Parameter estimation for a permanent magnet synchronous motor
AssigneeInfineon Technologies Austria AG
InventorHamid Behjati Najafabadi
Life of this patent
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Abstract
A method of parameter estimation for a PMSM (permanent magnet synchronous motor) includes: iteratively revising an estimate of an inductance parameter of the PMSM, until the estimate either converges to a predetermined accuracy level or diverges; and controlling a magnitude of phase currents injected into the PMSM during each iteration of revising the estimate of the inductance parameter. Additional methods of PMSM parameter estimation are described, including rotor flux linkage estimation.
Claims17
A method of parameter estimation for a PMSM (permanent magnet synchronous motor), the method comprising:
- iteratively revising an estimate of an inductance parameter of the PMSM, until the estimate either converges to a predetermined accuracy level or diverges;
- controlling a magnitude of phase currents injected into the PMSM during each iteration of revising the estimate of the inductance parameter;
- during a present iteration of revising the estimate of the inductance parameter:
- estimating an impedance of the PMSM for an immediately preceding iteration of revising the estimate;
- estimating the inductance parameter for the immediately preceding iteration;
- and
- calculating a voltage to be applied to the PMSM during the present iteration.
A method of parameter estimation for a PMSM (permanent magnet synchronous motor), the method comprising:
- estimating an inductance of the PMSM along a first axis aligned with a permanent magnet flux of the PMSM;
- estimating an inductance of the PMSM along a second axis perpendicular to the permanent magnet flux of the PMSM;
- and
- estimating rotor flux linkage of the PMSM based on a magnitude component of a phase-lock-loop (PLL) used to implement rotor-frame-orientation (RFO) field oriented control (FOC) of the PMSM, and a difference between the inductance estimated along the first axis and the inductance estimated along the second axis.
A method of parameter estimation for a PMSM (permanent magnet synchronous motor), the method comprising:
- estimating an inductance of the PMSM along an axis aligned with a permanent magnet flux of the PMSM;
- and
- estimating rotor flux linkage of the PMSM based on a magnitude component of a phase-lock-loop (PLL) used to implement stator-frame-orientation (SFO) field oriented control (FOC) of the PMSM, the inductance estimated along the axis aligned with the permanent magnet flux of the PMSM, and a load angle estimate in SFO.
A computer program product comprising one or more non-transitory computer readable media storing a computer program operable, when executed by a controller, to direct the controller to execute a method of parameter estimation for a PMSM (permanent magnet synchronous motor), the computer program comprising:
- program instructions to iteratively revise an estimate of an inductance parameter of the PMSM, until the estimate either converges to a predetermined accuracy level or diverges;
- and program instructions to control a magnitude of phase currents injected into the PMSM during each iteration of revising the estimate of the inductance parameter;
- during a present iteration of revising the estimate of the inductance parameter:
- estimating an impedance of the PMSM for an immediately preceding iteration of revising the estimate;
- estimating the inductance parameter for the immediately preceding iteration;
- and calculating a voltage to be applied to the PMSM during the present iteration.
A method of parameter estimation for a PMSM (permanent magnet synchronous motor), the method comprising:
- iteratively revising an estimate of an inductance parameter of the PMSM, until the estimate either converges to a predetermined accuracy level or diverges;
- and
- controlling a magnitude of phase currents injected into the PMSM during each iteration of revising the estimate of the inductance parameter,
- wherein the magnitude of phase currents injected into the PMSM during each iteration of revising the estimate of the inductance parameter are controlled so as to converge to a target current magnitude for the PMSM as the estimate of the inductance parameter converges towards the predetermined accuracy level, by adjusting the voltage to be applied to the PMSM during each iteration of revising the estimate of the inductance parameter.
Dependencies are inferred from the claim text.