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Table 2 Rule base of fuzzy controller MATLAB/Fuzzy Logic Toolbox is used to simulate FLC which can be integrated into simulations with Simulink. The FLC designed through the FIS editor is transferred to Matlab-Workspace by the command “E Simulink environment provides a direct access to t Workspace in BLDC motor drive simulation. Figure 11 Export to Workspace”. Then, he FLC through the Matlab- shows the simulink diagram of Fuzzy logic and PID controllers. These control algorithms can be compared by using switch block. If the mid-point of switch block is ‘-1’, FLC is selected, and in case the mid-point of switch block is ‘1’, the PID is selected.

Table 2 Rule base of fuzzy controller MATLAB/Fuzzy Logic Toolbox is used to simulate FLC which can be integrated into simulations with Simulink. The FLC designed through the FIS editor is transferred to Matlab-Workspace by the command “E Simulink environment provides a direct access to t Workspace in BLDC motor drive simulation. Figure 11 Export to Workspace”. Then, he FLC through the Matlab- shows the simulink diagram of Fuzzy logic and PID controllers. These control algorithms can be compared by using switch block. If the mid-point of switch block is ‘-1’, FLC is selected, and in case the mid-point of switch block is ‘1’, the PID is selected.

Related Figures (16)

Figure 1. Fuzzy logic controlled BLDC motor drive system. The proposed control system, which contains two loops, is shown in Figure 1. he first loop is the current control loop that accomplishes torque control of BLDC 1otor and the second loop is the speed control loop that adjusts the speed of BLDC otor.
Figure 1. Fuzzy logic controlled BLDC motor drive system. The proposed control system, which contains two loops, is shown in Figure 1. he first loop is the current control loop that accomplishes torque control of BLDC 1otor and the second loop is the speed control loop that adjusts the speed of BLDC otor.
Figure 4. Simulink diagram for generating back EMF from rotor positions.
Figure 4. Simulink diagram for generating back EMF from rotor positions.
Figure 6. The generation of inverter line-to-line voltages 2.3 Reference Current Generator
Figure 6. The generation of inverter line-to-line voltages 2.3 Reference Current Generator
2.4 Current Control Block In PWM current control block, the reference phase currents (i, ref ,i,ref ,i,ref ) are Ip ES If EE II EI IIE IIE IS IID IEE EILEEN Sf ESSE EES ESE IES NI EA OM FE OF OPO ™ compared with the motor’s actual phase currents (i,,i,,i,). The current errors are calculated as shown in Equation (13). These errors are applied to inverter hysteresis band (- th,) and the switching signals of three-phase PWM inverter system are generated according to the switching states. As shown in Figure 8.b, the hysteresis current control is performed in the function block fa(s) by using the measured phase current i,, the reference current Imax, and the rotor position 0, where the function block fa(s) is a term which functio [16]. consists of Equation (13) and (14). From the hysteresis block, the switching n S_a, S_b, and S ¢c are defined to model the operation of the PWM inverter
2.4 Current Control Block In PWM current control block, the reference phase currents (i, ref ,i,ref ,i,ref ) are Ip ES If EE II EI IIE IIE IS IID IEE EILEEN Sf ESSE EES ESE IES NI EA OM FE OF OPO ™ compared with the motor’s actual phase currents (i,,i,,i,). The current errors are calculated as shown in Equation (13). These errors are applied to inverter hysteresis band (- th,) and the switching signals of three-phase PWM inverter system are generated according to the switching states. As shown in Figure 8.b, the hysteresis current control is performed in the function block fa(s) by using the measured phase current i,, the reference current Imax, and the rotor position 0, where the function block fa(s) is a term which functio [16]. consists of Equation (13) and (14). From the hysteresis block, the switching n S_a, S_b, and S ¢c are defined to model the operation of the PWM inverter
Table 1 Reference currents of BLDC motor
Table 1 Reference currents of BLDC motor
fuzzy membership function is defined for each input and output values by seven clusters. Figure 10 illustrates the membership function used to fuzzify two input values (e,,e,) and defuziffy output (uw) of the fuzzy controller. For seven clusters in the membership functions, seven linguistic variables are defined as: Negative Big (NB), Negative Medium (NM), Negative Small (NS), Zero (Z), Positive Small (PS), Positive Medium (PM), and Positive Big (PB). Figure 10. Membership functions of fuzzy controller
fuzzy membership function is defined for each input and output values by seven clusters. Figure 10 illustrates the membership function used to fuzzify two input values (e,,e,) and defuziffy output (uw) of the fuzzy controller. For seven clusters in the membership functions, seven linguistic variables are defined as: Negative Big (NB), Negative Medium (NM), Negative Small (NS), Zero (Z), Positive Small (PS), Positive Medium (PM), and Positive Big (PB). Figure 10. Membership functions of fuzzy controller
Figure 11. Simulink diagram of fuzzy logic and PID controllers Realization of Fuzzy Logic Controlled Brushless DC Motor Drives
Figure 11. Simulink diagram of fuzzy logic and PID controllers Realization of Fuzzy Logic Controlled Brushless DC Motor Drives
BLDC motor specifications used in simulation are shown in Table 3. The waveforms of generated back EMF according to the rotor position at 4050 rpm are EMF waveforms are demonstrated in Figure 12.a. Three-phase symmetric back | produced from the rotor position. The rotor position changes from 0 to 27 per electric cycle 0.0148s at 4050 rpm and the amplitude of the back EMF is 17.78 V. Figure 12.b shows the phase-current waveforms. The actual phase currents obtained by the hysteresis control algorithm are synchronized with their counterpart back EMF waveforms.
BLDC motor specifications used in simulation are shown in Table 3. The waveforms of generated back EMF according to the rotor position at 4050 rpm are EMF waveforms are demonstrated in Figure 12.a. Three-phase symmetric back | produced from the rotor position. The rotor position changes from 0 to 27 per electric cycle 0.0148s at 4050 rpm and the amplitude of the back EMF is 17.78 V. Figure 12.b shows the phase-current waveforms. The actual phase currents obtained by the hysteresis control algorithm are synchronized with their counterpart back EMF waveforms.
in Figure 13. In order to hold the currents to be switched between the hysteresis upper and lower bands, the switching function signals are only produced during the 120° conduction periods. The positive and negative values represent the upper and lower switch or diode under the conducting state. The line-to-line voltage waveforms are obtained by using the switching function S_a. The produced line-to-line voltage (vas) according to the conduction modes is demonstrated in Figure 14. Since Tl and T6 are simultaneously active as seen in Figure 3, the phase A and the phase B currents are positive and negative, respectively Figure 15 shows the dynamic responses of the speed, torque and Imax, respectively. The reference value of maximum current (Imax) is computed from the generated constant torque reference, consequently it is used in the hysteresis control block. Furthermore, the control algorithms, FLC and PID can be compared by using developed model. As shown in Figure 16 (a) and (b), if the PID controller is used, the real speed and torque reach the desired value in 6.5ms. On the other hand, if FLC is used, the real speed and torque reach the desired value in 5ms. In conclusion it can be said that unlike the classical controller, FLC is more effective in BLDC motor drives.
in Figure 13. In order to hold the currents to be switched between the hysteresis upper and lower bands, the switching function signals are only produced during the 120° conduction periods. The positive and negative values represent the upper and lower switch or diode under the conducting state. The line-to-line voltage waveforms are obtained by using the switching function S_a. The produced line-to-line voltage (vas) according to the conduction modes is demonstrated in Figure 14. Since Tl and T6 are simultaneously active as seen in Figure 3, the phase A and the phase B currents are positive and negative, respectively Figure 15 shows the dynamic responses of the speed, torque and Imax, respectively. The reference value of maximum current (Imax) is computed from the generated constant torque reference, consequently it is used in the hysteresis control block. Furthermore, the control algorithms, FLC and PID can be compared by using developed model. As shown in Figure 16 (a) and (b), if the PID controller is used, the real speed and torque reach the desired value in 6.5ms. On the other hand, if FLC is used, the real speed and torque reach the desired value in 5ms. In conclusion it can be said that unlike the classical controller, FLC is more effective in BLDC motor drives.
Figure 15 Electromagnetic torque, speed of BLDC motor, and maximum current (Imax)
Figure 15 Electromagnetic torque, speed of BLDC motor, and maximum current (Imax)
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Electrical EngineeringRenewable EnergyBLDC MotorComputational and Mathematical Modeling
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