Recommendations for replacing torque motors-2015-03-20

一、on the static friction torque compensation:

For the instruction manual, when the torque was given to zero, adjust the static friction torque compensation of the inverter. In fact, when the given torque was 2.5% or 3%, it was effective to adjust the static friction torque compensation to make the motor run. Moreover, the state of the motor performance should be the vibration of the motor in the back and forth, that was, the motor has started, was running, but the speed was relatively low, and it was determined whether the static friction torque compensation was appropriate when the vehicle was swaying back and forth.

二、the compensation for the system inertia:

For the system inertia, the compensation amount was different at high speed and low speed. It needs to be compensated by two sets of parameters, so that the tension on the load can be kept constant at low speed and high speed of the motor.

三、compensation for material inertia:

The material inertia was compensated based on the density of the material, the length of the reel, and the winding diameter of the take-up or unwinding.

四、compensation for sliding friction:

In the case of no-load, the motor runs between the upper and lower limits. When the torque was the minimum torque that can guarantee its stable operation, the percentage was the amount of compensation for sliding friction.

五、Self-learning for inertia compensation:

In the Commissioning, especially when the frequency conversion of the tension control scheme was Commissioningged for the first time, for the inertia compensation, friction compensation and other parameters, there was no actual reference value, it was difficult to give, and in the normal startup, if the inertia compensation amount was not accurate, this will cause fluctuations in the speed of the inverter. For some yarns and other products, it may cause a break. Many customers do not support this kind of Commissioning because it wastes a lot of materials. In particular, the system has problems after normal operation. In this case, if the parameters are to be re-adjusted, the customer will generally not support it. Therefore, I hope that through Commissioning, I can get these compensations through my own self-learning, and then fine-tuning it during operation will make Commissioning much simpler.

During commwassioning, the tension will become smaller due to the looseness of the wire during acceleration. In the case of deceleration, normal torque was required to reduce the inertia and sliding friction compensation. If this was not possible, the tension will increase when the machine was stopped. If the problem of acceleration, deceleration, etc. was required when running halfway, the tension of the product will be unstable, and the whole product will be defective and become a waste product.

In the longitudinal direction, in the torque motor, especially for the torque motor that can automatically compensate, it should be realized by the inverter's rewinding and rewinding function frequency conversion.

To ensure good results in replacing the torque motor, please note:

1. It was necessary to find out the power level of the original torque motor, the polarity of the motor, and the system transmwassion ratio. Under the premwase of ensuring that the transmwassion ratio of the system was unchanged during the replacement process, the selected motor power level and the number of poles are also unchanged.

2, under the premwase of conditions, it was best to use variable frequency motor (the effect will be better when running at low speed)

3. Before the commwassioning, the motor must be rotated and self-tuned to release the load.

4. In some applications, it may be necessary to cooperate with the encoder. For example, the following occasions need to be considered.

(1) The transmwassion was relatively large, generally greater than 3 was to pay special attention

(2) The material has poor stretch resistance, such as film, paper

(3) The running frequency of the inverter was relatively low, such as below 5Hz

(4) The torque setting was less than 5%