Rotor Installation Procedure of Mercedes Benz Generator Set

According to the specific conditions of the generator's electromechanical equipment and the construction conditions, different methods can be used to install the generator rotor. For most medium - and small - sized generators, the shaft - connecting method is used to install the rotor. As a special tool, the extension (short) shaft for rotor installation is generally supplied by the manufacturer along with the generator.

The normal procedure for installing the rotor of a Mercedes - Benz generator set is as follows:

1.Place a 0.8 - 1.0 mm thick cardboard along the entire length of the lower half - arc inside the stator. Move it back and forth at any time during the entire process of rotor installation to check if the rotor collides with the stator.

2.Position 1: The rotor is equipped with a short shaft and a rear bearing seat. The wire rope is hung on the part of the rotor cylinder close to the center for balance, keeping the rotor horizontal. Align it with the center of the stator and insert it into the stator hole until the short shaft protrudes from the front end of the stator. Then, support it with a steel beam and lower the rotor.

3.Position 2: The wire rope is hung on the short shaft of the rotor. With the help of the overhead crane and the chain hoists on both sides of the stator, apply force towards the turbine side to continue inserting the rotor into the stator.

4.Position 3: After the coupling protrudes from the stator, support the rotor, remove the short shaft, and then move the wire rope to the coupling or the main shaft to further insert the rotor into the stator. When the journal reaches the corresponding position in the bearing recess, the bearing bush can be placed in. Subsequently, remove all the lifting tools. Clean the inside of the rear bearing and the gaskets and steel plates under the seat, and then place adjustment gaskets and insulating gaskets after cleaning.

In this method, the rear bearing seat of the generator is first assembled with the rotor. That is, a rubber gasket or cardboard gasket with a thickness of more than 0.5 mm is placed between the bearing alloy in the bearing bush and the journal to connect the rear bearing with the rotor journal as a whole, thus shifting the center of gravity of the entire rotor to the side of the rear bearing seat. Then, a short shaft is installed on the other end (coupling) of the rotor, and sleepers are placed on the foundation floor at the exciter end, covered with a steel plate about 10 mm thick. The steel plate is coated with butter for lubrication during dragging. The elevation of the steel plate should be equal to the designed elevation of the rear bearing base.

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