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

A system for controlling driving of a brushless direct current electric motor (BLDC) of an electric water pump, comprising:

• a memory configured to store program instructions;
• and
• a processor configured to execute the program instructions, the program instructions when executed configured to:
• estimate an initial position of a rotor based on a magnitude of a current detected in a three-phase coil wound on a stator;
• convert 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 output the converted direct currents;
• acquire a 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
• adjust a speed of the motor based on the acquired rotational angle, speed, flux, and torque of the rotor,
• wherein the program instructions that, when executed, acquire the rotational angle, the speed, the flux and the torque of the rotor are further configured to:
• acquire the speed of the rotor based on a change in the rotational angle of the rotor with respect to the initial position;
• and
• acquire the torque of the rotor based on the rotational angle of the rotor and the speed of the rotor.

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 current magnitude 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 current magnitude generated in the three-phase coil wound on the stator and the current magnitude generated in a magnet of the rotor are converted, by a controller, into output signals of a DC waveform based on the three-phase current.