A zero-position setting and recovery method for motor rotation displacement

Abstract

The invention discloses a motor rotation displacement's zero position setting and restoring method, comprising the following steps: first, setting the maximum position in the positive direction of the system; second, when the system is working properly, sending a command to a microcontroller or closing the switch, wherein the microcontroller performs the zero position setting operation; third, when the system is powered on again, accessing the angle information of a magnetic encoder from the memory by the microcontroller and collecting the angle information of the current position of the magnetic encoder and comparing with the maximum position in the set positive direction; and fourth, when the motor is in a negative direction relative to the zero point, returning to the zero point and running in the positive direction; when the motor is in a positive direction relative to zero point, returning to the zero point and running in the negative direction. The motor rotation displacement's zero position setting and restoring method of the invention has the advantages of a low cost, small installation space, low complexity and strong stability, and can realize the absolute positioning without the need of an origin point switch, and requires no external battery to supply power.

Description

technical field [0001] The invention relates to the field of motor control, in particular to a method for setting and restoring the zero position of the rotational displacement of a motor. Background technique [0002] The volumetric rotation device obtains a certain volume through the rotation of the motor. The size of the rotation of the motor determines the size of the volume. Every time the motor starts from the zero position, it rotates counterclockwise or clockwise at a certain angle. The characteristic is that it can only do reciprocating movement in a specific area, and cannot rotate continuously. If the direction of returning to zero cannot be accurately judged, it will cause equipment failure or even damage. [0003] In view of the above problems, in practical applications, the motor needs to be able to change the zero point position, and after the motor is restarted, it can restore the absolute position relative to the zero point and move back and forth. The prio...

AI Technical Summary

Problems solved by technology

[0004] The first technical solution is to use an absolute encoder. The advantage is that the absolute encoder can record the actual position of the motor regardless of whether the motor is powered on or off. The disadvantage is that the absolute encoder has a complex structure, a large volume, and takes up The equipment structure space is large, the price is expensive, and it cannot be universally applied

[0005] The second technical solution is to use a low-cost incremental encoder. The defect is that after the motor starts, the actual position cannot be recovered independently. Usually, peripheral origin switches, limit switches and other structures are required. After each start of the system, the motor The zero point position must be carried out first to ensure that the initial starting point position is consistent each time

The control method of this method is complicated, and many components need to be installed. If the installation is wrong or the switch fails, it is easy to cause the failure of returning to zero, resulting in the initial position of the motor after each startup.

In addition, an external battery can be connected to realize the continuous accumulation of the incremental encoder to realize the real-time recording of the motor position, but if it is repaired or disassembled or the battery power is low, the recorded position is likely to be lost, and the motor cannot be fully recorded. the absolute position of

Images