How to determine the origin of the servo motor2021

Normally there are two types of encoders for servo motors: absolute encoders and relative encoders. The absolute encoders can be maintained when power is off. As long as the battery is still powered, there is no need to find the origin; while the relative encoders are disconnected due to power failure. The multi-turn value of the motor will be lost after power-on, so the home search operation is required. The servo motor relative to the encoder needs an external sensor to cooperate in the process of homing. When the external sensor detects the homing position block, the servo motor switches from homing high speed to homing low speed, when the motor continues to run to the outside After the sensor detects the falling edge, the servo motor can rotate to the encoder Z-phase output point, but there are several points that need to be paid attention to:

Encoder|Transmitter|Soft starter|Power supply|VFD|Light curtain|Servo products|Human-machine interface|Solenoid valve|Cylinder|Actuator|Flow meter|Transformer|Thyristor|Sensor|Deceleration drive gearbox reducer|Linear guide|Circuit breaker|Refrigeration compressorAll industrial products of okplazas are purchased from the original factory or formal channels of agents to ensure the original authenticity, which perfectly solves the problem of industrial product sample procurement and small-batch procurement for the majority of engineers and purchasing personnel.

1. If the encoder behind the servo motor is fixed firmly, the Z-phase pulse point is fixed, and the servo origin search is very accurate;

2. There are many ways to find the origin of the servo motor, and it is necessary to determine the running direction of the motor in each process according to the field equipment;

3. The accuracy of the origin does not depend on the accuracy of the external sensor. As long as the external sensor is not loosened, the servo motor should find the origin very accurately;

4. Generally speaking, the purpose of servo motor homing is to match the current actual position of the motor with the position in the controller. Therefore, the last stop position of many servo motors when homing is not at the position of 0.0, there will be a little deviation. This deviation does not mean searching. There is an error in the origin position, but because the actual position of the motor has been matched with the internal position of the controller, it is not necessary to go to the origin accurately.

How does the servo motor return to its origin?

1. Determine a direction to move to find the origin (this is suitable for turntables)

2. Determine a direction and find the limit position at one of the two ends as the origin. (In the PLC, you can write this kind of program yourself, and some motion control cards have this kind of zero return method option)

3. Determine a direction, first find the limit at one end, and then reverse to find the origin. (Most of your exercises use this way of returning to zero.)