Papers by Mohsen Ebadpour
The braking performance of a vehicle is an important factor in vehicle safety. A successfully
des... more The braking performance of a vehicle is an important factor in vehicle safety. A successfully
designed braking system for a vehicle must always meet the distinct demand of quickly reducing vehicle
speed and maintaining vehicle direction controllable by the steering wheel. It has been proved that for a
certain ratio of wheel rotation and vehicle speed, braking force is maximum. The main function of
nowadays braking systems which is known as anti-lock braking system (ABS) first is to prevent wheels from
locking, second bringing the vehicles slip to the ideal slip. The proposed method in this paper is a
combination of the principles which are used in ABS and electrical braking systems and consists of two
mechanical and electrical parts. Simulation of torque control and slip control system design has been
performed with MATLAB/Simulink software. To prove the high performance of proposed braking system a
road with variable and rather small adhesive coefficient, which conventional brakes face with problem on
it, has been considered. The reliability of proposed method has been proved.
The objective of this paper is to build a simple current controlled modulation technique for high... more The objective of this paper is to build a simple current controlled modulation technique for high performance and extensively used Brushless DC (BLDC) motors. It is based on the generation of quasi-square current waveforms, using only one current controller for three phases. Due to reducing the commutation torque ripples in proposed control system, the acoustic noise of motor is decreased. The commutation compensation technique is based on a strategy that the current slopes of the incoming and the outgoing phases during the commutation interval can be equalized by a proper duty-ratio control. In spite of conventional method, proposed method presents advantages such as very simple control scheme, balanced phase currents, and the stator currents are completely characterized by their maximum amplitude. In addition, triangular carrier modulation and PI controller for PWM generation are not needed anymore. For accessing better dynamic response characteristic for BLDC motor speed, Particle Swarm Optimization (PSO) has been used to regulate the PID parameter of speed controller. The effectiveness of the proposed control method is verified through comparative studies and simulation results.
In this paper a parallel Hybrid Electric Vehicle
(HEV) is simulated based on the faulty condition... more In this paper a parallel Hybrid Electric Vehicle
(HEV) is simulated based on the faulty condition. A
dynamic output feedback robust Fault detection technique
is used to evaluate the faulty condition when the missoperation
cause that the output torque of parallel HEV,
has been disturbed. This paper presents the fault detection
method based on the mixed H2/H∞ approach, if the
measuring signals are faulty. The simulation are based on
the systems state space Model and then transferring it to
Linear Matrix Inequality (LMI) to obtain the sub-optimal
problem solution.
Development of Electric Vehicles (EVs) and Hybrid Electric Vehicles (HEVs) will offer many new op... more Development of Electric Vehicles (EVs) and Hybrid Electric Vehicles (HEVs) will offer many new opportunities and challenges to the power electronics industry, especially in the
development of the main traction motor drive. Both HEVs and EVs need a traction motor and a power inverter to drive the vehicle motor. The requirements for the power inverter include high peak power, low output harmonics, inexpensive circuit and low continuous power rating. Cascade
H-bridge (CHB) multilevel inverter with minimum output harmonics for electric/hybrid electric vehicle applications is proposed in this paper. Switching angles of switch devices are determined by selective harmonic elimination technique. So, the effect of low order harmonics are reduced, as
a result the efficiency of system has improved. Moreover, the number of DC voltage sources that used in the proposed inverter is less than conventional multilevel inverters that leads to reduce the inverter costs. A fundamental frequency switching methods has been used for modulation of
inverter and to produce a seven-level phase voltages. The effectiveness of the proposed system has been validated by simulation results on various conditions using PSCAD/EMTDC software.
For closed-loop current control of brushless dc (BLDC) motors, instantaneous phase currents are m... more For closed-loop current control of brushless dc (BLDC) motors, instantaneous phase currents are measured
using appropriate current sensors. Such sensors are often bulky, heavy, and expensive, making them appealing for elimination. Likewise, the use of two or more separated sensors can cause undesirable imbalances in the phase currents as well as pulsating torque due to mismatched in the current sensor sensitivities. To overcome these problems, a new single current strategy for high performance BLDC motor drives is proposed. It is based on estimation and regulation of phase currents, using two single sensors for dc-link voltage and current. In this method, the phase currents are reconstructed in a two-stage process including estimation and regulation. Estimation is based on dynamic motor model, while regulation relies on the inverter switches states and the measured dc-link current. Besides, to access better dynamic response characteristic of the motor speed, Particle Swarm Optimization (PSO) has been used to regulate the PID parameters of speed controller. The effectiveness of proposed system has been validated by comparative studies and simulation results.
Both Hybrid Electric Vehicles (HEVs) and Electric Vehicles (EVs) need a traction motor and a powe... more Both Hybrid Electric Vehicles (HEVs) and Electric Vehicles (EVs) need a traction motor and a power in-verter to drive the traction motor. The requirements for the power inverter include high peak power, opti-mum consumption of energy, low output harmonics and inexpensive circuit. In this paper, a new structure of multilevel inverter with reduced number of switches is proposed for electric vehicle applications. It consists of an H-bridge and an inverter in each phase which produces multilevel voltage by switching the dc voltage sources in series. As the number of switches are reduced, both conduction and switching losses will be de-creased, which leads to increase the efficiency of converter. The size and power consumption of driving cir-cuits are also reduced. The proposed three phase inverter can produces more number of voltage levels in the same number of the voltage source and reduced number of switches compared to the conventional inverters. This structure minimizes the total harmonic distortion (THD) of the output voltage waveforms. The structure of proposed multilevel inverter, modulation method, switching losses, THD calculation and simulation re-sults with PSCAD/EMTDC software are shown in this paper.
Brushless DC (BLDC) motors are widely used in a variety of applications such as industrial automa... more Brushless DC (BLDC) motors are widely used in a variety of applications such as industrial automation and consumer appliances. Moreover, minimizing the cost of the drive is
desirable for low cost applications. Cost reduction of the BLDC driver is achieved by reducing the number of switch devices and freewheeling diodes, cost down of control, and eliminating of hall and current sensors. In this paper, a cost-effective position sensorless control for four-switch
three-phase BLDC motor drives using a single current sensor is proposed. The whole working process of the BLDC motor is divided into six modes. Phase c involves four modes, including modes 2, 3, 5, and 6, only one switch will work in these modes. In modes 1 and 4, two switches will work simultaneously and current flows through phases a and b. The proposed position sensorless technique is based on the detection of zero crossing points (ZCPs) of three voltage
functions that are derived from the difference of the line voltages measured at the terminals of the
motor. Unlike the conventional methods, the proposed control strategy uses only one simple current controller for three phases. Due to its inherent low cost, the proposed control strategy is particularly suitable for cost sensitive product. The effectiveness of the proposed system has been validated by simulation results.
For closed-loop current control of brushless dc (BLDC) motors, instantaneous phase currents are m... more For closed-loop current control of brushless dc (BLDC) motors, instantaneous phase currents are measured using appropriate current sensors. Such sensors are often bulky, heavy, and expensive, making them appealing for elimination. Likewise, the use of two or more separated sensors can cause undesirable imbalances in the phase currents as well as pulsating torque due to mismatched in the current sensor sensitivities. To overcome these problems, a new single current strategy for high performance BLDC motor drives is proposed. It is based on estimation and regulation of phase currents, using two single sensors for dc-link voltage and current. In this method, the phase currents are reconstructed in a two-stage process including estimation and regulation. Estimation is based on dynamic motor model, while regulation relies on the inverter switches states and the measured dc-link current. Besides, to access better dynamic response characteristic of the motor speed, Particle Swarm Optimization (PSO) has been used to regulate the PID parameters of speed controller. The effectiveness of proposed system has been validated by comparative studies and simulation results.
Cost minimizing of the electrical machine drives is more attractive for low cost applications. Th... more Cost minimizing of the electrical machine drives is more attractive for low cost applications. The low cost BLDC driver is achieved by the reduction of switch device, cost down of control, and saving of hall and current sensors. In this paper, a simple position sensorless control strategy for four-switch threephase BLDC motor drives using single current sensor is proposed. The whole working process of the BLDC motor is divided into six modes. Phase c involves four modes, including modes 2, 3, 5, and 6. Only one switch will work in these modes. In modes 1 and 4, two switches will work simultaneously and current flows through phases a and b. The proposed position sensorless scheme is based on the detection of zero crossing points (ZCPs) of three voltage function that are derived from the difference of line voltages measured at the terminals of the motor. Unlike the conventional methods, proposed control strategy has been used only one simple current controller for three phases. The effectiveness of the proposed system has been validated by simulation results.
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Papers by Mohsen Ebadpour
designed braking system for a vehicle must always meet the distinct demand of quickly reducing vehicle
speed and maintaining vehicle direction controllable by the steering wheel. It has been proved that for a
certain ratio of wheel rotation and vehicle speed, braking force is maximum. The main function of
nowadays braking systems which is known as anti-lock braking system (ABS) first is to prevent wheels from
locking, second bringing the vehicles slip to the ideal slip. The proposed method in this paper is a
combination of the principles which are used in ABS and electrical braking systems and consists of two
mechanical and electrical parts. Simulation of torque control and slip control system design has been
performed with MATLAB/Simulink software. To prove the high performance of proposed braking system a
road with variable and rather small adhesive coefficient, which conventional brakes face with problem on
it, has been considered. The reliability of proposed method has been proved.
(HEV) is simulated based on the faulty condition. A
dynamic output feedback robust Fault detection technique
is used to evaluate the faulty condition when the missoperation
cause that the output torque of parallel HEV,
has been disturbed. This paper presents the fault detection
method based on the mixed H2/H∞ approach, if the
measuring signals are faulty. The simulation are based on
the systems state space Model and then transferring it to
Linear Matrix Inequality (LMI) to obtain the sub-optimal
problem solution.
development of the main traction motor drive. Both HEVs and EVs need a traction motor and a power inverter to drive the vehicle motor. The requirements for the power inverter include high peak power, low output harmonics, inexpensive circuit and low continuous power rating. Cascade
H-bridge (CHB) multilevel inverter with minimum output harmonics for electric/hybrid electric vehicle applications is proposed in this paper. Switching angles of switch devices are determined by selective harmonic elimination technique. So, the effect of low order harmonics are reduced, as
a result the efficiency of system has improved. Moreover, the number of DC voltage sources that used in the proposed inverter is less than conventional multilevel inverters that leads to reduce the inverter costs. A fundamental frequency switching methods has been used for modulation of
inverter and to produce a seven-level phase voltages. The effectiveness of the proposed system has been validated by simulation results on various conditions using PSCAD/EMTDC software.
using appropriate current sensors. Such sensors are often bulky, heavy, and expensive, making them appealing for elimination. Likewise, the use of two or more separated sensors can cause undesirable imbalances in the phase currents as well as pulsating torque due to mismatched in the current sensor sensitivities. To overcome these problems, a new single current strategy for high performance BLDC motor drives is proposed. It is based on estimation and regulation of phase currents, using two single sensors for dc-link voltage and current. In this method, the phase currents are reconstructed in a two-stage process including estimation and regulation. Estimation is based on dynamic motor model, while regulation relies on the inverter switches states and the measured dc-link current. Besides, to access better dynamic response characteristic of the motor speed, Particle Swarm Optimization (PSO) has been used to regulate the PID parameters of speed controller. The effectiveness of proposed system has been validated by comparative studies and simulation results.
desirable for low cost applications. Cost reduction of the BLDC driver is achieved by reducing the number of switch devices and freewheeling diodes, cost down of control, and eliminating of hall and current sensors. In this paper, a cost-effective position sensorless control for four-switch
three-phase BLDC motor drives using a single current sensor is proposed. The whole working process of the BLDC motor is divided into six modes. Phase c involves four modes, including modes 2, 3, 5, and 6, only one switch will work in these modes. In modes 1 and 4, two switches will work simultaneously and current flows through phases a and b. The proposed position sensorless technique is based on the detection of zero crossing points (ZCPs) of three voltage
functions that are derived from the difference of the line voltages measured at the terminals of the
motor. Unlike the conventional methods, the proposed control strategy uses only one simple current controller for three phases. Due to its inherent low cost, the proposed control strategy is particularly suitable for cost sensitive product. The effectiveness of the proposed system has been validated by simulation results.
designed braking system for a vehicle must always meet the distinct demand of quickly reducing vehicle
speed and maintaining vehicle direction controllable by the steering wheel. It has been proved that for a
certain ratio of wheel rotation and vehicle speed, braking force is maximum. The main function of
nowadays braking systems which is known as anti-lock braking system (ABS) first is to prevent wheels from
locking, second bringing the vehicles slip to the ideal slip. The proposed method in this paper is a
combination of the principles which are used in ABS and electrical braking systems and consists of two
mechanical and electrical parts. Simulation of torque control and slip control system design has been
performed with MATLAB/Simulink software. To prove the high performance of proposed braking system a
road with variable and rather small adhesive coefficient, which conventional brakes face with problem on
it, has been considered. The reliability of proposed method has been proved.
(HEV) is simulated based on the faulty condition. A
dynamic output feedback robust Fault detection technique
is used to evaluate the faulty condition when the missoperation
cause that the output torque of parallel HEV,
has been disturbed. This paper presents the fault detection
method based on the mixed H2/H∞ approach, if the
measuring signals are faulty. The simulation are based on
the systems state space Model and then transferring it to
Linear Matrix Inequality (LMI) to obtain the sub-optimal
problem solution.
development of the main traction motor drive. Both HEVs and EVs need a traction motor and a power inverter to drive the vehicle motor. The requirements for the power inverter include high peak power, low output harmonics, inexpensive circuit and low continuous power rating. Cascade
H-bridge (CHB) multilevel inverter with minimum output harmonics for electric/hybrid electric vehicle applications is proposed in this paper. Switching angles of switch devices are determined by selective harmonic elimination technique. So, the effect of low order harmonics are reduced, as
a result the efficiency of system has improved. Moreover, the number of DC voltage sources that used in the proposed inverter is less than conventional multilevel inverters that leads to reduce the inverter costs. A fundamental frequency switching methods has been used for modulation of
inverter and to produce a seven-level phase voltages. The effectiveness of the proposed system has been validated by simulation results on various conditions using PSCAD/EMTDC software.
using appropriate current sensors. Such sensors are often bulky, heavy, and expensive, making them appealing for elimination. Likewise, the use of two or more separated sensors can cause undesirable imbalances in the phase currents as well as pulsating torque due to mismatched in the current sensor sensitivities. To overcome these problems, a new single current strategy for high performance BLDC motor drives is proposed. It is based on estimation and regulation of phase currents, using two single sensors for dc-link voltage and current. In this method, the phase currents are reconstructed in a two-stage process including estimation and regulation. Estimation is based on dynamic motor model, while regulation relies on the inverter switches states and the measured dc-link current. Besides, to access better dynamic response characteristic of the motor speed, Particle Swarm Optimization (PSO) has been used to regulate the PID parameters of speed controller. The effectiveness of proposed system has been validated by comparative studies and simulation results.
desirable for low cost applications. Cost reduction of the BLDC driver is achieved by reducing the number of switch devices and freewheeling diodes, cost down of control, and eliminating of hall and current sensors. In this paper, a cost-effective position sensorless control for four-switch
three-phase BLDC motor drives using a single current sensor is proposed. The whole working process of the BLDC motor is divided into six modes. Phase c involves four modes, including modes 2, 3, 5, and 6, only one switch will work in these modes. In modes 1 and 4, two switches will work simultaneously and current flows through phases a and b. The proposed position sensorless technique is based on the detection of zero crossing points (ZCPs) of three voltage
functions that are derived from the difference of the line voltages measured at the terminals of the
motor. Unlike the conventional methods, the proposed control strategy uses only one simple current controller for three phases. Due to its inherent low cost, the proposed control strategy is particularly suitable for cost sensitive product. The effectiveness of the proposed system has been validated by simulation results.