How to determine the electronic gear ratio of servo motor?

Reading guide ： So-called “ Electronic gear ” function , There are two main applications ： First, adjust the motor rotation 1 Number of command pulses required for a cycle , To ensure that the motor speed can reach the required speed .

1． Introduction to electronic gear ratio parameters

So-called “ Electronic gear ” function , There are two main applications ： First, adjust the motor rotation 1 Number of command pulses required for a cycle , To ensure that the motor speed can reach the required speed . For example, the upper computer PLC The maximum sending pulse frequency is 200KHz, If the electronic gear ratio is not modified , Then the motor rotates 1 Circle needs 10000 Pulse , Then the maximum speed of the motor is 1200rpm, If the electronic gear ratio is set to 2：1, Or set the number of pulses per revolution to 5000, Then the motor can reach 2400rpm speed .

for example ： The electronic gear ratio is set to 1： 1 Or set the number of pulses per revolution to 10000, Upper computer PLC The maximum sending pulse frequency is 200KHz.

2． Calculation of pulses per revolution and electronic gear ratio

According to the following 1～6 The order of , Calculate the number of pulses per revolution or electronic gear ratio .

Be careful ：

（1） The number of pulses per revolution and the electronic gear ratio can limit the rotation of the servo motor 1 The amount of instructions required for the loop , The two are complementary , But the priority of the number of pulses per revolution is higher than the electronic gear ratio , Only the number of pulses per revolution is set to 0 The electronic gear ratio will take effect , This is what users need to pay attention to . In special cases, if the number of pulses per revolution is a decimal, the use of electronic gear ratio should be considered .

（2）P2－02 and P2－03 When the setting range is exceeded , Please divide the numerator and denominator into integers within the settable range for setting . The fraction reduction without changing the ratio does not affect the use .

（3） Unless otherwise specified, the current motor encoder resolution is 2500P／R.

（4） The instruction unit does not represent the machining accuracy . Refine the instruction unit quantity on the basis of mechanical accuracy , It can improve the positioning accuracy of servo . For example, when applying the lead screw , The mechanical accuracy can reach 0．01mm, that 0．01mm The command unit equivalent of is 0．1mm The command unit equivalent of is more accurate .

3． Setting example of electronic gear

give an example ：

Supplementary explanation of the above example ： Number of upper computer pulses 5000, It's through , Lead screw pitch is 5mm, The pulse equivalent requirement is 0．001mm, So the number of pulses is 5／0．001＝5000. The encoder feedback pulse is 131072 A turn （ Servo motor ）, But due to the variable speed mechanism , so 3／2.