An inductive power transfer apparatus is disclosed. A transmitter generates a first time varying magnetic field. A receiver is separated from the transmitter by a gap, but is located with the first time varying magnetic field. The receiver comprises: a conductor; and a receiver magnet located in the first time varying magnetic field and supported for movement in response to the first time varying magnetic field. The conductor and receiver are positioned relative to one another such that movement of the receiver magnet creates a second time-varying magnetic field in a vicinity of the conductor to thereby induce current in the conductor.

Systems and methods for dipole enhanced inductive power transfer

Controller design of eddy current braking in an air bearing system

The stringent stability requirements imposed by advanced, high-resolution payloads have 
produced an increased interest in the development of better-performing micro-vibration 
isolators. Several devices aimed at mitigating micro-vibrations have been studied and 
implemented, but their application is still far from being ideal due to the several drawbacks 
that they present, such as limited low-frequency attenuation for passive systems or high 
power consumption and reliability issues for active systems.
This research focuses on the modelling and testing of Electromagnetic Shunt Dampers 
(EMSD) characterised by the use of negative impedance converter circuits. An electromagnetic 
damper is a self-excited device that exploits the interaction between a moving 
magnetic field and a conductive material to provide a reaction force to the applied motion.
An EMSD presents several advantages, but the high ratio of system mass over damping force 
produced has limited its application in space missions. The use of a negative resistance can 
considerably lower this ratio since it produces an overall reduction of the circuit resistance
that results in an increase of the induced current in the closed circuit and thus the damping 
performance.
In this thesis, the development of a multiphysics, multi-parametric model of an EMSD is 
presented and accurately corroborated by an extensive test campaign. This damper can be 
classified as a semi-active damper since the negative resistance circuit does not require any 
control algorithm to operate. In terms of damping performance, this research demonstrates 
that an EMSD applied to a 1-DoF system is capable of behaving, throughout the whole 
temperature range of interest, like a 2nd-order mechanical filter in which the resonance 
peak is eliminated and the roll-off slope is -40 dB/dec. Additionally, the proposed EMSD is
characterised by low required power, simplified electronics and small device mass that could 
allow it to be comfortably integrated on a satellite.
This study presents also a possible novel 2-collinear-DoF system design with embedded 
EMSDs. This isolator is capable of achieving a remarkable final decay rate of -80 dB/dec
while completely eliminating the two resonance peaks due to the high attenuation performance 
of the dampers. Moreover, other aspects of the proposed 2-collinear-DoF system
are investigated in order to assess not only the damping performance but also its features at 
system level. This work demonstrates that the fundamental advantages of this system can 
make it a viable, competitive alternative to other actively controlled struts.

Electromagnetic shunt damper for spacecraft micro-vibration mitigation.

We quantitatively analyze a familiar classroom demonstration, Van Waltenhofen's eddy current pendulum, to predict the damping effect for a variety of plate geometries from first principles. Results from conformal mapping, finite element simulations and a simplified model suitable for introductory classes are compared with experiments.

Predicting the Influence of Plate Geometry on the Eddy Current Pendulum

A theory of magnetic damper (eddy-current brake) which can be applied to axial-flux rotating and linear systems moving under the influence of an arbitrary arrangement of magnetic poles is derived from basic electromagnetic principles. Analytical expressions for the braking forces and torques are obtained in the low-velocity limit of the moving nonmagnetic conductor.

https://metaconferences.org/aemjnew/index.php/AEM/article/download/610/338

Analytical results for rotating and linear magnetic brakes

The utility model discloses a device for driving magnet rotating by nonmagnetic motion conductor, comprising a fixing seat on which the nonmagnetic motion conductor is provided, a magnet is placed near the nonmagnetic motion conductor, a rotary shaft is arranged on the magnet, and the rotary shaft is fixed on the bracket of the fixing seat. The device makes use of the interaction of the motion conductor sense magnetic field and the magnet magnetic field to drive the magnet rotate, the magnet and the motion conductor are contactless, and the utility model can be used to develop a new type drive device, a sensor and a demonstrating instrument which is used as the interaction principle of a permanent magnet and the nonmagnetic motion conductor. The utility model also can be widely used in the external drive of a nanometer robot in the blood vessel and the external charging for a cardiac pacemaker in the body permanently, and the utility model can be used in other occasions needing non-contact drive such as a bicycle or other non-contact type wheeled drive electric generator of a motor vehicle, etc.

Device for driving magnet rotating by nonmagnetic motion conductor

The invention discloses an optical fiber grating sensor in a visual light wave band and a demodulating system. The wavelength period of the grating on the optical fiber grating sensor is the wavelength period of visible light. The demodulating system, based on the optical fiber grating sensor in the visual light wave band, uses a CCD-based spectrum analyzer, takes a low-price high-luminance white light diode as a wide band light source and detects and demodulates a reflected or transmitted spectrum of the optical fiber grating sensor by adopting a high-density linear array CCD with high sensitivity in a visible area, thereby greatly reducing the cost of the demodulating system and being beneficial to the popularization and application of an optical fiber grating sensing technology.

Optical fiber grating sensor in visual light wave band and demodulating system

The utility model discloses an experimental device for the interaction of magnetic and nonmagnetic conductors, which comprises a nonmagnetic metal air track, wherein the channel of which is provided with a plurality of photoelectric doors; the nonmagnetic metal air track is provided with a nonmagnetic metal sliding block; the nonmagnetic metal sliding block is provided with a magnet; the upper part of the nonmagnetic metal sliding block is provided with a light shielding piece; the outputs of the photoelectric doors are connected to a processing circuit of a single chip computer. The utility model is the improvement of the traditional air track experiment, so not only can carry out the original traditional air track experiments, but also can well analyze the law of the interaction force of a permanent magnet and a metal guide rail from the experiments. The utility model deepens the understanding action of students to electromagnetic induction phenomena, and is helpful to cultivate the explorative and the innovative abilities of the students.

Experimental device for magnet and non-magnet conductor inter-action

The utility model discloses a device for increasing electromagnetic wave heating efficiency, which comprises an electromagnetic wave generator, a waveguide tube, a radiator and a bunching device, wherein a reflector is arranged in the vicinity of the radiator and the reflection direction of the reflector is the same as the radiation direction of the radiator The reflector in the utility model enables electromagnetic waves to reflect between objects heated and the reflector and enables the objects heated to be capable of absorbing the electromagnetic waves for many times, and the efficiency of electromagnetic wave heating devices of microwave hyperthermia, etc can be improved

Device for increasing electromagnetic wave heating efficiency

A device for rotating a magnet by non-magnetic moving conductor and the method thereof, the method comprises arranging, near a non-magnetic movable conductor, a magnet with rotational shaft, rotating the magnet around the rotational shaft by moving the non-magnetic moveable conductor relate to the said magnet; the device comprises a fixed base, a non-magnetic moveable conductor on the fixed base, a magnet near the non-magnetic moveable conductor and a rotational shaft on the magnet, the rotational shaft is fastened on the frame of fixed base. In the device that rotate the magnet by the interaction between the inductive magnet field of the moving conductor and the magnet field of the magnet, the magnet need not contact the moveable conductor, and can be used for developing a new type driver, sensor and demo for the interaction principle between a permanent magnet and a non-magnetic moving conductor. It can be widely used for external driver for nanometer robot in the blood vessel, an external charger for a heart pacemaker permanently embedded in body and non-contact wheel drove dynamo of bike or other automobile which need non-contact driving.

A device for rotating a magnet by non-magnetic moving conductor and the method thereof

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