Brush Classification and Working Principle of Yuchai Diesel Generator Sets

Generators are widely used in daily life, but many people may not be familiar with their components. Below, Dingbo Power Generator Set Manufacturer briefly explains the classification and working principle of brushes in Yuchai diesel generator sets.

Generator set brushes are divided into two main categories: natural graphite brushes and electrographite brushes.

Natural graphite brushes are made from natural graphite powder as the base material, supplemented by resin and coal tar, through processes of mixing, pressing, curing, and machining.

Electrographite brushes are further divided into ordinary electrographite brushes and metal graphite brushes:

Common ordinary electrographite brushes are mainly formed by mixing coke, charcoal, graphite powder, and coal tar into blanks, followed by electrochemical shaping.

Metal graphite brushes are produced by grinding, mixing, pressing, curing, and machining metal powders (such as copper, silver, tin, lead) with graphite powder.

Brushes in diesel generator sets are currently widely used in generators and motors, working together with commutators. Brushes are paired with brush holders, which fix their positions. Installed in two brush holders, brushes maintain good contact with slip rings through the elastic force of springs. The leads of the two brushes are connected to the magnetic field terminal and the grounding terminal, respectively, to excite the rotor magnetic field and efficiently transmit external power to the rotor windings via slip rings.

In addition to this primary role, brushes also perform three key functions:

1.Input current: External current (excitation current) is applied to the rotating rotor through brushes.

2.Output current: Static charges on the main shaft are conducted to the ground via brushes.

3.Rectification: In commutator motors, brushes help change the current direction through rectification.

Generator set brushes come in various shapes, with rectangular ones being most common in motors, mounted on brush holders. A specific pressure is maintained between brushes and commutators or slip rings. Large brushes have complex structures, while small ones are relatively simple.

The current leads of brushes also vary: large brushes are equipped with wires, while small ones often use elastic conductive sheets. Collecting shoes used in cranes, subways, and urban rail transit can also be classified as brushes, though their materials and structures differ significantly from graphite brushes.

Founded in 1974, Dingbo Power Generation Equipment Co., Ltd. is a professional manufacturer of diesel engines, generators and generator sets, and one of the earliest manufacturers of diesel engines, generators and generator sets in China. Since 1992, the company has been a qualified generator set manufacturer inspected by the National Internal Combustion Engine Generator Set Quality Supervision and Inspection Center. Over the years, the company has carried out extensive cooperation with Shanghai Diesel, Weichai, Sweden Volvo, Sino US joint venture Chongqing Cummins, American Qianglu and other companies, and has become a (OEM) supporting factory and technical center. It has 64 sales service departments nationwide, providing users with design, supply, commissioning and maintenance services at any time. Dingbo quality is worth depending on. If you want get more information, please feel free to send email to [email protected] we will pay highly attention on your question.