Who stole the efficiency of a special hydraulic motor pump? Dalan electrical analysis of the problem!

The hydraulic oil pump motor is directly related to the energy conservation and emission reduction policy. Many national key projects and municipal project bidding motors must meet the IE3 energy efficiency assessment requirements, but for the motor production enterprises, there are many bottleneck technologies that need to be broken, such as the determination of the loss, affect the motor The determination of key factors of efficiency, causes of loss, and quantitative analysis. The following Dalan Motor Xiao Bian begins with the causes of the increase in loss, and gives them a breakdown and an analysis.

Stator winding resistance:

(1) Large wire resistivity or small wire diameter, uneven wire diameter, or less number of windings around;

(2) Wrong wiring or poor welding;

(3) The actual number of turns is greater than the design value.

Stator current is large:

(1) Other losses are greater;

(2) Three-phase imbalance due to the asymmetry of the stator windings;

(3) The air gap of the rotor is not uniform;

(4) Since the number of turns is less than normal, the resistance will be less than normal;

(5) Winding wiring is incorrect.

Rotor winding (or guide bar) resistance:

(1) The resistivity of aluminum (copper) is large;

(2) There are gas pores or impurities in the cast aluminum rotor bar or end ring, or there are local thin strips due to casting defects;

(3) Stator slots are not neat (shown as slot sawtooth), and there are mis-sheets and anti-sheets, resulting in insufficient rotor slot effective area;

(4) Due to the improper choice of cast aluminum parameters, the microstructure of aluminum is loose, which leads directly to the increase of resistivity.

(5) The material does not meet the requirements, such as aluminum alloy used in ordinary aluminum rotor;

(6) using the wrong rotor.

Large rotor current:

(1) using the wrong rotor;

(2) Aluminium is used in cast aluminum, for example, aluminum alloy rotor uses ordinary aluminum;

(3) The lamination of the rotor core is not true, resulting in a large area of ​​aluminum in-between chips, resulting in excessive rotor lateral current.

Large stray loss:

(1) Improper selection of stator winding pattern or pitch;

(2) Improper selection of stator and rotor slots;

(3) The air gap is too small or seriously uneven;

(4) Severe short circuit between the rotor guide bar and the iron core;

(5) The stator winding ends are too long.

The number of iron cores is insufficient and the weight of iron is not enough:

(1) Insufficient chips (missing);

(2) The pressure of lamination is small and not compacted. The direct result is insufficient iron weight;

(3) The burr of the punching sheet is large, and the iron weight cannot be guaranteed when the iron length is in compliance;

(4) Too thick paint is a direct quality problem of silicon steel sheet.

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

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