Relationship between "current" and "speed" of motor and "current loop" and "speed loop" of speed control circuit-Solution-华强电子

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

SMD aluminum electrolytic capacitor

Single chip microcomputer STM32L151CCU6

GW MB10F 0.8A 1000V rectifier bridge

The current is the inner loop, the speed is the outer loop, the outer loop drives the inner loop, and the inner loop controls the trigger circuit.
1. In the motor speed control circuit, the motor needs to run at a constant speed at a given speed, which is a speed closed loop control mode;
2. In the speed closed loop mode, the speed of the motor runs strictly at a given speed. What is the role of the “current loop”?
3. In the speed closed loop mode, the speed of the motor runs strictly according to the given speed. When the load size changes, the speed does not change, the motor current follows the normal change of the load, and the control of the current loop by the “current loop” is not available;
4. In the speed closed loop mode, the speed of the motor runs strictly according to the given speed. When the load changes, the speed does not change. The motor current follows the load abnormally. For example, when the current is heavily overloaded, the stall protection is required. This task is “current”. "Circle", then the "current loop" will control the trigger according to the set current limit, the motor speed will be quickly lowered, the current will drop, and during the stall protection, the "speed loop" will lose control of the trigger;
5, here must be clear, during the normal operation of the speed closed loop, the "current loop" does not control the normal motor current;
6, many people take it for granted, "current loop" does not work, where does the motor "current" come from? It is assumed that the motor current is provided by the "current loop". In fact, the "current loop" is only set according to the preset "control current magnitude". It either controls the current or does not control the current!
1. In the motor speed control circuit, the motor must be operated with constant current (constant torque) at a given current, which is a current closed-loop control mode;
2. In the current closed-loop mode, the current of the motor runs strictly according to the given current. What is the role of the “speed loop”?
3. In the current closed-loop mode, the current of the motor runs strictly according to the given speed. When the load changes, the current does not change, the motor speed follows the normal change of the load, and the control effect of the “speed loop” on the speed is not available;
4. In the current closed-loop mode, the current of the motor runs strictly according to the given current. When the load changes, the current does not change, and the motor speed follows the load abnormally. For example, when the speed is severely “overspeed”, “speed limit” protection is required. This task is the "speed loop". At this time, the "speed loop" will control the trigger according to the set speed limit, and the motor speed will be quickly lowered, and the current will drop. During the "speed limit" protection, the "current loop" Loss of control over the trigger;
5, here must be clear, during the normal operation of the current loop, the "speed loop" does not control the normal motor speed;
6, many people take it for granted, "speed loop" does not work, where does the motor "speed" come from? It is assumed that the motor speed is provided by the "speed loop". In fact, the "speed loop" only "limits the speed of the motor" according to the preset setting. It either controls the speed or does not control the speed!
7, many people think this way, as long as the motor runs, there is speed, there is current, speed loop, current loop of course work at the same time;
8. At this time, everyone's role in the speed loop and current loop is indifferent to the main bone of the mind;
9, the speed loop is to control the speed of the motor, the speed loop works, the speed is controlled, the speed loop does not work, that is, the speed is not controlled;
10. The current loop controls the magnitude of the motor current. The current loop acts, the current magnitude is controlled, the current loop does not work, and the current magnitude is not controlled.