1. The purpose of the experiment?

1. The work of thyristor DC motor speed control system under feedback control is studied. ?

2. Research on governor ASR in 2.DC speed regulation system? Work and its influence on the static characteristics of the system. ? 3. Learn the debugging technology of feedback control system.

2. preview requirements?

1. Understand the input and output characteristics of speed regulator in proportional operation and proportional integral operation. ? 2. Understand the working principle of irreversible single closed-loop DC speed regulation system. ?

Three. Experimental circuit and principle

4. Experimental equipment and instruments

1.MCL？ Main control board of series teaching experiment platform. ?

2.MCL—— 18？ Component (applicable to MCL-Ⅱ) or MCL-3 1? Component (for MCL-ⅲ).

3.MCL-33 (a) component or MCL-53? Component. ? 4.MEL- 1 1？ Hanging box?

5.MEL—03？ Three-phase adjustable resistor (or its own slide rheostat).

6. Motor guide rail and tachometer generator, DC generator M0 1 (or motor guide rail and dynamometer, Mel- 13? Component). ?

7.DC motor M03. ?

8. Double trace oscilloscope.

Verb (abbreviation of verb) notes?

1. DC excitation must be added before the DC motor works. ?

2. access ASR? When negative feedback of rotational speed is formed, in order to prevent oscillation, ASR? RP3？ Turn the potentiometer counterclockwise to the bottom to minimize the magnification of the regulator. Meanwhile, ASR? The "5" and "6" terminals of the are connected with an adjustable capacitor (preset to 7μF). ? 3. When measuring the static characteristics, it should be noted that the current in the main loop cannot exceed the rated value of the motor (1A). ? 4. Pay attention to the connection of three-phase main power supply, and don't change the wrong phase sequence.

5. When the power switch is closed, the overcurrent protection LED may light up. Just press the corresponding reset switch SB 1? Namely. Can work normally. ?

6. When the system is connected in an open loop, it is not allowed to suddenly add a given signal Ug? Start the motor.