Dual-redundancy permanent magnet synchronous motor temperature rise calculation method based on equivalent thermal network model

Abstract

The invention discloses a dual-redundancy permanent magnet synchronous motor temperature rise calculation method based on an equivalent thermal network model. The method includes: building the three-dimensional equivalent thermal network model, solving heat resistance and heat sources, building a thermal balance equation, and solving to obtain the temperature rise of each temperature rise node of a motor. The method has the advantages that the special small-tooth structure of a dual-redundancy permanent magnet synchronous motor with low-heat coupling and without electromagnetic coupling among various phases of windings is considered in modeling, the windings in grooves adopt a double-layer equivalent model with two layers of conductors and two layers of insulators being arranged in a contacted and spaced manner, the temperature rise nodes are built at other solid part nodes and fluid area nodes, contacted different nodes are connected through equivalent resistors, parts contacting with external environment nodes are connected with the external environment nodes through convection radiating resistors, and the heat sources are distributed at active nodes; when the method is used for calculating the temperature rise, calculation quantity is moderate, time consumption is low, accuracy is high. And the obtained temperature rise result can be used for guiding the determination of the motor insulating level and the configuration of a cooling manner.

Description

technical field [0001] The invention relates to the field of motor temperature field calculation, in particular to a method for calculating the temperature rise of a double-redundancy permanent magnet synchronous motor based on an equivalent thermal network model. Background technique [0002] Double redundancy permanent magnet synchronous motor is the core equipment of the drive system in the field of high safety and high reliability engineering. The double-redundancy permanent magnet synchronous motor with low thermal coupling and no electromagnetic coupling between the windings of each phase is based on the traditional fractional slot concentrated winding permanent magnet synchronous motor with even numbers of coils in the same phase. A small tooth is added at the center line of the slot on the coil side of the two-phase winding, thereby eliminating various electromagnetic couplings existing between the windings of each phase, and heat shields are placed on both sides of ...

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Problems solved by technology

[0003] The technical problem to be solved by the present invention is to overcome the fact that the calculation of the real winding model is too complicated in the temperature field analysis, and the use of a single-layer equivalent model cannot reflect the different heat dissipation conditions of the windings at the center of the slot and near the slot

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