ACIM Parameter Estimation Configurator
Generate configuration elements for AC induction motor (ACIM) parameter estimation
Since R2023a
Libraries:
Motor Control Blockset /
Parameter Estimation /
ACIM Parameter Estimation
Description
The ACIM Parameter Estimation Configurator block generates the following configuration elements for estimating the parameters of an AC induction motor:
Elements for motor and inverter hardware
Elements for estimating magnetizing current Id0
Elements for estimating motor resistance (Rs)
Elements for estimating:
Rotor resistance, Rr
Magnetizing inductance, Lm
Stator leakage inductance, Lls
Rotor leakage inductance, Llr
Elements for estimating motor inertia (J) and friction constant (B)
The block uses the parameter settings to generate an output bus containing the configuration elements. You can use the configuration elements in these ACIM parameter estimation blocks:
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
Output
Config — Bus signal
bus
The bus signal includes these configuration elements.
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 |
The configuration elements are analogous to the block parameters. For more information about these elements, see Parameters.
Data Types: single
Parameters
Number of pole pairs — Number of motor pole pairs
2
(default) | scalar
Number of pole pairs available in the induction motor.
Rated frequency (Hz) — Motor rated frequency
50
(default) | scalar
Rated frequency of the induction motor (in Hertz).
Nominal motor current (A) — Motor nominal current
2
(default) | scalar
Rated current of the induction motor (in Amperes).
Nominal voltage (V) — Motor nominal voltage
24
(default) | scalar
Rated voltage of the induction motor (in Volts).
Maximum inverter current (A) — Maximum measurable current
21
(default) | scalar
Maximum current (in Amperes) that the system (including inverter and controller) can measure.
Board resistance (ohm) — Inverter bridge resistance
0.0043
(default) | scalar
Resistance in the path of phase currents (excluding motor resistance). You can obtain this value from the datasheet of the inverter hardware.
Current sense gain (A/ADC Count) — Current per ADC count
0.0105
(default) | scalar
Gain of the current sense circuit of the inverter. This value determines the current (in Amperes) corresponding to one analog-to-digital converter (ADC) count (resolution of the measurable current range).
Voltage sense gain (V/ADC Count) — Voltage per ADC count
0.0098
(default) | scalar
Gain of the voltage sense circuit of the inverter. This value determines the voltage (in Volts) corresponding to one analog-to-digital converter (ADC) count (resolution of the measurable voltage range).
Measurement time (sec) — Time used to measure and average-out current
5
(default) | scalar
Time used to measure and average-out the peaks in the current response to the open-loop operation of the induction motor. For more details about Id0 estimation, see Id0 Estimator.
Open loop ramp time (sec) — Time allotted to ramp up frequency
3
(default) | scalar
Time that you want to allot for the motor operation frequency to ramp up and reach 90 percent of the motor rated frequency. For more details about Id0 estimation, see Id0 Estimator.
Estimation time (sec) — Time to run Rs estimation algorithm
2
(default) | scalar
Time that you want to allot to run the motor resistance (Rs) estimation algorithm. This value defines the time duration for which the ACIM Rs Estimator block injects each voltage to measure the motor resistance. For more details about Rs estimation, see ACIM Rs Estimator.
Vd reference voltage 1 (PU) — First reference voltage for Rs estimation
0.1
(default) | scalar
The first reference motor-phase voltage (in per-unit) that the ACIM Rs Estimator block uses for measuring motor resistance (Rs). By default, the block sets this field to 10 percent of the inverter DC voltage. For more details about Rs estimation, see ACIM Rs Estimator. For more details about the per-unit system, see Per-Unit System.
Vd reference voltage 2 (PU) — Second reference voltage for Rs estimation
0.2
(default) | scalar
The second reference motor-phase voltage (in per-unit) that the ACIM Rs Estimator block uses for measuring motor resistance (Rs). By default, the block sets this field to 20 percent of the inverter DC voltage. For more details about Rs estimation, see ACIM Rs Estimator. For more details about the per-unit system, see Per-Unit System.
Frequency 1 as a ratio of rated frequency (PU) — Ratio of first injected low frequency over rated frequency
0.1
(default) | scalar
Ratio of the first injected low frequency over the rated frequency of the induction motor (in per-unit). For more details about the estimation process, see RrL Estimator. For more details about the per-unit system, see Per-Unit System.
Frequency 2 as a ratio of rated frequency (PU) — Ratio of second injected low frequency over rated frequency
0.2
(default) | scalar
Ratio of the second injected low frequency over the rated frequency of the induction motor (in per-unit). For more details about the estimation process, see RrL Estimator. For more details about the per-unit system, see Per-Unit System.
High Frequency for Lm (Hz) — Frequency of third injected signal
200
(default) | scalar
Frequency of the third (high frequency) signal (in Hertz) injected by the block for mechanical parameter estimation. For more details about the estimation process, see RrL Estimator.
Voltage sweep start value voltage (PU) — Initial voltage at which voltage sweep begins
0.1
(default) | scalar
Initial voltage (of the first and second low-frequency signals that the block injects, in per-unit) at which the voltage sweep begins. For more details about the estimation process, see RrL Estimator. For more details about the per-unit system, see Per-Unit System.
Voltage sweep step value voltage (PU) — Step size for voltage sweep
0.0125
(default) | scalar
Step size that the block uses to perform voltage sweep on the two injected low frequency signals (in per-unit). For more details about the estimation process, see RrL Estimator. For more details about the per-unit system, see Per-Unit System.
High frequency injection voltage (PU) — Voltage of third injected signal
0.1
(default) | scalar
Voltage of the third (high frequency) signal (in per-unit) injected by the block for mechanical parameter estimation. For more details about the estimation process, see RrL Estimator. For more details about the per-unit system, see Per-Unit System.
Current measurement delay (s) — Delay in current measurement
2 * 50e-6
(default) | scalar
Time delay between an instance of current change and the point of time when the changed current is measured in the microcontroller.
Closed loop duration (sec) — Closed-loop motor run duration
5
(default) | scalar
Duration (in seconds) for which the ACIM Mechanical Parameter Estimator block runs the motor using closed-loop control before initiating coast-down. For more information about the estimation process, see ACIM Mechanical Parameter Estimator.
Closed loop speed (RPM) — Closed-loop motor speed
950
(default) | scalar
Speed (in RPM) at which the ACIM Mechanical Parameter Estimator block runs the motor using closed-loop control. For more information about the estimation process, see ACIM Mechanical Parameter Estimator.
Iq reference current for FOC (PU) — Reference current for FOC when estimating J and B
0.2
(default) | scalar
Reference current, Iq, to achieve the reference speed specified in the Closed loop speed (RPM) parameter. For more information about the estimation process, see ACIM Mechanical Parameter Estimator.
Specify current controller gains — Specify PI current controller gains
off
(default) | on
Select this parameter to enable these fields:
Proportional gain
Integral gain
You can use these fields to enter the proportional and integral gains of the PI current controllers that implement closed-loop control to estimate J and B.
If you clear this parameter, the block automatically computes the proportional and integral gains.
To know more about the estimation process, see ACIM Mechanical Parameter Estimator.
Proportional gain — Proportional gain of PI controller
1
(default) | scalar
Proportional gain, kp, of the PI current controller that implements field-oriented control to run the motor in closed-loop control and estimate J and B.
Dependencies
To enable this parameter, select the Specify current controller gains parameter.
Integral gain — Integral gain of PI controller
1000
(default) | scalar
Integral gain, ki, of the PI current controller that implements field-oriented control to run the motor in closed-loop control and estimate J and B.
Dependencies
To enable this parameter, select the Specify current controller gains parameter.
Speed lower limit for inertia estimation (RPM) — Lower speed limit during coast-down
100
(default) | scalar
Lower speed limit during coast-down at which the ACIM Mechanical Parameter Estimation block registers the timestamp for estimating motor inertia. For more details about the estimation process, see ACIM Mechanical Parameter Estimation.
Parameter estimation sample time (sec) — Sample time for parameter estimation
50e-6
(default) | scalar
Sample time for the parameter estimation algorithm. This parameter defines the sample time for these parameter estimation blocks for AC induction motors:
Id0 Estimator
ACIM Rs Estimator
Rr L Estimator
ACIM Mechanical Parameter Estimator
Extended Capabilities
C/C++ Code Generation
Generate C and C++ code using Simulink® Coder™.
Version History
Introduced in R2023a
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