Permanent magnet synchronous motor control method based on virtual signal injection and gradient descent method

Abstract

The invention discloses a permanent magnet synchronous motor control method based on a virtual signal injection and gradient descent method. In the real-time control process of a permanent magnet synchronous motor, a virtual signal is injected under a coordinate system, an angle reference value of a stator current vector is obtained by utilizing a virtual signal injection method and a gradient descent method, a reference value of a stator current vector axial component is obtained by adopting a torque compensation calculation method, a stator current vector reference value under a d-q coordinate system is further obtained by coordinate transformation, and a gradient value under the coexistence of the maximum current torque ratio control and weak magnetic control is corrected and controlled, so that seamless switching between the maximum current torque ratio control and the weak magnetic control is achieved. According to the invention, the gradient expression is corrected by introducingvoltage feedback, seamless switching between the maximum current torque ratio control and the weak magnetic control can be achieved, the rotating speed range is wide, complex signal processing is notrequired, and the dynamic response performance is good.

Description

technical field [0001] The invention relates to a control method of a permanent magnet synchronous motor, and in particular proposes a high-efficiency and high-performance control method for a wide speed range of a built-in permanent magnet synchronous motor, which involves the maximum torque-current ratio based on virtual signal injection control and field weakening control. Background technique [0002] Due to the anisotropy of the magnetic circuit, the d-axis and q-axis inductance of the interior permanent magnet synchronous motor are not equal, so the torque of the interior permanent magnet synchronous motor includes two parts: permanent magnet torque and reluctance torque. There is an optimal combination between these two parts, so that the stator current is the smallest under the same torque. This operating state is called the maximum torque current ratio control. When the motor speed is below the base speed, since the copper loss accounts for a large proportion, the ...

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Problems solved by technology

[0005] In order to solve the problems existing in the prior art, the object of the present invention is to provide a maximum torque-to-current ratio and a field-weakening control method of the built-in permanent magnet synchronous motor based on virtual signal injection and gradient descent method, which can be changed in parameters The control of the maximum torque-current ratio can be realized under the condition of the maximum torque-current ratio, and the smooth switching between the maximum torque-current ratio and the field-weakening control can be ensured. Seamless switching between control and field weakening control

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