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
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this course of action can be mechanically difficult in many cases,...

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  • 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

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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...

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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

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Application Information

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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
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