Position estimation system and method for an electric motor
AssigneeCirrus Logic, Inc.
InventorJohn Laurence Melanson
Life of this patent
Estimating the term…
Abstract
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,
Claims24
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.
A system for estimating a motor position of a motor, comprising:
- a field oriented control algorithm block for observing motor currents of a motor at two different times and determining average motor voltages of the. motor between the two different times;
- a position estimator for calculating average hack 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;
- and
- an analog-to-digital converter (ADC) that is capable of coupling the system to a motor phase of the motor for observing the average motor voltages wherein the ADC 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.
Dependencies are inferred from the claim text.