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This paper presents the current application situation of five-phase permanent magnet synchronous motor and control algorithms. The mathematical model is established through the coordinate transformation, meanwhile the linear decoupling equation of PMSM state is also derived, two-vector control algorithm (NTV-SVPWM) and four-vector control algorithm (NFV-SVPWM) are discussed especially. A modified...
In DC-biased sinusoidal current vernier reluctance machines (DC-biased-VRMs), the DC exciting winding and AC armature winding are integrated into one single winding. Therefore, the copper loss can be reduced with torque density increasing, and only one set of power electronic converter is demanded. This paper is to propose a DC-biased-VRMs drive with asymmetrical power electronics devices and corresponding...
In this paper, a dual parallel connected brushless direct current (BLDC) motors drive system fed by a single inverter is presented and the control method for stable operation in electric vehicles (EVs) application is proposed. To obtain the stability of such a system, both motors should always be respect the synchronism even if they have different load torque. The proposed control method is based...
Due to the current constraint of linear induction machine (LIM) and voltage constraint of inverter, the output thrust of LIM is limited. So, in order to make LIM output thrust as large as possible within current and voltage limit, firstly, the maximum thrust per ampere (MTPA) is used to achieve maximum thrust with limited current in low speed. Secondly, with the speed of LIM increasing, the voltage...
The open-ended winding configuration allows feeding an electric motor from two sides. If one of them is connected to an inverter closed on a floating capacitor, operating as an active power filter, it is possible to obtain several benefits over the traditional configuration, such as an extended field weakening speed range and a lower current ripple. However, the additional converter causes switching...
In this paper, we investigate the variation in characteristics of variable speed induction motors fed by inverters with grades of core materials used for stators and rotors from both results of measurement and finite element analysis. Identical shaped stator/rotor cores are manufactured by using several kinds of electrical steel sheets from low to high grades. Then, the characteristics of these motors...
This work investigates maximum efficiency control strategies of permanent magnet (PM) traction machine drives that are adopted in General Motors (GM) hybrid and electric vehicles. First, three different current vector control techniques, Maximum Torque Per Ampere (MTPA), Maximum Torque Per Motor Loss (MTPML), and Maximum Torque Per System Loss (MTPSL), are presented to identify the most attractive...
In this paper a prototype brushless doubly-fed reluctance machine is investigated which is aimed a meeting commercial machine performance figures. The machine has 4 and 8 pole 3-phase stator windings and a 6 pole radially-laminated ducted rotor. The machine is investigated using finite element analysis (FEA), static torque tests with DC current excitation, a MATLAB/Simulink model, and experimentally...
Permanent Magnet Synchronous Machine (PMSM) torque control over a wide speed range is essentially an optimization problem that treats torque error minimization as the objective function with inverter voltage and current as constraints. It is usually time consuming and difficult to solve such optimization problem for closed-form solutions since torque, voltage and current equations are all non-linear...
Steady-state motor efficiency control has been shown to provide significant motor loss savings and efficiency improvement. Including adjustable speed drive inverter losses into the steady-state motor control optimization is also of interest. What is shown here is the effect that these two efficiency improvement schemes have on the distribution of losses between the motor and the inverter when an efficiency...
Flux-Weakening (F-W) based on feedback voltage regulation is commonly adopted in Interior Permanent Magnet Synchronous Motor (IPMSM) drive systems. Voltage vector magnitude is controlled in closed-loop by modifying the current reference space vector, following a reference value related to the inverter limitations. Stable and fast voltage control allows to operate with lower voltage margin, which leads...
This paper proposes a capacitor-less inverter for AC motor driving system. The proposed converter consists of a single-phase diode rectifier, a small film capacitor at the DC bus, a three-phase voltage-source inverter, and a permanent magnet synchronous motor (PMSM). Since the DC bus capacitor is quite small, the input current of the AC source will be affected directly by the three-phase inverter...
This paper first shows efficiency maps of electric power train based on a two battery High Efficiency Energy Conversion System (HEECS) chopper. HEECS is based on the principle of partial power conversion, and the overall efficiency of HEECS chopper is high and over 99% [1]. The efficiency of this power train was measured in states of constant speed and constant torque by the motor test bench. Second...
A new scheme for Direct Torque Control (DTC) of dual inverter fed Induction Motor (IM) with open end stator winding is presented in this paper. This scheme eliminates common mode voltage from the windings there by facilitating both inverters to draw power from a common DC source without circulation of common mode currents though the windings and switches. A major advantage of this DTC scheme is the...
Two control strategies, a finite-state predictive torque control and a linear control with space-vector PWM, are developed and experimentally assessed in this paper. Both strategies are used to control a permanent magnet synchronous motor supplied by a three-level neutral-point-clamped inverter. The high complexity of the drive system and the different nature of the control objectives make the development...
Finite control set model predictive control (FCS-MPC) has become very popular form of predictive control among the technical society. Thank to its flexibility and well understood and simple structure, it is well suited for control of ac drives. It represents very interesting alternative for conventional control schemes based on cascade structures with PI controllers. The substantial advantage of MPC...
The paper presents the natural extension DTC principle of three level diode clamped voltage inverter fed induction motor. This technique is based on a simple algorithm using look-up table for a three-level inverter established from a standard two-level inverter. The control algorithm is implemented using Field Programmable Gate Arrays (FPGA) with VHDL coding.
On the basis of establishing mathematical model of induction machine, the simplifying assumption of two-dimensional plane finite element model was proposed, and Dirichlet and main boundary conditions were defined. The speed governing of induction machine was realized using back-to-back voltage-fed frequency converter. The continuous output direct voltage value of three-phase non-controlled rectifier...
The common-mode voltage (CMV) could cause severe hazards to the induction machine winding insulation and bearings, reducing the machine lifetime. This paper proposes an improved predictive torque control (PTC) method with CMV reduction strategy which cost little and much smaller than traditional filter method. A simulation based on SIMULINK is analyzed which verify the effectiveness of the proposed...
Model predictive control (MPC) has recently emerged as a powerful control method for ac motor drives, featuring quick dynamic response and intuitive concept. However, conventional MPC requires lots of calculation resources due to the enumeration of each possible voltage vector, especially in the case of a multilevel converter. To achieve good performance with low switching frequency for high power...
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