The speed feedback voltage of 590 DC speed regulation is set to a large size

If the tachometric feedback voltage setting of the 590 DC governor is greater than the feedback voltage calculated from the maximum speed of the motor, the following effects may occur:

1.Increased error: If the set speed feedback voltage exceeds the actual feedback voltage, the control system will misjudge the actual speed of the motor. This can lead to errors in the control system that cannot accurately control the speed of the motor.

2.Instability: Setting too high a tachymetric feedback voltage may cause instability in the control system. When the actual speed is close to or exceeds the set feedback voltage, the control system may oscillate or unstable behavior, resulting in unstable motor operation.

This can cause the motor to be overloaded, exceeding its rated capacity, causing motor damage or other malfunctions.

For the case you mentioned, if the maximum speed of the motor is 2000r min and the tachogenerator voltage is 110V, the calculated theoretical feedback voltage is 73V. If the set tachometric feedback voltage is set to 90V, it may cause the control system to misjudge the actual speed of the motor, which may cause the effects mentioned above, such as increased error, instability, and risk of overload.

Therefore, it is recommended that you set the speed feedback voltage correctly according to the actual performance of the motor and the manufacturer's recommendations to ensure the accuracy and stability of the control system and avoid damage to the motor.

The main consideration is why do you want to set it high? If it does not exceed the maximum speed of the motor, it basically has no effect, because the motor is still in a reasonable range, but if it is to be fully loaded, it is absolutely not possible, and it is easy to explode thyristor.

When there is no load, the motor will rotate fast and the armature voltage will be high.

To measure the armature current of the 590 DC governor through an oscilloscope, you can follow these steps:

1.First, make sure that your oscilloscope is properly connected to the circuit. Connect the ground of the oscilloscope's probe to the common point of the circuit, and then connect the oscilloscope's channel 1 probe to the armature electrical pure current measurement point.

2.Select the appropriate settings on the oscilloscope. Select the DC-coupled mode and set the oscilloscope's time reference to the appropriate range so that you can observe the current waveform. Noji.

3.Adjust the vertical and horizontal zoom of the oscilloscope so that you can clearly see the current waveform.

4.Start the 590 DC governor and run the situation you want to measure the current.

5.Observe the current waveform displayed on the oscilloscope. Depending on the oscilloscope's scale and measurement range, you can estimate the magnitude and variation of the current.

Please note that using an oscilloscope to measure current requires care and proper safety practices. Make sure that the circuit and the oscilloscope are properly connected and avoid any damage or short circuit to the circuit.

Oscilloscope current probes are expensive!