CHAPTER 5 SERVO ADJUSTMENT

(2) Checking the vibration suppressing anti resonance frequency

Using the PC Loader

Use the servo analyze function to check the vibration suppressing anti resonance point.

5

Gain

[dB]

Vibration

suppressing anti

resonance point

(Note 1)

Frequency [Hz]

Resonance

point

(Note 2)

Note 1

Note 2

The vibration suppressing anti resonance point may not be observed with the servo

analyze function in the following machine configuration.

 Machine with large friction

 Machine with relatively large mechanical loss such as reduction gear and ball screw

Use the notch filter for the resonance point.

What are the resonance point and vibration suppressing anti resonance point?

Vibration of the machine includes the "resonance point" and "vibration suppressing anti

resonance point."

The "resonance point" and "vibration suppressing anti resonance point" mentioned

here are machine characteristics viewed from the motor.

"Resonance point": Frequency at which the motor vibrates without arm tip vibration

"Vibration suppressing anti resonance point": Frequency at which the arm tip vibrates

without vibration of the motor shaft

In general, the vibration suppressing anti resonance frequency is less than the

resonance frequency.

5-32 Special Adjustment (Vibration Suppression)