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This paper proposes a Magneto Rheological linear clutch for use in human safe robotic applications. The force transmitted to the links of the robot must be precisely controlled for any manipulator if it has to be operated safely alongside humans. The traditional approaches to this problem is using various compliant actuating schemes like Series Elastic Actuators, Joint Torque Control etc. Research...
The high frequency resonant current in coupler would inevitable results in interaction of electromagnetic force (EMF), leading to short service life, poor security and low reliability of wireless power transmission (WPT). It may be worse when electromagnetic shielding (EMS) materials are used. The mechanism and characteristics of the EMF on various EMS materials are revealed. Based on Lorentz force...
In this paper, a Linear Flux-Switching Permanent Magnet Machine (LFSPMM) and Rotating six-phases Flux-Switching Permanent Magnet Machine (RFSPMM) are modeled and compared using FEM. The results from these models are discussed and compared with measurements, regarding shape and amplitude of the resulting back-EMF waveforms. Furthermore, by using current decoupling control algorithm, the second order...
This paper presents the design of an State-PID Feedback Controller (SFCPID) for a highly unstable non-linear system, magnetically suspended balanced beam (MSBB) and analysis of its effects. The modelling of Magnetically Suspended Balance Beam (MSBB) and design of Integral sliding mode controller are carried out using MATLAB/SIMULINK. The disturbance rejection of the controller is investigated and...
Energy harvesting has become an alternative form of power generation over the last few years. The mechanical force induced by wind, water, vibrations using piezoelectric materials, and even the waves of the sea, are examples of energy harvesting methods. However, electromagnetic induction is an especially promising means of harvesting energy, as it is cheap, only coils and magnets being needed for...
In the multi-degree-of-freedom high precision positioning systems, high positioning accuracy can be not achieved only with long-stroke motors. The proposed planar motor with a millimeter range of movement can be used as a precision compensation actuator for long-stroke motors due to its high positioning accuracy, high force resolution, high structural strength and low force ripples. This paper deals...
This paper describes a propulsion system for magnetically levitated vehicles with hybrid magnets, which were studied in place of streetcars and transportation systems in semiconductor production. The new propulsion system for the magnetically levitated vehicle proposed here is low cost and easy to make. We obtained dynamic experimental results and static experimental results of the linear switched...
This paper discuss about the effect of slot-width in slot-type linear motor. Linear motor is a device that produces linear motion without using any mechanical transmission to convert from rotary motion to linear motion. The main objective of this paper is to investigate the effect of slot-width in slot-type linear motor. The force needs to be maintained for used in food processing application. Besides...
Vacuum interrupters are required to perform a wide variety of roles within vacuum circuit breakers. One duty is to pass short-circuit currents with the vacuum interrupters' contacts closed for a period of time (1 to 4 seconds), after which the circuit breaker's mechanism must be able to open the contacts, Thus the possibility of contact welding must be minimized. The flow of current through practical...
Measurement of arc velocity on RMF contacts is an important means for assessing their current interruption performance. The existing literature contains experimental work which has made use of external coils and Hall-effect sensors to determine arc velocity and trajectory. In the present work, a kinematic simulation of the arc motion has been done to generate the resulting voltage waveforms obtained...
This paper investigates reduction in torque and suspension force ripples of an axial-gap type bearingless motor with one-degree-of-freedom (DOF) active positioning in the axial direction. This one-DOF controlled bearingless motor employs only one set of three-phase winding and one three-phase inverter, called a single-drive bearingless motor (SDBelM). The proposed axial-gap SDBelM combines a repulsive...
Although in recent years, the electromagnetic repulsion mechanism based on the eddy current repulsive force quickly become a hotspot, the mechanism can't apply to circuit breaker of long clearance between open contacts and high voltage. So it's vital to find a new one used for circuit breaker of long clearance between open contacts. In this dissertation, a new fast repulsion mechanism of double-coil-structure...
This paper describes a wearable sensor that simultaneously measures both shear and orthogonal force. The planar shear sensor is based on inductive coupling between a small target and a series of adjacent coils. Lateral movement of the target changes the coupling between a primary coil and a series of geometrically shaped and scaled sense coils. Design of the sensor and methods for calibration are...
This paper describes a new method to control the motion of swallowable wireless capsule endoscopy devices. A dynamic magnetic field produced by a set of external magnetic coils is used to manage the locomotion of the capsule. A permanent magnet is embedded into the capsule in order to manipulate the capsule by changing the external magnetic field strength for each specific position. The dynamic magnetic...
Non contact magnetic actuation inside liquids or in ambient environments has gained a large interest over the last few years. A large range of micrometer size particles are controlled using this principle. However little consideration has been made to air/liquid interface, despite the interesting properties of this environment (good repeatability due to the small adhesion forces, and low viscous effects...
This paper presents the design, parameter identification, and control of a 6-axis magnetically-levitated (maglev) nanopositioning stage with the xy travel ranges on the order of centimeters. The maglev stage has a moving frame with Lorentz coils and a stationary Halbach magnet matrix. A new method to identify the dynamic models is developed and verified experimentally. The dimension and the mass of...
In this paper, the performance analysis of the bearingless switched reluctance motor (BSRM) is studied under rotor asymmetric faults. The rotor asymmetric faults cause acoustic noise and vibrations in BSRM, and also affect the performance of the motor. At different currents and different eccentric faults (i.e. SE, DE and ME) the flux linkages, inductance of suspension and motoring windings are taken...
Assembly of micro-scale objects requires us to develop manipulators that are small enough to apply small forces as well as robust enough to be controlled independently in a large number. In this paper, we have designed a specialized surface that can be utilized to control multiple microrobots with magnetic properties independently. The surface accommodates an array of planar microcoils that can create...
This paper presents a FEM based analysis of Magnetic field for decoupled 12/14 bearingless switched reluctance motor (BSRM). The decoupled nature between torque and radial force in BSRM has an advantage to operate with a simple controller and the operating region & performance of motor is also increase. For decoupling purpose torque coils and suspension coils are separately wounded on stator poles...
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