Infineon Technologies Austria Ag

Hamid Behjati Najafabadi

Benjamin Tang

An apparatus for generating an applicable control signal, including: a control module operable to generate a reference control signal that avoids, but is effectively within, a forbidden region by alternating the reference control signal between upper and lower levels of the forbidden region; an error determination module operable to generate an error signal based on a difference between the reference control signal and the applicable control signal; and a compensation module operable to noise-shape the error signal to suppress a portion of the error signal resulting from avoiding the forbidden region, and to modify the reference control signal based on the noise-shaped error signal, wherein the modified reference control signal is output by the apparatus as the applicable control signal for generating a modulation signal.

Modulation signal generation avoiding forbidden regions

A controller for a permanent magnet synchronous motor includes a first control loop having a first filter. The first filter has a back-EMF voltage vector input, a magnetic flux vector output with a constant phase shift that is independent of motor speed, and an amplitude response that is inversely proportional to rotor electrical frequency. The first control loop is configured to: generate an adjusted magnetic flux vector from the magnetic flux vector output by the first filter and compensate for the constant phase shift introduced by the first filter; estimate the rotor electrical frequency from the adjusted magnetic flux vector; and feedback a filtered version of the rotor electrical frequency estimate to the first filter as an estimation of the rotor electrical frequency.

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Hamid Behjati Najafabadi