Controlling torque ripple in interior permanent magnet machines
AssigneeFord Global Technologies, LLC
InventorsFranco Leonardi, Dean Richard Canini, Michael W. Degner
Life of this patent
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Abstract
A system for controlling a vehicle, the vehicle including a permanent magnet (PM) synchronous motor, includes a controller. The controller is configured to control the motor with a motor current. In the presence of a predetermined condition, the motor current results in increased winding loss and reduced torque ripple with respect to optimal motor current for minimal winding loss.
Claims20
A system for controlling a vehicle including a permanent magnet (PM) synchronous motor, the system comprising a controller configured to:
- control the motor with a motor current wherein, in the presence of a predetermined condition, the motor current results in increased winding loss and reduced torque ripple with respect to optimal motor current for minimal winding loss.
A method of controlling a vehicle including a permanent magnet (PM) synchronous motor, the motor being calibrated such that for each torque command, there are corresponding direct axis (d-axis) and quadrature axis (q-axis) current commands, the method comprising:
- establishing a torque command;
- determining d-axis and q-axis current commands Id and Iq, respectively, corresponding to the torque command;
- controlling the motor based on Id, Iq;
- and
- wherein, in the presence of a predetermined condition, Id and Iq result in increased winding loss and reduced torque ripple with respect to optimal Id and Iq for minimal winding loss.
A system for controlling a vehicle including a permanent magnet (PM) synchronous motor, the motor being calibrated such that for each torque command, there are corresponding direct axis (d-axis) and quadrature axis (q-axis) current commands, the system comprising a controller configured to:
- establish a torque command;
- determine d-axis and q-axis current commands Id and Iq, respectively, corresponding to the torque command;
- control the motor based on Id, Iq;
- and
- wherein, in the presence of a predetermined condition, Id and Iq result in increased winding loss and reduced torque ripple with respect to optimal Id and Iq for minimal winding loss.
Dependencies are inferred from the claim text.