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Brushless direct current electric motor driving control method and system of electrical water pump

  • US 10,447,188 B2
  • Filed: 12/08/2017
  • Issued: 10/15/2019
  • Est. Priority Date: 12/14/2016
  • Status: Active Grant
First Claim
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1. A method for controlling driving of a brushless direct current electric motor (BLDC) of an electric water pump, comprising the steps of:

  • estimating, by a controller, an initial position of a rotor based on a magnitude of a current detected in a three-phase coil wound on a stator;

    converting, by the controller, a current magnitude that reflects a rotational angle of the rotor with respect to the initial position into two direct currents based on a three-phase current, and outputting the converted direct currents;

    acquiring, by the controller, the rotational angle, a speed, a flux and a torque of the rotor based on values of the three-phase current, a voltage generated based on flow of the three-phase current, a predetermined coil resistance, and an inductance input; and

    adjusting, by the controller, a speed of the motor based on the acquired rotational angle, speed, flux, and torque of the rotor,wherein the acquiring step further comprises;

    acquiring, by the controller, the speed of the rotor based on a change in the rotational angle of the rotor with respect to the initial position; and

    acquiring, by the controller, the torque of the rotor based on the rotational angle of the rotor and the speed of the rotor.

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