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This paper proposes a method for independent drive of two permanent magnet synchronous motors (PMSMs) fed by a single five-leg inverter (5LI) based on reducing peak current of common leg. The advantages of 5LI are reduced size, volume, reduced number of devices, and increased efficiency due to total lower losses. The conventional method that has been used for controlling two PMSMs sends a large amount...
The purpose of this paper is to present the speed-sensorless weighted vector control method of parallel-connected dual induction motors fed by a single inverter. In this paper, the flux linkage of dual induction motors is reoriented, and then the control expressions of weighted rotor flux linkage and weighted torque of dual motors are derived. The weight value of vector control for dual induction...
This paper first develops a modified control loop to realize flux-weakening in PMSMs. For a given load torque, the modified control loop ensures the maximum speed of the PMSM is always reached at the optimized path. Next, a benchmark test system based on the co-simulation of Simulink, PSIM and Motor-Solve is developed to obtain a representative simulation of the PMSM traction drive. With the simulated...
In order to implement the speed regulation in a wide constant power range for induction motor of electric vehicle, a wide speed field weakening control scheme based on maximum torque control is proposed. The proposed scheme allows the motor to exploit the maximum torque capability in the wide speed range with the constraints of voltage and current of the motor, and then the distribution strategy of...
To assure the stability performance of the speed estimation in the speed sensorless induction motor drives, the design strategy of feedback gain matrix for an adaptive full-order observer is a necessary issue. In this paper, the major cause of instability phenomenon based on adaptive full-order observer is analyzed, and a novel design of observer's feedback gain matrix is proposed to achieve the stability...
A speed and flux estimation method of induction motors using fuzzy extended kalman filter(FEKF) is proposed in this paper, which is used to make lower impact of time varied statistic of measurement noise. It reaches a better speed estimation accuracy of induction motors than the extended kalman filter(EKF). The proposed algorithm modifies the measurement noise covariance of extended kalman filter...
The research on variable frequency system mainly focuses on the developing of system performance, while the negative effects of the system is ignored. The bearing currents issue is a typical negative effect. In this paper, a lumped common mode model of a variable frequency induction motor driven by PWM inverter is proposed and the formulas of the key parameters in the model are presented and impedance...
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