The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
For the recently presented "Stator Cage Machine" an analytical calculation method is developed. First of all the magneto-motive force produced by the stator is analyzed and a definition for the number of phases of such machines is given. Following, parameters of the machine (resistance, inductivity and flux linkage) and the generated torque are calculated. As the machine does not contain...
For the control strategy of cascaded multilevel converter based solid state transformer (SST), in order to solve the power unbalanced problem caused by mismatch of the parameters of each dual active bridge (DAB) module, power balance control strategy is proposed. This strategy uses the active power component of the duty cycle of each module of the multilevel rectifier as power feedback to adjust the...
Due to the particular structure of single-sided linear induction motors (SLIMs), e.g. cut-open magnetic circuit, difference between primary and secondary width, they suffer heavily from longitudinal end-effect and transversal edge-effect. Consequently the secondary flux linkage, secondary resistance and thrust are deteriorated, which would increase the copper loss, thrust ripple, and decrease the...
To solve the velocity-measurement difficult problem of linear motor in high speed and high acceleration occasions, a velocity-measurement method based on teeth-slots signals detection is proposed in this paper. In this method, the speed signal is obtained from the inductance periodic variation of probe coil, and the "teeth-slots" bar consisting of conductor and ferromagnetic materials alternating...
Multiple coupled circuit modeling (MCCM) of squirrel-cage induction motors (SCIMs) uses winding function or modified winding function theory to simulate performance of healthy and faulty SCIMs. This paper applies MCCM to simulate SCIMs with rolling-element bearing localized faults. This is done by defining appropriate instantaneous air gap functions. Simulation results show specific frequency components...
The authors have proposed a new suppression method of the 6th-order torque ripple of permanent magnet synchronous motors (PMSMs). The proposed method can estimate the harmonic components in the flux-linkage which is the cause of 6th-order torque ripple. And, the proposed method does not use a torque meter, and estimate the harmonic components by mainly using current sensors of the inverter. By simulation...
The paper presents the design aspects of Inner Mounted Permanent Magnet (IPM) Synchronous Wind Generator. The design concepts and performance analyses have been done with traditional formula and finite element analysis (FEA) [1]-[5]. For electrical performance verification, no-load and full-load voltage, d- and q-axis reactance, voltage regulation ratio, demagnetizing condition, loss and efficiency,...
Magnetically-coupled resonant wireless power transfer (MCR-WPT) has been a research focus in recent years. Multiple transmitters are employed to improve efficiency in a wide area. In this paper, the MCR-WPT system with two transmitters supplied by the same source is modeled and its equivalent circuit is depicted. The mutual inductance between the two transmitters is considered. Proper connection of...
This paper presents a comparative study of constant power speed range of permanent magnet brushless (PMBL) machines with different d-axis inductance for electric vehicles (EVs). According to the flux weakening principle, three typical operation cases, namely, characteristic current is higher, lower than and equals current limitation, are given and analyzed in details. By the finite element analysis...
A novel sensorless control method of Switched Reluctance Motor (SRM) based on crossing point of transformer electromotive force (EMF) and motional back electromotive force (BEMF) is proposed in this paper. The crossing point position can be derivate from inductance mode, and it is regarded as a reference point to estimate rotor position. The rotor position can be estimated by detection of the special...
The phase inductance character of permanent magnet synchronous motor (PMSM) is closely related to its saliency, which has significantly influence on the position estimation using high frequency signal injection at low speed. In this paper, the relationship between phase inductance harmonics and position estimation error is discussed with qualitative and quantitative analysis, which is helpful for...
Contactless power transfer (CPT) system is widely used in high power occasion recently. The characteristics of movable loosely coupled transformer (MLCT) in CPT system have powerful influences to the performance of whole system. This paper studies a kind of CPT system with multi-primary multi-secondary contactless transformer. By establishing the equivalent circuit of CPT system, this paper analysis...
Switched Reluctance Motors (SRMs) have some advantages such as simple and robust structure, low manufacturing cost, and so on. Moreover, SRMs can drive in high speed region and high temperature condition. These advantages are suited for the automobile auxiliary motors. However, in SRMs driven by voltage single pulse drive, it is difficult to achieve the demanded performances such as torque and efficiency...
Energy router is defined and developed along with the new concept of energy internet. This paper presents an AC-DC hybrid multi-port energy router for power distribution networks, which consists of high voltage AC port, low voltage AC port and low voltage DC port. Based on the description of its circuit topology and control strategy, the design of the main parameters is analyzed in details. The relationship...
The dead-time, the load degree, or the resonate inductance and capacitance all would affect the phase-shifted full-bridge PWM converter to implement ZVS. In this paper, emphasize research on the influence of the dead-time. Analyse the switch process of the different dead-time, the formula of the optimal dead-time, and the experiment results are also given.
When direct torque control (DTC) is applied to permanent magnet synchronous motor (PMSM) drives, the relationship between the torque and stator flux linkage is important for high-efficiency drives because DTC requires them as references. In the stator flux linkage synchronous frame (M-T frame), the torque equation is described as a simple equation using the T-axis current. However, the M-axis current...
Applications using dielectric electro-active polymers (DE-EAP) tend to grow quickly due to their most interesting feature: when activated, displacements can reach ranges as high as 200–300%. How interesting this may be, the voltage to be applied is very high — 5 kV — and therefore difficult to handle and manage. Inductive contactless power transfer (ICPT) systems are elegant solutions to completely...
This paper proposes a new approach to achieve on-line identification of the q-axis inductance and the resistance of the interior permanent magnet synchronous motor (IPMSM) on the basis of the relationship between the mismatch of Lq and the d-axis feedback current. The value of the d-axis feedback current depends on the mismatch of Lq, and the consecutive samplings of the d-axis feedback current make...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.