The slip ring (also known as the slip ring) is a cage type asynchronous brake deceleration motor without such a component in the rotor, and its function is to connect the three-phase lead of the winding to the external circuit through the brush. Common defects include worn work surfaces, damaged insulation, loose fits, and high temperatures.

The reasons are as follows:

1. The working temperature of the slip ring is too high.

The reasons are: the slip ring and the brush are in good contact, the contact area is too small (less than 70%), the current density is too high, the brush pressure is too small or too large, the slip ring and the brush are in poor contact, and the operating temperature of the slip ring is too high.

2. Defects such as spots, brush marks, unevenness, corrosion, burns, cracks, ellipses, metal peeling, etc. appear on the working surface of the collector ring after wear.

The reason is that the brush contains hard particles, the abrasive is stuck between the brush and the working surface of the carbon brush slip ring, or the slip ring is of poor manufacturing quality.

3. The slip ring and the plastic are loose.

For example, a plastic slip ring is made of phenolic compression-molded plastic and three copper rings pressed into a whole. After the slip ring is used, the slip ring will loosen due to plastic shrinkage deformation, cracking and other reasons.

4. The collector ring insulation is damaged.

There are two common types of small and medium wound rotor asynchronous brake motors: assembled slip rings and conductive slip rings. During use, the aging of the insulating sleeve, the looseness of the collector ring, the poor contact of the lead welding part, the local overheating, the damage to the wire insulation cylinder, the displacement of the brush box, etc. may cause mechanical and thermal damage. There are also plastic slip rings, but with plastic slip rings Weak, cracks appear, carbon powder and brush oil enter the cracks, or carbon powder accumulates between the slip rings, causing damage to the slip rings and shafts. Fiber Slip Rings.