A parameter detection method of permanent magnet synchronous motor

Abstract

The invention discloses a parameter detection method of a permanent magnet synchronous motor. Perform maximum torque-current ratio and vector control on the permanent magnet synchronous motor to make the permanent magnet synchronous motor run stably and normally; when the permanent magnet synchronous motor is running stably and normally, the three-phase current sampling through the permanent magnet synchronous motor passes through three phases to two phases Transform to obtain the α-axis current and β-axis current, and obtain the rotor position angle and electrical speed of the permanent magnet synchronous motor by reading the sensor on the permanent magnet synchronous motor; process the above six physical quantities using the recursive least square method to obtain the stator resistance at the same time , d-axis inductance, q-axis inductance and flux linkage four parameter results. The invention can directly detect all parameters of the permanent magnet synchronous motor, has faster convergence speed and shorter calculation time, and has higher real-time performance.

Description

technical field [0001] The invention relates to a permanent magnet synchronous motor parameter detection method in the field of permanent magnet synchronous motor detection, in particular, a parameter based on the voltage equation and the recursive least square method (RLS) under the αβ coordinate system of the permanent magnet synchronous motor is proposed Detection method. Background technique [0002] Motor online parameter detection plays an important role in applications such as motor real-time control and fault diagnosis. Generally, the motor parameters that need to be identified online in permanent magnet synchronous motors include stator resistance R s , d-axis inductance L d , q-axis inductance L q with flux linkage ψ f . At present, most of the literature on motor parameter detection focuses on the motor voltage equation under the dq coordinate system. However, the voltage and current under the dq coordinate system are basically constant. Usually, only one par...

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Problems solved by technology

However, the voltage and current under the dq coordinate system are basically constant. Usually, only one parameter can be processed and obtained by using a d-axis or q-axis voltage equation, so only two motor parameters can be processed and obtained at the same time in the steady state under the dq coordinate system.

[0003] Therefore, the detection of permanent magnet synchronous motor parameters under the dq coordinate system has the problem of lack of rank, and it is impossible to detect all parameters at the same time

Some studies have shown that the method of signal injection can increase the equation to detect all parameters at the same time, but this will affect the normal operation of the motor

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