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SYSTEMS AND METHODS FOR LINE START PERMANENT MAGNET MACHINE SYNCHRONIZATION

IP.com Disclosure Number: IPCOM000244241D
Publication Date: 2015-Nov-25
Document File: 13 page(s) / 3M

Publishing Venue

The IP.com Prior Art Database

Related People

Mike Melfi: AUTHOR [+3]

Abstract

In accordance with this disclosure systems and methods for enhancing line start permanentmagnet machine synchronization are provided In one aspect a rotor for a line startpermanent magnet machine is provided in which one or more permanent magnets arepositioned within the rotor a plurality of cage bars are arranged along a longitudinaldimension of the rotor and a first end ring member is connected to a first end of each of theplurality of cage bars The first end ring member can be discontinuously connected to theplurality of rods however such that a flow of currents through the plurality of cage bars iscontrolled to enhance line start permanent magnet synchronization Although an aspect of the subject matter disclosed herein has been stated hereinabove andwhich is achieved in whole or in part by the presently disclosed subject matter other aspectswill become evident as the description proceeds when taken in connection with theaccompanying drawings as best described herein below PERMANENT MAGNETS LINE START DIRECT ON LINE SYNCHRONIZATION

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Page 01 of 13

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SYSTEMS AND METHODS FOR LINE START PERMANENT MAGNET MACHINE SYNCHRONIZATION

Mike Melfi, Rich Schiferl, Wen Ouyang all of ABB Ltd USA

TECHNICAL FIELD

The subject matter disclosed herein relates generally to rotor configurations for permanent magnet machines. More particularly, the subject matter disclosed herein relates to line start permanent magnet machines.

BACKGROUND OF THE DISCLOSURE AND TECHNICAL PROBLEM TO BE SOLVED

Line start permanent magnet machines combine the benefits of induction machines and permanent magnet machines to help diminish the disadvantages of each. In particular, by incorporating both a rotor cage and permanent magnets on the rotor, the machine can operate like an induction motor during start-up, but the steady state characteristics can be very similar to permanent magnet machines with high efficiency and power factor since the rotor conduction loss is virtually eliminated.

Despite these advantages of the combined design, however, transient starting behavior and synchronization capability can be detrimentally impacted by the interaction of the cage flux and permanent magnet flux. As a result, it would be advantageous for line start permanent magnet machines to more effectively integrate the benefits of induction machines and permanent magnet machines without the problems in starting and synchronization.

SUMMARY

In accordance with this disclosure, systems and methods for enhancing line start permanent magnet machine synchronization are provided. In one aspect, a rotor for a line start permanent magnet machine is provided in which one or more permanent magnets are positioned within the rotor, a plurality of cage bars are arranged along a longitudinal dimension of the rotor, and a first end ring member is connected to a first end of each of the plurality of cage bars. The first end ring member can be discontinuously connected to the plurality of rods, however, such that a flow of currents through the plurality of cage bars is controlled to enhance line start permanent magnet synchronization.

Although an aspect of the subject matter disclosed herein has been stated hereinabove, and which is achieved in whole or in part by the presently disclosed subject matter, other aspects will become evident as the description proceeds when taken in connection with the accompanying drawings as best described herein below.

PERMANENT MAGNETS, LINE START, DIRECT ON LINE, SYNCHRONIZATION

© Copyright 2015 ABB

2015-11-02


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DETAILED DESCRIPTION OF EMBODIMENTS

The present subject matter provides an improved line start permanent magnet (LSPM) rotor configuration, which can enhance synchronization without giving up the benefits of integrating an induction machine and a permanent magnet machine. As shown in Figure 1a, conventional line start permanent magnet machines can be unsuccessful in reaching a steady-state during a starting process, which can in some cases be attributed to the interaction of the cage flux and...