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Two fast online Permanent Magnet Synchronous Machine (PMSM) flux estimation methods, reactive power feedback and extended Kalman filter based methods, are analyzed and compared from machine real torque optimization point of view. The analysis has been carried out, firstly, in simulation and afterwards, it has experimentally been validated on a 120kW SPMSM railway traction prototype.
Sensorless motor drives are claimed to be more reliable than their sensored counterparts, as they avoid electromechanical sensors, additional wires and circuitries. However, the assertion is true only in normal operations. In fact, if on one hand the elimination of electromechanical, and electronic devices increases the drive reliability as a small number of parts subjected to possible faults are...
The work described in this paper deals with the analytical design and optimization of a line-start permanent magnet synchronous motor (LSPM) with a series magnetic circuit structure. The design approach considers a LSPM as an induction motor (IM) combined with a permanent magnet rotor arrangement and takes into account the characteristics of both asynchronous and synchronous regimes.
On account of the reverse salient pole characteristic and defects of the traditional parameter identification method, this article put forward a parameter identification method based on particle swarm optimization(PSO) combine with the mathematical model of the motor. And even made an improvement of PSO. The improvement of PSO can identify the four parameters in same time such as the stator resistance,...
The four-leg inverter (4LI) which drives two induction motors have been studied, but the drives of two permanent magnet synchronous motors (PMSMs) fed by a four-leg inverter have not been studied. PMSMs can drive not only speed control but also position control. This paper shows the characteristics of two PMSMs independent drives fed by a 4LI. First, this paper shows the method of 4LI to drive motor...
To reduce energy consumption, we developed a technique that varies the number of magnetic poles in a permanent magnet (PM) motor. We propose a PM motor that can change the number of magnetic poles and produce two types of torque. When the motor operates with 8 poles, it produces a PM torque at low speeds. When the motor changes to 4 poles, it produces both PM torque and reluctance torque at high speeds...
In this paper, the performance improvement of an induction motor of which stator core is made of molded SMC (Soft Magnetic Composite) is presented. By using SMC, 3D shaped core is easily constructed. The teeth of the stator core extended in order to enlarge the pole surface area in the same outer dimension of the motor. In this presentation, the motor performance of the motor using the core made by...
This paper presents a reduction method for a torque ripple resulting from a motor phase current sensor offset error for motor drive applications such as a hybrid electric vehicle (HEV). The proposed method compensates for the detected motor phase current offset error by subtracting the detected motor phase current offset error value indirectly estimated using the inverter offset voltage reference...
The paper presents results of a research on the sensorless drive with PMSM supplied through the sinusoidal filter. The back electromotive force based observer is used to the shaft position estimation. Used in the study, the observer's correction function, contains multi integrators in the path, which improves the position estimation. Otherwise than in a typical implementation of the position observer,...
This paper presents a sensorless and stable control method for a five-phase permanent magnet synchronous motor (PMSM). At first, a model of a five-phase PMSM is presented. After that a stability study has been performed by the analysis of the eigenvalues of the state transition matrix of the linearized PMSM model about an operating point. The results show that the machine speed response is unstable...
This paper proposes the fast initial position estimation of IPMSMs (Interior Permanent Magnet Synchronous Motors), based on intentional pulse voltage injection and comb filters. Generally, the rotor position can be estimated by detecting high-frequency current caused by injected high-frequency voltage because its response includes inductance information due to saliency. In general, sinusoidal current,...
In this paper, an optimal reference stator flux strategy is proposed to improve the drive system efficiency under direct torque control (DTC). A novel low cost interior permanent magnet synchronous machine (IPMSM) is introduced and used. Based on the easily implementable loss model (LM), the controllable electrical losses which consist of copper loss and iron loss have been minimized under optimal...
Interior permanent magnet synchronous motors (IPMSMs) that employ rare-earth permanent magnets (PMs) containing dysprosium (Dy) are used in home appliances, electric vehicles and hybrid electric vehicles. However, it is desirable to reduce the amount of Dy used in such PMs due to its high cost. This study investigates the rotor structure of an IPMSM with a Dy-free rare-earth PM. Flux barrier shapes...
This paper deals with model predictive control of five phase permanent magnet motors. Using motor model, the stator currents are estimated for the following modulation period, and the required voltages are applied to minimize the current errors. A comparison between the proposed algorithm and conventional cascade PI configuration is conducted.
This study is dealt with fault tolerant control of five phase permanent magnet (PM) machines. The main objectives are to increase the output power while eliminating the generated torque ripples. As a new aspect, the effect of available neutral connection is evaluated on the output power and torque ripples.
This paper presents a method for calculating eddy current loss in a permanent magnet (PM) of a surface permanent magnet (SPM) motor based on electric and magnetic networks. First, a reluctance network analysis (RNA) model of the SPM motor and coupling between the RNA model and electric network model are described. To take account of the carrier harmonics caused by PWM switching, input current waveforms...
An incremental predictive current control method of PMSM is presented, where two adjacent prediction models are subtracted to eliminate back EMF items. It is promising to realize the fastest dynamic response while just one parameter of motor, the q-axis inductance, is needed. Parameter stability analysis of the method is carried out in discrete domain. The result shows that the stable range is not...
Although motors that use rare-earth permanent magnets typically exhibit high performance, high costs and concerns about the stability of raw material supplies can limit production. This paper proposes a permanent-magnet-assisted synchronous reluctance motor (PMASynRM) with ferrite magnets that do not use rare earth materials. The performance of the proposed PMASynRM is evaluated based on the 2-D finite...
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