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System and method for controlling a rotating electromagnetic machine

An electromagnetic motor, torque technology, applied in the smooth torque control of such motors, in the field of self-adaptation, can solve problems such as increasing the complexity and cost of the motor

Inactive Publication Date: 2005-09-14
EMERSON ELECTRIC CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Also, existing solutions to torque ripple typically ignore the effect of motor sensitivity (inaccuracy in diagonal measurement)
In order to increase the accuracy in position measurement, attempts have been made to use complex position sensors, but this increases the complexity and cost of the motor

Method used

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  • System and method for controlling a rotating electromagnetic machine

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Embodiment Construction

[0020] Exemplary embodiments of the present invention are described below. In the interest of clarity, not all functions of an actual implementation are described in this specification. It should of course be understood that in the development of any such actual embodiment a number of implementation-specific decisions must be made to accomplish the developer's specific goals, such as compliance with system-related and business-related constraints, which vary from implementation to implementation . Moreover, it will be appreciated that such a development effort might be complex and time-consuming, but would still be a routine undertaking for those of ordinary skill in the art having the benefit of this disclosure.

[0021] Turning now to the drawings, and in particular to FIG. 1 , there is shown a system 10 constructed in accordance with certain teachings of the present disclosure. Therein, the illustrated system 10 actively controls power supplied to an electromagnetic motor...

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Abstract

A system and method for controlling a rotating electromagnetic machine. The rotating machine, such as a permanent magnet motor or switched reluctance motor, includes a stator having a plurality of phase windings and a rotor that rotates relative to the stator. A drive is connected to the phase windings for energizing the windings. The control system includes an estimator connectable to the machine for receiving signals representing the phase winding voltage and rotor position. The estimator outputs parameter estimations for an electrical model of the machine based on the received voltage and rotor position. A torque model receives the parameter estimations from the estimator to estimate torque for associated rotor position-phase current combinations of the machine. A controller outputs a control signal to the drive in response to a torque demand and rotor position signals and the torque model. In certain embodiments, a solver uses the torque model to generate energization current profiles according to desired machine behavior, such as smooth torque and / or minimal sensitivity to errors in rotor position measurement.

Description

technical field [0001] The present invention relates generally to the control of electromagnetic rotating machines, such as permanent magnet machines, switched reluctance machines, and hybrid machines, and more particularly to adaptive, smooth torque control of such machines. Background technique [0002] In general, many electromagnetic motors, especially those employing permanent magnets, exhibit torque irregularities as the rotor rotates relative to the stator (whose coils are typically energized with sinusoidal waves). This irregularity is called "torque ripple". These torque irregularities may be caused by the physical construction of a given electric machine. For example, using bearings to support a rotor can cause torque irregularities. Furthermore, due to the electromagnetic properties of electric machines employing magnets, the rotor tends to be at a certain angular position relative to the stator. The torque irregularity caused by the electromagnetic characteris...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P6/10H02P21/14H02P23/14
CPCH02P23/14H02P21/148H02P6/10H02P21/20
Inventor M·I·亨德森J·G·马尔钦凯维奇
Owner EMERSON ELECTRIC CO
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