Method for reconstructing current in non-observation area of permanent magnet synchronous motor
A permanent magnet synchronous motor and current reconstruction technology, which is applied in the control of generators, motor control, motor generator control, etc., can solve the problems that affect the motor control performance, and the phase current cannot be obtained in the non-observation area of the permanent magnet synchronous motor. Achieve the effect of increasing calculation time, improving control effect and increasing loss
Active Publication Date: 2022-06-24
四川奥库科技有限公司
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Problems solved by technology
[0007] In order to solve the problems existing in the prior art, the object of the present invention is to provide a current reconstruction method in the non-observation area of the permanent magnet synchronous motor to solve the problem that the phase current cannot be obtained in the non-observation area of the permanent magnet synchronous motor, which seriously affects the motor control performance Defects
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[0044] like figure 1As shown in Fig. 1, a current reconstruction method in the non-observation area of permanent magnet synchronous motor, firstly analyzes the current branch of the three-phase full-bridge voltage source inverter, and obtains the relationship between the current of each branch and the winding current under different voltage vectors, Then look up the table to get the phase current of the sampled current. time The state equation of the shaft current is estimated to be the current at the moment, after the pair The current in the coordinate system is Clarke inverse transformed to obtain the estimated three-phase current, and the proportional coefficient is obtained by using the three-phase current and the actual sampled current. , using the scale factor revised estimate Shaft current, and finally use the Clarke inverse transformation to obtain the reconstructed three-phase current.
[0045] The present embodiment is further described below, specific...
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The invention discloses a current reconstruction method for a non-observation area of a permanent magnet synchronous motor, which relates to the technical field of permanent magnet synchronous motor control, and comprises the following steps of: firstly, analyzing current branches of a three-phase full-bridge voltage source inverter to obtain a corresponding relation table of each branch current and winding current under different voltage vectors, and then looking up the table to obtain the phase current of the sampling current; the method comprises the following steps: estimating a state equation of a moment axis current to obtain a moment current, then carrying out Clarke inverse transformation on the current in a coordinate system to obtain an estimated three-phase current, obtaining a proportionality coefficient by using the three-phase current and a current obtained by real sampling, correcting the estimated axis current by using the proportionality coefficient, and finally obtaining a reconstructed three-phase current by adopting Clarke inverse transformation. The method solves the problem that the control performance of the motor is seriously influenced because the phase current cannot be obtained in the non-observation area of the permanent magnet synchronous motor.
Description
technical field [0001] The invention relates to the technical field of permanent magnet synchronous motor control, in particular to a current reconstruction method in a non-observation area of a permanent magnet synchronous motor. Background technique [0002] Permanent magnet synchronous motors are widely used in the field of motor control because of their simple structure, high efficiency, high power density, and low moment of inertia. In the permanent magnet synchronous motor drive system, real-time detection of the three-phase winding phase current and rotor position information of the motor is an indispensable condition for realizing closed-loop vector control, so it is necessary to introduce current sensors and position sensors. [0003] At present, the position sensor and current sensor still have shortcomings in the actual application process, such as increasing the system cost, reducing the service life of the motor, and affecting the reliability of the system. I...
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IPC IPC(8): H02P21/14H02P21/13H02P21/22H02P25/024H02P27/08
CPCH02P21/14H02P21/13H02P21/22H02P25/024H02P27/08H02P2207/05
Inventor 许德海赵鹏飞潘军朱绯陈跃任明艺
Owner 四川奥库科技有限公司