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The dual motor powertrain (DMP) configuration is composed of gasoline direct injection (GDI) engine, two motors(one motor connects with input shaft of transmission, namely I-motor, another motor connects with output shaft of transmission, namely II-motor), automatic mechanical transmission (AMT), battery package and hybrid control system. The DMP hybrid system has the functions of engine start/stop...
This paper presents a new kind of direct torque control (DTC) system based on the inverter with double-frequency for the motor drives of electric vehicles (EVs). According to the theory of the converter with double-frequency, the topology of a new kind of inverter with double-frequency is derived, and the operation states of the new circuit are analyzed. This kind of inverter has good dynamic and...
With the increasing concern of gas emission, climate change and energy crises, electric vehicles (EV), especially fuel cell hybrid electric vehicles (FCHEV), develop rapidly in current days. Meanwhile, permanent magnet synchronous motor (PMSM) drive systems are widely used in EV because of their advantages in wide speed ranges, high efficiency and power density. However, limited by manufacture technology...
Because of its high performance, brushless DC motors are widely used in motor vehicles. In this paper, according to analysis of present motor control system, a novel hardware structure of motor control system was presented. It is based on Field Programmable Gate Arrays (FPGA) and Digital Signal Processor (DSP). According to the function needed in motor control and the structure feature of FPGA and...
Plug-in hybrid electric vehicles (PHEVs) are specialized hybrid electric vehicles that have the potential to obtain enough energy for average daily commuting from batteries. These batteries would be charged from the power grid and would thus allow for a reduction in the overall petroleum consumption. To implement the plug-in function, a single phase bidirectional AC-DC converter interfacing with the...
It is an important issue to develop an easy and high-performance powered wheelchair for the growing population of elderly people. In this research, a new method of all directional powered wheelchair (PWC) has been designed. The PWC consists of three motors to drive and to change the orientation of the wheels. The function and an experimental model are shown.
Hybrid vehicles, which employ a technology combining gasoline and electric motors, are a hot item these days for transporters looking for ways to cut their fuel bills. To date, commercial systems implement diesel assisted electrical drives. As such the electrical motor is placed in a series or parallel configuration to assist the combustion engine. In the series configuration, the generator mounts...
Resolver is widely used in electric drive system especially for hybrid electric vehicles (HEV). A resolver system includes not only a variable-reluctance resolver but also an excitation circuit, shielding cables and a resolver-to-digital (R/D) IC as a multi-physics system with electrical, magnetic, mechanical and control characteristics. This paper studies a resolver for HEV electric motor, and proposes...
The doubly salient permanent magnet (DSPM) motor is a new type of brushless machine and it offers advantages of high power density, wide speed range and simple structure. In this paper, a new drive topology for improvement of torque-ripple and fault-tolerance in an 8/6-pole DSPM motor is proposed. Based on co-simulation of magnetic and electrical circuit solvers, analysis of the proposed topology...
This paper proposes a vehicle stability control (VSC) scheme for a four-wheel-drive electric vehicle based on the control allocation techniques. The wheels of the electric vehicle are driven by the electric motor individually, which makes it more convenient to control tires forces and moments for stabilizing vehicle motion. But the over-actuated system is complex to control. The control allocation...
In order to improve the reliability and output performance of the drive system of electric vehicle (EV), a new type of interior fault-tolerant permanent magnet motor (FTPMM) with centrifugal rotor is proposed, and its systematic characteristics are analyzed. With the proper connection of windings and combination of the number of slots and poles, the capacity of limiting of short-circuit fault current...
This paper proposes an integrated in-wheel motor for electric vehicles. It can offer the advantages of lightweight, compact size, high efficiency and low-speed high-torque operation. The key is to artfully integrate a coaxial magnetic gear into a permanent-magnet (PM) brushless motor in such a way that they can share a common PM rotor, hence the low-speed requirement for direct driving and the high-speed...
This paper develops the concept of employing the redundant winding in a flux-switching permanent magnet (FSPM) machine. A new redundant FSPM machine is proposed for fault tolerant operation of critical applications. The redundant winding configuration is analyzed and the corresponding suitable control strategy for the post-fault is proposed. The electromagnetic performance of the redundant FSPM machine...
This paper presents a nine-switch three-level inverter used as an application for all-electric vehicle (EV) and hybrid-electric vehicle (HEV) motor drives. The proposed three-level inverter consists of a three-phase two-level inverter and three bidirectional power switches. The proposed inverter overcomes some shortcomings of two-level inverters, such as high switching frequency, high dv/dt and electromagnetic...
Two-speed transmission system is usually employed by an electric vehicle to improve efficiency of an electric driving system and drivability of vehicle powered solely by electric power, i.e. pure electric vehicle, or series hybrid electric vehicle. The improvement of the drivability and efficiency due to the application of the multi-speed transmission system is shown based on motor drive system characteristics,...
This paper proposes and implements a new outer-rotor permanent-magnet (PM) hybrid in-wheel motor drive for electric vehicles. Since the proposed PM hybrid motor drive artfully integrates two excitations (PMs and DC field windings) to produce magnetic field, it achieves the ability of a wide rang of flux control, which can offer a very high starting torque for electric vehicles cranking and extend...
An axial flux permanent magnet brushless motor is designed with variable stator alignment of independent stators, thus allowing field-weakening via a controllable and variable generated-voltage constant. This feature is particularly valuable in vehicle traction motors with large constant-power speed-ratio, where there is also a strong desire to eliminate gear changes and keep the overall size of the...
The active stabilisation of an HVDC distribution system with multiple constant power loads is presented. Each constant power load comprises a separate motor drive including the torque and speed control functions. By adding a simple admittance compensating controller to the current control loop of the constant power loads, the loads, and therefore the HVDC distribution system, are stabilised. Small-signal...
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