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Position estimation at starting and lower speeds in three-phase switched reluctance machines

A reluctance motor, phase technology, used in AC motor control, electrical components, control systems, etc.

Inactive Publication Date: 2012-05-09
THE UNIVERSITY OF AKRON
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In some embodiments, the methods and assumptions used in the process limit performance at low, zero, or near-zero speeds

Method used

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  • Position estimation at starting and lower speeds in three-phase switched reluctance machines
  • Position estimation at starting and lower speeds in three-phase switched reluctance machines
  • Position estimation at starting and lower speeds in three-phase switched reluctance machines

Examples

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Embodiment Construction

[0020] Refer to attached picture Figure 1-5 , where these figures are only used to describe certain embodiments of the position estimation method at start-up and low speed in a three-phase switched reluctance machine, and are not intended to be limited to these embodiments. Specific features relating to the embodiments disclosed herein are not to be considered limiting unless the claims expressly state otherwise.

[0021] In certain embodiments, sensorless operation of a three-phase SRM may use one phase for motor drive and one or more other phases for sensing position at different times. In some embodiments, pulse injection may be able to detect the position of the motor at start-up. In some embodiments, pulses are injected into the three phases simultaneously and the phases are compared to identify the motor position. The SRM motor position can be identified by sector. For these three phase SRMs, six different sectors can be defined. Each sector is unique and tells us w...

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PUM

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Abstract

Provided is a method of indirect position estimation in three-phase switched reluctance machines. The method may comprise providing a three-phase switched reluctance machine. A three-phase switched reluctance machine may comprise a rotor and three phases. The method may further comprise producing data about the machine, setting threshold current values for at least a first phase; and sensing rotor position. Sensing rotor position may comprise applying a sensing pulse voltage sufficient to induce a pulse current having some maximum amperage in the first phase, determining the amplitude of the maximum amperage of said pulse current with respect to the thresholds for the first phase, and determining the sector of the rotor based upon the amplitude of the maximum amperage of the pulse current in the first phase.

Description

[0001] This application claims priority to U.S. Ser. No. 61 / 174,388, entitled "Position Estimation at Startup and Low Speed ​​in a Three-Phase Switched Reluctance Motor," filed April 30, 2009, which is hereby incorporated by reference . [0002] This application claims priority to U.S. Serial No. 12 / 614,732, entitled "Position Estimation at Startup and Low Speed ​​in a Three-Phase Switched Reluctance Motor," filed November 9, 2009, which is hereby incorporated by reference . technical field [0003] A detection method of a motor position of a switched reluctance motor (SRM) is provided. More specifically, a detection method of motor position by pulse-injected three-phase SRM is provided. Background technique [0004] SRMs may have three phases, four phases or some other number of phases. In some applications, it may be desirable to detect the motor position in the SRM. In some applications, the commutation angle scheduled in the SRM is a function of the motor position. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P25/08
CPCH02P25/082H02P25/0925
Inventor I·侯赛因G·帕斯克索尼
Owner THE UNIVERSITY OF AKRON