BLDC Commutation Logic

Switch-commutation logic for brushless DC motors

• 

Libraries:
Simscape / Electrical / Control / BLDC Control

Description

The BLDC Commutation Logic block implements a commutation logic for brushless DC motors as part of this control algorithm.

The commutation logic is based on the Hall signals as summarized in this table.

Hall Sensors			Motor Phases
Hall a	Hall b	Hall c	Phase a	Phase b	Phase c
0	0	0	0	0	0
1	1	0	0	1	-1
0	1	0	-1	1	0
0	1	1	-1	0	1
0	0	1	0	-1	1
1	0	1	1	-1	0
1	0	0	1	0	-1
1	1	1	0	0	0

Examples

BLDC Hysteresis Current Control

Control the currents in a BLDC based electrical drive using hysteresis controllers. A DC voltage source feeds the BLDC through a controlled three-phase inverter. A ramp of current request is provided to the motor controller. The load torque is quadratically dependent on the rotor speed. The Control subsystem implements the hysteresis-based current control strategy. The Scopes subsystem contains scopes that allow you to see the simulation results.

• Open Model

Ports

Input

Hall — Hall sensor

vector

Hall sensor data.

Data Types: single | double

Direction — Motor direction

scalar

Direction of motor rotation.

Data Types: single | double

Output

abc — Motor phase

vector

Motor phase indicated by the commutation logic.

Data Types: single | double

Parameters

Sample time (-1 for inherited) — Block sample time

-1 (default) | positive scalar

Time, in s, between consecutive block executions. During execution, the block produces outputs and, if appropriate, updates its internal state. For more information, see What Is Sample Time? and Specify Sample Time.

If this block is inside a triggered subsystem, inherit the sample time by setting this parameter to -1. If this block is in a continuous variable-step model, specify the sample time explicitly using a positive scalar.

References

[1] Stirban, A., I. Boldea, and G. D. Andreescu. "Motion-Sensorless Control of BLDC-PM Motor With Offline FEM-Information-Assisted Position and Speed Observer." IEEE Transactions on Industry Applications. 48, no. 6 (2012): 1950-1958.

Extended Capabilities

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

Version History

Introduced in R2018a