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Linear flux switching motor with segmented secondary (LFSMSS) is characterized by two kinds of windings, i.e. the DC field windings and AC armature windings, which are distributed alternately on the mover. LFSMSS is vulnerable to large force ripple. This paper investigates the influence of two design techniques (dummy slot and auxiliary tooth) on the force ripple of LFSMSS. In addition, the simulation...
This paper presents parameters self-turning fuzzy control of magnetic levitation system of controllable excitation linear synchronous motor(CELSM) magnetic suspension feeding platform. Magnetic suspension feeding platform has the characteristics of direct drive and magnetic suspension, which meet requirements of high speed, high positioning precision. Magnetic levitation system is an important subsystem...
A linear actuator suitable for sun tracking applications, heliostats, was investigated. First, a benchmark actuator was modelled using Finite Element (FE) analysis and then a prototype was constructed. The electromagnetic force on the mover was simulated and was found to be in excellent agreement with experiment. Next; a three-phase, direct-drive, linear actuator was proposed, which has a step size...
This paper investigates the flux density and radial force spatial harmonics in large salient pole synchronous hydro-generators. Vibration due to magnetic forces are mainly caused by low order harmonics in the airgap flux density distribution. The influence of winding layout and airgap length on the lowest order radial force component are analysed. Airgap flux density and radial force density distributions...
The amorphous alloy transformer has less no-load current and loss, but the structure characteristics of the runway shape winding make it show greater vibration intensity and noise at the load condition. Based on the structure characteristics of the amorphous alloy transformer with runway shape winding, a leakage-stress-acoustic coupled calculation model is proposed to calculate the electromagnetic...
This paper proposes a novel modular linear primary permanent-magnet vernier (LPPMV) machine. With PMs and windings placed on the primary side, this machine possesses a simple secondary side, suitable for long stroke applications such as urban rail transit. Owing to its appropriate primary structure and the Halbach PM arrays, the proposed LPPMV machine offers higher force density, higher back-EMF and...
The new bearingless doubly salient electro-magnetic motor (BDSEM) with independent dc suspension windings in stator has the advantages of robust structure, and is suitable for high speed application in high temperature environment. The angular position detection is eliminated for suspension force control which decreases the complication and increases the reliability. Although the coupling between...
This paper introduces an inductor magnetic lead screw (IMLS) for simplify the structure of magnetic lead screw (MLS). The IMLS is formed on the basis of reluctance MLS with toroidal windings on both sides of the screw. The windings are assigned by dc current of reserved direction to produce magnetic flux through the air gap. The degree of freedom of the nut and screw is limited to avoid the brush...
Nowadays, the research on maglev motor has mainly focused on the electromagnetic levitation mechanism and control strategy for the rotor. Due to the fact that the characteristics of the air gap flow-field can directly affect the static and dynamic performance of the motor, there exists a big error between the theoretical analysis and practical situation of the rotor movement. However, the bearing...
This paper describes an analytical study undertaken on an electromagnetic actuator design with a displacement amplification mechanism by explaining the physical modeling and formulizing the actuation time of the actuator in terms of physical model variables. This is followed by an experimental investigation on the actuation time of the electromagnetic actuator. Increasing the gap between the electromagnet...
Linear hybrid excitation flux reversal machines are very attractive for low cost long stroke applications due to their simple and cheap secondary structure. This paper proposes a new hybrid excitation flux reversal machines with consequent-pole permanent-magnet arrays first. Owing to the adoption of consequent-pole permanent-magnet arrays, usage of permanentmagnet material of the proposed machine...
In this paper, we consider a new design of a synchronous motor with salient rotor poles and all coils placed on the stator. This design uses a laminated silicon steel rotor, which is not as expensive as a rotor with super strong permanent magnets. This machine design eliminates copper rings on the rotor and brushes which is used in regular synchronous motors, and eliminates disadvantages involved...
The paper proposes a new method of control of the friction-plate electromagnetic clutch, which improves its operation properties and reliability. Draft force generated by the clutch permanent magnet is additionally increased with electromagnet flux on the interval of start and reverse of electric drive under load. A wiring diagram of the reversible electric drive with normally closed polarized electromagnetic...
One main target in modern design of mobile working machines is the reduction of hydraulic oil in the on board actuator systems. This results in making the systems more environmentally friendly and leads to the idea of replacing the hydraulic actuators by electric actuators. Here this approach is presented by implementing electrical tubular linear actuators in a sickle bar, which is coupled with a...
Wave energy conversion can be simplified by using direct drive linear generators which may improve reliability. Numerous topologies of direct drive linear generators have been proposed in the last few decades such as the linear vernier hybrid permanent magnet (LVHPM) machine. However, the cost of this kind of machine is driven by the quantity of permanent magnet (PM) material. This paper proposes...
This paper presents design optimization of high-speed and high-power bearingless motor/generator. Because of absence of separate suspension windings, in addition to the motor windings, and tooth coil arrangement a compact and axially short actuator can be achieved. A surface PM and inset PM rotor geometries are compared. The twin bearingless solution with separate axial active magnetic bearing delivers...
Oil film bearings have high load capacity and large damping. However, at high rotational speeds, fluid forces in the bearings, such as oil whip or oil whirl, can induce self-excited vibrations in the rotor. A hybrid system consisting of oil film bearings and a bearingless motor (BLM) is one of the possible ways in which a heavy rotor can be supported and rotated at high speed without inducing self-excited...
This paper describes a simple integrated winding configuration for a two-degrees-of-freedom (DOF) controlled bearingless motor with 6-slot/6-pole surface-mounted permanent magnet (SPM) structure. This bearingless SPM motor has only three concentrated coils, wound alternately in the stator's 6 slots, and employs only one three-phase inverter for both two-DOF radial magnetic suspension and motor drive...
This paper introduces a novel linear vernier permanent magnet machine (H-LVPMM) with high force density and low force ripple. The permanent magnets (PMs) on secondary uses Halbach array, which can provide a larger flux density in the air gap than that of the conventional surface-mounted PMs configurations, and the primary is composed of three modules, which are separated by two flux barriers. Moreover,...
Bearingless machine technology is well-suited for high-speed applications as it removes the mechanical friction by supporting the rotor with electromagnetic force. For electrical machine, which is operating in high-speed region, a short rotor length is beneficial to avoid the rotor vibration caused by structural properties of long rotor. A 6-slot tooth-coil wound bearingless machine is well suited...
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