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.
This paper proposes a novel flux-reversal hybrid magnet memory machine (FR-HMMM), which is geometrically characterized by consequent-pole hybrid magnets mounted on the stator poles. The low-coercive-force (LCF) permanent magnets (PMs) are alternately placed between the adjacent stator slots, while the rare-earth NdFeB PMs are located on the center of stator pole. Due to the consequent pole configuration,...
In the industrial field, the drive system integrated the high speed motor and the gear is required to effectively utilize the limited space. However, mechanical gears often require their lubrication and cooling, they generate whilst noise and vibration. To overcome these problems, the magnetic gears have been expected. Magnetic gears achieve the system with maintenance-free, low noise and low vibration...
Vernier permanent magnet synchronous machine (VPMSM) is a promising candidate for low speed direct-drive applications. At the design stage of VPMSMs, one of the key issues is the selection of the slot/pole number combination. This paper will show that a proper selection of the slot/pole number combination can be achieved based on an index parameter of VPMSMs: the gear ratio. Firstly, the magnetic...
This paper presents analysis of cogging torque and torque ripple according to unevenly magnetized magnet patterns in permanent magnet synchronous motor. In previous studies it has confirmed that non-uniformly magnetized permanent magnet causes unexpected increase of cogging torque and torque ripple because of slot harmonic components. However, these studies investigated insufficient number of irregular...
This paper proposes a distributed speed control with improved power sharing capability for multi-three phase synchronous machines. This control technique allows the speed to be precisely regulated during power sharing transients among different drives. The proposed regulator is able to control the time constant of the current within the dq0 reference frame to a step input variation. If compared to...
Surface-mounted permanent magnet (SPM) machine is widely applied in industry application because of its high torque density, high efficiency and simple rotor structure. This study presents a parametric design plane, which makes the desired machine performance visualized during the machine design process. Based on that, a new parametric design method is introduced to simplify the design procedure of...
This paper proposes a improved hill climbing searching (HCS) maximum power point tracking (MPPT) control strategy for the dual power flow (DPF) wind energy conversion system (WECS) which is based on the electrical variable transmission (EVT). The proposed improved HCS MPPT strategy is developed based on the electrical power which is generated by the stator. The peak detection capability has been devised...
Flux-Weakening (F-W) based on feedback voltage regulation is commonly adopted in Interior Permanent Magnet Synchronous Motor (IPMSM) drive systems. Voltage vector magnitude is controlled in closed-loop by modifying the current reference space vector, following a reference value related to the inverter limitations. Stable and fast voltage control allows to operate with lower voltage margin, which leads...
In this paper, the stator/rotor pole combinations in variable flux reluctance machines (VFRMs) are investigated from the prospect of magnetic gearing effect. Firstly, the magnetic gearing effect in the torque production of VFRMs is revealed from an analytical model. Based on this, the principles of feasible stator/rotor pole selection and corresponding winding configuration are analyzed. Then, the...
Referring to a 4-wheel drive Formula Student Electric vehicle, a fractional-slot synchronous permanent magnet machine has been designed. Torque density has been improved adopting outer rotor topology and lightweight materials. An ironless rotor with PMs placed in an Halbach array configuration allows reduced rotor inertia to be obtained. The results described in the paper provide a quantitative assessment...
The demand for increased power and improved fuel economy are driving changes in alternator technology for automotive applications. To meet these demands requires a machine with capabilities of torque assist, regenerative braking, and power generation to supply vehicle loads while keeping the battery charged. Furthermore, to minimize add-on cost, the system must be air-cooled and operate at 12V with...
Since the vernier machine (VM) is a flux modulation machine that also operates simultaneously as a synchronous machine, the torque producing mechanism of this device is difficult to understand. This paper begins with an analytical study of a synchronous permanent magnet (PM) machine, where the back-emf and torque are derived based on a generic number of slots per pole per phase stator. Numerical comparison...
With the advantages of small size, light weight and more compact construction, brushless DC motor (BLDCM) has been widely applied to the field of industry. Centrifugal compressor converts the kinetic energy of the air into pressure, and it can be used to provide air to the full cell. The drive and control strategy of BLDCM not only affect the characteristics of centrifugal compressor, but also has...
This paper proposes a capacitor-less inverter for AC motor driving system. The proposed converter consists of a single-phase diode rectifier, a small film capacitor at the DC bus, a three-phase voltage-source inverter, and a permanent magnet synchronous motor (PMSM). Since the DC bus capacitor is quite small, the input current of the AC source will be affected directly by the three-phase inverter...
This paper deals with the self-commissioning of synchronous reluctance motors. Previous work has demonstrated that the motor flux maps can be accurately identified at standstill by exciting the machine with square-wave voltage pulses of large amplitude, of the same order of the machine nominal voltage. This was made without the need of rotor locking and without using position sensors. The knowledge...
Variable flux permanent magnet synchronous machines (VF-PMSMs) have recently been proposed to reduce driving cycle losses in electric vehicle traction motors via magnetization state (MS) manipulation. This paper presents a closed-loop magnetization state (MS) control method to enable reliable loss minimization control of VF-PMSMs. The MS is estimated at every sample instant and is used as feedback...
Maximum Torque Per Ampere (MTPA) tracking techniques for the control of Interior Permanent Magnet Synchronous Machines (IPMSMs) and Synchronous Reluctance Machine (SynRMs) drives were introduced in the last decade, with the aim of overcoming the dependence on motor parameter knowledge accuracy. In fact, uncertainty due to identification errors, magnetic saturation or temperature variation results...
This paper proposes a new family of electric motors based on the concept of an airgap-less device with an internal rotor. The internal flux and therefore electromagnetic torque is maximized because the rotor is allowed to touch the stator. The proposed family of motors are competitive in applications where hydraulic motors are prevalent, i.e., low-speed and high-torque requirements. Furthermore, the...
As a promising candidate in direct drive application, Vernier permanent magnet synchronous machines (VPMSMs) feature high torque density due to magnetic gearing effect. This paper reveals the nature of magnetic gearing effect in VPMSMs in depth. Firstly, the general torque production mechanism of Vernier permanent magnet synchronous machines (VPMSMs) with surface mounted PMs are investigated based...
A magnetically geared machine (MGM) integrates a magnetic gear with a low torque, high speed electric machine to create a single compact high torque, low speed device with the size advantages of a mechanically geared system and the reliability of a direct drive machine. This work investigates the use of MGMs for wave energy conversion through the development of a large scale magnetically decoupled...
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.