It is said that motors are responsible for 40% of the worldʼs power consumption, and thus increasing their efficiency represents a key issue. Therefore, the existence of magnetic slot wedges that achieve high efficiency simply by mounting without changing the structure or size of the motor are drawing attention. By utilizing a new technology that bonds magnetic particles together, Proterial has developed a new type of magnetic slot wedge that does not contain any resin. This new technology has made it possible to increase the density of the magnetic particles, resulting in a high magnetic permeability that is about double the level of existing magnetic slot wedges. As a result, in a general 3.7kW four-pole motor we were able to improve efficiency by 0.5% compared with motors with existing magnetic slot wedges.