The motor has several structures.

Flat belt, triangle belt, round belt, toothed belt.

Motor (commonly known as "motor") refers to an electromagnetic device that realizes electric energy conversion or transmission according to the law of electromagnetic induction. In the circuit, it is represented by the letter m (the old standard is d). Its main function is to generate driving torque as the power source of electrical appliances or various machinery. The generator is represented by the letter g in the circuit. Its main function is to convert electric energy into mechanical energy.

A belt. Nowadays, environmental protection is advocated internationally, so PU belts are the most popular, and there are fewer and fewer genuine leather belts on the market. China is the largest belt exporter in the world. Belts exported to the European Union and the United States must meet strict environmental protection and non-toxic standards. Nowadays, the popular belts are gradually widened and lengthened, with one end wide and one end narrow, and the width can reach more than 12 cm. Decorated with shiny metal buttons, the colors are diversified, including red, lake blue, prestige, goose yellow, milky white and so on.