Method and system for pulse position scheduling in electric drives
AssigneeGM Global Technology Operations LLC
InventorsBrian A. Welchko, Steven E. Schulz, Silva Hiti
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Abstract
Method and system are provided for controlling an alternating current (AC) motor via an inverter. The method includes selecting a pulse sequencing method based on a modulation index of the inverter, and providing a voltage to the AC motor based on the pulse sequencing method. The system includes an inverter having a modulation index (Mi) and a controller coupled to the inverter. The controller selects a pulse sequencing method based on Mi and produces a signal based on the pulse sequencing method. The inverter includes a switch network producing a voltage in response to the signal, and the voltage drives the AC motor.
Claims20
A method for controlling an alternating current (AC) motor via an inverter, comprising:
- selecting a pulse sequencing method based on a modulation index (Mi) of the inverter;
- and
- providing a voltage to the AC motor based on the pulse sequencing method.
A system for controlling an AC motor, the system comprising:
- an inverter configured to couple to the AC motor, the inverter having a modulation index (Mi) and comprising a switch network configured to provide a voltage to the AC motor in response to a signal, the voltage driving the AC motor;
- and
- a controller coupled to the inverter, the controller configured to select a pulse sequencing method based on the modulation index (Mi) and further configured to produce the signal based on the pulse sequencing method.
A voltage source inverter system for controlling an AC motor, the voltage source inverter system configured to operate with a modulation index (Mi), the voltage source inverter system comprising:
- a switch network comprising first, second, and third pairs of switches, wherein the first, second and third pairs of switches are coupled in parallel to one another and configured to couple in parallel with respect to a power source, the switch network configured to produce a voltage in response to a signal, the voltage driving the AC motor;
- and
- a controller coupled to the switch network, the controller configured to select a pulse sequencing method based on the modulation index (Mi) and further configured to produce the signal based on the pulse sequencing method, and wherein the pulse sequencing method results in no more than one switch of the first, second, and third pairs of switches being closed at an instant.
Dependencies are inferred from the claim text.