PMSM Rs Estimator

Estimate stator resistance (R_s) of permanent magnet synchronous motor (PMSM)

Since R2023a

• 

Libraries:
Motor Control Blockset / Parameter Estimation / PMSM Parameter Estimation

Description

The PMSM Rs Estimator block computes the stator resistance of a PMSM 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 PMSM Parameters Using Parameter Estimation Blocks

Uses the parameter estimation blocks provided by Motor Control Blockset™ to estimate these parameters of a permanent magnet synchronous motor (PMSM) with a quadrature encoder sensor:

• Open Model

Estimate PMSM Parameters Using Parameter Estimation Blocks on Real-Time Systems

Uses the parameter estimation blocks provided by Motor Control Blockset™ to estimate these parameters of a permanent magnet synchronous motor (PMSM):

• Open Model

Ports

Input

Iabc — Three-phase current response

vector

The three-phase current response (in amperes) 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 (in volts) that you provide to the inverter.

Data Types: single

StartStop — Control signal for R_s estimation

logical

Signal that either starts or stops R_s estimation:

• 1 (rising edge of a pulse) — This signal initiates the R_s estimation process.

• 0 (falling edge of a pulse) — This signal immediately stops the R_s estimation process. If you interrupt the estimation process abruptly before completion, the block does not compute or output the R_s 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 speed of motor			RPM
	Rated current of motor			A
	Maximum measurable inverter current			A
	Board resistance			ohms
	Current sense gain			A/ADC Count
	Voltage sense gain			V/ADC Count
	Parameter estimation sample time			seconds
Elements for estimating motor inductances (Ld and Lq)	Maximum frequency			Hz
	Minimum frequency			Hz
	Step for frequency sweep			Hz
	Frequency step size for estimation			Hz
	Number of frequencies for estimation			-
Elements for estimating back EMF constant (Ke), motor inertia (J), and friction constant (B)	Back EMF estimation time			seconds
	Back EMF estimation maximum speed limit			RPM
	Specify current controller gains (off/on)			-
	Proportional gain			-
	Integral gain			-
	Iq reference current as a ratio of rated motor current			PU current
	Lower speed limit for inertia estimation			RPM

You can connect this input port to the Config output port of the PMSM Parameter Estimation Configurator block.

Data Types: single

Output

Vabc — a, b, and c-axis stator reference voltage components

vector

Stator reference voltage components along the a, b, and c axes of the abc reference frame. Each voltage component has a range between -1 and 1.

Data Types: single

Rs — Estimated stator resistance

scalar

Estimated stator resistance (in ohms) of the PMSM.

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	Rs estimation did not start yet.	-
		1	Rs estimation is in progress.	-
		2	Rs estimation completed successfully.	-
		8000	Rs estimation failed because the current feedback from motor did not increase proportionally to the rise in the injected voltage.	-

Data Types: single

Extended Capabilities

C/C++ Code Generation
Generate C and C++ code using Simulink® Coder™.

Version History

Introduced in R2023a