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In order to improve the system efficiency and the battery life of electric vehicle in low speed condition, the maximum torque per ampere(MTPA) control strategy is used in vector control system of induction motor. The MTPA is a kind of variable excitation control strategy essentially, which worsens the torque dynamic performance seriously because of the existence of rotor time constant. In this paper,...
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...
In order to analyze the loss of Line Start permanent magnet (LSPM) motor, the loss calculation model, which is based on field-circuit-motion coupled Time-Stepping Finite Element Method (T-S FEM), are established in this paper. Taking a 22kW LSPM motor as an example, the iron losses and rotor copper loss are calculated under different supply voltage and load conditions. It is found that, under no-load...
This paper presents an improved speed sensorless vector control method for induction motors used in the field of electrical vehicle propulsion. The proposed method is based on the d-q axis dynamic model of the induction motor and an improved closed-loop flux observer, which can achieve precise rotor and stator flux estimation over a wide speed range. And then, a rotor-speed-estimation method, based...
This paper presents an improved speed sensorless vector control method for general-purpose induction motors (IMs). The proposed method is based on the d-q axis dynamic model of the induction motor and an improved closed-loop flux observer, which can achieve precise rotor and stator flux estimation over a wide speed range. And then, a rotor-speed-estimation method, based on fuzzy control theory, is...
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