Induction motor parameter identification method

An induction motor and parameter identification technology, which is applied to the control of generators, motor generators, electronically commutated motors, etc., to achieve high accuracy and simple methods

Active Publication Date: 2017-02-22
CHINA FIRST AUTOMOBILE
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Problems solved by technology

But this method is only suitable for the vector control system based on the indirect field orientation of the rotor flux linkage

Method used

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  • Induction motor parameter identification method
  • Induction motor parameter identification method

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Embodiment 1

[0049] reference figure 1 This embodiment provides a method for identifying parameters of an induction motor, which includes the following steps according to the identification sequence of the electrical parameters of the induction motor:

[0050] S10, identify motor stator phase resistance R s ; Among them, the system structure diagram for identifying the stator phase resistance of the motor is as follows figure 2 Shown.

[0051] In this embodiment, the volt-ampere method is used to identify the stator phase resistance of the motor, that is, two-phase windings can be energized with direct current or three-phase windings can be energized with direct current. Theoretically, the phase resistance value can be obtained by dividing the steady-state phase voltage by the phase current. However, due to the influence of the inverter's nonlinear characteristics (interlock time, tube voltage drop, turn-on and turn-off delay, etc.), the voltage applied to each phase winding of the motor cann...

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Abstract

The invention discloses an induction motor parameter identification method. The method comprises steps of S10, identifying motor stator phase resistance Rs; S2, identifying motor stator phase leakage inductance Lssigma; S30, identifying motor stator / rotor equivalent excitation inductance Lm, equivalent stator self-inductance Ls and equivalent rotor self-inductance Lr; S40, detecting a motor rotor time constant initial value Tr0; S50, calculating a rotor resistor initial value Rr0; S60, calculating a rotor resistor correction value Rr; and S70, calculating a motor rotor time constant correction value Tr. Through the method, not any equipment is required to add such as a three-phase voltage regulator and a three-phase power meter, and online induction motor parameter identification vector control is carried out. The method is advantaged in that the method is simple and easy for operation, and quite high accuracy is realized.

Description

Technical field [0001] The invention relates to the technical field of motor control, in particular to a method for obtaining induction motor parameters in a vector control variable frequency speed regulation system. Background technique [0002] The induction motors used in electric vehicles and hybrid vehicles mainly use vector control for variable frequency drive, and the performance of the vector control system completely depends on the accuracy of the motor parameters used in the control strategy. Some parameters calculated from the induction motor nameplate data or the data in the product manual usually have a large deviation. If the motor parameters are inaccurate, it will lead to inaccurate field orientation, lower system efficiency, worse torque output accuracy, and even loss of control of the system in severe cases. [0003] Induction motor parameter identification mainly has two methods: offline identification and online identification. Offline identification mainly in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P21/00H02P21/14H02P21/16
CPCH02P21/0017H02P21/14
Inventor 刘博强常城赵慧超
Owner CHINA FIRST AUTOMOBILE
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