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High-precision electrically excited synchronous motor flux linkage observation method

A synchronous motor, electric excitation technology, applied in the direction of motor generator control, electronic commutation motor control, control generator and other directions, can solve problems such as unpublished patent applications, achieve strong versatility, small overshoot, realize handy effect

Pending Publication Date: 2021-10-01
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] There is no public patent application in the relevant technical field in China

Method used

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  • High-precision electrically excited synchronous motor flux linkage observation method
  • High-precision electrically excited synchronous motor flux linkage observation method
  • High-precision electrically excited synchronous motor flux linkage observation method

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Experimental program
Comparison scheme
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Embodiment Construction

[0044] The concrete implementation of the present invention divides following 3 steps:

[0045] 1. If figure 1 As shown, the electric excitation synchronous motor flux observation module based on the current model is formed. In the dq rotating coordinate system, the current equation and the flux equation are respectively

[0046]

[0047]

[0048] In the formula, i ud i uq are the excitation current components decomposed on the d and q axes respectively; i sd i sq are the d and q axis components of the three-phase stator current; i fd is the d-axis component of the excitation current; l ad , l aq The d and q axis components of the main inductance are respectively, and l ad >l aq ; d 、ψ q are the d and q axis components of the flux linkage, respectively.

[0049] According to the double reaction theory of synchronous motor, the relationship between motor flux linkage and current is

[0050]

[0051] In the formula, T Dd , T Dq are the open-circuit time c...

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Abstract

The invention discloses an electrically excited synchronous motor flux linkage observation method, which comprises the following steps: 1) obtaining an electrically excited synchronous motor flux linkage observation module by using a current model; 2) forming a flux linkage observation module by using a new voltage model based on a phase-locked loop principle; and 3) forming an electrically excited synchronous motor comprehensive flux linkage observation module which transits from a current model to the new voltage model. According to the high-precision electrically excited synchronous motor flux linkage observation method provided by the invention, only measurable and easy-to-measure input variables and two selection switches are needed, and an additional complex device does not need to be added; and the method is wide in applicable speed range, is not influenced by the rated speed of the motor, and is high in universality.

Description

technical field [0001] The invention relates to a method for observing the flux linkage of an electric excitation synchronous motor, which belongs to the technical field of vehicle motor control application. Background technique [0002] The vigorous development of new energy vehicles has put forward higher requirements on the performance of the drive motor, one of the three electric vehicles. There are two types of commonly used drive motors: asynchronous motors and synchronous motors, each with its own characteristics. The rotor of asynchronous motor is simple and reliable, and is widely used in industry, but its power factor and efficiency are low. Synchronous motors can be divided into electrically excited synchronous motors and permanent magnet synchronous motors. Electrically excited synchronous motors have outstanding advantages such as adjustable power factor, low loss, high efficiency, simple structure, high reliability, and no need for permanent magnets, and have...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P21/13H02P21/28H02P25/022
CPCH02P21/13H02P21/28H02P25/022H02P2207/05
Inventor 蔡峰李可孙晓东陈龙周剑邬江陵
Owner JIANGSU UNIV