A transient temperature prediction method for permanent magnet synchronous motors used in aviation

Abstract

The present invention proposes a method for predicting the transient temperature of permanent magnet synchronous motors used in aviation. The method performs two-dimensional electromagnetic field design on the motor and obtains corresponding electromagnetic parameters according to the geometric dimensions, material parameters, working system and load characteristics of the motor, and passes Matlab / Simulink electric drive system simulation analysis and acquisition of motor three-phase current and motor speed curves, loss calculation based on curve fitting and current source method / voltage source method, motor three-dimensional model design and finite element model grid division, cooling and heat dissipation conditions and Fluid-solid coupling analysis, temperature distribution of various parts of the motor for transient temperature prediction, high-precision temperature distribution, and maximum assistance for the optimal design of the motor.

Description

technical field [0001] The invention relates to the technical field of permanent magnet synchronous motor simulation, in particular to a method for predicting the transient temperature of an aviation permanent magnet synchronous motor. Background technique [0002] High power density has become an important index to measure the design of the motor. Due to the high power density of the motor, when the motor is in the starting, braking or special working conditions, it may bear twice or even three times the overload. Even if the working time is short under working conditions, the large current inside the stator winding will cause the temperature of the stator winding to rise sharply, which may cause insulation damage and motor burnout. Moreover, the high power density permanent magnet synchronous motor has the characteristics of high speed and high frequency. High speed and high frequency will cause the hysteresis loss, eddy current loss of the stator core and the eddy current...

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Problems solved by technology

[0006] However, in the permanent magnet synchronous motors used in aviation, there are also short-time duty motors, such as engine electric reverse thrust motors, starter motors, EHA actuator motors, and even transient duty motors. For such motors, previous studies generally believe that due to Its working time is short and heat is less, so it is not necessary to analyze the temperature field of this type of motor; however, as high power density has become an important indicator of motor design, we have found that even short-time work, or even Due to the characteristics of high power density and high torque density, the transient duty motor will also produce a large temperature rise in a short time. The motor temperature field analysis

[0007] However, for motors with short-time work system or even transient work system, the motor is prone to start, brake or large overload. Our analysis found that the copper loss of the stator winding of the motor at this time changes with the change of the stator phase current. The stator core loss, permanent magnet eddy current loss, wind friction loss of the rotor assembly and friction loss at the bearing change with the speed of the motor, that is, the loss in the motor changes with the working time of the motor, and the different losses The proportions are also different, and it is impossible to accurately reflect the temperature distribution of this type of motor after the end of the transient duty by using the above-mentioned method for the simulation analysis of the long-time duty motor. A new simulation analysis method is proposed for the working system motor. With the help of other simulation analysis software, the dynamic parameters of the motor working in a short time are obtained, and then the loss curve with time is obtained.

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