Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Method of starting a synchronous motor with a brushless DC exciter

A synchronous motor, DC excitation technology, applied in the direction of AC motor control, motor control, motor generator control, etc., can solve problems such as mechanical difficulties

Active Publication Date: 2010-03-31
SIEMENS AG
View PDF2 Cites 8 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this course of action can be mechanically difficult in many cases, as it requires the replacement of a part in a location that is often inaccessible

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method of starting a synchronous motor with a brushless DC exciter
  • Method of starting a synchronous motor with a brushless DC exciter
  • Method of starting a synchronous motor with a brushless DC exciter

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0015] Before the present method is described, it is to be understood that this invention is not limited to particular systems, methods or protocols described, as such may vary. It should also be understood that the terminology employed herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of the present disclosure.

[0016] As used herein and in the appended claims, the singular forms "a", "an" and "the" include plural references unless the context clearly dictates otherwise. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art. As used herein, the term "comprising" means "including, but not limited to".

[0017] figure 1 An exemplary configuration of a variable frequency drive (VFD (variable frequency drive)) 100 , a brushless direct current (DC) exciter 120 and a synchronous motor 110 is shown. Such as figure 1 As show...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

A starting method and system for a motor where the motor may be started as an induction motor by applying a magnetizing current to build flux through the stator, with the field current set at the maximum permissible exciter stator current (i.e., the current that will cause rated no-load current in the main field at the transition speed). The motor stator currents will be maintained at a value that allows the motor to generate sufficient breakaway torque to overcome any stiction. At a specific transition speed or after a period of time, the drive will initiate a transition from induction motor control to synchronous motor control by removing the initial magnetizing current, and a field current is then applied to the motor through the DC exciter. Once this transition is completed, the drive may ramp up to the desired speed demand.

Description

[0001] Cross References to Related Applications [0001] This application claims the benefit of priority to US Provisional Patent Application No. 60 / 913,128, filed April 20,2007. Background technique [0002] Many synchronous motors, such as motors designed to be started with thyristor soft starters, have or employ brushless direct current (DC) exciters. Using an exciter helps overcome the inertia associated with accelerating the rotor from rest to full speed. [0003] In various situations, it is desirable to operate a synchronous motor with a brushless DC exciter with a medium voltage, variable frequency drive (VFD) motor controller, such as in U.S. Patent No. .5,625,545 as described. A medium voltage VFD motor controller provides the initial current required to start a synchronous motor with a brushless DC exciter while avoiding voltage drops in the utility supply voltage. However, in order to operate without a speed sensor, a synchronous motor with a brushless DC excite...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): H02P1/50H02P25/02
CPCH02P25/026H02P2207/05H02P1/50H02P9/302H02P21/00H02P25/03H02P2201/13
Inventor R·H·奥斯曼K·帕特尔M·拉斯托吉
Owner SIEMENS AG
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com