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.
4 Assignments
0 Petitions
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.
19 Citations
20 Claims
-
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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
-
-
12. A method of controlling an inverter of an induction motor, the method comprising the steps of:
-
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. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19)
-
-
20. A control system for an inverter of an induction motor, the control 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 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.
-
Specification