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To meet demands for ever greater efficiency and torque-density, the design of electric machinery through optimization techniques is increasingly common. Such approaches may involve the evaluation of millions of candidate designs and therefore their rapid assessment is paramount. Such emphasis on computational performance is problematic for modern machine design in which many cutting-edge topologies...
Research on multiphase drives has been intense during the last years. The first topologies considered the use of a number of phases multiple of three, being the most studied the asymmetrical double three-phase machine with independent neutral points supplied by a VSI (Voltage Source Inverter). Due to the discrete quantity of VSI outputs, Pulse Width Modulation (PWM) techniques are used to generate...
This paper proposes a new time-domain method to detect all four major types of induction machine faults without added sensing or model information other than that needed for closed-loop regulatory control. The proposed method applies artificial modulating signals, which are self-adapting to contain the estimated fault frequencies based on the real-time machine speed and torque, to the stator current...
Conventional Maximum Torque-Per-Ampere (MTPA) control was derived from the three-phase induction machine model ignoring iron loss. A new MTPA control is proposed in this digest, whose accuracy is improved by considering machine iron loss using a newly published induction machine iron-loss model. The detailed derivation of the proposed MTPA control and possible enhancement of torque-per-ampere capability...
This paper proposes a framework for the design of a coreless permanent magnet (PM) machine for a 100 kWh shaft-less high strength steel flywheel energy storage system (SHFES). The PM motor/generator is designed to meet the required specs in terms of torque-speed and power-speed characteristics given by the application. The design challenges of a motor/generator for this architecture include: the poor...
Asymmetric half bridge (AHB) converter provides flexibility in the control of switched reluctance machine (SRM). However, because of the non-standard structure of the AHB converter, limited volume production leads to high cost of the driving system. Delta-connected SRM with series diodes driven by three phase full-bridge inverter was proposed as an alternative by the researchers. However, the conduction...
An analytical method of inductance calculation for the two-layer spoke-type ferrite interior permanent magnet (IPM) machines is developed based on the equivalent magnetic circuit theory in d-q frame. FEA models are built to verify against the analytical method, and excellent agreement is achieved. Based on the verified inductance calculation, further studies on the influence of various design parameters...
The strong leakage magnetic flux in the end region of large synchronous generators results in significant eddy currents in the end components which can possibly lead to overheating thus threatening the safe operation of large generators and is an essential issue at the design stage. The press plate is a major end component of large generators that fastens the stator end-core packets and shields the...
This paper presents design study on windage loss reduction for hybrid excitation flux switching motor employing two types of rotor structure. Conventional flux switching motors have a rotor structure with salient poles, by which windage loss at high speed region becomes serious. To reduce the windage loss, two types rotor are built: One is a cylindrical rotor employing iron rib between adjacent salient...
This paper proposes a new category of electric motors able to generate high torque with reduced volume, i.e., high torque density. Such a new design is denominated as an airgapless electrical motor since the rotor touches the stator as it spins. Due to its zero airgap, the proposed motor will maximize the generated torque, allowing such type of motors to be competitive in applications where hydraulic...
Pulse Width Modulation (PWM) techniques are used in power converters to generate variable voltages (amplitude and frequency) for various purposes. One of them is for inverter fed multiphase drives, and among them the asymmetrical dual three-phase machine. In this paper, a set of SVPWM (Space Vector PWM) techniques is introduced for 6-phase converters feeding double three-phase independent machine...
Motor using magnetic levitation has advantage that contamination due to abrasion powder and lubricating oil does not occur. But it is difficult to apply to applications requiring high torque, since it cannot use a mechanical reducer such as gears. Therefore, in this research, we focus on the vernier motor structurally suitable for high torque drive, and propose a bearingless vernier motor for low...
This paper presents the optimization of center post and rib length of a high speed permanent magnet assisted synchronous reluctance motor (PMa-SynRM) through the modeling of performance parameters. With low torque ripple, wider field weakening region and cost effective structure, PMa-SynRM can be a deserving candidate for high speed machine design. One of the most crucial factors for PMa-SynRM operating...
Bearingless motors (BelMs), which can realize magnetic levitation rotation with no mechanical contact, have been proposed and developed. In general, in high speed and high output BelMs, distributed winding structure is adopted in order to suppress iron loss, and neodymium sintered permanent magnet (Nd sintered PM) is employed to achieve a high power density. However, output power fall is caused due...
In this paper, a nonlinear analytical model based on the Magnetic Equivalent Circuit (MEC) method is developed for a double-sided E-Core Transverse Flux Machine (TFM). The proposed TFM has a cylindrical rotor, sandwiched between E-core stators on both sides. Ferrite magnets are used in the rotor with flux concentrating design to attain high airgap flux density, better magnet utilization, and higher...
The torque transient behavior during winding reconfiguration of a brushless motor is investigated in order to suppress torque interruptions or jolts. This reconfiguration changes the intrinsic torque-speed characteristic of the motor. A simpler approach using the alternation on and off (block commutation) of phase currents as well as an adaptation of the current amplitude depending on the transient...
Advancing the turn-off angle of the phase current of brushless direct current (BLDC) motors is a common control practice to improve their behavior and efficiency (reduction of current peaks, copper losses, and breaking torques). This paper investigates a refined switching strategy for a single-phase BLDC motor with bifilar winding to increase the energy conversion efficiency of the system. In addition...
Control scheme based on variable mode model predictive control is proposed in this paper. By augmenting the conventional model predictive controller with a variable cutoff-frequency/order, an additional degree of the objective function allows for optimal tradeoff between the thermal stress reduction and the harmonic performance. Both the simulation and experimental results have validated the effectiveness...
This paper describes a flux linkage maps identification method for AC synchronous motors under thermal quasi-steady state operating conditions, corresponding to a specified machine rms current. This method applies to any synchronous machine, including Permanent Magnet (PM), wound field and synchronous reluctance machines. If the machine uses permanent magnets, then the proposed method allows the comparison...
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