BLDC Configuration

Configure BLDC system parameters

Since R2023b

• 

Libraries:
Motor Control Blockset HDL Support / Electrical Systems / Motors

Description

The BLDC Configuration block generates the configuration signal for a brushless DC (BLDC) machine or motor. You can use this signal to update parameters of BLDC blocks that support FPGA deployment, such as the BLDC HDL block.

Examples

Six-Step Commutation of BLDC Motor Using Sensor Feedback

Use six-step commutation technique to control speed and direction of rotation of a three-phase BLDC motor.

• Open Model

Ports

Output

Config — Block configuration signal

vector

Configuration signal for a BLDC motor, which includes the following parameters that you configure using this block.

Configuration element			Units
Number of pole pairs			-
Stator phase resistance per phase			ohm
Stator d-axis inductance			Henries
Stator q-axis inductance			Henries
Permanent magnet flux linkage constant			Weber
Inertia			kgm^2
Back electromotive force, EMF			Vpk_LL/krpm Vpk_LL is the peak voltage line-to-line measurement
Viscous damping			N·m/(rad/s)
Mechanical input configuration (Torque or Speed)			-

Data Types: single

Parameters

Block Options

Mechanical input configuration — Select port configuration

Torque (default) | Speed

This table summarizes the input and output ports in each port configuration.

Mechanical input configuration parameter value			LdTrq/Spd port configuration
Torque			LdTrq
Speed			Spd

Sample Time (Ts) — Sample time after which block executes again

1e-6 (default) | scalar

The fixed time interval (in seconds) between every two consecutive instances of block execution.

Parameters

Number of pole pairs — Pole pairs

4 (default) | scalar

Number of pole pairs, P, in the motor.

Stator phase resistance per phase (Ohm) — Resistance of stator

0.02 (default) | scalar

Stator phase resistance per phase, R_s , in ohms.

Stator d-axis inductance (H) — d-axis inductance

1.7e-3 (default) | scalar

Stator inductance, L_d , in H.

Stator q-axis inductance (H) — q-axis inductance

3.2e-3 (default) | scalar

Stator inductance, L_q , in H.

Permanent flux linkage constant (Wb) — Flux linkage constant

0.2205 (default) | scalar

Permanent flux linkage constant, λ_pm , in Wb.

Inertia (kgm^2) — Physical inertia

0.0027 (default) | scalar

Physical inertia of the motor, J, in kg.m².

Viscous damping (Nm/rad/s) — Viscous damping

4.924e-4 (default) | scalar

Viscous damping of the motor, F, in Nm/(rad/s).

Static friction (Nm) — Static friction

0 (default) | scalar

Static friction in the motor, T_f , in Nm.

Version History

Introduced in R2023b