The magnetism of the aluminum nickel cobalt magnet is related to temperature, but as the temperature further increases resulting in a change in the direction of easy magnetization or a sharp decline in the magnetic properties close to the Curie temperature, the microstructure may change and may not be fully restored.

At the initial stage, the magnetic properties of the material gradually decrease due to the remanent temperature coefficient. Such as NdFeb decay 0.13% per degree Celsius, ferrite decay 0.19%, these degrees of decay in this range is basically reversible, but the higher the temperature of the decay speed may become faster. The highest operating temperature of aluminum nickel cobalt is 550 ° C, so generally speaking, the operating temperature of aluminum nickel cobalt magnetic steel is less than or equal to 550 ° C. ​

Aluminum nickel-cobalt magnets are alloys of aluminum (Al), nickel (Ni) and cobalt (Co), and are permanent magnets that do not contain rare metals. Although its magnetic field is similar to that of neodymium magnets, it has the property of losing its magnetic force under smaller external magnetic fields, so it is hardly used in conventional motors. This time, the stator is set in a place where there is no magnetic field generated by the electromagnet, and the aluminum-nickel-cobalt magnet is placed here. Thus, as with PM motors, output and efficiency are improved, especially at low speeds.

In addition, the demagnetization and magnetization of the Al-Ni-Co magnet are dynamically controlled according to the rotation speed and torque to generate the optimal magnetic field. Variable magnetic flux control corresponding to PM motors. The larger back electromotive force that becomes a problem during high-speed rotation can be suppressed.

Aluminum-nickel-cobalt magnets can be used at high temperatures in excess of 800°C, and can also be used at 300°C by using SiC (silicon carbide) power semiconductors that are also heat-resistant. Thus, the cooling mechanism can be simplified.