• Patent Title: Initial position detection of an electric motor
  • Application No.: US17445343
    Application Date: 2021-08-18
  • Publication No.: US11606053B2
    Publication Date: 2023-03-14
  • Inventor: Jianqiu HuHuabiao Tang
  • Applicant: NXP USA, Inc.
  • Applicant Address: US TX Austin
  • Assignee: NXP USA, Inc.
  • Current Assignee: NXP USA, Inc.
  • Current Assignee Address: US TX Austin
  • Priority: CN202010842508.1 20200820
  • Main IPC: H02P21/18
  • IPC: H02P21/18
Initial position detection of an electric motor
Abstract:
A method for initial position detection of an electric motor includes determining a delta voltage for each of three pairs of stator windings by sequentially energizing and deenergizing each pair. The delta voltage is measured through a non-energized stator winding connected to a center tap of each respective pair. A minimum delta voltage is determined from an absolute value of a minimum of the three delta voltages. The minimum delta voltage is associated with a remaining stator winding not included in the respective pair. The two delta voltages not associated with the minimum delta voltage are compared to determine the proximity of the remaining stator winding to one of a D-axis of a rotor of the electric motor and a Q-axis of the rotor.
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