Reasons for incorrect positioning of stepping motor

by:V&T Technologies     2020-01-11
Why is the stepper motor position incorrect? In view of these problems, this paper summarizes the causes of incorrect positioning of stepping motor and puts forward corresponding solutions. One. When the direction changes, the pulse is lost, resulting in incorrect position. When the direction changes, the pulse will be lost, which is consistent in any direction, but after the direction changes, the deviation will accumulate immediately, and the greater the degree of digital bias; Solution: The Universal stepping driver has certain requirements for the opposite direction and pulse signals, for example, the direction signal is on the rising or falling edge of the first pulse (Different drives have different requirements) , Determine the first few microseconds, otherwise the pulse will run at an angle opposite to the actual desired turn. Finally, the fault phenomenon is getting more and more biased, and the smaller the subdivision is, the more obvious it is. The solution is to use software to change the logic or delay of the pulse. Second, the initial speed is too high, the acceleration is too large, and sometimes the loss is caused. Solution: due to the characteristics of the stepping motor, the initial speed cannot be too high. Especially when the load inertia is large, it is recommended that the initial speed is lower than 1r/s, so that the impact is small and the acceleration is too large. It also has a great impact on the system and is easy to overshoot. Third, the environmental interference caused by the failure of the controller or driver leads to incorrect positioning. Solution: appropriately increase the motor current and increase the driver voltage (Please note the optional Drive)To select a motor with higher torque. Interference from the system can cause the controller or driver to fail. We can only find a way to find the interference source and reduce its interference capability (Such as shielding, increasing separation distance, etc) , Cut off the transmission path, and improve their anti-interference, the common measures are as follows: 1 with double shielded shielded wire instead of ordinary wire. The signal lines in the system are separated from large current or large voltage variation lines to reduce electromagnetic interference capability. 2 use a power filter to filter out interference waves from the power grid. Under allowable conditions, a power filter is added to the input of each large power device to reduce interference between devices in the system. 3 it is better to use optical isolation equipment for signal transmission between devices. Under allowable conditions, pulse and direction signals are preferably transmitted through differential mode plus photoelectric isolation. In the inductive load ( For example, both ends of electromagnetic relays and solenoid valves are equipped with RC absorption or fast discharge circuits. If the operating frequency is higher than 20 KHZ, the inductive load will generate 10 ~ 100 times of the peak voltage at the beginning. TAG stepper motor positioning
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