scholarly journals Performance Evaluation of a Current Superimposition Variable Flux Machine Using Permanent Magnets

2016 ◽  
Vol 24 (3) ◽  
pp. 161-166
Author(s):  
Akira KOHARA ◽  
Katsuhiro HIRATA ◽  
Noboru NIGUCHI ◽  
Yuki OHNO
Keyword(s):  
Performance Evaluation ◽  
Permanent Magnets ◽  
Variable Flux ◽  
A Current

Microactuator based on electroplated permanent magnets and flexible polydimethyl siloxane diaphragm

2008 ◽  
Vol 222 (3) ◽  
pp. 517-524 ◽  
Author(s):  
Y Su ◽  
H Wang ◽  
W Chen
Keyword(s):  
Permanent Magnets ◽  
Magnetic Energy ◽  
Optical Switch ◽  
Geometrical Parameters ◽  
Maximum Deflection ◽  
Polydimethyl Siloxane ◽  
Flexible Membrane ◽  
Microelectromechanical System ◽  
Planar Coil ◽  
A Current

The design, fabrication, and testing of a novel bidirectional magnetic microactuator were presented in the paper. The microactuator is composed of an integrated planar coil and a flexible polydimethyl siloxane (PDMS) diaphragm with embedded CoNiMnP-based permanent magnet arrays. There is a 7 × 7 array of magnets in a unit. The PDMS diaphragm is 2 mm × mm × 40 μm and the magnet post is 50 × 50 × 20 μm. Computer simulation was applied to verify the geometrical parameters. Electroplating under external magnetic field is carried out to improve the magnetic properties of the electroplated magnet, including coercivity, remanence and magnetic energy, and so on. The measured maximum coercivity, remanence and maximum magnetic energy were 2623 Oe (208.73 kA/m), 0.2 T (2000 G), and 10.15 kJ/m3 with the magnetic post, respectively. Moreover, and the deflection of the PDMS membrane is proportional to the exciting current. In a case of 0.35 A current, the maximum deflection of the membrane is 45 μm. Adjusting the electroplating mould results in the variation of the electroplated structure, thus the calibration of the microactuator. Due to the biomedical compatibility and simplicity of the fabrication, the flexible membrane-based microactuator is potential to be used as micropump and optical switch, the microelectromechanical system applications.

scholarly journals Permanent Magnets Aging in Variable Flux Permanent Magnet Synchronous Machines

2020 ◽  
Vol 56 (3) ◽  
pp. 2462-2471
Author(s):  
Daniel Fernandez ◽  
Maria Martinez ◽  
David Reigosa ◽  
Juan M. Guerrero ◽  
Carlos Manuel Suarez Alvarez ◽  
...  
Keyword(s):  
Permanent Magnet ◽  
Permanent Magnets ◽  
Synchronous Machines ◽  
Permanent Magnet Synchronous Machines ◽  
Variable Flux

scholarly journals Designing and analyzing two non-invasive current sensors using Ampere Force Law (AFL)

2019 ◽  
Author(s):  
Mohammad Reza Zamani Kouhpanji
Keyword(s):  
Power Consumption ◽  
Magnetic Force ◽  
Permanent Magnets ◽  
Current Sensor ◽  
Single Wire ◽  
Non Invasive ◽  
Ampere Force ◽  
The Wire ◽  
Current Sensors ◽  
A Current

Here two different non-invasive current sensors are proposed, modeled and analyzed. The current sensors are based on the Ampere Force Law (AFL), defining the magnetic force between two parallel wire carrying currents. These current sensors can be used for detecting/sensing DC and AC currents as well as their combination in a single wire or multiple wires, and they do not rely on any permanent magnets for operation. In the first configuration, there are two microbeams, in which one of them is at the vicinity of the wire and undergoes the mechanical vibrations due to the magnetic force between the wire and the microbeam. The movement of the microbeam while it is generating a magnetic field induces a current inside another microbeam, which is stationary, as the output signal of the current sensor. In the second configuration, a single composite piezoelectric microbeam is used. The magnetic force between the wire and the piezoelectric microbeam leads the piezoelectric microbeam to move, thus it produces a voltage. Both configurations present extremely low power consumption, which is not dependent on the sensitivity of the current sensors. The dynamic response, sensitivity and power consumption of the current sensors are investigated, compared and discussed.

scholarly journals DC Current Control Method of a Current Superimposition Variable Flux Machine

2017 ◽  
Vol 25 (2) ◽  
pp. 125-130
Author(s):  
Akira KOHARA ◽  
Katsuhiro HIRATA ◽  
Noboru NIGUCHI ◽  
Kazuaki TAKAHARA
Keyword(s):  
Control Method ◽  
Current Control ◽  
Variable Flux ◽  
Dc Current ◽  
A Current

scholarly journals Current superimposition variable flux reluctance motor with 8 salient poles

Open Physics ◽  
2017 ◽  
Vol 15 (1) ◽  
pp. 857-861
Author(s):  
Kazuaki Takahara ◽  
Katsuhiro Hirata ◽  
Noboru Niguchi ◽  
Akira Kohara
Keyword(s):  
Finite Element Analysis ◽  
Electric Vehicles ◽  
Hybrid Electric Vehicles ◽  
Rotation Speed ◽  
Element Analysis ◽  
Iron Losses ◽  
Reluctance Motor ◽  
High Rotation Speed ◽  
Variable Flux ◽  
A Current

AbstractWe propose a current superimposition variable flux reluctance motor for a traction motor of electric vehicles and hybrid electric vehicles, which consists of 10 salient poles in the rotor and 12 slots in the stator. However, iron losses of this motor in high rotation speed ranges is large because the number of salient poles is large. In this paper, we propose a current superimposition variable flux reluctance motor that consists of 8 salient poles and 12 slots. The characteristics of the 10-pole-12-slot and 8-pole-12-slot current superimposition variable flux reluctance motors are compared using finite element analysis under vector control.

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