Which type of motors are permanent magnets used in the construction of?

Permanent magnets are primarily used in the construction of DC motors. This is because DC motors, especially brushless and permanent magnet DC (PMDC) motors, rely on the interaction between permanent magnets and the windings to create rotational motion. The magnetic field generated by the permanent magnets interacts with the magnetic field produced by the current flowing in the motor’s windings, allowing for an efficient conversion of electrical energy into mechanical energy.

In contrast, while AC motors can sometimes incorporate permanent magnets (such as in permanent magnet synchronous motors), the question specifically points towards the traditional application of permanent magnets, which is more common in DC motor designs. Therefore, the correct choice highlights the specific association of permanent magnets with DC motor technology.