A.C. Motor control circuit

A microprocessor based A.C. motor control circuit which can be used for both open and closed loop control includes a pair of RAMs for storing separate groups of synchronized digital waveforms for driving an A.C. motor. The microprocessor is used to calculate the group of digital waveforms required to maintain a controlled motor parameter at a desired value. One RAM has an output connected to supply the group of digital waveforms stored therein to a motor driver, while the second RAM is connected to receive a new group of digital waveforms which have just been calculated by the microprocessor. Once the new group of waveforms have been loaded into the second RAM, the microprocessor generates control signals to disconnect the output of the first RAM from the motor driver, and to connect the output of the second RAM to supply the newly calculated digital waveforms to the motor driver. The first RAM is then connected to receive the next group of digital waveforms to be calculated by the microprocessor.
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Abstract/Description: A microprocessor based A.C. motor control circuit which can be used for both open and closed loop control includes a pair of RAMs for storing separate groups of synchronized digital waveforms for driving an A.C. motor. The microprocessor is used to calculate the group of digital waveforms required to maintain a controlled motor parameter at a desired value. One RAM has an output connected to supply the group of digital waveforms stored therein to a motor driver, while the second RAM is connected to receive a new group of digital waveforms which have just been calculated by the microprocessor. Once the new group of waveforms have been loaded into the second RAM, the microprocessor generates control signals to disconnect the output of the first RAM from the motor driver, and to connect the output of the second RAM to supply the newly calculated digital waveforms to the motor driver. The first RAM is then connected to receive the next group of digital waveforms to be calculated by the microprocessor.
Subject(s): 318/811
363/41
363/98
363/132
Date Issued: 1982-06-29
Title: A.C. Motor control circuit.
Name(s): The University of Toledo, assignee
Stuart, Thomas A., inventor
Type of Resource: text
Genre: patent
Publisher: United States Patent and Trademark Office
Other Date: Date Filed: 1980-09-04
Date Issued: 1982-06-29
Physical Form: application/pdf
Extent: 8 p.
Abstract/Description: A microprocessor based A.C. motor control circuit which can be used for both open and closed loop control includes a pair of RAMs for storing separate groups of synchronized digital waveforms for driving an A.C. motor. The microprocessor is used to calculate the group of digital waveforms required to maintain a controlled motor parameter at a desired value. One RAM has an output connected to supply the group of digital waveforms stored therein to a motor driver, while the second RAM is connected to receive a new group of digital waveforms which have just been calculated by the microprocessor. Once the new group of waveforms have been loaded into the second RAM, the microprocessor generates control signals to disconnect the output of the first RAM from the motor driver, and to connect the output of the second RAM to supply the newly calculated digital waveforms to the motor driver. The first RAM is then connected to receive the next group of digital waveforms to be calculated by the microprocessor.
Identifier(s): utpatents-US4337429 (IID)
Patent No.: US4337429 (patno)
Appl. No.: 06/184107 (appno)
Subject(s): 318/811
363/41
363/98
363/132
Held by: United States Patent and Trademark Office (USPTO) Public Search Facility
Location: University of Toledo Digital Repository
Rights Statement: No Copyright - United States
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