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Dead-beat based direct torque control method for permanent magnet synchronous motor

A permanent magnet synchronous motor, direct torque control technology, applied in motor generator control, AC motor control, electronic commutation motor control and other directions, can solve the problem of non-constant switching frequency, large torque and flux linkage, etc. Achieve constant switching frequency, reduce flux linkage and torque ripple, and simple structure

Inactive Publication Date: 2014-03-26
XI AN JIAOTONG UNIV
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  • Abstract
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  • Application Information

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Problems solved by technology

[0044] The purpose of the present invention is to provide a direct torque control method for permanent magnet synchronous motors based on deadbeat, so as to solve the problems of large torque and flux linkage pulsation and inconstant switching frequency caused by existing control methods

Method used

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  • Dead-beat based direct torque control method for permanent magnet synchronous motor
  • Dead-beat based direct torque control method for permanent magnet synchronous motor
  • Dead-beat based direct torque control method for permanent magnet synchronous motor

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Embodiment Construction

[0082] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0083] In order to realize the dead-beat control of torque and flux linkage, it is necessary to analyze the positional relationship between the flux linkage vectors in one switching period, and by analyzing and predicting the positional relationship between the flux linkage vectors in one switching period, find The space voltage vector should be applied to the motor, and this space voltage vector can accurately compensate the difference between the flux linkage reference value and the actual value and the difference between the torque reference value and the actual value at the same time. Figure 19 Shown is the positional relationship between the flux linkage vectors in the switching cycle from k-1 time to k time.

[0084] Assuming that the current moment is k-1 moment, by Figure 19 The positional relationship between the flux linkage vectors shown, we can...

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Abstract

The invention discloses a dead-beat based direct torque control method for a permanent magnet synchronous motor. Errors between given magnetic linkage amplitude and actual magnetic linkage amplitude as well as between given torque amplitude and actual torque amplitude are compensated accurately and simultaneously within a control cycle, and dead-beat control of magnetic linkage and torque is realized. Meanwhile, a space voltage vector modulation method is introduced into a control system to enable switching frequency to be constant. By the control method, system performance can be well improved, magnetic linkage and torque pulsation can be lowered obviously, dynamic response speed of the torque is equivalent to that of a conventional direct torque control scheme, and the direct torque control method basically keeps the advantages of simple structure and fast dynamic torque response.

Description

【Technical field】 [0001] The invention relates to the technical field of motor control, in particular to a control method of a permanent magnet synchronous motor. 【Background technique】 [0002] In the traditional permanent magnet synchronous motor direct torque control system, according to the output of the two hysteresis controllers of torque and flux linkage and the location of the stator flux linkage, the appropriate voltage space vector is selected from the switch table for the torque and flux linkage of the motor. Take control. But the voltage space vector that can be selected is limited, and the selection of the voltage space vector in the switch table is relatively rough, so it will bring about the problem of large pulsation of torque and flux linkage. Moreover, because only the voltage space vector is selected without using the space voltage modulation method, the switching frequency will not be constant, which is not conducive to the hardware design of the inverte...

Claims

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Application Information

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IPC IPC(8): H02P21/00H02P27/12
Inventor 王跃王斌
Owner XI AN JIAOTONG UNIV
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