What are the main indicators that typically affect the performance of motor insulation materials? Based on years of experience in motor manufacturing and repair, Shaanxi Asynchronous SIMO Motor holds that the primary indicators affecting insulation material performance are as follows:

　　1. Insulation Resistance and Resistivity

Resistance is the reciprocal of conductivity; resistivity is the resistance per unit volume. The smaller a material’s conductivity, the greater its resistance—and the stronger the inverse relationship between them. For insulation materials, a higher resistivity is always preferred.

The figure above showsSIMO Motor’s YE3 series ultra-high-efficiency energy-saving motors. Standard insulation class is F; H-class insulation is available upon request.

　　2. Relative Dielectric Constant and Dielectric Loss Tangent

Insulation materials serve two purposes: electrical isolation among power grid components and use as dielectrics (for energy storage) in capacitors. The former requires a low relative dielectric constant, whereas the latter requires a high one; both applications demand a low dielectric loss tangent—especially for insulation materials used under high-frequency and high-voltage conditions. To minimize dielectric loss, insulation materials with a low dielectric loss tangent are required.

　3. Breakdown Voltage and Dielectric Strength

Under a sufficiently strong electric field, insulation materials fail structurally and lose their insulating properties, becoming conductive—this phenomenon is known as electrical breakdown. The voltage at which breakdown occurs is termed the breakdown voltage (or dielectric strength). Dielectric strength is defined as the quotient of the breakdown voltage and the distance between the two electrodes across which the voltage is applied—i.e., the breakdown voltage per unit thickness. For insulation materials, higher breakdown voltage and dielectric strength are always preferable.

　　4. Tensile Strength

This is the maximum tensile stress a specimen withstands during a tensile test. It is the most widely applied and representative test of mechanical performance for insulation materials.

　　5. Flame Resistance

This refers to an insulation material’s ability to resist ignition when exposed to flame, or to prevent sustained combustion after removal from the flame source. As applications of insulation materials continue to expand, flame resistance has become increasingly critical. Various methods are employed to enhance and improve this property. Higher flame resistance translates directly to improved safety.

　　6. Arc Resistance

This denotes an insulation material’s ability to withstand surface arcing under specified test conditions. During testing, AC high voltage and low current are applied; an arc generated between two electrodes subjects the insulation material’s surface to arcing until a conductive layer forms. The time required for this formation determines the material’s arc resistance—the longer the time, the better the arc resistance.

　　7. Sealing Performance

Optimal sealing and isolation against oil and water ingress.

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