Due to differences in structure and process, high-voltage motor coils can be divided into two types: formed coils and scattered embedded coils. Generally, smaller products will use soft windings, which are loose embedded coils, while larger products will use hard windings, which are formed coils.

For example, the armature coils of some DC motors and large-sized low-voltage and high-voltage motors are generally made of molded coils, which are usually made of insulated flat copper wire, making it easier to maintain their shape. So the formed winding is composed of the formed coil, and the coil needs to be processed before embedding the wire to obtain its shape. After embedding it into the iron core slot, it is generally not adjusted in any way. Soft windings, on the other hand, use single turn or multi turn parallel winding of source electromagnetic wires, and are often used in motors with operating voltages below 500V.