Electric machinery, commonly known as "motor", refers to an electromagnetic device that converts or transmits electrical energy based on the law of electromagnetic induction.

The motor is represented by the letter M in the circuit (formerly D in the old standard), and its main function is to generate driving torque as a power source for electrical appliances or various machinery. The generator is represented by the letter G in the circuit, and its main function is to convert mechanical energy into electrical energy.

Electric motors play a crucial role in many motion control functions across various industries such as packaging, food and beverage, manufacturing, and robotics.