10 knowledge points in the insulation of hydraulic pump special motor, you do not necessarily know!

With regard to the problem of the insulation of the hydraulic oil pump's special motor, Dalan Motor Xiaobian said again, it is obvious that it is important. Today, Xiao Bian takes everyone to learn more about the related knowledge of motor insulation and learn together.

First, the current in the insulation consists of three parts:

Instantaneous charging current: It is generated by the displacement polarization of the geometrical capacitance of the medium and gradually decays with time, expressed by ic.

Absorption current: It is generated by slow polarization, volumetric charge generated by conductive ions, etc. It is also gradually attenuated with the increase of time, expressed as ia.

Leakage current: The size of the leakage current is closely related to the amount of ion contained in the insulation material. It is represented by ib.

Second, insulation resistance

The quotient obtained by dividing the dc voltage between the two electrodes in contact with the insulator or the sample by the total current through both electrodes.

Third, volume resistance

The quotient obtained by dividing the dc voltage applied between the two electrodes placed on the opposite surfaces of the specimen by the steady-state current formed between the two electrodes; that is, the resistance between the two surfaces of the insulating material.

Fourth, volume resistivity

The quotient obtained by dividing the DC electric field strength in the sample by the steady-state current density can be considered as the volume resistance in a unit cubic volume. The volume resistivity of the insulating material is usually 109 to 1021 WNaN

Fifth, the surface resistance

The quotient of the DC voltage applied between two electrodes on the same surface of the insulator or sample divided by the current between the two electrodes after a certain electrochemical time.

Six, surface resistivity

The quotient of the DC field strength at the surface of the insulating material divided by the current line density.

Seven factors that affect the resistivity: temperature, humidity, impurities, electric field strength.

Eight, dielectric

Under the action of an electric field, everything polarized can be established. Insulation is one of the dielectrics.

Nine, dielectric polarization

Under an external electric field, the surface of the dielectric generates an induced charge (bound charge) called polarization of the dielectric.

X. Basic forms of dielectric polarization

Displacement polarization, relaxation polarization, steering polarization, space charge polarization, spontaneous polarization.

----- Editor: Dalan Oil Pump Motor 02 - Procurement Consultant

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