotational inertia of a servo motor determines its acceleration and deceleration, thus affecting its frequency response capability. Generally speaking, the smaller the rotational inertia, the stronger the frequency response capability of the servo motor.

Sensor accuracy: The servo system needs to use sensors to monitor the movement status of the motor in real time. If the sensor accuracy is not high, it may affect the frequency response capability of the servo system.

Controller response speed: The faster the controller response speed, the stronger the frequency response capability of the servo system. Therefore, a high-speed controller can usually achieve a higher frequency response.

Bandwidth of the motor driver: The bandwidth of the motor driver determines how quickly it responds to changes in the frequency of the control signal. Generally speaking, the wider the bandwidth, the stronger the frequency response capability of the motor driver.

In short, the frequency response of the servo motor is one of the important factors affecting the motion control accuracy and stability of the servo system, and it needs to be fully tested and debugged in practical applications.