The creep phenomenon of electric excavator without excitation

The generator is dragged by the diesel engine to the DC motor, the power supply, the composition, the unit, and the motor dragging the excavated bucket. The excitation of the generator and the motor is respectively powered by a separate DC power supply, which is connected to the other side to stop working.

After a period of maintenance operations, the excavator will not work. Disconnected, the excavator bucket produces a lot of creep. When the excavator is working, there is a strong spark generated by the generator brush, causing the maintenance personnel to pay attention. After inspection, it was found that since the excavator is often subjected to strong vibrations, the screw fastening the brush holder is not tightened during inspection, so that the brush originally located at the neutral position of the child is shaken by the brush holder and deviated from the original position. The generator armature rotates in the direction of rotation by two angles. Although the generator excitation switch is off, residual magnetic flux still exists in the remanent magnetic pole 0,1, and the prime mover drags the generator armature to rotate and cut the residual magnetic flux hole to generate a residual potential. 0 The system armature is closed and generates an armature current under the action of the residual magnetic potential to establish the armature magnetic potential of the generator. This magnetic potential is decomposed into the transaction axis and the direct axis magnetic potential. The direct axis magnetic potential; The generated magnetic flux is exactly in the same direction as the residual flux, making the magnetic flux in the air gap stronger. When the main circuit switch of the system is disconnected, since the armature current is zero and the direct axis armature magnetic potential 弋7 is zero, only the residual magnetic flux establishes the potential, and the voltage across the generator armature is extremely small, which is only the residual magnetic voltage. When the main and path switches are closed, the 4-axis flux created under the effect of the residual magnetic potential enhances the magnetic flux in the air gap of the generator, so that the generator potential is enhanced, and the voltage of the generator reaches 2%. Because the excavator's motor is still blocked, 3 counter-electromotive force is zero, and the stalled current reaches 2 so that the electromagnetic torque is generated in the motor, so that the excavator generates creeping force when the generator is not excited.

In response to this phenomenon, we newly adjusted the brush position so that it was fixed at the geometric neutral position and tightened the brush holder screw. Since then, there was no creeping phenomenon in the excavator bucket when there was no excitation, and there was no strong spark under the generator brush when the excavator was running.

The whole plant has special features, and it deals with the power plant of Zhuzhou Smelter. He Yanjun I plant has a rectifier unit for electrolysis, model number is 5,0800. The connection form is double reversal star type with balanced reactor, and the main circuit uses two strings and The structural rectifier component is selected as 26,0,500, and it is cooled by deionized water. The device is put into operation for more than 5 years. The operation is straight and normal. It seems that the 1 branch flash fuse is frequently blown. For this purpose, the 1600 was replaced by fast-melting, but the fast-melting was still blown twice and the branch element was broken twice.

To verify the correctness of the analysis, we replaced the 831 branch fast-melt history with 8, 600. As a result, the flash only runs large and breaks, checking that the components are intact.

How can we mention the average flow of the phase, in the general case, the following methods in series equilibrium reactor. This method is used when the component selection is difficult. Reactors have large volume and weight, and the device structure is complicated.

Optional components. This method is applicable to the case where the number of parallel connections is small, and it is inconvenient to replace the components when identifying and matching consumption.

The current is high on the branch silicon steel ring. This method is inexpensive and convenient, but it has the same effect.

Use current transformers. This method is suitable for devices with less branch per arm and smaller volume than balanced reactors.

We use methods to install equalizing reactors on the bench. We have been operating for many years and have been operating normally.

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