After the motor end of the position feedback cable is temporarily wrapped with insulating tape, the plug is connected, and then the power is applied. The cable is repeatedly driven, and the motor no longer vibrates. At this point, I thought the problem was solved, and it was judged to be an electrical fault. I asked the operator to operate the Y-axis repeatedly. However, after about ten minutes, the Y-axis motor vibrates again (in a stationary state). It can be clearly seen through the transmission wheel that the motor is in a frequent dynamic correction process. I think, this verified my original idea, that is, the problem is on the drive, so I repeatedly tested and adjusted the drive (ie, the servo unit), and repeatedly power off and power on, but the motor vibration still disappeared. No, including changing its gain, adjusting the zero drift, etc., no effect. Later, it was suspected that the motor was loaded, so the worm gear in the worm gear pair was removed, so that the motor did not have any load. When the power was turned on, the motor was still vibrating as it was. I don't want to adjust the drive anymore, because the rotation of the motor is made by the command. At this time, the NC does not give any command. The motor should be stationary. The reason why the motor rotates must be that the driver has received the command voltage. . After turning, it is immediately corrected back in the opposite direction. This is because the NC does not receive any motion commands from the operator and is corrected by the position encoder of the motor. So the problem is clearly in the command loop of the drive, the servo unit. In the absence of a multimeter and the inability to measure, the servo end of the Y-axis command voltage cable is removed and energized. Sure enough, the motor is stationary and there is no vibration. However, it is impossible to add the command voltage when the machine is in normal use. Then, is the NC's own instruction loop drifting, or the driver receives the external interference? After testing, changing the offset value of the NC command loop voltage proves that it is not NC. The command voltage drifts, so it can be determined that this jitter of the motor is due to the external interference received by the driver. Finally, by grounding the NC end of the Y-axis command cable, the interference is eliminated and the motor jitter is solved. Afterwards, according to the relevant technical personnel of the factory, when the machine tool arrived at the factory, the Y-axis command cable of the machine tool was not processed. Why didn’t this happen at the time? I think the most fundamental reason is still in the Y-axis of the machine tool. On the transmission mechanism. The Y axis of the machine tool is driven by a worm gear and worm gear. According to the general design principle: 1. The worm gear should be made of two different materials, such as steel brass. Second, the meshing application of the worm wheel and the worm is used to adjust the elastic device. However, the actual situation is that the worm wheel and the worm of the Y-axis of the machine tool are both steel parts, and serious scratches are found, and there is no adjustment device. In this way, when the Y-axis motor is static, the load is very uneven. It does not matter when running dynamically, but it is not normal when it is static. For long-term use, the static working point of the axis drive is offset, and each working parameter is different. Changes, the external disturbances are naturally introduced, so there is such a fault. Therefore, the drive of the CNC machine tool is a complete chain from the servo drive mechanism of the NC drive. If you want to work on one axis of the machine tool, you must take care of each link of the chain and coordinate and match each other. This problem should be solved in the initial design stage of the machine. (Finish) Wall Mount Kitchen Faucet,Single Hole Kitchen Faucet,Best Kitchen Sink Faucets,Single Handle Kitchen Faucet Kaiping City Yibiao Sanitary Ware Co., Ltd. , https://www.aolifaucet.com