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Motor speed estimation system and method using hybrid model reference adaptive system

a technology of adaptive system and motor speed, which is applied in the direction of electric controllers, instruments, ignition automatic control, etc., can solve the problems of increasing the cost of the motor drive system, requiring maintenance, and difficulty in coordinating the motor startup with other equipment in various automated systems, and achieves less sensitive effects

Active Publication Date: 2007-09-20
ROCKWELL AUTOMATION TECH
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  • Application Information

AI Technical Summary

Problems solved by technology

However, such external sensors add cost to the motor drive system, and require maintenance.
However, actual motor startup times using these systems often varies with line voltage and motor load, which makes it difficult to coordinate motor startup with other equipment in various automated systems.
Model-based approaches in particular suffer from variance in motor parameters and weak signals during motor startup.
Stator-current-harmonics-based approaches require complex signal processing and the measured harmonics are related to the rotor structure, whereby the speed estimate cannot be updated quickly.

Method used

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  • Motor speed estimation system and method using hybrid model reference adaptive system
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  • Motor speed estimation system and method using hybrid model reference adaptive system

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Embodiment Construction

[0018]Referring now to the figures, several embodiments or implementations of the present invention are hereinafter described in conjunction with the drawings, wherein like reference numerals are used to refer to like elements throughout, the invention is hereinafter illustrated and described in the context of startup control for a three-phase induction motor, although the invention is not limited to the illustrated examples and can be employed in controlling AC motors of any number of phases. The embodiments illustrated below employ closed-loop control of motor speed during startup, in which an error value used by a regulating controller is obtained using a torque-based MRAS component for a first range of speeds, and then the error is obtained for a second speed rage using a rotor flux-based MRAS component, thereby providing hybrid MRAS speed estimation and control. The inventors have found that the hybrid MRAS approach can be easily implemented in existing motor control apparatus,...

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Abstract

Motor drives, motor speed controllers, motor speed estimation systems, and methods are presented for controlling motor speed and for estimating motor speed, in which a speed estimate controller provides a rotor speed estimate based on a first error term from a torque-based MRAS component for a first range of motor speeds and based on a second error term from a rotor flux-based MRAS component for a second range of speeds.

Description

REFERENCE TO RELATED APPLICATION[0001]This application is a continuation of, and claims priority to and the benefit of, co-pending U.S. patent application Ser. No. 11 / 375,800, filed Mar. 14, 2006, entitled SYSTEM AND METHOD FOR MOTOR SPEED ESTIMATION USING HYBRID MODEL REFERENCE ADAPTIVE SYSTEM, the entirety of which is hereby incorporated by reference.FIELD OF THE INVENTION[0002]The present invention relates generally to electric induction motors and more particularly to estimating motor speed using hybrid model reference adaptive systems.BACKGROUND OF THE INVENTION[0003]Motor control systems are widely used to control various aspects of motor performance in a broad spectrum of applications in which electric motors drive loads. Induction motors are asynchronous AC motors having a stator with stator windings providing a rotating AC stator field, with a rotor attached to the motor shaft to rotate within the stator field. Induction motors generally include a so-called squirrel cage ro...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): H02P27/04
CPCH02P21/0053H02P21/146Y10S388/906Y10S388/917H02P2207/01H02P21/0017H02P21/141H02P2203/05H02P2203/09H02P21/0021H02P31/00H02P21/34H02P21/32H02P21/26H02P21/18H02P21/20
Inventor LU, HAIHUIQIAN, WEI
Owner ROCKWELL AUTOMATION TECH
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