MUMBAI, India, Sept. 12 -- Intellectual Property India has published a patent application (202544008679 A) filed by Carrier Japan Corporation, Tokyo, on Feb. 3, for 'open-winding motor drive device.'
Inventor(s) include Shibayama Takeshi; Uchiyama Yoshitaka; and Kanamori Masaki.
The application for the patent was published on Sept. 12, under issue no. 37/2025.
According to the abstract released by the Intellectual Property India: "An open-winding motor drive device according to an embodiment includes a primary side inverter having three-phase wires that are independent from each other and are connected to three output terminals of a motor having an open-winding structure including six output terminals, a secondary side inverter connected to three remaining output terminals of the motor, a current detecting unit that detects three-phase currents applied to the motor, a current variation detecting unit that outputs a difference between values of the three-phase currents detected twice as a current variation, a magnetic-pole-position estimating unit that estimates a magnetic pole position based on the current variation of the motor, a control unit that controls current to be applied to the motor and a rotating speed, a zero-phase current suppressing unit that suppresses zero-phase current flowing in the same direction through the three-phase wires of the motor via paths between the primary side and secondary side inverters and the motor, and a PWM signal generating unit that compares three-phase duty ratios calculated based on a command voltage and a direct-current voltage acquired from the control unit and the zero-phase current suppressing unit with a carrier and generates three-phase PWM signals of each of the primary side and secondary side inverters. For 64 voltage vectors, which are combinations of ON/OFF patterns of the primary side and secondary side inverters, the PWM signal generating unit divides a hexagonal spatial vector is divided into six sectors, the hexagonal spatial vector having, as its center, a point where two second switching patterns are located and having, as its vertices, points where two first switching patterns are located, the second switching pattern not generating zero-phase voltage and not generating voltage that acts on between the phases of the motor, the first switching pattern not generating zero-phase voltage and generating voltage that acts on between the phases of the motor, and for three-phase duty ratios of the primary side and secondary side inverters of each sector, and shifts the phases by synchronizing between the primary side and the secondary side such that a time is provided for the current variation detecting unit to detect a difference between current values of the three phases twice for each of a maximum, medium and minimum phases classified based on the magnitudes of the duty ratios."
Disclaimer: Curated by HT Syndication.
