Mitsubishi Electric Corporation Files Patent Application for Control Device for Rotating Machine

Strategic Insights -

Mitsubishi Electric Corporation, a leading technology company, has recently filed a patent application for a control device for rotating machines. According to the patent, the control device aims to improve the responsiveness and accuracy of rotor position estimation while preventing interference between flux linkage computation and position estimate computation. The control device includes a current detector, a position estimator, a control unit, and a voltage application unit. The position estimator updates computed flux linkages based on stator voltage command values, rotational speed estimates, and the most recent computed flux linkages.

Key Takeaways:

  • The control device for rotating machines aims to improve rotor position estimation while preventing interference between flux linkage computation and position estimate computation.
  • The control device includes a current detector, a position estimator, a control unit, and a voltage application unit.
  • The position estimator updates computed flux linkages based on stator voltage command values, rotational speed estimates, and the most recent computed flux linkages.
  • The control device prevents interference between flux linkage computation and position estimate computation, achieving high responsiveness and accuracy in rotor position estimation.
  • The control device is applicable to various types of rotating machines, including those with variable inductance components that vary with rotor position.
  • The invention includes a number of claims, including claims 1-9, which describe the control device and its operation.

Statistics:

  • The patent application was filed on June 7, 2022, and published on October 2, 2025.
  • The control device is designed to improve the responsiveness and accuracy of rotor position estimation in rotating machines.
  • The control device prevents interference between flux linkage computation and position estimate computation, achieving high responsiveness and accuracy in rotor position estimation.
  • The control device is applicable to various types of rotating machines, including those with variable inductance components that vary with rotor position.
  • The invention includes a control device with a position estimator that updates computed flux linkages based on stator voltage command values, rotational speed estimates, and the most recent computed flux linkages.

Sources:

  • KOJIMA, Tetsuya. Control Device For Rotating Machine. U.S. Patent Application Number 20250309803, filed June 7, 2022 and posted October 2, 2025.
  • Patent URL (for desktop use only): https://ppubs.uspto.gov/pubwebapp/external.html?q=(20250309803)&db=US-PGPUB&type=ids