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Five adult paralichthyid specimens with various kinds of abnormalities are reported from the south‐west Atlantic Ocean. These abnormal flatfish specimens represent the first records of wholly ambicoloured Paralichthys orbignyanus specimens having a deep notch between the eye and dorsal fin and a partially albinistic specimen having skeletal deformities and only the second record of an almost totally...
This paper presents the wave tank test results on an innovative system for converting mechanical energy from waves directly to electricity. It consists of a point-pivoted buoy that oscillates in presence of waves and a ball screw based electro-mechanical generator. A damping force was applied for the system control by connecting the generator to an electrical load. The numerical model of the complete...
This paper presents the design of multi-phase permanent magnet brushless motor for an electrical helicopter tail rotor. The design should guarantee a high reliability because the tail rotor is a safety critical system and should match a given envelope to allow a substitution of the actual mechanisms. In order to obtain high torque maintaining small overall dimensions of the motor, a spoke-type solution...
This paper describes requirements and design principles of an electric motor for helicopter tail rotor application. The application demands high specific power and specific torque with little possibility to adopt a liquid cooling solution. The tail rotor shall also comply with severe safety requirements that directly affect the motor design. Volume and weight constraints make the design of the electrical...
The paper deals with acoustic noise in permanent magnet synchronous motors (PMSM) with tooth concentrated armature windings. In particular, the noise emitted by this kind of motors is investigated with reference to high-torque low-speed applications. In these cases, due to the high number of poles, the stator yoke is usually thin and it is characterized by low natural frequencies that could lead to...
The dynamic focus adjustment is a particular application of a laser-cutting machine, in which an electromechanical actuator (EMA) moves the lens for the correct focus of the laser beam. The Permanent Magnet synchronous motor (PMSM) used in the EMA has been redesign and optimized with a different and new approach. The previous architecture (8-pole, 9-slots) is verified by FEM and tested. The new motor...
This paper presents the design concepts, the optimization and the test results of a Permanent Magnet synchronous motor (PMSM) for an electro-mechanical actuator. This application is for a laser-welding machine for the dynamic wobble of the beam. The motor is directly integrated with the mechanical component due to the reduced envelope available. In order to minimize the total inertia and the motor's...
Coaxial magnetic gears with permanent magnets have a very simple structure with performance comparable with that of mechanical gears. Several solutions with different gear ratios are proposed and the electromagnetic characteristics are analyzed by finite element methods.
This paper focuses its attention on the wave energy converters (WEC), particularly the ones that use a moving body (wave activated bodies) coupled directly to a power take-off (PTO). It describes the analysis and the design of a small reciprocating linear permanent magnet generator. A comprehensive design methodology, which embraces both the electromagnetic and mechanical design, is described. Nonlinear...
This paper describes the analysis and design of an Electromechanical Actuator (EMA) that have been developed to open and close a gate valve for oil and gas applications. The rotating permanent magnet (PM) synchronous motor is integrated with the mechanical components in a rotating-ball nut architecture to minimize the total length and envelope of the actuator. The motion trajectory fits the classical...
This paper presents the design concepts and the test results of a Permanent Magnet Synchronous Motor (PMSM) for an electro-mechanical actuator used in a laser-welding machine for the dynamic wobble of the beam. The motor is directly integrated with the mechanical component in a rotating architecture in order to minimize the total inertia and the actuator's size. A prototype has been manufactured using...
Linear Electro-Mechanical Actuators (LEMA or EMA) are becoming increasingly used in various areas and locations around the More Electric Aircraft (MEA). One application following this trend is the High Lift System. Several system configurations have been designed and evaluated, then focused on the more suitable EMA which is proposed in this document. The design philosophy, actuator configuration,...
This paper represents the design concepts and the test results of a Permanent Magnet Synchronous Motor (PMSM) for an electro-mechanical actuator used in a laser-cutting applications, for the dynamic focus adjustment. The motor is directly integrated with the mechanical components in a rotating-ballscrew architecture in order to minimize the total inertia and the actuator's size. The dynamic motion...
This paper presents the design concepts and the test results of a Permanent Magnet synchronous motor (PMSM) for an electro-mechanical actuator used in high-performance sheet metal bending machine. The motor is directly integrated with the mechanical component in a rotating-ballscrew architecture in order to minimize the total inertia and the actuator's size. The motion trajectory fits the classical...
The design of a prototype linear permanent magnet machine for a linear reciprocating generator is outlined in this paper, at the end, also the characterisation results are described. It has been built to investigate the energy conversion using long/short stroke linear reciprocating generators. The electromagnetic design is based around analytical field solutions which allow the optimisation of the...
The paper describes the design and the experimental characterization of a small reciprocating linear permanent magnet generator. It has been built to investigate operation at speed of 0.5 m/s, for 1.2 meter wave energy converter. A comprehensive design methodology, which embraces both the electromagnetic and mechanical design, is described Nonlinear electromagnetic and structural finite-element analysis...
Development trends in aeronautics involve a better employment of electric motors also in safety critical hazardous applications till now covered by mechanical systems. The electromechanical actuators are gaining a growing interest thanks to their force and power density capability, and the high dynamical performance by electronic control, allowing the design of very compact high efficiency drives...
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