Machine loss modeling for improved field oriented control accuracy
AssigneeBae Systems Information and Electronic System Intergration Inc.
InventorsRobert J. VOVOS, Arthur P. LYONS
Life of this patent
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Abstract
Controllers, method and programs for controlling machines are provided. For example, A method comprises determining a resistance value for a loss compensation resistor, updating at least one control equation based on an equivalent circuit using the resistance value and controlling the machine based on the updated at least one control equation. The resistance value represents a plurality of electro-magnetic losses of a machine. The resistance value can be determined from an inverse resistance value.
Claims19
A method comprising:
- determining a resistance value for a loss compensation resistor, the resistance value representing a plurality of electro-magnetic losses of a machine, the resistance value being determined from an inverse resistance value, where the inverse resistance value is based on a a speed-based offset and/or speed based slope and a slip speed;
- updating at least one control equation based on an equivalent circuit using the resistance value;
- and
- controlling the machine based on the updated at least one control equation.
A controller comprising:
- a storage device configured to store a table of inverse resistance values, the inverse resistance values being based on a speed based slope, a speed based offset and a slip speed;
- and
- a processor configured to determine a resistance value for a loss compensation resistor based on the slip speed and an operating speed using the stored table of inverse resistance values, the resistance value representing a plurality of electro-magnetic losses of an induction machine, update at least one control equation based on at least one equivalent circuit using the resistance value and control the induction machine based on the updated at least one control equation.
A controller comprising:
- a storage device configured to store a table of inverse resistance values, the inverse resistance values being based on a speed based offset;
- and
- a processor configured to determine a resistance value for a loss compensation resistor based on an operating speed using the stored table of inverse resistance values, the resistance value representing a plurality of electro-magnetic losses on a machine, update at least one control equation based on at least one equivalent circuit using the resistance value and control the machine based on the updated at least one control equation.
A computer readable storage device having a program of instructions, which when executed by a processor, causes the processor to execute:
- determining a resistance value for a loss compensation resistor, the resistance value representing a plurality of electro-magnetic losses of a machine, the resistance value being determined from an inverse resistance value, where the inverse resistance value is based on a speed based offset and/or speed based slope and a slip speed;
- updating at least one control equation based on an equivalent circuit using the resistance value;
- and
- controlling the machine based on the updated at least one control equation.
Dependencies are inferred from the claim text.