ACIM Rs Estimator
Libraries:
Motor Control Blockset /
Parameter Estimation /
ACIM Parameter Estimation
Description
The ACIM Rs Estimator block computes the stator resistance of an induction motor using the phase currents, DC voltage across the motor, and the test configuration elements.
The block injects a voltage across the motor phases and measures the current response to estimate the motor resistance.
Examples
Estimate Induction Motor Parameters Using Parameter Estimation Blocks
Uses the parameter estimation blocks provided by Motor Control Blockset™ to estimate these parameters of an AC induction motor (ACIM):
Ports
Input
Iabc — Three-phase current response
scalar
The three-phase current response of the motor measured by the current sensors.
Note
Providing phase-c current input is optional. The block functionality is not impacted if you do not provide the phase-c current input.
Data Types: single
Vdc — DC link voltage
scalar
DC bus voltage that you provide to the inverter.
Data Types: single
StartStop — Control signal for Rs estimation
logical
Signal that either starts or stops Rs estimation:
1
(rising edge of a pulse) — This signal initiates the Rs estimation process.0
(falling edge of a pulse) — This signal immediately stops the Rs estimation process. If you interrupt the estimation process abruptly before completion, the block does not compute or output the Rs value.
Data Types: Boolean
Config — Bus signal input
bus
This table summarizes the expected configuration elements in the bus signal input.
Category | Configuration element | Units | ||
---|---|---|---|---|
Elements for motor and inverter hardware | Number of pole pairs | - | ||
Rated frequency | Hz | |||
Nominal motor current | A | |||
Nominal voltage | V | |||
Maximum measurable inverter current | A | |||
Board resistance | ohm | |||
Current sense gain | A/ADC Count | |||
Voltage sense gain | V/ADC Count | |||
Elements for estimating magnetizing current Id0 | Measurement time | seconds | ||
Open-loop ramp time | seconds | |||
Elements for estimating motor resistance (Rs) | Estimation time | seconds | ||
Vd reference voltage 1 | PU voltage | |||
Vd reference voltage 2 | PU voltage | |||
Elements for estimating rotor resistance (Rr), magnetizing inductance (Lm), stator leakage inductance (Lls), and rotor leakage inductance (Llr) | Frequency 1 as a ratio of rated frequency | PU frequency | ||
Frequency 2 as a ratio of rated frequency | PU frequency | |||
High frequency for Lm | Hz | |||
Start voltage for voltage sweep | PU voltage | |||
Voltage step for voltage sweep | PU voltage | |||
High-frequency injection voltage | PU voltage | |||
Elements for estimating motor inertia (J) and friction constant (B) | Closed-loop speed duration | seconds | ||
Closed-loop speed | RPM | |||
Iq Reference current for FOC | PU current | |||
Proportional gain | - | |||
Integral gain | - | |||
Lower speed limit for inertia estimation | RPM | |||
- | Parameter estimation sample time | seconds |
You can connect this input port to the Config
output port of
the ACIM Parameter Estimation Configurator block.
Data Types: single
Output
Vabc — a, b, and c-axis stator
reference voltage components
scalar
Stator reference voltage components along the a, b, and c axes of the abc reference frame.
Data Types: single
Rs — Estimated stator resistance
scalar
Estimated stator resistance (in ohms) of the induction motor.
Data Types: single
Log — Debug signals
bus
Debug signals that the block provides for examination. The bus includes these debug signals.
Debug signal | Description | Units | ||
---|---|---|---|---|
Id | D-axis current | Amperes | ||
Vd | D-axis voltage | Volts | ||
status | 0 | Did not complete Rs estimation | - | |
1 | Rs estimation completed successfully | - |
Data Types: single
Extended Capabilities
C/C++ Code Generation
Generate C and C++ code using Simulink® Coder™.
Version History
Introduced in R2023a
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