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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.
In this paper, induction motor of which stator core is made of iron powder (Soft Magnetic Composite: SMC) is presented. The comparison of the performance of SMC induction motor and conventional laminated induction motor is shown. As the result, efficiency difference between SMC motor and conventional laminated motor is only 3.7% in spite of the permeability of SMC is 20% lower than conventional laminated...
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...
Actual market of medium-voltage inverter for industrial applications: 1. Voltage Source Inverters cover a power range up to 30MW with high control dynamic demand IGBT-Modules: for standard applications IGCT/IGBT-semiconductor discs: for applications with high load cycling requirementsSiemens Converter-Portfolio Actual market of medium-voltage inverter for industrial applications:1a.3L-NPC:-suitable...
The aim of this paper is to present the method of sensorless control of super high speed permanent magnet motor. The extended Kalman filter (EKF) is considered as the speed observer and some aspects of using it (including tuning the covariance matrixes) are presented in the paper. The start-up process as well as the steady state is taken into consideration.
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)...
There are several application fields where high power synchronous motor drives are requested to supply high torques at standstill. To this end, the information on the rotor absolute angular position is needed from the first instant of operations. A new procedure to detect the rotor position of synchronous motors without absolute encoder is presented. In particular, an automatic procedure and a simplified...
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.
Electric vehicle (EV) is expected as a solution for protecting the global environment. In EV, safety and design-flexibility can be improved by configuring two or more-wheel drive which uses in-wheel motors. As in-wheel motor, permanent magnet synchronous motor (PMSM) is suitable at the viewpoints of the power density and the efficiency. However, a PMSM requires a three-phase inverter; thus, two-wheel...
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...
This paper presents a starting method of Permanent Magnet Synchronous Motors (PMSM) for constant speed application driven by the commercial three-phase power supply. The starting system has an LC niter and Simplified Matrix Converter (SMC) consisting of four bidirectional switches. The effectiveness of the proposed control method has been verified by experiments.
This paper presents a 1.5-kW, 150,000-r/min PM motor fed by a 12-V power supply, which is applicable to an automotive supercharger. The motor is specially designed to improve its efficiency over 97% (excluding a mechanical loss) and to raise its power density to 13 W/cm3 at the same time. Feasibility of the design is confirmed through experimental tests, using a prototype motor.
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...
The work is intended to explain the basic ideas related to design of sensorless drive with high-speed permanent magnet synchronous machine and vector control system for the oil-drowned pump. The drive and it's control system must allow the pump operating very reliably under heavy conditions. The digital control system has a hierarchy local-distribute structure. The upper level is a ground control...
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...
In this paper, a new algorithm for position and speed estimation in permanent magnet synchronous motors is presented, which is based on the high frequency permanent motor model and on high frequency signal injection, uses an algebraic approach and is aimed to low speed range applications. High frequency injection allows, by means of simple mathematical relationships, the estimation of motor characteristic...
In safety critical applications, fault tolerant controllers are very important. In this paper a generalized fault tolerant digital controller for power electronic applications is presented. Three fixed point digital signal processor (DSP) based controllers are used in parallel, running the same control algorithm. The PWM outputs of three DSPs are voted out to one PWM output using a simple fault tolerant...
This paper proposes a new robust position sensorless control of Interior Permanent Magnet Synchronous Motors(IPMSMs) to inductance variation using the un-known input observer. In position sensorless control of IPMSMs, accurate motor parameters are required for position estimation. However, inductance variation due to magnetic saturation is known to heavily deteriorate performance of sensorless control...
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