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Frequently Asked Questions about Application Technology of Tamagawa AC Servo Products

Time:2021-06-21Source: Aerte


1. What is the difference between low inertia and high inertia of Tamagawa servo motors?

Answer: Low inertia and high inertia refer to the moment of inertia of the servo motor. The large inertia of the servo motor has a strong load capacity, and vice versa. Similarly, a small inertia of a servo motor will result in strong responsiveness, and a large inertia will result in poor responsiveness.

2. What are the Tamagawa servo control methods?

Answer: Three control methods: position control, speed control, and torque control.

3. What is the difference between position control and speed control in Tamagawa servo control mode?

Answer: The position control in the Tamagawa servo control mode refers to the high-speed pulses sent by the system to control the position, speed and direction of the servo motor. The position control motor has a resolution of 131072 per revolution (the encoder is 17 bits). If the encoder is 2500 lines, the high position is 2500*4=10000. The speed control is to control the speed and direction of the servo motor with high precision and stability through the voltage analog speed command (-10V~+10V DC).

4. The servo motor does not receive the command pulse from the system, why does it vibrate abnormally?

Answer: After the customer has installed and connected the servo, everything is normal after power-on, and no alarm occurs, but the motor vibrates abnormally after the servo is turned on, sometimes even loud screams. After the servo is turned on, a locking force will be output to stop the servo motor at the current position. If the motor's power lines U, V, W are connected incorrectly, or the connection is loose, or the initial value gain is too large, then this locking force will make the servo motor Vibration occurs.

5. Where is the download address of Tamagawa servo data?

Answer: Tamagawa servo data can be downloaded from Aierte official website, Baidu search: Aierte, website: http://www.contmp.com/.

6. What is the purpose of the encoder feedback on the Tamagawa servo drive for A-phase, B-phase, and Z-phase pulses?

Answer: The Z-phase pulse of Tamagawa Servo Encoder is a special pulse signal, only one pulse is sent out every time the servo motor rotates, and it is generally used for zero return of the servo. When the servo is under speed control or torque control, setting the number of A and B phase pulses can determine the position and speed of the servo motor.

7. What are the current series of commonly used servo drives in Tamagawa?

Answer: TAD8810: The power range of the drive motor is 3W~100W.

TAD8811: The driving motor power range is 30W~750W.

8. What is the name of Tamagawa's driver debugging software?

Answer: The name of the Tamagawa debugging software is Motion Adjuster, which is provided free of charge, with the new version 1.5.

9. Why does the motor shake and the screw vibrate when the screw is stopped?

Answer: The lead screw jitters when it stops at low speed or high speed (3000rpm), which is generally caused by the motor servo position loop and speed loop gain. It is recommended to adjust the load inertia value of 51, 52, 53, 59. When the motor still has high frequency vibration, Then adjust the low-pass filter to reduce vibration.

10. Why is the direction of the motor just opposite, but the system signal is correct?

Answer: Modify parameter 72 to set the direction of motor rotation.

11. What are the setting parameters generally used by Tamagawa servo drives?

Answer: 1) 31#, control mode

    2) 74#, position command selection

    3) 120#, pulse mode

    4) 121#, electronic gear molecule

Decrease 51, 52, 53 (if the motor is noisy at first)

12. How does Tamagawa Servo Drive constitute an absolute position control system?

Answer: To make an absolute value control system for Tamagawa servo drive, the motor must use 17-bit absolute value, or 23-bit absolute value, 2500 lines or 17-bit incremental type will not work. The servo drive must also be connected to a battery. The battery specification recommends Toshiba ER6V. Of course, as long as it is 3.6V and the capacity is more than 1000mA, the TAD8811 drive parameter 140 needs to be changed to 1. The encoder of the absolute position control system not only detects the position of the motor within a circle, but also memorizes the number of rotations of the motor. Regardless of whether the servo drive power is on or off, the absolute position control system can detect the current position of the servo motor.

13. Which series of Tamagawa servo motors are there, and what are the differences?

Answer: Tamagawa servo motors have TBL-i I, TBL-i II, TBL-i III, TBL-i Mini series.

    TBL-i I refers to the early products of Tamagawa. The number of encoder lines mainly includes 2000, 2048, and 2500 lines.

    TBL-i II is a technical upgrade in TBL-i I, and the volume is smaller. The number of encoder lines is mainly 2500, 17-bit absolute value.

The TBL-i III motor body has been redesigned. The number of magnetic poles is 10 poles, and the encoder adopts 23-bit absolute value.

The body of the TBL-i Mini motor has been redesigned, with a smaller volume, which may be the smallest size in the industry.

14. How to define the current loop, speed loop and position loop on the drive?

Answer: The current loop uses the current signal as the control link of the feedback signal.

    The speed loop is a control link with the speed signal as the feedback signal.

    The position loop is a control link with a position signal as a feedback signal.

The current loop is an inner loop, which plays a role in controlling the mechanical characteristics of the system in the servo system, and its feedback component is generally a current transformer;

The speed loop is outside the current loop, which mainly controls the speed, and its feedback element is generally an encoder;

The position loop is outside the speed loop and mainly plays a role of position control. Its feedback components are generally encoders, grating scales, resolvers and so on.