Method for analyzing starting performance of cage type motor

A technology of starting performance and analysis method, applied in computer-aided design, design optimization/simulation, calculation, etc., can solve problems such as calculation error, no bidirectional coupling of electromagnetic and temperature, ignoring the bidirectional influence of electromagnetic loss and temperature rise, etc., to avoid The effect of poor reliability, avoiding excessive calculation, and short calculation time

Active Publication Date: 2022-06-24
DONGFANG ELECTRIC MACHINERY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Aiming at the deficiencies of the prior art, the present invention proposes a method for analyzing the starting performance of the cage motor, which solves the problem of neglecting the two-way influence of electromagnetic loss and temperature rise in the calculation of the prior art, and does not carry out two-way coupling between electromagnetic and temperature. For large-capacity For large and medium-sized motors with high moment of inertia, it will bring a large calculation error problem

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  • Method for analyzing starting performance of cage type motor
  • Method for analyzing starting performance of cage type motor
  • Method for analyzing starting performance of cage type motor

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Embodiment approach

[0058] As a preferred embodiment of the present invention, this embodiment discloses a method for analyzing the starting performance of a squirrel motor, which includes the following steps:

[0059] S1. Perform finite element modeling and coupling circuit modeling of the motor body, set boundary conditions, perform finite element solution and post-processing, and obtain a series of data required for subsequent calculations, including different stator voltages, different rotational speeds, and different rotors. The electromagnetic torque of the motor and the loss of each component under the temperature, and the obtained data is exported to the database;

[0060] S2. Start the calculation from the speed of 0 and the starting temperature of the cage bar as the input, and perform two-dimensional interpolation of the speed and the temperature of the cage bar from the database, and the output result is the electromagnetic torque and the instantaneous loss of each component;

[0061]...

Embodiment 2

[0069] As another preferred embodiment of the present invention, refer to the accompanying figure 1 , this embodiment provides a method for analyzing the starting performance of a squirrel motor, including the following steps:

[0070] S1. Carry out the finite element modeling and coupling circuit modeling of the motor body, reserve the parameter interface of temperature in the modeling process, divide the cage bars into blocks along the groove depth direction, set the boundary conditions, carry out the finite element solution and then process to obtain a series of data required for subsequent calculations, the data includes different stator voltages, different rotational speeds, and different rotor temperatures. The electromagnetic torque Tem of the motor, the stator current Is, the cage bar loss Pbar, the end ring loss Pring, For the stator iron loss Pcore1 and the rotor iron loss Pcore2, the obtained data is exported to a database, and the data in the database is presented ...

Embodiment 3

[0083] As another preferred embodiment of the present invention, refer to the accompanying figure 2 , this embodiment provides a method for analyzing the starting performance of a squirrel motor, including the following steps:

[0084] S1. Carry out the finite element modeling and coupling circuit modeling of the motor body, reserve the parameter interface of temperature in the modeling process, divide the cage bars into blocks along the groove depth direction, set the boundary conditions, carry out the finite element solution and then process to obtain a series of data required for subsequent calculations, the data includes the electromagnetic torque of the motor and the loss of each component under different stator voltages, different rotational speeds, and different rotor temperatures, and export the obtained data to the database;

[0085] S2. Start the calculation from the speed of 0 and the starting temperature of the cage bar as the input, and perform two-dimensional in...

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Abstract

The invention discloses a cage type motor starting performance analysis method, which relates to the field of starting performance calculation, and comprises the following steps: S1, carrying out electromagnetic field finite element modeling and calculation, and establishing a database; s2, carrying out electromagnetic analysis iterative calculation in the starting process; s3, carrying out starting process transient heat transfer calculation; s4, carrying out mechanical calculation in the starting process; s5, performing judgment, if the angular acceleration is calculated and judged to be small enough, ending the calculation if the angular acceleration is small enough, and if the angular acceleration is small enough, performing two-dimensional interpolation from an electromagnetic torque calculation result database by taking the temperature of the next time step obtained in the S3 and the speed of the next time step obtained in the S4 as input, and outputting a result; s7, the steps S3-S6 are repeated until calculation is finished, the problem that pure analytical calculation is poor in reliability is avoided, the problem that the calculation amount is too large due to the fact that a pure transient finite element method is adopted for bidirectional coupling of an electromagnetic field and a temperature field is also avoided, and the method has the outstanding advantages of being high in calculation efficiency and higher in calculation precision.

Description

technical field [0001] The invention relates to the field of starting performance calculation, in particular to a starting performance analysis method of a large-capacity cage type motor. Background technique [0002] Large-capacity cage-type asynchronous motors tend to have large rotational inertia, large load resistance torque, and long starting time, which may last for tens of seconds in some cases. During the starting process, the starting current in the cage bars has a serious skin effect. It will cause a lot of loss on the rotor, causing the rotor temperature to rise rapidly, and the cage bar temperature changes and uneven distribution during the starting process, and will also produce different deformations, causing huge thermal stress, and may even damage the motor rotor in severe cases. Therefore, the rotor of the large-capacity squirrel asynchronous motor has a prominent problem of heating during the starting process, and its starting temperature rise is a key issu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F30/23G06F119/08
CPCG06F30/23G06F2119/08Y02T10/64
Inventor 李建富王超侯小全周光厚肖翦钱昌东
Owner DONGFANG ELECTRIC MACHINERY
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