What does the commutator include

Update:02 Apr 2022

1. Generator blades

The fan blades of the motor are generally located at the rear of the motor for ventilation and cooling of the motor, mainly at the tail of the AC motor, or placed in the special ventilation ducts of the DC and high-voltage motors. The fan blades of explosion-proof motors are generally made of plastic.

According to the material: plastic fan blades, cast aluminum fan blades, cast iron fan blades.

2. Commutator (collector)

The commutator (collector) is an important part of the DC motor. Its function is to convert the DC current passing through the brush to the alternating current in the winding or to convert the alternating current electromotive force in the winding to the direct current electromotive force at the brush end.

Commutators include: mechanical commutators, semi-plastic commutators, and all-plastic commutators.

The commutator used in automobile starter mainly adopts mechanical arch commutator and plastic commutator.

3. Carbon brush

Carbon brushes are also called electric brushes. As a sliding contact, it is widely used in many electrical equipment. The main materials used in carbon brushes are graphite, greased graphite and metal (copper, silver) graphite. A carbon brush is a device that transfers energy or signals between the stationary and rotating parts of a motor or generator or other rotating machinery. It is usually made of pure carbon plus a coagulant. The appearance is generally blocky, stuck on a metal bracket. A spring presses it tightly against the shaft. When the motor turns, the electrical energy is transferred to the coils through the inverter. Because its main component is carbon, it is called a carbon brush, which is easy to wear. It should be regularly maintained and replaced to clean up carbon deposits.

4. Insulation paper

It is an insulating material used in various electrical equipment such as cables and coils. In addition to having good insulation properties and mechanical strength, each has its own characteristics. Motor insulation includes inter-strand insulation, inter-turn insulation, inter-row insulation, inter-layer insulation and absolute insulation of motor coils, various supports or fixings at the ends, insulation of various insulating parts, connecting wires and lead wires.

5. Bearings

Bearings are an important part of modern machinery and equipment. Its main function is to support the mechanical rotating body, reduce the friction coefficient during its movement, and ensure its rotation accuracy.

According to the friction characteristics of moving elements, bearings can be divided into rolling bearings and sliding bearings. Among them, rolling bearings have been standardized and serialized, but compared with sliding bearings, their radial dimensions, vibration and noise are larger, and their prices are higher.

Rolling bearings are generally composed of four parts: outer ring, inner ring, rolling elements and cage. Strictly speaking, it consists of six parts: outer ring, inner ring, rolling element, cage, seal, and lubricant. It is mainly equipped with an outer ring and an inner ring, and the rolling elements can be defined as rolling bearings. According to the shape of the rolling elements, rolling bearings are divided into two categories: ball bearings and roller bearings.

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