Extraction method of permanent magnet synchronous motor stator flux linkage matrix and its application
A technology of permanent magnet synchronous motor and stator flux linkage, which is applied in the control of generator, motor generator control, electronic commutation motor control, etc., can solve the problems of not considering influence, measurement deviation, affecting motor control, etc. stability and consistency, accurate MTPA trajectory, and the effect of meeting accuracy requirements
Active Publication Date: 2019-06-18
NANJING ESTUN AUTOMATION CO LTD
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Problems solved by technology
[0015] The problem to be solved by the present invention is: the existing permanent magnet synchronous motor stator flux matrix measurement method does not consider the influence of magnetic saturation and dq mutual inductance, or does not consider the influence of dq axis current on the flux linkage of permanent magnet, or with ideal or assumed It will cause measurement deviation, and the existing measurement methods do not take into account the influence of the temperature rise of the permanent magnet on the flux matrix of the permanent magnet. It is difficult to ensure the accuracy of the measured value, which will also affect the subsequent motor control.
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[0046] The invention provides a method for measuring the stator flux matrix of a permanent magnet synchronous motor, especially for a highly saturated, dq-coupled embedded permanent magnet synchronous motor, and on this basis, a method for extracting the maximum torque-current ratio MTPA control trajectory is proposed method, the present invention not only considers the influence of magnetic saturation and dq coupling, but also considers the influence of the motor resistance and the temperature rise of the permanent magnet on the test result during the test process.
[0047] As shown in Figure 2, the test system used in the present invention includes the tested permanent magnet synchronous motor and position encoder, motor controller, current and voltage sampling device, dynamometer or drag motor and its controller. figure 2 The towing motor is used in the test, and the dynamometer can also replace the towing motor to make the motor under test rotate at a fixed speed. In the ...
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Provided is a stator flux linkage matrix extraction method for a permanent magnet synchronous electric motor. In the method, the magnetic saturation influence and the dq coupling influence are taken into consideration, and the influence of resistance of an electric motor and temperature rise of a permanent magnet on a test result during a test process is also taken into consideration. A stator flux linkage matrix of a permanent magnet synchronous electric motor is measured. For the measured stator flux linkage matrix of the permanent magnet synchronous electric motor, the magnetic saturation influence is taken into consideration, and the dq coupling influence is also taken into consideration. In addition, the influence of temperature rise of an electric motor winding and the permanent magnet during the testing process is also taken into consideration, and the testing result is compensated for using the method for measuring a no-load counter electromotive force of the electric motor by means of pulse blocking, thereby improving the accuracy and consistency of the testing result.
Description
technical field [0001] The invention belongs to the technical field of motor control, and relates to the measurement of a permanent magnet synchronous motor stator flux matrix, in particular to a permanent magnet synchronous motor stator flux matrix extraction method and its application. Background technique [0002] Permanent magnet synchronous motors have the characteristics of high power density, low moment of inertia, and high efficiency, and are widely used in servo devices with high precision, high reliability, and wide speed range. Among them, the embedded permanent magnet motor can further improve the overload capacity of the motor and widen the range of speed regulation because of the use of reluctance torque. In order to make full use of the motor material and space, the motor is often designed at the saturated operating point when overloaded. Nonlinear factors such as motor magnetic saturation and dq axis mutual inductance will seriously affect the performance of...
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IPC IPC(8): H02P21/14H02P21/22
CPCH02P21/14H02P21/22
Inventor 李子健钱巍
Owner NANJING ESTUN AUTOMATION CO LTD