METHODS, SYSTEMS AND APPARATUS FOR OVERMODULATION OF A FIVE-PHASE MACHINE
First Claim
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1. A method for overmodulating a reference voltage vector to optimize voltage command signals that control a five-phase inverter module to increase output voltages generated by the five-phase inverter module, the method comprising:
- determining a magnitude and an angle of the reference voltage vector based on the voltage command signals;
determining whether the magnitude of the reference voltage vector is less than or equal to a threshold; and
generating a modified magnitude and a modified angle of the reference voltage vector based on the magnitude of the reference voltage vector and the angle of the reference voltage vector when the magnitude of the reference voltage vector is determined to be less than or equal to a threshold.
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Abstract
Methods, system and apparatus are provided for overmodulation of a five-phase machine in a vector controlled motor drive system that includes a five-phase PWM controlled inverter module that drives the five-phase machine. Techniques for overmodulating a reference voltage vector are provided to optimize voltage command signals that control a five-phase inverter module to increase output voltages generated by the five-phase inverter module.
65 Citations
20 Claims
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1. A method for overmodulating a reference voltage vector to optimize voltage command signals that control a five-phase inverter module to increase output voltages generated by the five-phase inverter module, the method comprising:
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determining a magnitude and an angle of the reference voltage vector based on the voltage command signals; determining whether the magnitude of the reference voltage vector is less than or equal to a threshold; and generating a modified magnitude and a modified angle of the reference voltage vector based on the magnitude of the reference voltage vector and the angle of the reference voltage vector when the magnitude of the reference voltage vector is determined to be less than or equal to a threshold. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A five-phase system, comprising:
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a five-phase inverter module that generates an output voltages based on voltage command signals that control the five-phase inverter module; a five-phase machine driven by the output voltages generated by the five-phase inverter module; and an overmodulation processor designed to overmodulate a reference voltage vector to optimize the voltage command signals to increase the output voltages generated by the five-phase inverter module. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A method for overmodulating a reference voltage vector to optimize voltage command signals that controls a five-phase inverter module to increase output voltages generated by the five-phase inverter module, the method comprising:
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determining a magnitude and an angle of the reference voltage vector based on synchronous reference frame voltage command signals; determining whether the magnitude of the reference voltage vector is less than or equal to a linear region voltage threshold for a linear modulation region to determine whether the reference voltage vector is within the linear modulation region; when the magnitude of the reference voltage vector is determined to be less than or equal to the first voltage threshold for the first overmodulation region and the reference voltage vector is determined to be within the first overmodulation region, generating a modified magnitude of the reference voltage vector based on the magnitude of the reference voltage vector and a correction factor coefficient, and a modified angle of the reference voltage vector that is equal to the angle of the reference voltage vector; when the magnitude of the reference voltage vector is determined to be greater than the linear region voltage threshold for the linear modulation region, determining whether the magnitude of the reference voltage vector is less than or equal to a first voltage threshold for a first overmodulation region to determine whether the reference voltage vector is within the first overmodulation region or a second overmodulation region; and when the magnitude of the reference voltage vector is determined to be greater than the first voltage threshold for the first overmodulation region and the reference voltage vector is determined to be within the second overmodulation region, generating a modified magnitude of the reference voltage vector, and a modified angle of the reference voltage vector that is different than the angle of the reference voltage vector. - View Dependent Claims (20)
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Specification