A method and system for vector control field orientation correction of asynchronous motor

A technology for asynchronous motors and field orientation, applied in vector control systems, control systems, motor control, etc., can solve the problems of difficult real-time and accurate acquisition of motor rotor parameters, inaccurate field orientation, etc.

Inactive Publication Date: 2019-01-08
HUNAN VICRUNS ELECTRIC TECH
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  • Abstract
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Problems solved by technology

[0013] In order to solve the above-mentioned problems existing in the prior art, the present invention provides a vector control field orientation correction method and system for an asynchronous motor. Accurately capture technical issues that lead to misorientation of the magnetic field

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  • A method and system for vector control field orientation correction of asynchronous motor
  • A method and system for vector control field orientation correction of asynchronous motor
  • A method and system for vector control field orientation correction of asynchronous motor

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Embodiment Construction

[0053] In order to make the purpose, technical solution and advantages of the present application clearer, the present application will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present application, and are not intended to limit the present application.

[0054] In one embodiment, such as figure 1 As shown, a method for field orientation correction of asynchronous motor vector control is provided, and the method includes the following steps:

[0055] Step S1, obtain the three-phase stator current i of the asynchronous motor a i b and i c , and get the motor angular velocity ω r ;

[0056] In this step S1, the three-phase stator current i of the asynchronous motor is obtained a i b and i c , and get the motor angular velocity ω r Specifically include:

[0057] Obtain the two-phase stator current i of the motor thro...

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Abstract

A method and system for vector control field orientation correction of asynchronous motor. The method comprises the following steps: obtaining three-phase stator currents ia, ib and ic of an asynchronous motor and an angular velocity omega r of the motor; D-axis current isd and q-axis current isq are obtained by 3s / 2r transformation of current ia, ib and ic, and output voltage amplitude Us is calculated by voltage equation of asynchronous motor; Calculate slip angular velocity increment coefficient Kslip and slip angular velocity omega slip of asynchronous motor; Calculate d-axis control voltage of asynchronous motor shown in the description q-axis control voltage shown in the description and dq axis combined voltage shown in the descrition and according to shown in the description and shown in the description. The SVPWM space vector pulse width modulation (SVPWM-SVPWM) is processed to control the operation of the motor. The invention relates to vector control magnetic field orientation correction of asynchronous motor based on voltage observation, By calculating d, q-axis control voltage shown in the description, Thus, the operation of the motor is controlled, the problem of inaccurate orientation of the magnetic field caused by the difficulty of real-time and accurate acquisition of the rotor parameters of the motor is solved, and at the same time, the d-axis and q-axis voltage observation is taken into account, so that the accurate magnetic field positioning can be realized in the full speed range.

Description

technical field [0001] The present application relates to the technical field of motor control, in particular to a method and system for field orientation correction of asynchronous motor vector control. Background technique [0002] The current three-phase AC asynchronous motor is widely used in the field of AC transmission due to its good control performance and dynamic response. In the process of implementing vector control of asynchronous motors, one of the key steps is to calculate the slip frequency of the motor. [0003] Calculating the slip frequency requires obtaining accurate motor rotor parameters. In practical applications, on the one hand, it is difficult to obtain the motor rotor parameters accurately, especially for high-power motors, because the rotor resistance and inductance parameters are small, the motor parameter identification error is larger; on the other hand, the motor rotor resistance is greatly affected by the motor temperature , the motor slip f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P21/26H02P27/08
CPCH02P21/26H02P27/08H02P2207/01
Inventor 朱伟进
Owner HUNAN VICRUNS ELECTRIC TECH
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