Next-generation motors that do not use permanent magnets
These are also called switched reluctance motors or variable reluctance (VR) motors. In principle, the rotor has neither permanent magnet nor winding. The motor structure is simple and inexpensive, the motor is mechanically sturdy, and there is no problem with rotor heat generation. This type of motor has the feature that there is no problem of thermal demagnetization of the permanent magnets and it can operate at high temperatures.