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In this paper, vibration reduction of a one-axis actively positioned single-drive bearingless motor with repulsive passive magnetic bearings is presented. The singledrive bearingless motor has only one set of three-phase windings. It generates both torque and axial suspension force independently driven by only one three-phase inverter and one displacement sensor. Therefore, the single-drive bearingless...
This paper outlines a position control system for a two phase linear permanent magnet excited transverse flux machine. A force ripple minimization technique is implemented by an inverse force-current look-up table and a subordinate current controller. The superordinate speed and position control enables positioning tasks. The control system is implemented on a rapid prototyping system and is tested...
This paper investigates the effects of loading on radial magnetic forces in a low-speed PM machine with non-overlapping concentrated windings. Vibration level of the PM machines with concentrated windings can be potentially higher compared to the traditional machines with distributed windings. It is mainly due to the presence of low order harmonics in the spatial distribution of the radial forces...
This paper proposes a new active tension system which is used in coil winding machine for BLDC motor manufacturing. A comparison of winding condition between normal coil such as round shape coil, rectangle shape coil and BLDC coil is presented. To overcome the harsh winding condition of BLDC coil winding, a new wire accumulator is proposed to store or release a wire when the wire is stretched or sagging...
This paper presents a novel one degree of freedom (1DOF) actively positioned bearingless motor. The advantages of the proposed bearingless motor are a compact axial length and high radial stiffness compared with conventional 1DOF bearingless motors. In the proposed bearingless motor, the single-drive bearingless motor concept has been adapted. Both torque and axial suspension force are regulated independently...
The goal of developing high fidelity simulation of muscle force is of considerable interest for the biomedical community. Traditionally Hill models have been incorporated. However, feasible scope of the Hill model is inherently limited, especially in light of the growing relevance of muscle history dependence. History dependence is considered to be significant for motor control and stability. Attempts...
A novel tubular flux-switching permanent magnet (PM) linear motor is proposed in this paper. It takes the hybrid operating principle of conventional flux switching machines and excitation of permanent magnet poles. It helps to increase the magnetic flux density in air gaps, and improve the force output. The complementary phase is employed to reduce force ripples. Modular design methodology is utilized...
Fault monitoring of rotating rectifier in aviation brushless AC generator is a technical problem. Although various diagnosis methods have been developed, they all use the relatively complex algorithms, which increase the software and hardware complexity of generator control unit extremely. A simple and practical monitoring circuit has been designed based on harmonic armature reaction principle of...
This research aims to develop a training unit that is capable of actively implementing the weight-bearing capacity of the arm in any position or orientation, thus cancelling the load on the arm during training. In other words, the aim is to develop an active arm weight-bearing system that has intellectual sensing, control, and driving functions that control motion and force and can be used in training...
Practical operation of a bearingless permanent magnet-type synchronous motor (BPMSM) owes to stable suspension of the rotor. With the variation of operating conditions, conventional PID controller can't adjust its parameters, and the overshoot of the system response is big. Based on rotor flux orientation, a fuzzy self-adaptive PID controller was designed to control the suspending subsystem of a BPMSM...
To solve the problem of coupling between torque and suspension force of 12/8 bearingless switched reluctance motors (BSRMs), the traditional 12/8 BSRMs structure is optimized by designing a new relationship between stator and rotor pole arcs. This document analyzes the distribution characters of inductance, torque and suspension force, derives a mathematical model of suspension force of new structure...
In this paper, a seven-phase inset-type permanent magnetic bearingless motor is proposed with characters as the treble frequency suspension force compensation and elimination of the affection of the third plane to the suspension plane. The winding configuration and harmonic distribution are presented. Then, the analysis formulations of inductance and suspension force of the proposed motor are presented...
Combined Star-Delta windings in electrical machines result in a higher fundamental winding factor and cause a smaller harmonic content. This leads to lower I2R losses in the stator and the rotor winding and thus to an increased efficiency. In this paper, a calculation method is presented to determine these I2R losses for three-phase induction machines with combined star-delta windings. An important...
This paper describes mathematical modeling of a novel wound-field synchronous motor self-excited by space harmonics. The torque equation on the dq-reference frame is investigated to clarify the self-excitation mechanism of the proposed motor. It has been analytically explicated how the motor parameters give influences on the self-excited electromagnet torque. Furthermore, the current phase vs. torque...
For high speed bearingless disk drives, certain topologies are advantageous. The authors have published works on a bearingless disk drive for high speeds which is characterized by a slotless stator and a toroid winding set. Several different variations of this setup are imaginable. The ones which this work focuses on are the variation of the number of phases, of the number of coils, and of the applied...
Increasing in the number of consumers and expansion of the power systems lead to higher levels of short circuit current. Fault current limiters are considered to be the most privileged solutions in future power systems. Saturable core fault current limiters (SCFCL) have proper features to operate in distribution power systems such as high speed response, multi-shots operation and compatibility with...
This paper proposes a ceiling-robots system, con-CEILrge, for a new type service robots by separating a human living space and a robot work space. For the realization of such robot system, a triangle-shaped omni-crawler movement platform, the ceiling structure for the platform, a crane mechanism acceptable to the slant directional traction, and motion control considering variable tention from the...
In this paper, a novel 12/14 bearingless switched reluctance motor (BLSRM) is investigated. For the conventional 12/14 BLSRM, there is only a small conduction range for positive torque generation. In order to solve this problem, shifting stator pole technology is applied in the proposed structure. It is good for increasing the output torque and simplifying the control circuit. However, the proposed...
The advanced assets management and reliability are two important necessity to establish modern smart grids. Playing a vital role, transformers life extension directly increase system reliability and profitability. In this paper we evaluate fault current limiters influence on tensions ensue from external short-circuit currents. We use a mathematical model for fault current limiter, and exploit it in...
The computation of stresses caused by electromagnetic forces on the end windings of large water filling submersible motor has a significant role in both the design and the performance assessment. This paper aims to analyze the stress distribution on the stator end windings during steady state operation by a three-dimensional finite element method (3-D FEM). A 3-D model was set up and some complex...
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