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The current control is used in many fields especially in AC motor control because the current control loop is the inner loop of the three-closed-loop structure. Aiming at the simple and robust current control technique-HCC (hysteresis current control), the paper introduces the principle. Based on the literature, simulation model of HCC applied in AC motor vector control is given. The relationship...
To calculate the temperature of 31kW submersible motor of YQY114P-2Series, established the three-dimensional mathematical model of stator and rotor considering that the temperature of the lubricate oil is changing. To got the temperature distribution in map through calculating the couple field of temperature field and fluid field by the method of Finite Element Method. And also we make the comparison...
The Control of high power density asynchronous motor (HPDAM) has received more attentions urgently by motion control experts. This paper discusses a drive method used to a kind of special high power density asynchronous motor which power density is more than 1.6 kW/kg. The motor nonlinear magnetic circuit model based on stator flux orient is analyzed. A stator-flux oriented senseless slip frequency...
Present methods used in stator wingding fault diagnosis have many disadvantages, such as instability, complex calculation. To solve the problems, positive and negative separation method is applied in stator winding fault diagnosis. Firstly, acquired data passes low-pass filter to weaken the influence of high-harmonics and yawp, then it applies positive and negative separation method to extract fault...
Three passive magnetic bearings developed by the authors have been applied to the impeller blood pumps. The measuring system with hall sensors is built for determination of the maximal rotor eccentric distances in the pumps. The results show that when the rotating speed exceeds 4000rpm and the mass flow rate exceed 4 L/min, magnetic levitations can be achieved in the rotor with I-type bearing because...
Multi-segment Primary Permanent Magnet Linear Synchronous Motor (MP-PMLSM) drives is investigated in this study for vertical linear transportation applications such as a ropeless elevator. The optimization model of MP-PMLSM is established for various considerations of force ripple, driving force, weight and cost. Single primary unit length and the number of primary units are newly chosen as important...
Since there's a biggish output ripple in current direct torque's control, we design a direct torque control system for three-level inverters used in asynchronous motors by analyzing the operational principle of the diode clamped three-level inverters, and simulation is done as well. Ripples of the torque and the rotational speed of the motor can be deduced effectively, and a stable output and a good...
Radial magnetic force acts on the motor stator cause large vibration and acoustic noise, that have limit the application of switched reluctance motors (SRMs). They can be aggravated when there is unbalanced force due to rotor eccentricity. This paper analyzed the function of bearingless technique in compensating the unbalanced magnetic attraction force; Then the stator radial force mathematic model...
Short stator single-side linear induction motors (SLIM) which are applied in the propulsion of transit vehicles are widely used in recent years. The SLIM is capable of adhesion independent braking and acceleration levels which ensures safe, fast running. This paper presents a novel slip frequency control scheme with feed-forward compensation for SLIM. Experimental results for the control scheme from...
The vector control strategy for double-fed induction motor fed by back-to-Back dual three-level converter was studied in this paper. The accurate observer and effective control of the stator flux for double-fed induction motor has significant sense to the performance improvement of vector control system. In the thesis, two one-stage low-pass filters are adopted instead of the pure integrator in the...
To solve the problems of large flux and torque ripples and inconstant switching frequency in direct torque control (DTC) for permanent magnet synchronous motors (PMSM) and to eliminate speed sensor since it deteriorates system reliability and increases the cost of system, a novel speed sensorless DTC method based on space vector modulation (SVM) is proposed in this paper. This method is based on the...
The control strategy which the direct self-control was proposed to brushless DC motor system achieved the high performance with its simple structure and the torque control was the center. However, at lower speed, the distortion of stator flux-linkage waveform made the operating performance of brushless DC motor lower as the impact of stator resistance voltage drop. Thus, a new approach was brought...
This paper presents a novel configuration of the permanent magnet system for rotating magnetic refrigerator, which consists of stator and rotor. The stator of this system includes two permanent magnets and iron yoke. The rotor includes shaft, iron core and magnetic refrigerant material. When the magnetic refrigerant material is located under the pole of the permanent magnet, it is magnetized by a...
An inverse control method for the chaos motion of the salient permanent magnet synchronous motors (PMSM) is proposed. Firstly, the model of PMSM in the rotor-field-oriented frame is transformed into the non-dimensional form via the multiple-time-scale transformation. Then, the chaos behaviors of the salient PMSM are analyzed by using phase portraits and bifurcation diagrams. On the basis of the invertibility...
The accurate observer and effective control of the stator flux for electrically excited synchronous motor, has a significant sense to the performance improvement of direct torque control system. For this, a novel full-order closed-loop stator flux estimator suitable for full speed range was put forward and analyzed detailed in this paper, it pointed out that the estimator was composed of two estimator...
An adaptive flux observer is designed for a speed sensorless DTC controlled induction motor drive in which the stator resistance value is updated during operation and a new speed-adaptive law is given. By using robust control theory, the constant observer gain is obtained by solving two bilinear matrix inequalities. The stability of the flux observer is ensured in a sufficiently large symmetric interval...
A direct torque control strategy for dual three-phase permanent magnet synchronous motors is presented in this paper. The motor has two sets of three-phase stator windings spatially phase shifted by 30 electrical degrees. In order to reduce the harmonic current in stator windings which has no contribution to torque production, torque and flux are controlled based on regulators and three-phase decomposition...
This paper analyzes the Direct Torque Control (DTC) theory. We find that dynamical and stable performance are not hold with traditional voltage switch strategy at the same time. It presents a new direct torque control method of brushless DC motor, and introduces a space voltage vector selection table. By the addition of zero vector in the converter control, traditional three order torque control loop...
This paper proposes the application of model predictive control (MPC) to reduce torque ripple for brushless DC motors (BLDCM). The equivalent structure of BLDCM with stator current predictive control is built. In predictive control, the error between the output of BLDCM and predictive model is used to design feedback adjustment and rolling optimization controller. Compared to traditional proportional...
This paper deals with a practical sensorless control method for doubly-fed-induction-generator based wind power generation systems. The speed estimator is based on a novel control scheme called active disturbance rejection control. Encouraging simulation results have been obtained.
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