What are magnetic slot wedges made of?

In the field of motor manufacturing and maintenance, slot wedges are an important component to secure the winding coils and prevent them from displaced during operation. Depending on the characteristics of the material, slot wedges are mainly divided into two types: magnetic slot wedges and non-magnetic slot wedges. Today, let’s mainly learn about magnetic slot wedges.

Materials for making magnetic slot wedges

‌Magnetic slot wedges are mainly made of glass fiber cloth, epoxy resin and iron powder. Specifically, the magnetic slot wedge is uniformly added to the resin, and is compositely reinforced with an alkali-free glass fiber cloth, and is molded by hot pressing. This structure makes the magnetic slot wedge have good magnetic permeability and mechanical properties.

Epoxy resin: Epoxy resin is the main component of magnetic slot wedges, which provides the basic shape and stability of the slot wedge. After heating and curing, epoxy resin forms a hard solid with good mechanical properties and heat resistance. Epoxy resin not only has high strength and hardness, but also can maintain stable performance at higher temperatures, so it is very suitable for manufacturing magnetic slot wedges.

Reinforced glass fiber: Reinforced glass fiber is added to epoxy resin to improve the mechanical properties and heat resistance of the slot wedge. Glass fiber has high strength and modulus, and can withstand large stress and deformation. At the same time, glass fiber also has good heat resistance and can maintain stable performance in high temperature environments. Therefore, the addition of reinforced glass fiber makes the magnetic slot wedge have higher strength and better heat resistance.

Magnetic powder: Magnetic powder is a key component of magnetic slot wedges, which gives the slot wedges magnetic conductivity. Common magnetic powders include iron powder, nickel powder, etc. These magnetic powders can be magnetized under the action of a magnetic field, thereby guiding the distribution of magnetic field lines. By adjusting the content and type of magnetic powder, the magnetic conductivity and electromagnetic properties of the magnetic slot wedge can be controlled.

The impact of the manufacturing process of magnetic slot wedges on its performance

The manufacturing process of magnetic slot wedges has an important impact on their performance. During the manufacturing process, if the magnetic slot wedge fits too loosely with the slot, it is easy to vibrate and fall off; if it fits too tightly, it may be damaged by excessive impact during installation. Therefore, the process needs to be strictly controlled during the manufacturing process to ensure that the magnetic slot wedge fits properly with the slot to reduce the risk of falling off and damage.

Application of magnetic slot wedges in motors

Magnetic slot wedges are mainly used in motors to seal stator slots. Traditional slot wedge materials such as wood, fiber or plastic slot wedges will form air gaps after sealing, causing magnetic field lines to generate high-order harmonic magnetic fields in the air gap and increasing additional losses and heat generation of the motor. Magnetic slot wedges, due to their magnetic conductivity, can effectively guide the distribution of magnetic field lines, reduce the impact of high-order harmonic magnetic fields, and thus reduce additional losses and heat generation of the motor.

In addition, the application of magnetic slot wedges can also improve the efficiency and performance of the motor. By optimizing the magnetic conductivity and electromagnetic properties of the magnetic slot wedges, the iron loss and copper loss of the motor can be further reduced, and the efficiency and power factor of the motor can be improved. At the same time, the application of magnetic slot wedges can also improve the running stability and reliability of the motor and extend the service life of the motor.