Current decoupling control method for permanent magnet synchronous motor

A technology of permanent magnet synchronous motor and control method, which is applied in the direction of motor generator control, electronic commutation motor control, control of electromechanical brakes, etc., can solve the problems of incomplete decoupling and poor current control effect, etc. Accurate, stable motor operation and high current control accuracy

Inactive Publication Date: 2017-11-28
AUX AIR CONDITIONING LTD BY SHARE LTD
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Problems solved by technology

However, this method does not fully consider the influence of the quadrature axis component of the back electromotive force when there is a coordinate error, resulting in incomplete decoupling and poor current control effect

Method used

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  • Current decoupling control method for permanent magnet synchronous motor
  • Current decoupling control method for permanent magnet synchronous motor
  • Current decoupling control method for permanent magnet synchronous motor

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Embodiment Construction

[0046] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0047] Such as figure 2 As shown, the permanent magnet synchronous motor current decoupling control method in this embodiment is characterized in that it includes a direct axis current control method and a quadrature axis current control method;

[0048] The direct axis current control method is:

[0049] Get the output voltage U of the direct axis current regulator do , the direct-axis current regulator in this embodiment adopts a proportional-integral regulator, and the expression is as follows;

[0050] u d0 = K p (I d-ref -I d )+K i ∫(I d-ref -I d )dt (Formula 11);

[0051] where K p is the scaling factor, K i is the integral factor, I d-ref is the direct axis current reference value corresponding to the current sampling point;

[0052] Calculate the induced voltage L generated by the quadrature axis rotating current q Iq ω...

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Abstract

The invention relates to a current decoupling control method for a permanent magnet synchronous motor. By taking influence of position detection or position estimation error into consideration, a direct current component and a quadrature-axis component of counter electromotive force in an error coordinate system are further used as decoupling items; the direct-axis current control expression is a formula which is as shown in the specification; and the quadrature-axis current control expression is a formula which is as shown in the specification. By virtue of the current decoupling control method for the permanent magnet synchronous motor, more accurate decoupling items can be obtained by calculation, and a better current decoupling effect for the permanent magnet synchronous motor and a better motor control effect can be achieved.

Description

technical field [0001] The invention relates to the technical field of motor control, in particular to a method for current decoupling control of a permanent magnet synchronous motor. Background technique [0002] Permanent magnet synchronous motors have been widely used in industry due to their small volume and weight, high power factor and good control performance. When the vector control technology is used to adjust the speed of the permanent magnet synchronous motor, there is a certain coupling between the direct-axis and quadrature-axis currents. Usually, the direct-axis and quadrature-axis currents can be decoupled to improve the control performance of the system. [0003] The permanent magnet synchronous motor voltage equation is: [0004] [0005] [0006] in: [0007] u d is the direct axis voltage of the permanent magnet synchronous motor in the rotating coordinate system, U q is the quadrature axis voltage of the permanent magnet synchronous motor in the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P21/24
CPCH02P21/24
Inventor 卓森庆
Owner AUX AIR CONDITIONING LTD BY SHARE LTD
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