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Asynchronous motor rotor flux linkage and torque closed-loop control method

A rotor flux linkage and asynchronous motor technology, which is applied in motor control, motor generator control, AC motor control, etc., can solve the problems of approximately constant limited flux linkage and precise magnetic field orientation, etc., and achieves strong versatility, reasonable design, The effect of simple structure

Pending Publication Date: 2020-05-12
GUANGXI UNIV
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AI Technical Summary

Problems solved by technology

[0003] For a long time, in the design of the control system of the motor, the precise modulation of the time-varying magnetic field and the flux linkage amplitude has been ignored for a long time. FOC uses multiple parameters (rotor resistance, inductance), complex coordinate transformation (multi-space), and multiple time scales. Decoupled control of moment flux linkage, limited by assumptions of approximately constant flux linkage and precise field orientation

Method used

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  • Asynchronous motor rotor flux linkage and torque closed-loop control method
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  • Asynchronous motor rotor flux linkage and torque closed-loop control method

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Embodiment Construction

[0044] The specific embodiment of the present invention will be further described below in conjunction with accompanying drawing:

[0045] Such as figure 1 and 2 Shown, a kind of asynchronous motor rotor flux linkage and torque closed-loop control method, described method comprises the following steps:

[0046] S1), signal acquisition, real-time acquisition of converter DC side voltage U dc , Asynchronous motor three-phase stator current i sa(k), i sb (k), i sc (k) and speed ω(k); wherein, the DC side voltage U of the converter dc Acquired by a voltage sensor, the three-phase stator current i of the asynchronous motor sa (k), i sb (k), i sc (k) The current sensor is used to collect the abc three-phase current measurement values ​​at the endpoints of the induction motor in real time, and the rotational speed ω(k) is obtained by using an encoder.

[0047] S2), according to the drive signal S of the converter a , S b , S c and DC side voltage U dc Calculate the three...

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Abstract

The invention discloses an asynchronous motor rotor flux linkage and torque closed-loop control method, and the method comprises the steps of signal acquisition, flux linkage observation, standardizedtorque and reactive torque calculation, rotating speed and rotor flux linkage outer-loop control, standardized torque and reactive torque inner-loop control and an SVPWM modulation module. Accordingto the invention, the reactive acting force-reactive torque of the asynchronous motor is constructed, corresponds to the reactive acting component of the electromagnetic torque along the magnetic fluxdirection (radial direction), and corresponds to the reactive power. According to the invention, a layered control design structure is adopted for flux linkage and torque; a fast-changing reactive torque regulator and a torque regulator are arranged in an inner ring; the rotor flux linkage and the rotating speed regulator are arranged on the outer ring, so multi-time-scale dynamic stable controlof the system and decoupling control of the flux linkage and the torque are achieved. The asynchronous motor torque response speed control method is reasonable in design, simple in structure and highin universality; compared with a traditional FOC method, the method increases the torque response speed of the asynchronous motor.

Description

technical field [0001] The invention relates to the technical field of motor control, in particular to a closed-loop control method for rotor flux linkage and torque of an asynchronous motor. Background technique [0002] In order to obtain high-quality control effects, the following characteristics are required for the asynchronous motor control system: reliability and robustness of operating performance, rapidity, high efficiency, fast dynamic response, and practical application capabilities and reasonable hardware costs. The idea of ​​Flux Oriented Control (FOC) is: transform the stator current into the DC flow in the rotating coordinate system, adjust the d-q current independently, and have high steady-state accuracy, but the corresponding speed of the torque is limited by the bandwidth of the current loop. The calculation error of orientation angle will reduce the effect of torque and flux linkage decoupling control and system stability. [0003] For a long time, in th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P21/06H02P21/13H02P21/14H02P25/02H02P27/08
CPCH02P21/06H02P21/13H02P21/141H02P21/0003H02P25/02H02P27/08H02P2207/01H02P2205/05
Inventor 卢子广刘朦林靖宇杨帅帅
Owner GUANGXI UNIV
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