Modeling and simulation of torque hysteresis controller for brushless DC motor drives
01 Sep 2012-pp 152-155
TL;DR: Model and simulation of a torque hysteresis controller for brushless DC motors and a new current blocking strategy is proposed to prevent the current drained from DC supply when the torque demand is set to zero, that can prolong the capacity voltage of batteries.
Abstract: This paper presents modeling and simulation of a torque hysteresis controller for brushless DC motors. Brushless DC (BLDC) motors can offer great advantageous compared to other machines used in industrial applications due to its compactness, high torque density, simpler controller and lower maintenance. At first the mathematical modeling of BLDC motor that is suitable to analyze the dynamic performance will be given. A method of torque hysteresis controller will be adapted to drive the motor such that the current (or torque) ripple can be restricted within the predefined band-gap. Moreover, a new current blocking strategy is proposed to prevent the current drained from DC supply when the torque demand is set to zero, that can prolong the capacity voltage of batteries. Some simulation results were carried out using MATLAB/Simulink to verify the proper modeling as well as functionality of the controller.
Citations
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TL;DR: The design of a high-gain boost converter optimized by a GWO algorithm is proposed to drive the BLDC-based pumping motor and the experimental results are verified using the dsPIC30F2010 controller.
Abstract: Photovoltaic (PV) water pumping systems are becoming popular these days. In PV water pumping, the role of the converter is most important, especially in the renewable energy-based PV systems case. This study focuses on one such application. In this proposed work, direct current (DC) based intermediate DC-DC power converter, i.e., a modified LUO (M-LUO) converter is used to extricate the availability of power in the high range from the PV array. The M-LUO converter is controlled efficiently by utilizing the Grey Wolf Optimizer (GWO)-based maximum power point tracking algorithm, which aids the smooth starting of a brushless DC (BLDC) motor. The voltage source inverter’s (VSI) fundamental switching frequency is achieved in the BLDC motor by electronic commutation. Hence, the occurrence of VSI losses due to a high switching frequency is eliminated. The GWO optimized algorithm is compared with the perturb and observe (P&O) and fuzzy logic based maximum power point tracking (MPPT) algorithms. However, by sensing the position of the rotor and comparing the reference speed with the actual speed, the speed of the BLDC motor is controlled by the proportional-integral (PI) controller. The recent advancement in motor drives based on distributed sources generates more demand for highly efficient permanent magnet (PM) motor drives, and this was the beginning of interest in BLDC motors. Thus, in this paper, the design of a high-gain boost converter optimized by a GWO algorithm is proposed to drive the BLDC-based pumping motor. The proposed work is simulated in MATLAB-SIMULINK, and the experimental results are verified using the dsPIC30F2010 controller.
24Â citations
03 Jun 2013
TL;DR: In this article, a current blocking strategy of brushless DC motor drive is proposed to prolong the capacity voltage of batteries per charge in electric vehicle applications, which can offer a robust control and quick torque dynamic performance.
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.
22Â citations
Cites result from "Modeling and simulation of torque h..."
...It can be shown that the production of torque in BLDC is quite similar to that of brushed DC motor with simple control algorithm [2][3]....
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28 Jul 2016
TL;DR: In this article, the exact electrical equivalent circuit of a BLDC motor related to mechanical and electrical equations is introduced, and the electrical equations which have the same structure as mechanical equations are given.
Abstract: BLDC motors are often used in many applications, such as Electric Vehicles (EVs) because of their simple structure, reliable operation, low maintenance, high dynamic speed, high torque and high efficiency. Basically, a BLDC motor is similar to conventional DC motor in performance but without brushes. Many papers and journals have been published regarding to the operation, speed control methods, starting methods, current control methods, and so on. One of ways to know the characteristic of BLDC motor is by modeling and simulation. In this study, the exact electrical equivalent circuit of BLDC motor related to mechanical and electrical equations is introduced. The electrical equations which have the same structure as mechanical equations are given. Thus, all of mechanical components are expressed into electrical circuit element terms. Numerical example of BLDC motor parameters is given, so the analysis of BLDC motor with load and without load is obtained by using the exact electrical equivalent circuit.
11Â citations
28 Mar 2018
TL;DR: Open-loop as well as closed-loop control of BLDC Motor has been described with real-time simulation in MATLAB/Simulink environment and the corresponding results are presented as well.
Abstract: In recent few years, trends of BLDC motor involve in various applications from leading equipment due to higher power density, efficacy, household appliances to industrial drives. BLDC motor has been widely popular due to its higher torque density. It rarely needs maintenance due to its robust design and thereby being more reliable. Inverter fed BLDC motor consists of permanent magnet rotor whereas the back EMF produced in stator windings are trapezoidal. Regardless of commutator and brushes, phase commutation is attained by electronics system of commutation. In this paper, open-loop as well as closed-loop control of BLDC Motor has been described with real-time simulation in MATLAB/Simulink environment and the corresponding results are presented as well.
10Â citations
Cites background from "Modeling and simulation of torque h..."
...BLDC motors are widely perceived for servo drive applications and for traction of light electric vehicles due its major advantages as compared to the other motors of same size [17-24]....
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01 Dec 2016
TL;DR: A low cost position sensorless brushless DC motor drive that uses a low cost microcontroller and only one current sensor, which makes it a cost effective drive.
Abstract: A low cost position sensorless brushless DC motor drive is presented in this paper. The motor starts with simple align and go methodology, to a speed where a traditional sensorless algorithm based on winding back EMF, detects accurate commutation instants and then filtered line to line back EMF crossings are utilized to find the rotor position. The speed and current are controlled with variable structure sliding mode control. The drive uses a low cost microcontroller and only one current sensor, which makes it a cost effective drive. The performance of the presented drive is proved by simulation and experimentally on low cost high performance DSP microcontroller. The presented control drive is useful for developing low cost commercial and domestic applications.
9Â citations
Cites methods from "Modeling and simulation of torque h..."
...Back EMF zero crossing detection [4, 5, 6] is the most popular method because it requires less complex hardware and software but does not work well at lower speed....
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References
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TL;DR: In this paper, an improved invertor hysteresis current controller is proposed to coordinate the switching of the three-phase switches in the d-q phase plane, where information of the current error derivative is further employed so that one can take more advantage of adding the zero voltage vector for reducing the switching frequency.
Abstract: In this paper, an improved invertor hysteresis current controller is proposed. It coordinates the switching of the three-phase switches in the d-q phase plane. In addition to the current error, information of the current error derivative is further employed so that one can take more advantage of adding the zero voltage vector for reducing the switching frequency. A simple hardware implementation of the improved hysteresis current controller is also proposed such that merits of the conventional hysteresis current controller can still be kept. Theoretical basis and some simulation and experimental results are presented to demonstrate the validity of the improved hysteresis current controller. >
159Â citations
TL;DR: The main benefit of the proposed dynamic overmodulation strategy is its simplicity, since it only requires a minor modification to the conventional DTC-hysteresis-based structure and does not require a space vector modulator.
Abstract: A dynamic overmodulation strategy for fast dynamic torque control in direct torque control (DTC)-hysteresis-based induction machine is proposed. The fastest dynamic torque response with a six-step mode can be achieved in the proposed method by switching only the most optimized voltage vector that produces the largest tangential component to the circular flux locus. This paper also discusses the performance of dynamic torque control in basic DTC in order to justify on how the proposed selected voltage vector results in excellent dynamic torque performance. The main benefit of the proposed method is its simplicity, since it only requires a minor modification to the conventional DTC-hysteresis-based structure and does not require a space vector modulator. To verify the feasibility of the proposed dynamic overmodulation strategy, simulation and experimentation, as well as comparison with the conventional DTC scheme, are carried out. Results showed a significant improvement in the dynamic torque response when compared to the conventional DTC-hysteresis-based method.
89Â citations
"Modeling and simulation of torque h..." refers background in this paper
...The control of torque can be established by controlling the three-phase current at its reference such that it will satisfy the equations (3) and (4)....
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TL;DR: The single-phase brushless dc motors are becoming widely used in low-power applications such as blower motors, computer disk-drive spindle motors, and in copiers and laser printers.
Abstract: Brushless dc motors are becoming widely used in low-power applications such as blower motors, computer disk-drive spindle motors, and in copiers and laser printers. For these applications, the brushless dc motor offers the following advantages: small size, reliability, no carbon dust from brushes, precise speed control, and potentially high efficiency. The most commonly used brushless dc motors are twoor three-phase permanent-magnet ac machines driven by a dc-to-ac inverter. The three-phase machine combined with a six-pulse full-bridge inverter often represents the best trade-off of machine iron and copper utilization with the cost of the inverter. Because of the prevalence of two-and three-phase devices, they are the brushless dc motors which have been analyzed the most extensively. On the other hand, there has been little investigation into the operation of the single-phase brushless dc motor. Single-phase motors, in general, suffer from slower starting characteristics, less efficient utilization of machine iron and copper, and higher losses. Therefore, single-phase motors are limited to low-power applications where rapid response and high efficiency are not required. The primary advantage of single-phase devices is the simplified source requirements. For example, a single-phase brushless dc motor requires only one-third the number of transistors and position sensors needed by a three-phase motor and can be powered by a single dc voltage source. Thus, in applications where cost is of greater importance than performance, the single-phase motor may be a superior alternative to a two-or three-phase motor.
36Â citations
24 Oct 2008
TL;DR: A new simple overmodulation strategy in direct torque control (DTC) of induction machines is presented, which increases the inverter voltage limit and therefore extends the constant torque region and proposes a dynamic overmodulations to obtain fast torque transient with six-step operation including the field weakening region.
Abstract: This paper presents a new simple overmodulation strategy in direct torque control (DTC) of induction machines. The strategy increases the inverter voltage limit and therefore extends the constant torque region. The minor modification on the conventional flux weakening method is also introduced to improve the torque capability in the field weakening region and hence improving the operation over a wide speed range. These strategies are implemented with a DTC-constant switching frequency (CSF) based system. To perform the DTC-CSF in overmodulation mode, the flux error status is modified before it is being fed to the voltage vector selection table. With this proposed strategy, a single-mode overmodulation based on stator flux vector control with smooth PWM to six-step transition is developed. This strategy also proposes a dynamic overmodulation to obtain fast torque transient with six-step operation including the field weakening region. The proposed strategy has been verified through computer simulations and shown to improve the torque capability of DTC induction motor drives with a fast dynamic torque response.
19Â citations
Proceedings Article•
01 Jan 2011
TL;DR: The results show that there is one stator pole arc ratio and pole shoe depth combination that produces the lowest cogging torque whilst maintaining a near trapezoidal back emf shape.
Abstract: This paper presents an investigative study into minimising the cogging torque of a novel three phase surface mounted PM brushless DC motor. The motor is novel because it has a non-integer stator-rotor pole ratio and also asymmetric stator pole arcs. In the paper, the results of the work demonstrate how the optimum stator pole asymmetric arc ratio and pole shoe radial depth or thickness can be found to minimise the cogging torque and to maintain a trapezoidal back EMF shape. An accurate 2D finite element modelling FEM software was employed to numerically analyse the magnetic field distribution inside the motor. The aim of the work is to optimise the design parameters for minimising the cogging torque. The results show that there is one stator pole arc ratio and pole shoe depth combination that produces the lowest cogging torque whilst maintaining a near trapezoidal back emf shape.
4Â citations
"Modeling and simulation of torque h..." refers background in this paper
...phase k (k = a,b or c) as given by (1)....
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