STATOR RESISTANCE ESTIMATION FOR ELECTRIC MOTORS

摘要

A method of controlling an electric motor (motor) includes providing a processor having an associated memory storing a stator resistance (Rs) estimation (RSE) algorithm that is programmed to implement the RSE algorithm to execute steps including injecting a current waveform at an arbitrary frame of reference into the stator using a field-oriented-control (FOC) motor controller including an Id controller and an Iq controller, and measuring current and voltage values from the motor responsive to the injecting. The measured current and voltage values are then transformed into transformed current and voltage values in a d/q coordinate system. The transformed current and voltage values are low pass filtered to generate filtered d/q current and voltage values, and a value for Rs is estimated from the filtered d/q current and voltage values. The arbitrary frame of reference can be a time-varying frame of reference.

主权项

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, andestimating a value for said Rs ({circumflex over (R)}s) from said filtered d/q current and voltage values.