Rotor position sensing system for three phase motors and related methods

A method for sensing rotor position, the method comprising:

• coupling a controller and one of a timer and an analog-to-digital converter (ADC) with a three phase permanent magnet synchronous motor (PMSM);
• applying, using the controller coupled with the PMSM, a plurality of current vectors to the PMSM, the plurality of current vectors comprising a plurality of dummy current vectors and a plurality of measured current vectors, wherein at least one measured current vector is applied quadrature to a dummy current vector from the plurality of dummy current vectors preceding each measured current vector;
• measuring, with the one of the timer and the ADC, a plurality of values from a three-phase inverter coupled with the PMSM, each value of the plurality of values corresponding with one of the plurality of measured current vectors and comprising one of a current value corresponding with an inductance of the PMSM and a time value corresponding with an inductance of the PMSM, and;
• calculating, with one or more logic elements coupled with the PMSM, based on the plurality of values and using one or more position algorithms, a position of a rotor of the PMSM relative to a stator of the PMSM;
• wherein the one or more logic elements are configured to calculate the position of the rotor when the rotor is in a stopped configuration and when the rotor is in a rotating configuration, and;
• wherein the one or more logic elements are configured to calculate a position of a rotor of a PMSM that is not controlled using vector control.