Linear hall-based eccentricity diagnosis method and detection system for permanent magnet motor

Patent metadata

Field	Value
Publication number	US-12474156-B2
Application number	US-202118279211-A
Country	US
Kind code	B2
Filing date	Nov 29, 2021
Priority date	Sep 8, 2021
Publication date	Nov 18, 2025
Grant date	Nov 18, 2025

Abstract

A linear Hall-based eccentricity diagnosis method and detection system for a permanent magnet motor. First, three linear Hall elements are mounted in stator slots at the same space interval, respectively; second, analog signals output by the three-phase linear Hall are converted into digital signals by means of a digital signal processor, and the digital signals are converted into a quadrature signal by means of linear combination; then, a negative sequence signal and a sideband signal are extracted from the quadrature signal by means of a complex factor filter; then the amplitude of the negative sequence signal and the amplitude of the sideband signal are extracted by means of synchronous reference frame phase-locked loops as a static eccentricity indicator and a dynamic eccentricity indicator; finally, percentages representing the degrees of eccentricity are calculated from the static eccentricity indicator and the dynamic eccentricity indicator in the digital signal processor.

First claim

What is claimed is:

1 . A linear Hall-based eccentricity diagnosis method for a permanent magnet motor, wherein a first linear Hall element, a second linear Hall element and a third linear Hall element are mounted in the stator slots at the same space interval in a circumferential direction, and magnetically sensitive surfaces of the first to third linear Hall elements are all opposite surfaces of a rotor with permanent magnets, the method comprising:
linearly combining output voltages of the first to third linear Hall elements to obtain a quadrature signal containing a pair of quadrature components and a DC component; extracting positive sequence signals, negative sequence signals and sideband signals from the quadrature signal; extracting the amplitude of the negative sequence signals thereby taken as a static eccentricity indicator; extracting the amplitude of the sideband signals thereby taken as a dynamic eccentricity indicator; obtaining a static eccentricity percentage by the ratio of the static eccentricity indicator to the amplitude of the positive sequence signals; and obtaining a dynamic eccentricity percentage by the ratio of the dynamic eccentricity indicator to the amplitude of the positive sequence signals.

2 . The linear Hall-based eccentricity diagnosis method for the permanent magnet motor according to claim 1 , wherein the quadrature signal containing a pair of quadrature components and a DC component obtained by a linear combination of the output voltages of the first to third linear Hall elements is expressed as: H αβ0 =T APS H αβ0 , in which H abc is a vector composed of the output voltages of the first to third linear Hall elements; H abc =[H a , H b , H c ] T , in which H a is the output voltage of the second linear Hall element, H b is the output voltage of the first linear Hall element, H c is the output voltage of the third linear Hall element, and H αβ0 is the quadrature signal; H αβ0 =[H α H β , H 0 ] T , in which H α and H β are the quadrature components, H 0 is the DC component, and T APS is a linear combination coefficient matrix;

T
APS

=

K
[

1

cos
⁢

φ
s

cos
⁢

φ
s

0

sin
⁢

φ
s

-
sin

⁢

φ
s

-
cos

⁢

φ
s

1
/
2

1
/
2

]

,

K
=

[

1

1
+

2
⁢

cos
2

⁢

φ
s

0

-

1
+

2
⁢
cos
⁢

φ
s

(

1
-

cos
⁢

φ
s

)

⁢

(

1
+

2
⁢

cos
2

⁢

φ
s

)

0

Assignees

• Univ Southeast

Inventors

• Hua Wei
• Wang Yuchen
• Zhang Chao
• Liu Kai

Classifications

• G01R33/072 Primary

  Constructional adaptation of the sensor to specific applications · CPC title

• G01B7/312 Primary

  for measuring eccentricity, i.e. lateral shift between two parallel axes · CPC title

• G01R31/343

  in operation · CPC title

• G01R31/34

  Testing dynamo-electric machines · CPC title