DC motors are widely used in various portable electronic devices or appliances, such as tape recorders, VCD players, record players, electric massagers, and various toys. They are also widely used in industries such as automobiles, motorcycles, electric bicycles, battery cars, ships, aviation, machinery, and other industries. They are also widely used in a number of high-precision and cutting-edge products, such as video recorders, copiers, cameras, mobile phones, precision machine tools, bank counting machines, and cash bundling machines. In terms of stage lighting, the usage of DC motors, especially small permanent magnet DC gear motors, is extremely high. In the computer industry, printers, scanners, hard drives, optical disc drives, recorders, cooling fans, etc. all require a large number of DC motors.