Induction motor control systems and methods
First Claim
1. A control system for an inverter assembly associated with an induction motor, the system comprising:
- a current determination module configured to generate q- and d-axis current commands based on a torque command, wherein the current determination module is further configured to generate the q-axis current command based on an observed flux linkage and a flux linkage command;
a motor current control module coupled to the current determination module and configured to generate q- and d-axis voltage commands based on the q- and d-axis current commands generated by the current determination module; and
a PWM modulator coupled to the motor current control module configured to generate duty cycle signals for operating the inverter assembly based on the q- and d-axis voltage commands generated by the motor current control module,wherein the current determination module configured to generate the q-axis current command based on a ratio of the flux linkage command and the observed flux linkage such that transient torque response of the motor is reduced.
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Accused Products
Abstract
A control system is provided for an inverter assembly associated with an induction motor. The system includes a current determination module configured to generate q- and d-axis current commands based on a torque command. The current determination module is further configured to generate the q-axis current command based on an observed flux linkage and a flux linkage command. The system further includes a motor current control module coupled to the current determination module and configured to generate q- and d-axis voltage commands based on the q- and d-axis current commands generated by the current determination module and a PWM modulator coupled to the motor current control module configured to generate duty cycle signals for operating the inverter assembly based on the q- and d-axis voltage commands generated by the motor current control module.
6 Citations
17 Claims
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1. A control system for an inverter assembly associated with an induction motor, the system comprising:
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a current determination module configured to generate q- and d-axis current commands based on a torque command, wherein the current determination module is further configured to generate the q-axis current command based on an observed flux linkage and a flux linkage command; a motor current control module coupled to the current determination module and configured to generate q- and d-axis voltage commands based on the q- and d-axis current commands generated by the current determination module; and a PWM modulator coupled to the motor current control module configured to generate duty cycle signals for operating the inverter assembly based on the q- and d-axis voltage commands generated by the motor current control module, wherein the current determination module configured to generate the q-axis current command based on a ratio of the flux linkage command and the observed flux linkage such that transient torque response of the motor is reduced. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method of controlling an inverter of an induction motor, the method comprising the steps of:
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receiving a torque command; generating a flux linkage command based on the torque command; receiving an observed flux linkage; generating a q-axis current command a based on the flux linkage command and the observed flux linkage; generating a d-axis current command based on the flux linkage command; generating q- and d-axis voltage commands based on the q- and d-axis current command; and generating duty cycle signals for operating the inverter based on the q- and d-axis voltage commands, wherein the generating the q-axis current command step includes generating the q-axis current command based on a scaling factor, and wherein the generating the q-axis current command step includes selecting the scaling factor based on the ratio of the flux linkage command and the observed flux linkage. - View Dependent Claims (12, 13, 14, 15, 16)
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17. A control system for an inverter of an induction motor, the control system comprising:
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a current determination module configured to generate q- and d-axis current commands based on a torque command, wherein the current determination module is further configured to generate the q-axis current command by modifying a calculated q-axis current command with a scaling factor based on the ratio of the flux linkage command to the observed flux linkage, wherein the current determination module is configured to select a first scaling factor if the ratio of the flux linkage command to the observed flux linkage is greater than the first scaling factor, a second scaling factor if the ratio of the flux linkage command to the observed flux linkage is less than the second scaling factor, and a third scaling factor if the ratio if the ratio of the flux linkage command to the observed flux linkage is between the first and second scaling factors; a motor current control module coupled to the current determination module and configured to generate q- and d-axis voltage commands based on the q- and d-axis current commands generated by the current determination module; and a PWM modulator coupled to the motor current control module configured to generate duty cycle signals for operating the inverter based on the q- and d-axis voltage commands generated by the motor current control module.
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Specification