Method for identifying inductance parameters of synchronous electric machine and realization system thereof
A technology of synchronous motor and inductance parameters, applied in control systems, control generators, vector control systems, etc., can solve problems such as detection and calculation difficulties, and achieve the effect of low sampling accuracy, easy implementation, and easy control.
Active Publication Date: 2015-01-14
SHENZHEN INVT ELECTRIC
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Problems solved by technology
[0011] For the DC inductance L of the synchronous motor in the above-mentioned prior art d and the quadrature axis inductance L q For the shortcomings of relatively difficult detection and calculation, the present invention provides a synchronous motor inductance parameter identification method and its implementation system. The method can statically identify the motor inductance parameter without adding hardware.
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[0042] This embodiment is a preferred implementation mode of the present invention, and other principles and basic structures that are the same or similar to this embodiment are within the protection scope of the present invention.
[0043]The main aspect of the present invention is a method for identifying the inductance parameters of a synchronous machine, which first determines the position of the rotor magnetic pole axis of the motor, obtains the d-q axis of the magnetic pole coordinate axis, and then injects a high-frequency voltage or current signal of a certain amplitude into the d-axis of the motor, Obtain the amplitude of the feedback high-frequency current or voltage component in the feedback high-frequency current or voltage of the d-axis with the same frequency as the injected high-frequency voltage or current, and calculate the d-axis according to the amplitude of the d-axis feedback high-frequency current or voltage component Inductance L d . In the present inve...
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The present invention discloses an inductance parameter identification method for a synchronous motor and an implementation system thereof, The method includes: determining the position of the rotor magnetic pole axis of the synchronous motor and obtaining direct-quadrature (d-q) axes; injecting a high-frequency voltage or current signal having a predetermined amplitude to the d-axis of the synchronous motor; obtaining the amplitude of a feedback high-frequency current or voltage component that has the same frequency as the injected high-frequency voltage or current of a feedback high-frequency current or voltage at the d-axis; and calculating d-axis inductance L d according to the amplitude of the feedback high-frequency current or voltage component at the d-axis. The present invention is easy to implement. It imposes no high requirements on the accuracy of the sampling of the feedback current from the synchronous motor. The frequency and amplitude of the high-frequency voltage signal injected to the synchronous motor are easy to control. Moreover, the d-axis inductance and q-axis inductance of the synchronous motor can be directly identified, whether the shaft of the synchronous motor is free or braked, without affecting the accuracy of identification.
Description
technical field [0001] The invention discloses an inductance parameter identification method and its realization system, in particular, a synchronous motor inductance parameter identification method and its realization system. Background technique [0002] Permanent magnet synchronous motor has the advantages of high power density, low loss, high efficiency, high power factor, suitable for direct drive, etc., and is more and more widely used in the field of electric transmission. In the early days, synchronous motors usually used vector control with encoder feedback or open-loop V / F control, and the application fields were greatly limited. At present, the speed sensorless vector control technology of synchronous motors has been mastered by a few frequency converter manufacturers and applied to fields such as plastics, machinery, oil fields, fans, and water pumps. Speed sensorless vector control usually adopts the rotor flux (ie permanent magnet flux) orientation strategy,...
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IPC IPC(8): H02P21/14
CPCH02P21/145H02P6/183H02P21/16
Inventor 王玉雷徐铁柱
Owner SHENZHEN INVT ELECTRIC