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This paper proposes a halt sequence for a matrix converter to overcome the overvoltage and overcurrent problems in the case of grid faults in regeneration. The proposed halt sequence short-circuits PMSM to avoid the regenerating current which flows into the snubber capacitor. The proposed method consists of two sequences; Sequence I controls the q-axis current to reach zero and PMSM becomes in the...
In this paper, the open-loop control for permanent magnet synchronous motor (PMSM) driven by a square-wave voltage is proposed. The proposed control is able to transit from the PWM region to the square-wave voltage region via the over modulation region seamlessly. When the PMSM is driven by the square-wave voltage using the proposed control, the low-frequency torque vibration except 6th or 12th order...
This paper discusses an evaluation method of electric energy consumption of a permanent magnet synchronous motor (PMSM) drive system. The calculation method of the energy consumption based on an efficiency map is proposed. First, it is confirmed that the error ratio between the calculation result and the measurement result is less than 5%. In addition, the energy consumption of the PMSM drive system...
This paper discusses a direct grid connection system for the permanent magnet synchronous motor (PMSM). It is difficult to connect PMSM to the power grid directly due to the resonance between a synchronous reactance and the inertia moment. In order to solve this problem, the direct grid connection system which consists of an auxiliary inverter of small capacity and a matrix converter is proposed for...
This paper proposes a simple magnetic equivalent circuit using permeance method in order to design rough configurations of the lowest loss motor. First, the iron loss is calculated by the proposed method and compared with the analysis result by finite element method (FEM). As a result, the error of the calculation results between the proposed method and the FEM is 2.9%. Next, the motor losses are...
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