Motor control system and method with predictive motor current estimation

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United States of America Patent

PATENT NO 9923497
SERIAL NO

15088096

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ATTORNEY / AGENT: (SPONSORED)

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Abstract

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A chiller system includes a compressor configured to circulate a refrigerant between an evaporator and a condenser in a closed refrigerant loop and a synchronous motor configured to drive the compressor. The motor includes a stator winding and a rotor. The chiller system includes a controller configured to estimate a flux linkage of the rotor and generate a control signal for the motor based on the estimated flux linkage. Estimating the flux linkage includes applying a voltage of the stator winding to a transfer function having an error correction variable, using a first value of the error correction variable in the transfer function to obtain convergence of the flux linkage over an initial motor starting interval, and using a second value of the error correction variable after the initial motor starting interval to reduce an error in estimating the flux linkage.

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Patent Owner(s)

Patent OwnerAddress
JOHNSON CONTROLS TECHNOLOGY COMPANY5757 NORTH GREEN BAY AVENUE MILWAUKEE WI 53209

International Classification(s)

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Jadric, Ivan York, US 38 550
Wu, Zhiqiao York, US 13 44

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