US 9,813,005 B2
Stator resistance estimation for electric motors
David Patrick Magee, Allen, TX (US); Andre Veltman, Culemborg (NL); and Jorge Zambada, San Diego, CA (US)
Assigned to TEXAS INSTRUMENTS INCORPORATED, Dallas, TX (US)
Filed by TEXAS INSTRUMENTS INCORPORATED, Dallas, TX (US)
Filed on Jul. 1, 2016, as Appl. No. 15/200,294.
Application 15/200,294 is a continuation of application No. 14/486,303, filed on Sep. 15, 2014, granted, now 9,413,282.
Claims priority of provisional application 61/886,331, filed on Oct. 3, 2013.
Prior Publication US 2016/0315572 A1, Oct. 27, 2016
Int. Cl. H02P 21/14 (2016.01); H02P 21/24 (2016.01)
CPC H02P 21/14 (2013.01) [H02P 21/24 (2016.02)] 7 Claims
OG exemplary drawing
 
1. A method of controlling an electric motor (motor), including a rotor and a stator, comprising:
providing a processor having an associated memory storing a stator resistance (Rs) estimation (RSE) algorithm, said processor programmed to implement said RSE algorithm to execute:
injecting a current waveform at an arbitrary frame of reference into said stator using a field-oriented-control motor controller (FOC controller) including an Id controller for controlling direct (d) current and an Iq controller for controlling quadrature (q) current;
measuring current and voltage values from said motor responsive to said injecting;
transforming said measured current and voltage values into transformed current and voltage values in d/q coordinate system;
low pass filtering said transformed current and voltage values to generate filtered d/q current and voltage values, and
estimating a value for said Rs (Rs) from said filtered d/q current and voltage values.