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DC model based IMC method for brushless DC motor speed control

This paper focuses on a novel idea of using DC motor model-based to build Forward and Inverse Model of internal model control (IMC) method for brushless DC motor (BLDC) speed control. | Journal of Automation and Control Engineering Vol. 4, No. 2, April 2016 DC Model-based IMC Method for Brushless DC Motor Speed Control Hon H. Trinh and Thinh D. Le Faculty of Electrical and Electronic Engineering, Ho Chi Minh City University of Technology, Vietnam Email: {trinhhoanghon09, thinh1113}@gmail.com leads to the concept of robustness control [9]. There were some researches about this issue such as using model reference adaptive backstepping approach [10], auto tunning algorithm [11], and neural net-based [12]. The internal model control (IMC) which was introduced by Garcia and Morari in 1980’s [13] and widely applied in chemical process control is another typical robustness control method. IMC method is very easily designed based on system model, well working with linear system, controlling output response through a simple low-pass filter, and very robust with wide ranges changing of parameters. However, it suffers some drawbacks as problems with non-linear and multi-input multi-output (MIMO) systems, especially large amount of calculation [14, 15]. There are researches which simplify the IMC with phase-lock loop assisting for BLDC speed control [16, 17]. However, it seems very rare report about solving the major weakness of IMC method which is large amount calculating. Hence, this paper describes a solution to reduce IMC method calculation for BLDC speed control by using DC model-based instead of BLDC’s. To compare between the two model-based IMC systems, a BLDC motor with 3 Hall sensors and sinusoidal backEMF is worked with 3-phase sinusoidal inputs voltage. In addition, the BLDC motor’s parameters and coefficients are copied from reference [18]. The remaining parts of this paper are arranged as follows. First, the modeling of BLDC motor is based on its mathematical equations is expressed in Section II. Then, in Section III, the detail construction of IMC method for controlling speed of BLDC motor based on BLDC model is clearly presented. After that,