Servo motor speed given problem - Database & Sql Blog Articles

Single chip microcomputer STM32L151CCU6

Probe current voltage pin 420*4450 head diameter 5.0 over current current and voltage pin

Mobile phone crystal 3.2*2.5mm 3225 26M (26.000MHZ) 7.5PF 10PPM 20PPM 30PPM

SMD aluminum electrolytic capacitor

1. The servo system controls the speed of the motor by the speed loop;

2. The speed of the motor, the DC motor determines the level of the voltage, and the AC motor determines the frequency;

3. Therefore, the output of the regulator of the speed loop controls the frequency of the AC motor or the voltage of the DC motor;

4. How does the speed loop detect the speed of the motor? It should be said that the detection of speed depends on the encoder;

5, because the encoder's feedback pulse frequency = encoder resolution × motor speed

Therefore, the speed of the motor is proportional to the encoder feedback pulse frequency!

6. That is to say, the speed loop detection feedback is the frequency of the encoder pulse;

7, then to give the motor speed, the frequency of the encoder pulse must be given;

8. As long as the frequency of the encoder pulse is given, the speed of the motor is given;

9, there is no encoder feedback pulse frequency setting on the operation panel, only the setting of the command pulse frequency is the S1 that the landlord said;

10, because the electronic gear ratio = encoder resolution / week command pulse number,

So the number of weekly command pulses = encoder resolution / electronic gear ratio

So the number of weekly command pulses × motor speed = encoder resolution × motor speed / electronic gear ratio

And because the number of weekly command pulses × motor speed = command pulse frequency, encoder resolution × motor speed = encoder pulse frequency

Therefore, the command pulse frequency = encoder pulse frequency / electronic gear ratio

So set the command pulse frequency, that is, set the encoder pulse frequency, that is, set the motor speed in the speed loop.

11. In this way, our conclusion is that the user only needs to set the command pulse frequency S1 on the operation panel, that is, set the motor speed on the speed loop!

12. The user only needs to set the command pulse frequency S1 on the operation panel, which is to set the motor speed on the speed loop! Does not change the pulse equivalent, electronic gear ratio, and number of weekly command pulses that have been set;

13, then the upper limit of the command pulse frequency is the rated technical frequency of the position loop counter (or the nominal frequency of the plc pulse that everyone says);

14, then the upper limit of the command pulse frequency, the corresponding is the upper limit of the motor speed!

15. How to determine the frequency of the command pulse?

1) Command pulse frequency = number of weekly command pulses × motor speed;

2) With the motor speed (r/s), the command pulse frequency can be calculated.