Determination of the movement of a synchronous machine

Patent metadata

Field	Value
Publication number	US-9758342-B2
Application number	US-94151710-A
Country	US
Kind code	B2
Filing date	Nov 8, 2010
Priority date	May 30, 2008
Publication date	Sep 12, 2017
Grant date	Sep 12, 2017

Abstract

Methods and an apparatuses for determining the movement of a synchronous machine are provided. An apparatus for determining the movement of a synchronous machine includes a determination for at least one electrical magnitude of the synchronous machine; a determination of the position error of the rotor of the synchronous machine, which is fitted to determine the position error of the rotor on the basis of the aforementioned at least one electrical magnitude of the synchronous machine; and also a correction of the movement signal of the incremental sensor, which is fitted to correct the read movement signal of the incremental sensor on the basis of the aforementioned determination of the position error of the rotor of the synchronous machine.

First claim

The invention claimed is:

1. Method for determining the movement of a synchronous machine, the method comprising:
fitting an incremental sensor to a rim of a traction sheave of the synchronous machine at a fitting point such that the incremental sensor detects relative motion of a surface of a moving part at the fitting point;
reading a movement signal of the incremental sensor, the movement signal of the incremental sensor representing a relative movement of the surface of the moving part at the fitting point;
determining at least one electrical magnitude of the synchronous machine;
determining a position error of the moving part of the synchronous machine based on said at least one electrical magnitude and a transmission ratio determined by a linear movement range detected by the incremental sensor at the fitting point;
filtering the position error with a low-pass filter;
correcting the read movement signal of the incremental sensor based on said filtered position error by repetitively summing a correction term, which is proportional to a magnitude of the position error, into the read movement signal such that cumulative movement signal errors and errors caused by variations or changes in the linear movement range are accounted for; and
supplying the corrected movement signal to a controller for controlling the synchronous machine.

2. Method according to claim 1 :
said determining a position error includes using information about the source voltage of the synchronous machine conveyed by said electrical magnitude to determine the position error.

3. Method according to claim 1 or 2 , the method further comprising:
determining a maximum permitted travel distance of an essentially low speed of the synchronous machine based on said position error.

4. The method of claim 1 , said fitting including fitting the incremental sensor onto the moving part via a friction wheel.

5. The method of claim 1 , said reading a movement signal including reading a measurement of linear distance traveled by the fitting point.

6. The method of claim 1 , said incremental sensor including a tachometer, and said reading a movement signal including reading a rotation speed measured by the tachometer.

7. The method of claim 1 , said moving part including a rotor, said fitting point of the incremental sensor being a rim of the rotor, and said transmission ratio being further determined by a diameter of the rotor.

8. Apparatus for determining the movement of a synchronous machine, having an input for a movement signal of an incremental sensor, the apparatus comprising:
the incremental sensor fitted to a surface of a moving part of the synchronous machine at a fitting point such that the incremental sensor detects relative motion of the surface of the moving part at the fitting point and the movement signal of the incremental sensor represents the relative movement of the surface of the moving part at the fitting point;
an electrical magnitude detector for determining at least one electrical magnitude of the synchronous machine;
a position error determination unit that determines position error of the moving part of the synchronous machine based on said determined electrical magnitude and a transmission ratio determined by a linear movement range detected by the incremental sensor at the fitting point;
a low-pass filter that filters the position error; and
a signal correction unit that corrects the input movement signal of the incremental sensor based on the filtered position error by repetitively summing a correction term, which is proportional to a magnitude of the position error, into the input movement signal such that cumulative movement signal errors and errors caused by variations or changes in the linear movement range are accounted for and supplies the corrected movement signal to a controller for controlling the synchronous machine.

9. Apparatus according to claim 8 , where the position error determination unit is configured to use information about the source voltage of the synchronous machine conveyed by said electrical magnitude for determining the position error.

10. Apparatus according to claim 8 or 9 , the apparatus further comprising:
a maximum permitted travel distance determination unit that determines a maximum permitted travel distance of an essentially low speed of the synchronous machine based on the determined position error.

11. The apparatus of claim 8 , where the incremental sensor is fitted onto the moving part via a friction wheel.

12. The apparatus of claim 8 , where the input movement signal includes a measurement of linear distance traveled by the fitting point.

13. The apparatus of claim 8 , where the incremental sensor includes a tachometer, and where the input movement signal includes information about a rotation speed measured by the tachometer.

14. The apparatus of claim 8 , where the moving part is a rotor and the fitting point of the incremental sensor is on a side of the rotor, and said transmission ratio being further determined by a radius from a center of the rotor to the fitting point.

15. The apparatus of claim 8 , said moving part including a rotor, the fitting point of the incremental sensor being a rim of the rotor, and said transmission ratio being further determined by a diameter of the rotor.

16. System for determining the movement of a conveying apparatus, the system comprising:
a synchronous motor for moving the conveying apparatus;
an incremental sensor fitted to a surface of a moving part in connection with the synchronous motor at a fitting point such that the incremental sensor detects relative motion of the surface of the moving part at the fitting point, the incremental sensor producing a movement signal that represents the relative movement of the surface of the moving part at the fitting point;
an electrical magnitude determination unit for determining at least one electrical magnitude of the synchronous motor
a position error determination unit for determining a position error of the moving part of the synchronous motor, said position error determination unit being fitted to determine the position error of the moving part based on said at least one electrical magnitude and linear movement range detected by the incremental sensor the fitting point;
a low-pass filter that filters the position error;
a movement signal correction unit for making correction of the movement signal of the incremental sensor, said movement signal correction unit being fitted to correct a read movement signal of the incremental sensor based on said filtered position error by repetitively summing a correction term, which is proportional to a magnitude of the position error, into the read movement signal such that cumulative movement signal errors and errors caused by variations or changes in the linear movement range are accounted for;
a movement determination unit for determining movement of the conveying apparatus, said movement determination unit being fitted to determine the movement of the conveying apparatus on the basis of the corrected movement signal of the incremental sensor.

17. System according to claim 16 , where said at least one electrical magnitude includes information about a source voltage of the synchronous motor; and
where the position error determination unit is configured to determine the position error of the moving part of the synchronous motor using the information about the source voltage.

18. System according to claim 16 or 17 , the system further comprising:
a permitted travel distance determinati

Assignees

• Stolt Lauri
• Kauppinen Tuukka
• Kone Corp

Inventors

• Stolt Lauri
• Kauppinen Tuukka

Classifications

• H02P2203/01

  Motor rotor position determination based on the detected or calculated phase inductance, e.g. for a Switched Reluctance Motor · CPC title

• H02P6/185

  using inductance sensing, e.g. pulse excitation · CPC title

• B66B1/30 Primary

  effective on driving gear {, e.g. acting on power electronics, on inverter or rectifier controlled motor} · CPC title

• H02P2203/05

  Determination of the rotor position by using two different methods and/or motor models · CPC title

• H02P6/16

  Circuit arrangements for detecting position · CPC title