Insulating materials are non-conductive materials under allowable voltage, but not absolutely non-conductive materials. Under a certain external electric field strength, they can also undergo processes such as conductivity, polarization, loss, breakdown, and aging after long-term use. Its resistivity is very high, usually in the range of 1010 to 1022 Ω· m. In a motor, the insulation material around the conductor separates the turns and the grounded stator core to ensure the safe operation of the motor
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