What Is the Lesser Trochanter?

Rotor refers to a rotating body supported by a bearing. Objects such as optical discs, which do not have a rotating axis, can be regarded as a rotor when it uses a rigid connection or an additional axis.

According to ISO standards, a rotating body supported by a bearing is called a rotor. The rotor is mostly the main rotation in power machinery and work machinery

For example, in an induction motor, a rotor composed of a rotating shaft iron core and a closed conductor embedded in the iron core generates high-speed rotary motion under the driving of a rotating magnetic field generated by a stator winding. Rotor ends

Typical rotors are

Rotors are difficult to commutate, rotate at high speeds, and various faults occur frequently. Common faults include commutator damage, bearing damage, wind blade damage, brush wear, and rotor winding burnout.

Broken rotor commutator

Common faults of commutator are burnt holes on the surface, flying out of the commutator, short circuit between commutator and commutator, out-of-round commutator, excessive wear on commutator, protruding mica sheet, and Coil leads are imaginary.

Burner holes on the surface of the commutator, flying out of the commutator, short circuit between the commutator and commutator, and excessive wear of the commutator. The commutator must be replaced, and the rotor winding also needs to be replaced.

For the fault of commutator out-of-roundness, it can still be used after processing with horizontal lathe.

If the commutation piece and the coil cause a virtual connection, the fault point of the virtual connection can be washed and riveted or welded according to the situation. If the failure point cannot be found, the commutator can only be replaced, and the rotor winding also needs to be replaced.

If the mica sheet of the commutator is convex, the side of the toothed side of the hacksaw blade can be thinned, and then the mica sheet can be lowered, and beveled and ground.

Damaged rotor bearing

The bearing types commonly used in power tools are 608, 629, 101, 102, 200, 201 and so on.

Common failures of bearings are too large clearances, broken bearings, running jackets, running inner sleeves, etc.

For faults such as excessive bearing clearance, bearing chipping, and lockup, new bearings need to be replaced. For some running jackets and excessive clearance, you can pad a thin iron sheet (such as some iron beverage bottles) or replace the case. And for some gaps are not particularly large, you can apply AB universal glue to solve. For some running sets, you can use the method of punching points on the shaft to solve it.

Damaged rotor blades

Wind blades are often broken, deformed, and loose when they are faulty. You can remove the old ones or replace them with new ones. Deformed iron blades can also be corrected with needle-nose pliers. For the loose between the wind blade and the shaft, you can also apply AB universal glue to stick firmly.

Rotor brush wear

Generally, when the length of the brush wears down to 1/3 of the original length, it should be replaced. The brush is too short, it is easy to burn the commutator and cause the rotor to be scrapped. The size of the brush is generally expressed by length × width × height. In addition to the same size required for replacement, it must be replaced with the same brand. Generally, the two brushes should be replaced at the same time.