Fault-tolerant control method for position sensor of switched reluctance motor

Patent metadata

Field	Value
Publication number	US-9923496-B2
Application number	US-201515533878-A
Country	US
Kind code	B2
Filing date	Aug 20, 2015
Priority date	Dec 8, 2014
Publication date	Mar 20, 2018
Grant date	Mar 20, 2018

Abstract

A fault-tolerant control method for a position sensor of a switched reluctance motor, if the position sensor of the switched reluctance motor runs without a fault, detecting, in real time, four equal-interval or equal-angle continuous edge pulses of an output signal of the position sensor, the fourth edge pulse being the current edge pulse, and detecting time intervals (T 1 , T 2 , T 3 ) between each two adjacent edge pulses sequentially, thereby calculating a time interval (T 4 ) between the current edge pulse and a next edge pulse following the current edge pulse. If the position sensor of the switched reluctance motor fails, and the next edge pulse following the current edge pulse is lost, reconstructing the next edge pulse after the interval time (T 4 ) of the current edge pulse of the output signal of the position sensor. The method can be used, when one or more position sensors of a rotatory and linear switched reluctance motor having various phases and various topology structures fail, to reconstruct an edge pulse after lost.

First claim

The invention claimed is:

1. A fault-tolerant control method for position sensor of switched reluctance motor, comprising:
when the position sensors in a switched reluctance motor operate without fault, four consecutive equal-space or equal-angle edge pulses in the output signals of the position sensors are detected in real time, wherein, the fourth edge pulse is the current edge pulse, and, in a chronological order, the third edge pulse is earlier than the fourth edge pulse, the second edge pulse is earlier than the third edge pulse, and the first edge pulse is earlier than the second edge pulse, the time interval between the first edge pulse and the second edge pulse is T 1 , the time interval between the second edge pulse and the third edge pulse is T 2 , and the time interval between the third edge pulse and the fourth edge pulse is T 3 , the time interval T 4 between the next edge pulse right after the current edge pulse and the current edge pulse is calculated according to the following formula:

T
4

=

-
B

+

B
2

-

4
⁢

⁢
AC

2
⁢

⁢
A

(
1
)

A
=

T
1

⁡

(

T
1

+

T
2

)

⁢

(

T
2

-

T
3

)

2

T
3

⁡

(

T
2

+

T
3

)

⁢

(

T
1

-

T
2

)

(
2
)

B
=

T
1

⁡

(

T
1

+

T
2

)

⁢

(

T
2

-

T
3

)

2

+

T
2

⁡

(

T
2

+

T
3

)

2

⁢

(

Assignees

• Univ China Mining

Inventors

• Chen Hao
• Han Guoqiang
• Cheng He
• Wang Qianlong
• Wang Qing
• Wang Xing

Classifications

• H02P25/0925 Primary

  wherein the converter comprises only one switch per phase · CPC title

• H02P6/16 Primary

  Circuit arrangements for detecting position · CPC title

• H02P25/08 Primary

  Reluctance motors · CPC title

• H02P25/092

  Converters specially adapted for controlling reluctance motors · CPC title

• H02P6/12

  Monitoring commutation; Providing indication of commutation failure · CPC title