ABSTRACT:
This paper presents a current blocking strategy of
brushless DC (BLDC) motor drive to prolong the capacity voltage of batteries
per charge in electric vehicle applications. The BLDC motor employs a simple
torque hysteresis control (THC) that can offer a robust control and quick
torque dynamic performance. At first, a mathematical modeling of BLDC motor and
principle of torque hysteresis control will be described, so that the benefit
offered by the proposed current blocking strategy can be highlighted. It can be
shown that the current control method naturally provides current limitation, in
which the current error (or ripple) is restricted within the pre-defined
band-gap furthermore provide current protection. The benefit of proposed
current blocking strategy will be highlighted such that it can prevent the
current drained from the batteries when the torque demand is released to set to
0 Nm. The control scheme is validated and verified by the simulation and
experimental results.
KEYWORDS:
1.
Components
2.
Brushless DC motor
3.
Hall effect
4.
Current controller
5.
Electric vehicle (EV)
6.
Hybrid electric vehicle (HEV)
7.
Torque hysteresis controller (THC)
SOFTWARE: MATLAB/SIMULINK
BLOCK DIAGRAM:
Fig
1. Structure of Optimal Current Control drive for BLDC motor.
CONTROL BLOCK DIAGRAM:
Fig
2. Proposed current blocking strategy based on hysteresis comparator
EXPECTED SIMULATION RESULTS:
Fig
3. Motor currents are controlled such that follow their references which are
generated according to the hall effect signals (Time/div=0.5s/div).
Fig
4. Waveforms of output torque, speed and currents (a) THC without current
blocking strategy (b) THC with current blocking strategy.
CONCLUSION:
This
paper presented the modelling and experimental result of THC for BLDC motor.
The current controller has been applied to a BLDC drive and the results shows
that the current ripple stays within the hysteresis band as defined by the
controller. The proposed current blocking strategy shows that the energy
wastage from the batteries is prevented such that it can prolong the capacity
of voltage battery and it also showed that the hysteresis controller can offer
inherent current protection/limitation and robustness in controlling the motor
torque.
REFERENCES:
[1] Lefley, P., L.
Petkovska, and G. Cvetkovski. Optimization of the design parameters of an
asymmetric brushless DC motor for cogging torque minimization in Power
Electronics and Applications (EPE 2011), Proceeding of the 2011-14th European
Conference on 2011.
[2] Bahari N.,
Jidin A., Abdullah A. R. and Othman M. N., “Modeling and Simulation of Torque
Hysteresis Controller for Brushless DC Motor Drives”, IEEE Symposium on
Industrial Electronics and Applications ISIEA, 2012.
[3] Mayer, J.S.
and O. Wasynczuk, “Analysis and modelling of a single-phase brushless DC motor
drive system”, Energy Conversion, IEEE Transactions on, 1989. 4(3): p. 473-479.
[4] Jidin, A.,
Idris, N. R. N., Yatim, A. H. M., Sutikno, T. and Elbuluk, M. E. ‘An Optimized
Switching Strategy for Quick Dynamic Torque Control in DTC-Hysteresis-Based
Induction Machines’, IEEE Transactions on Industrial Electronics,2011,
Vol. 58, pp. 3391-3400.
[5] Norhazilina
Binti Bahari; Jidin, Auzani bin; Abdullah, Abdul Rahim bin; Md Nazri bin
Othman; Manap, Mustafa bin, "Modeling and simulation of torque hysteresis
controller for brushless DC motor drives," Industrial Electronics and
Applications (ISIEA), 2012 IEEE Symposium on , vol., no., pp.152,155, 23-26
Sept. 2012
