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REPRINT
Copyright © 2013 Praise Worthy Prize S.r.l. - All rights reserved International Review on Modelling and Simulations, Vol. 6, N. 6
1905 BLDC motor on duty cycle variation of PWM and
frequency.
a Tigger signals using PWM from logic circuit
b Tigger signals using PWM from driver circuit Figs. 14. PWM signals [12]
Duty cycle variation can make by fill DC box of control with number 0 to 5, which denote duty cycle in 0
to 100, while the frequency of PWM can be varied using time determination of sawtooth generator of
simulink control model.
This testing use BLDC motor that have nominal power 500 W, rotation speed 500 rpm and 48 V power
supply voltage. But in this testing the power supply used in 12 V.
Fig. 15 shows speed responds in this testing on duty cycle variation, while Figs. 16 and 17 show voltage and
current responds.
Fig. 15. Speed responds on duty cycle
Fig. 16. Voltage responds on duty cycle Fig. 17. Current responds on duty cycle
Fig. 18. Speed responds on frequency
Fig. 19. Voltage responds on frequency
Fig. 20. Current responds on frequency
Experiment result of speed responds is not linear as mentioned in 24, because in this equation some of
REPRINT
Copyright © 2013 Praise Worthy Prize S.r.l. - All rights reserved International Review on Modelling and Simulations, Vol. 6, N. 6
1906 variable considered in ideal condition. But voltage
responds is linear as defined in 23. Non linear correlation also happen on current responds. The non
linear function occurred if duty cycle in the duty cycle above of 70.
These phenomena can be explained using 21, where there is dependency on mechanical properties among
speed, load, friction, inertia and electric torque. Usually BLDC motor use PWM frequency above 6
kHz [10], but since the PCI only has the ability to transfer data at 10 kHz, so in this research the highest
PWM frequency is 800 Hz. This frequency obtained from trial and error, wherein the frequency able to give a
good shape of PWM. The highest PWM frequency has been used in the duty cycle variation as discussed
previously. In the following sections present BLDC motor responds in the PWM frequency variation at 60
duty cycle, particularly to obtain the speed responds, voltage and current of motor.
Figs. 18 and 19 show speed responds and voltage responds of PWM frequency variations. The responds
indicate that there is no influence of the PWM frequency to the motor speed and voltage. While for the current
responds as shown in Fig. 20, there are non linear correlations, like occurred on the variation of duty cycle.
VII. Conclusion
