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A permanent magnet synchronous motor rotor position observation system and its observation method for suppressing position pulsation observation error

A technology of permanent magnet synchronous motor and observation error, applied in control system, control generator, vector control system, etc., can solve the problem that the 6th harmonic cannot be effectively reduced

Active Publication Date: 2015-08-19
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problem that the existing inverter nonlinear compensation and inductance accurate modeling methods cannot effectively reduce the 6th harmonic and eliminate its influence, so that the observed value contains 6th harmonic pulsation observation error problem, A permanent magnet synchronous motor rotor position observation system and its observation method are proposed to suppress the position pulsation observation error

Method used

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  • A permanent magnet synchronous motor rotor position observation system and its observation method for suppressing position pulsation observation error
  • A permanent magnet synchronous motor rotor position observation system and its observation method for suppressing position pulsation observation error
  • A permanent magnet synchronous motor rotor position observation system and its observation method for suppressing position pulsation observation error

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specific Embodiment approach 1

[0048] Specific implementation mode one: the following combination figure 1 , figure 2 This embodiment is described. A permanent magnet synchronous motor rotor position observation system that suppresses position pulsation observation errors described in this embodiment includes a back electromotive force estimator, a multi-designated harmonic elimination device based on a second-order generalized integrator, and a positive Interlocked phase-locked loop; Back EMF estimator 1 includes two proportional integral units, five subtractor units, one adder unit, four proportional gain units, two multiplier units, two with coefficient 1 / L d Integral unit 1 / L d s and two inverter cells;

[0049] The back electromotive force estimator 1 is respectively provided with the stator voltage of the α-axis under the two-phase static coordinates Input port, stator voltage of β axis Input port, stator current i of α-axis α Input port, stator current i of β axis β Input ports and rotor ang...

specific Embodiment approach 2

[0074] Specific implementation mode two: the following combination image 3 Describe this embodiment, this embodiment will further explain Embodiment 1, the multi-designated harmonic elimination device 2 based on the second-order generalized integrator described in this embodiment includes six second-order generalized integrator units, a frequency-locked loop unit, Four proportional gain units and twelve subtractor units;

[0075] The first second-order generalized integrator unit, the second second-order generalized integrator unit and the third second-order generalized integrator unit sequentially output the extracted α-axis estimated back electromotive force fundamental wave Estimating the 5th Harmonic of Back EMF by α-axis and α-axis to estimate the 7th harmonic of back EMF

[0076] The fourth second-order generalized integrator unit, the fifth second-order generalized integrator unit and the sixth second-order generalized integrator unit sequentially output the extr...

specific Embodiment approach 3

[0115] Specific implementation mode three: the following combination Figure 4 Describe this embodiment, this embodiment will further explain the second-order generalized integrator unit described in Embodiment 2, the second-order generalized integrator unit described in this embodiment is the first one described in Embodiment 2 The second-order generalized integrator unit is described as an example. The second-order generalized integrator unit described in this embodiment includes a No. 1 subtractor unit, a No. 2 subtractor unit, a proportional gain unit, a No. 1 multiplier unit, and a No. 2 multiplication unit. unit, integration unit No. 1 and integration unit No. 2;

[0116] The α axis estimated back electromotive force signal input terminal of the 5th and 7th harmonics of the first subtractor unit is the α axis estimated back electromotive force of the 5th and 7th harmonics of the second-order generalized integrator unit a signal input terminal, and the signal at the inpu...

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Abstract

The invention discloses a permanent magnet synchronous motor rotor position observation system for restraining position pulsation observation errors and an observation method of the permanent magnet synchronous motor rotor position observation system, and belongs to the field of motor control. The permanent magnet synchronous motor rotor position observation system for restraining the position pulsation observation errors and the observation method of the permanent magnet synchronous motor rotor position observation system are used for solving the problem that sixth harmonic cannot be effectively reduced through an existing inverter non-linear compensation method and an existing inductance precise modeling method. The permanent magnet synchronous motor rotor position observation system for restraining the position pulsation observation errors comprises a counter electromotive force estimation device, a multi-selection harmonic cancellation device based on a second-order generalized integrator, and an orthogonality phase-locked loop. The observation method of the permanent magnet synchronous motor rotor position observation system comprises the steps of obtaining counter electromotive force estimation information through a model method, carrying out signal processing of a multi-selection harmonic cancellation algorithm based on the second-order generalized integrator, carrying out fifth harmonic detection and compensation and seventh harmonic detection and compensation of counter electromotive force to eliminate the sixth harmonic pulsation errors in a rotor position observation value, and obtaining the rotor position observation value through the orthogonality phase-locked loop. The observation method of the permanent magnet synchronous motor rotor position observation system is a method used for eliminating the sixth rotor pulsation errors, and is applicable to the model method of the medium-and-high-speed sensorless permanent magnet synchronous motor control technology.

Description

technical field [0001] The invention belongs to the field of motor control. Background technique [0002] In recent years, with the development of motor control theory, permanent magnet material science, power electronics integration technology and high-performance microprocessor, the permanent magnet synchronous motor speed control system with integrated advanced control technology has been widely used in industry. Such as elevators, CNC machine tools, robots and frequency converters and other fields. Compared with the traditional asynchronous motor, the permanent magnet synchronous motor has many advantages such as small size, light weight, reliable operation, high power density, good speed regulation performance and strong adaptability to the environment, so the permanent magnet synchronous motor speed control system is gradually It has become a research hotspot in the field of AC variable speed drives. [0003] In order to obtain a high-performance permanent magnet syn...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P21/14
Inventor 王高林李卓敏曲立志丁力张国强倪荣刚徐殿国
Owner HARBIN INST OF TECH
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