FRP Dog Bone: A High-Performance Electric Motor Winding Support

FRP Dog Bone is a type of pultruded profile made of fiber glass yarn (FRP/GRP) and resin for electromechanical applications. It is used as a dovetail spacer in coil winding assembly in dry type transformers, switchgear, on load tap changer insulation, motor slot wedges, and other electrical equipment. FRP Dog Bone has the advantages of high mechanical strength, small partial discharge, small dielectric loss, high temperature resistance, aging resistance, and easy processing. It can improve the efficiency and reliability of electric motors and reduce the maintenance cost.



Structure and Dimensions

FRP Dog Bone has a cross-sectional shape of a dog bone, with two parallel rectangular bars connected by a thinner rectangular bar. The dimensions of FRP Dog Bone vary according to the customer’s requirements and the specifications of the electric motor. The length of FRP Dog Bone can be supplied in any length or cut at different sizes as required. The standard sizes of FRP Dog Bone are shown in the table below:
 

There are also reinforced FRP Dog Bones with higher strength and stiffness, which have the following sizes:
 

Performance and Parameters

FRP Dog Bone has excellent performance and parameters for electric motor winding support. Some of the main parameters are listed below:

Tensile strength: >400 MPa
Flexural strength: >600 MPa
Compressive strength: >400 MPa
Shear strength: >50 MPa
Thermal conductivity: <0.3 W/mK
Dielectric strength: >12 kV/mm
Volume resistivity: >10^15 Ω·m
Water absorption: <0.1%
Flammability: UL94 V-0


Conclusion

FRP Dog Bone is a high-performance electric motor winding support that can enhance the efficiency and reliability of electric motors and reduce the maintenance cost. It is made of fiber glass yarn and DCPD resin in class H for electromechanical applications. It has high mechanical strength, low dielectric loss, high temperature resistance, aging resistance, and easy processing. It can be supplied in various sizes and lengths according to the customer’s requirements and the specifications of the electric motor. FRP Dog Bone is a cost-effective and durable solution for electric motor winding support.