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With the application of SiC power metal-oxide-semiconductor field-effect transistor (MOSFET) in high voltage power converters, switching frequency and speed increase. Thus, severe electromagnetic interference(EMI) problems occur. To predict EMI performances and evaluate other performances in the design phase, a simple and valid switch model is needed. However, so far, there are very few behavioral...
Applications of power converters in electric cars and trains are demanding highly integrated systems with reduced size and high reliability. To increase the power density, many advanced power converter systems were developed utilizing the new wide-bandgap semiconductors or implementing high switching frequency. However, literatures rarely demonstrate any method to optimize the layout of the power...
For evaluate the thermal behavior of a permanent magnet motor under different types of losses and various loss distributions, a simplified thermal circuit is proposed. The result shows that, the model presented in the companion paper is suitable to use in machine design with certain accuracy.
In this paper, the power flow management algorithms for a power generation system is presented. An Energy Control Unit (ECU) was used to monitor and optimize the power flow from the microturbine-generation to the battery and the load, to improve not only the dynamic performance but also the safety and reliability of the power generation system Finally, an energy management algorithm and its behavior...
Three phase inverters, which are widely used in motor drive systems, produce high level electromagnetic interference (EMI). To evaluate EMI performance in the design phase is of great importance. In this paper, computer-aided time-domain simulation, which is straightforward and convenient is used followed by fast Fourier transform (FFT) approach. The simulated common mode (CM) and differential mode...
This paper focuses on the system design and control methods of the hybrid energy storage systems. The parameters of three different power supplies are designed based on the dive length and the cascade utilization requirement of material and energy flow. Based on the analysis of the energy system demand and the characteristics of the batteries, two electrical architectures are proposed and the DC bus...
The Unit Power Factor (UPF) operation of interior Permanent Magnet Synchronous Generator (IPMSG)-rectifier system is discussed in detail. The scheme is focus on the control of the classical architecture of IPMSG-Voltage source rectifier(VSR) which is widely used in All-Electric Ship. And the unit power factor control is applied to the generator-side converter by a reasonable allocation of d- and q-axis...
The hottest spot temperature exists in the end-winding of the motor. Therefore, effectively reduce the winding temperature becomes the key of the thermal design. Direct cooling means that the coolant directly contacts with the stator and winding. It provides very efficient cooling. In this paper, a motor cooled only by water is reformed into a motor cooled by both water and oil. The experiments are...
For gaining an effective cooling performance for motor, water cooling is commonly utilized. But as the requirement for power density increasing, solely the water cooling is not sufficient. This is duo to the thermal resistance of the end winding to the water is large. To obtain lower temperature of the end winding, a new cooling method is studied. The stator and the rotor are separated by an ultrathin...
The harmonic issue of generator-rectifier system is discussed in this paper. A general method for determining the theoretical harmonic components of the regular sampled symmetrical SVPWM is presented. The analytical expression for SVPWM was validated by comparing the analytical calculated results with experimental measurements. The relationships among Total Harmonic Distortion, modulation index, Carrier/fundamental...
This paper provides an analytical nonlinear model based on flux density of rotor and Winding function of the PMSM, which take into account the magnetic saturation. This model gives a clear physical picture for the saturation phenomenon in the d- and q-axis representation. Moreover, the saturation effect on the machine d- and q-axis synchronous reactance is investigated and the contributions of both...
This paper presents a universal parametric magnetic network model for coreless stator axial flux permanent magnet (AFPM) machines. To account for three-dimensional field effects in an AFPM machine, a multilayer modeling method is used to estimate both the axial and tangential magnetic field component in the air gap. A magnetic network model of magnets are used to correct the distribution of air gap...
For evaluate the thermal behavior of a permanent magnet motor under different types of losses and various loss distributions, a simplified thermal circuit is proposed. This topic is split into two separated papers. The first paper focuses on the building of the model and to evaluate key parameters. The experiment to verify the accuracy of the model is presented in a separated paper. The method proposed...
Electric Motors for Unmanned Underwater Vehicles (UUV) Propulsion must have high efficiency for maximum utilization of the energy from batteries. This paper aims to address how to achieve the optimal system efficiency of multi-motor drive system. Based on the estimation of the real-time load condition and the efficiency optimization strategy, digital signal processor(DSP) coordinates the work between...
Permanent-magnet synchronous motor (PMSM) drives are widely used for high-performance industrial applications where torque smoothness is an essential requirement. However, the parasitic torque pulsations deteriorates the drive performance particularly at low-speeds. To suppress these speed ripples, a parameter self-learning hybrid fuzzy controller was implemented with the objective of minimizing speed...
The selected harmonic elimination pulse width modulation (SHEPWM) is widely applied in the occasion of low switching frequency. In this paper the SHEPWM technique for inverter drives and power supplies are used by regular sampling technique. These PWM strategies can be generated on-line in real time using a microprocessor without resorting to the off-line numerical technique. Even number of switching...
This paper analyzed the charging electromagnetic torque in a topology of integrated on-board charger of electrical vehicle using open ending three-phase motor. By connecting the three windings of open ending motor to the three phase grid, charging electromagnetic torque is generated. The undesired charging torque is analyzed and the expression is verified through joint simulation in Maxwell and Simplorer...
Constant voltage generation for a wide speed and power range of PMSM(Permanent Magnet Synchronous Motor) control system is widely employed in separate power supplies. This paper presents a analysis of inner current and outer voltage double closed loops control strategy and the influence of PI parameters on system stability through establishing small signal model. Using it as a base, a control strategy...
The emergence of multi-mode hybrid drive system makes it possible for hybrid electric vehicles to remain high efficiency over a wide Speed Ratio range as well as reduce the requirement for motor capacity. The multi-mode hybrid drive system has been deeply investigated. A mathematical model to evaluate the system economy has been established, and the relationship between motor capacity and planetary...
Due to manufacturing simplicity and high power density, stator outer water cooling is utilized to achieve better cooling effects and the spiral cooling ducts are employed to increase the heat transfer capability. To obtain the thermal and hydraulic performance of a water jacket, a experiment method for water jacket is present. The proposed method is derived from winding function, and both winding...
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