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Speed Control of BLDC Motor using Sliding Mode Control

Speed Control of BLDC Motor using Sliding Mode Control

This video explains the speed control of BLDC motor using Sliding mode controller in MATLAB Simulink. This video explains the overall Simulink model of the speed control of the BLDC motor. The simulation results of reference speed command tracking is explained in this video.

Speed Control of BLDC Motor using Sliding Mode Control

Introduction

The Brushless DC (BLDC) Motor has gained popularity in recent years due to its high efficiency, low maintenance, and compact size. However, controlling the speed of a BLDC motor can be a challenging task, especially in applications where precision and accuracy are critical. In this article, we will discuss how to control the speed of a BLDC motor using sliding mode control.

What is a BLDC Motor?

A Brushless DC (BLDC) motor is a type of synchronous motor that is powered by DC voltage. Unlike traditional DC motors, BLDC motors do not have brushes, and the rotor is made up of permanent magnets. BLDC motors have gained popularity due to their high efficiency, low maintenance, and compact size.

What is Sliding Mode Control?

Sliding mode control is a robust control technique that is used to control systems with uncertain dynamics and external disturbances. It involves creating a sliding surface, which the system must track, and designing a control law that drives the system towards the sliding surface and maintains it there.

Background

BLDC motors are commonly used in industrial, automotive, and aerospace applications where high precision and accuracy are critical. To control the speed of a BLDC motor, a control system is needed that can maintain a constant speed despite changes in the load or input voltage. There are several control techniques available for controlling the speed of a BLDC motor, including Proportional-Integral-Derivative (PID) control, Field Oriented Control (FOC), and Sliding Mode Control (SMC). Of these, SMC is the most suitable for systems with uncertain dynamics and external disturbances.

Advantages of Sliding Mode Control

Sliding mode control has several advantages over other control techniques for controlling the speed of a BLDC motor. These include:

  • Robustness: SMC is a robust control technique that can handle uncertainties in the system dynamics and external disturbances.

  • Fast Response: SMC provides a fast response time, which is critical in applications where rapid changes in speed are required.

  • No Need for Feedback Linearization: Unlike FOC, SMC does not require feedback linearization of the motor model, which can be a complex and time-consuming task.

Conclusion

In conclusion, controlling the speed of a BLDC motor can be a challenging task, especially in applications where precision and accuracy are critical. Sliding mode control is a robust control technique that can handle uncertainties in the system dynamics and external disturbances.


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