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Field oriented control doesn't correspond to features of synchronous motor as good as it does to induction motor. Special control algorithm is proposed to provide operation, suitable for mass high-power drives. The solution is implemented and tested in two fan drives, 3.15 MW each, now in operation at a diamond mine in North-East Siberia.
This paper presents a signal injection method without torque variation for the position sensorless control. Proposed method utilizes the maximum torque control frame that makes torque ripple caused by a signal injection minimized. It is proved from the definition of the maximum torque control frame and evaluated by experimental results.
A special permanent magnet synchronous motor for ship propulsion in the power range between 50 and 250 kW is presented. It is fed by a PWM-voltage source inverter with field oriented control. A motor feature is the very low stator inductance. It leads to low reactive power and high maximum torque, but on the other hand it produces large current ripples and therefore harmonic losses up to 10 % of the...
A motor control system driven by multiple distributed inverters has been proposed until now to improve the robustness and the fail-operational control performance of motor drivers just after some of the inverters break down. Its failure characteristics are examined and analyzed by some experiments using a permanent magnet synchronous motor (PMSM) with eight poles and twelve windings. The proposed...
High torque low speed direct drive permanent magnetic synchronous machines (PMSM) powered by variable speed drives are increasingly used in applications traditionally reserved for standard induction motors with gear-boxes. Our application experience shows that in such motors resonant frequency of the common mode current path can have unusually low value (comparable with the inverter switching frequency)...
The paper deals with the design of a 1000 HP Permanent Magnet synchronous motor for the propulsion of a 670 tons ship. The paper contains the preliminary design evaluation to define motor specifications and rotor configuration and a description of the main steps of the electromagnetic design and thermal analysis. Prediction of motor performance and preliminary test results are also presented and discussed.
The main purpose of this paper is to minimize the loss while reducing the flux and torque ripples in permanent magnet synchronous motors (PMSMs) under direct torque control (DTC). Offline method is used to minimize the loss and obtain the optimal flux. To reduce the amount of computation, the optimal flux table is produced according to the conditions in which the machine works. To reduce the flux...
Challenges and proven solutions dedicated to the field oriented vector control (FOVC) of magnetically saturated permanent magnets synchronous motors (PMSM) are discussed in this paper. It has been noticed that in case a PMSM operating in magnetic saturation the feedback currents in the d- q-reference frame oscillate at six times the electrical frequency. The oscillation mechanism has been analyzed...
Recent progress in power electronics has opened a new area in power conversion and has enabled to design high-performance medium voltage PWM converters. Such converters have allowed the use of induction motors in electric propulsion systems bringing many advantages in terms of robustness and efficiency. In the recent years, there is a huge demand by ship owners and ship yard operators for electric...
This paper deals with the analytical design of an axial flux permanent magnet (AFPM) in-wheel synchronous motor for electric vehicles (EVs). AFPM motor is a pancake-type high torque density motor that fits perfectly the wheel of an automobile vehicle and that can, thus, be easily and compactly integrated into the wheel. Therefore, AFPM motor seems to be a better choice than radial flux permanent magnet...
This paper presents and analyzed short circuit failures for permanent magnet synchronous motor (PMSM). The study includes stated state and dynamic condition for experimental test. The stator current is analyzed by means of Zhao-Atlas-Marks distribution (ZAMD) and energy spectrum.
This paper proposes a novel method of maximum power operation for permanent magnet synchronous motors in a direct torque control system. Torque limiting satisfying current limiting is based on the power equation instead of the motor model in the rotating d-q frame, which is synchronized to the rotor magnet. This method of torque limiting does not require the motor parameters to be determined and simplifies...
In this paper, torque control scheme for PMSM when an inverter operates in the overmodulation range is proposed and examined. The torque control system has our proposed closed-loop current control system, which harmonic current compensation scheme is used to improve the stability in the overmodulation range. Finally, the overall torque control performance will be evaluated by the experimental results.
This paper presents an investigation into design possibility of hybrid excitation motor as less-permanent magnet and high power density for traction drives in Hybrid Electric Vehicles. Firstly, the construction, the basic working principle and the design concept are overviewed. Then, the reason why the proposed machine is suitable for realizing the motor with less-permanent magnet and high power density...
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