3 control modes commonly used in servo motors
Servo motors are usually controlled by three circuits, which are three closed loop negative feedback PID control systems. The PID circuit is the current circuit and implemented inside the servo controller. The output current from the controller to the motor is based on checking the Hall elements, the negative feedback current is set according to the PID, and the output current is adjusted to be as close as possible to the set current. The current circuit controls the torque of the motor, so the controller has fewer operations and fewer daily dynamic responses and should be faster in torque control mode. Although there are many control modes available in servo motors, Gator Precision, one of the top 10 satisfactory rotor factories in China integrating mold making, silicon steel sheet stamping, assembly of motors, production and sales, will discuss here the three most common control modes used in a servo motor.
The main control modes of the servo motor include torque control mode, position control mode, and velocity mode.
1. Torque control mode. In this mode, the motor shaft output torque is set via an external analog input or direct address assignment. For example, the output torque of the motor shaft is 2.5 Nm when the external analog is set to 5 V. When the motor rotates with a load on the shaft less than 2.5 Nm and the load external is 2.5 nm (greater than 2.5 nm), the motor is hard to turn. When the servo motor reverses (usually under the load of force), the analog quantity setting can be changed in real time by changing the torque setting or changing the relative address value according to the communication.
2. Position control mode. The position control mode usually specifies the speed ratio by the pulse frequency of the external input and the perspective by the number of pulses. The speed and offset of some servo drivers can be assigned directly via communication. In this mode, the speed and position can be strictly controlled, so the position control mode is generally used for positioning CNC lathes and printing equipment.
3. Speed mode. Speed can be controlled based on analog input or single pulse frequency. When the control device outer ring PID control can be used, the speed mode can also be positioned, but be sure to supply the motor position data signal or direct the load to the upper level for operation. Servo motor rotor main companies find that the position mode is also applicable to the outer side of the direct load to check the position data signal, where only the motor speed is checked on the shaft side of the servo motor, and the position data signal is provided by the load-side direct control device. By doing so, the deviation of the intermediate drive will be reduced and the positioning accuracy of the whole system will be improved.
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