A kind of permanent magnet synchronous motor inductance calculation method and inductance calculation device

Abstract

The invention provides a permanent magnet synchronous motor inductance calculation method and an inductance calculation device. The method includes: controlling d-axis and q-axis currents and d-axis and q-axis voltages, recording the first d-axis feedback current and / or the first q-axis feedback current when the current is stable; controlling the d-axis voltage to increase from the first d-axis voltage to the second d-axis voltage, and / or the q-axis voltage is increased from the first q-axis voltage to the second q-axis voltage, and when the current stabilizes, record the second d-axis feedback current and / or the second q-axis feedback current; control Decrease d-axis voltage to first d-axis voltage, and / or q-axis voltage to first q-axis voltage, and record step decrease or dip to first d-axis voltage and / or step decrease or dip To the moment of the first q-axis voltage, and record the moment when the second d-axis feedback current drops to the first preset current and / or the moment when the second q-axis feedback current drops to the second preset current; calculate the time interval, according to the time interval and resistor values ​​to calculate d-axis inductance and / or q-axis inductance.

Description

technical field [0001] The present invention relates to the technical field of permanent magnet synchronous motors, in particular to an inductance calculation method and an inductance calculation device for permanent magnet synchronous motors. Background technique [0002] Automotive electronic water pumps mostly use permanent magnet synchronous motors and vector control. The AC and D-axis inductance parameters of the permanent magnet synchronous motor have a great influence on the performance of vector control. If the performance needs to be improved, it is necessary to accurately measure the AC and D-axis inductance of the permanent magnet synchronous motor. [0003] Calculation methods in related technologies can be classified into methods using high-frequency injection, methods using voltage steady-state equations for motor rotation, or methods using circuit transient response for external locking of the rotor, and so on. The calculation of these methods often uses the ...

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Problems solved by technology

The calculation of these methods often uses the output voltage of the controller. The controller generally does not have output voltage detection and therefore uses the command voltage. However, because the controller output is affected by the dead zone and other nonlinear factors, there is a deviation between the command voltage and the actual voltage. , thus affecting the calculation accuracy of the AC and D axis inductance of the permanent magnet synchronous motor

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