# RrL Estimator

Estimate rotor resistance (*R _{r}*),
magnetizing inductance (

*L*), stator leakage inductance (

_{m}*L*), and rotor leakage inductance (

_{ls}*L*) of AC induction motor (ACIM)

_{lr}*Since R2023a*

**Libraries:**

Motor Control Blockset /
Parameter Estimation /
ACIM Parameter Estimation

## Description

The RrL Estimator block computes the rotor resistance
(*R _{r}*), magnetizing inductance
(

*L*), stator leakage inductance (

_{m}*L*), and rotor leakage inductance (

_{ls}*L*) of an AC induction motor using the phase currents, DC voltage across the motor, and the test configuration elements.

_{lr}To estimate these values, the block injects the following three signals across the motor phases:

First low-frequency signal (of varying voltage)

Second low-frequency signal (of varying voltage)

High-frequency signal (of fixed voltage)

Using the given initial voltage and the step size, the block performs a voltage sweep on
the first and second low-frequency signals until the resulting motor phase current becomes
equal to 50 percent of the motor rated current. At this point, the block measures the phase
difference between the injected voltage (of the low-frequency signals) and the resulting
current response to estimate *R _{r}*,

*L*,

_{m}*L*, and

_{ls}*L*.

_{lr}## Ports

### Input

### Output

## Extended Capabilities

## Version History

**Introduced in R2023a**