Position estimation system and method for an electric motor

摘要

Systems and methods of estimating a motor position of a motor are disclosed. One exemplary system and method involve observing motor currents of the motor at two different times. Average motor voltages of the motor are determined between the two different times. Average back electro motive force (BEMF) values of the motor are calculated between the two different times. The BEMF values are in conformity with the observed motor currents and the average motor voltages. Another exemplary system and method for estimating a rotor position of a motor involve a motor position estimator that receives information from the motor and estimates a rotor position for a future time. The future time corresponds approximately to a desired target current,

主权项

1. A method of estimating a motor position of a motor, comprising:
observing motor currents of a motor at two different times; determining average motor voltages of the motor between the two different times; observing the average motor voltages with an analog-to-digital converter (ADC) that takes at least two samples for one voltage phase of a motor voltage signal during a period between the two different times for the one of the average motor voltages; and calculating average back electro motive force (BEMF) values of the motor between the two different times wherein the BEMF values are in conformity with the observed motor currents and the average motor voltages.