Method and apparatus for operating a dual rotor electrical machine
AssigneeDeere & Company
InventorsMatthias Lang, Chris J. Tremel, Christopher Reek
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Abstract
There is provided a system including a dual rotor electrical machine. The dual rotor electrical machine comprises a stator, an inner rotor including a first number of permanent magnet pole pairs, and a modulator including a second number of modulating segments. The system includes a controller configured to execute non-transitory machine readable instructions that, when executed by the controller, cause the system to determine a virtual position of an electromagnetic field of the stator based on a weighted sum of an angular position of the inner rotor and an angular position of the modulator, wherein weights in the weighted sum are based on the first number and the second number.
Claims20
A system comprising:
- a dual rotor electrical machine including,
- a stator,
- an inner rotor including a first number of permanent magnet pole pairs,
- a modulator including a second number of modulating segments, and
- a first shaft connected to the modulator, the first shaft having a first shaft angular position;
- and
- a controller configured to execute non-transitory machine readable instructions that, when executed by the controller, cause the system to determine a virtual position of an electromagnetic field of the stator based on the first shaft angular position, a first gear ration, and a weighted sum of an angular position of the inner rotor and an angular position of the modulator, wherein
- weights in the weighted sum are based on the first number and the second number, and
- the first gear ratio is a ratio of a number of gears on the first shaft to a number of gears on the modulator.
A system comprising:
- a dual rotor electrical machine including,
- a stator,
- an inner rotor including a first number of permanent magnet pole pairs, and
- a modulator including a second number of modulating segments;
- and
- a controller configured to execute non-transitory machine readable instructions that, when executed by the controller, cause the system to determine a virtual position of an electromagnetic field of the stator based on a weighted sum of an angular position of the inner rotor and an angular position of the modulator, wherein weights in the weighted sum are based on the first number and the second number, wherein
- the controller is configured to execute machine readable instructions to determine the virtual position as,
- Theta_Stator=−(n1/(n3−n1))*Theta_Rotor+((n1/(n3−n1))+1)*Theta_Modulator+C_3,
- where Theta_Stator is the virtual position, Theta_Rotor is the angular position of the inner rotor, Theta_Modulator is the angular position of the modulator, n1 is the first number of permanent magnet pole pairs, n3 is the second number of modulating segments, and C_3 is a position offset.
A method for operating a dual rotor electrical machine, the dual rotor electrical machine including a stator, an inner rotor including a first number of permanent magnet pole pairs, a modulator including a second number of modulating segments and corresponding modulating rings, and a first shaft connected to the modulator, the method comprising:
- obtaining a first angular position of the inner rotor;
- obtaining a second angular position of the modulator;
- obtaining a first shaft angular position of the first shaft;
- and
- determining a virtual position of an electromagnetic field of the stator, the virtual position based on the first shaft angular position, a first gear ratio, and a weighted sum of the first angular position and the second angular position, wherein
- weights in the weighted sum are based on the first number and the second number, and
- the first gear ratio is a ratio of a number of gears on the first shaft to a number of gears on the modulator.
A non-transitory computer readable medium, when executed by a controller in a system including a dual rotor electrical machine having a stator, an inner rotor including a first number of permanent magnet pole pairs, a modulator including a second number of modulating segments and corresponding modulating rings, and a first shaft connected to the modulator, is configured to cause the system to
- obtain a first angular position of the inner rotor;
- obtain a second angular position of the modulator;
- obtain a first shaft angular position of the first shaft;
- and
- determine a virtual position of an electromagnetic field of the stator, the virtual position based on the first shaft angular position, a first gear ratio, and weighted sum of the first angular position and the second angular position, wherein
- weights in the weighted sum are based on the first number and the second number, and
- the first gear ratio is a ratio of a number of gears on the first shaft to a number of gears on the modulator.
Dependencies are inferred from the claim text.