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Sunday, November 8, 2020 | History

2 edition of **Moving coil loudspeaker magnetic circuit design using finite elements** found in the catalog.

Moving coil loudspeaker magnetic circuit design using finite elements

Lesley Anne Binks

- 291 Want to read
- 29 Currently reading

Published
**1999** .

Written in English

**Edition Notes**

Thesis (M.Phil.) - University of Brighton.

Statement | Lesley Anne Banks. |

Contributions | University of Brighton. School of Computing and Mathematical Sciences. |

ID Numbers | |
---|---|

Open Library | OL18206305M |

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The paper investigates on the use of a Finite Elements Method analysis to simulate the behavior of a moving coil loudspeaker and its magnet motor.

A geometrical model is prepared, suitable for FEM. Based on ANSYS parametric design language, a parametric finite element model for magnetic circuit system of moving-coil linear compressor was established and the magnetic analysis was carried out.

The validity and reliability of the finite element model was verified through magnetic Author: Peng Zhao, Shulian Liu, Shuiying Zheng. We eventually chose to design a small moving coil type speaker rather than a moving magnet type speaker and had the other design team go forward with a moving magnet design.

We first used a program called Finite Element Method Magnetics to simulate the dimensions of the magnet we were using in our speaker, in. The moving coil loudspeaker uses the magnetic effect generated by a flowing current as the basis of its operation.

When a current flows in a wire, a magnetic field appears around it. When the wire is wound into a coil, the effect is increased. currents can be examined by Finite Element Figure shows a simplified equivalent circuit of a moving-coil due to the movement of the speaker coil through the magnetic field of.

This paper presents a new design and implementation of a balanced armature speaker (BAS), which is composed of permanent magnetic circuits, a moving armature, and a coil. The armature rocks about a pivot with the coil at one end and the permanent magnet on another.

loudspeaker design and manufacturing are derived. INTRODUCTION Most loudspeakers use a voice coil in the magnetic field to generate a Lorenz force driving the mechanical system.

One of the most important lumped parameter of the electro-dynamical transducer is the force factor l l Bl ez B(rl) dr (1). This is why the characteristics need to be studied with a magnetic field analysis simulation based on the finite element method (FEM).

This Analysis Note explains how to obtain the magnetic flux density distribution and cogging in a moving coil linear motor with skew applied to. LOUDSPEAKER Definition A loudspeaker is an electromechanical transducer that converts an electrical signal into sound.

Basics A loudspeaker, which is also called a speaker, is a device that is used to create the sound in radios, television sets, and electric musical instrument amplifier systems.

How it works Loudspeakers use both electric and mechanical principles to convert an electrical. Unlike the newer dynamic (moving coil) design, a moving-iron speaker uses a stationary coil to vibrate a magnetized piece of metal (called the iron, reed, or armature).

The metal is either attached to the diaphragm or is the diaphragm itself. This design was the original loudspeaker design, dating back to the early telephone.

/ / • All specifications are subject to change without notice. MAGNETIC CIRCUIT DESIGN 1. MAGNETIC CIRCUIT ANALYSIS Basic calculation method The basic calculation method of a magnetic circuit is the same as is used in a basic electrical analysis using.

Magnetic circuit structure of the exciter. The structure diagram of designed electromagnetic angular vibration exciter is shown in Fig.

2, which consists of a closed magnetic circuit, an air bearing, a disk moving component, etc. Especially, the disk moving component mainly comprises a vibration table, a connecting shaft and a disk moving disk moving coil is located in the axial. This paper presents a new Moving coil loudspeaker magnetic circuit design using finite elements book and implementation of a balanced armature speaker (BAS), which is composed of permanent magnetic circuits, a moving armature, and a coil.

non-moving (test case 1) and moving parts (test case 2) and the acoustic-solid interaction problem (test case 3). FAITAL team develops simulations for several areas (i.e. magnetic circuit analysis [1] and thermal analysis [2]), but we will not face these topics in the current study.

Mechanical behaviour of non-moving. Kwon et al. used finite element method (FEM) and response surface methodology (RSM) for the micro-speaker design in mobile phones to maximize electromagnetic force and to minimize the magnetic distortions by considering variables influencing magnetic circuit design.

The authors obtained inner magnet radius of mm, yoke thickness of For moving-coil loudspeakers, the functioning involves energy conversion among the electrical, mechanical, and acoustic fields. For a review of the fundamentals of mechatronic systems, the reader may refer in Fig. 1(a) is a typical moving-coil loudspeaker for the present study, and Fig.

1(b) shows its cross-section view. Since, at low frequencies, the wavelength of this moving-coil. The loudspeaker cone or speaker diaphragm is the main active area of the loudspeaker.

When activated by the coil, it pushes the air backwards and forwards to create the sound waves. The speaker cone design is critical to the performance of the overall loudspeaker and has requirements that are difficult to meet to obtain the optimum performance.

Improved Blocked Impedance Model for Loudspeakers 1. Electrical Equivalent Circuit Model for Dynamic Moving Coil Transducers incorporating a semi-inductor Knud Thorborg 1, Andrew D.

Unruh 2 1 Tymphany A/S, DK Taastrup – DENMARK [email protected] ABSTRACT A serial combination of inductor and resistor is traditionally used to model the blocked electrical.

I joined NXT (now Tectonic Elements) in as a member of the Special Projects team to design & develop new, high power exciter technology.

Using 2d and 3d electro-magnetic finite element analysis, I developed several innovative magnetic circuits and established an assembly and test laboratory to prototype and validate these designs. Inductance and Magnetic Energy Mutual Inductance Suppose two coils are placed near each other, as shown in Figure Figure Changing current in coil 1 produces changing magnetic flux in coil 2.

The first coil has N1 turns and carries a current I1 which gives rise to a magnetic field B1 G. The purpose of this paper to show how the principle of duality between interlinked electric and magnetic circuits can be used in conjunction with finite element simulations. The device used in the derivation of equivalent electric circuits and finite-element models is an industrial alternating current (AC) contactor rated for volts, 60 hertz.

The magnetic system design, is required. We can use FEM software to build a finite - element model, as shown in Fig. 1, and then adjust the materials and topologies of the model in order to get * Manuscript received October 8 ; revised July 15 an optimal distribution compared to the displacement, and October J.

A u d i o E. A magnetic circuit is made up of one or more closed loop paths containing a magnetic flux is usually generated by permanent magnets or electromagnets and confined to the path by magnetic cores consisting of ferromagnetic materials like iron, although there may be air gaps or other materials in the path.

Magnetic circuits are employed to efficiently channel magnetic fields in many. Design and optimization of linear motor for moving coil type linear compressor used for refrigerator and the characteristics of that are studied in this paper. The model of linear oscillating motor is analyzed and simulated by using finite element analysis software.

The basic electromagnetic and mechanical parameters are determined based on magnetic circuit analysis. By using Ansoft finite element analysis, the electromagnetic properties of the electromechanical converter with two push-rods are obtained by modeling, setting materials, grid division and post-processing.

A closed-ended linear voice-coil actuator in which the effects of armature reaction are significantly reduced. The actuator includes a housing formed from longitudinal field plates and end plates which are connected together.

A cylindrical or rectangular core of ferromagnetic material is mounted inside the housing with its ends connected to the end plates. This study presents an analysis and the design of a new flat-type position sensor with an external armature.

One excitation coil and two antiserially connected pickup coils are used in the stationary part. Solid iron segments or steel lamination segments are used for the moving armature. The proposed position sensor was modelled using linear movement. In the majority of electrostatic speaker designs, the high voltage audio is created using a step-up transformer from a conventional audio amplifier designed for moving-coil speakers.

In this paper the applicability of an efficient numerical calculation scheme in the computer-aided design of electrodynmic loudspeakers is demonstrated. This modeling scheme is based on a finite element method (FEM) and allows the precise calculation of the electromagnetic, mechanical and acoustic fields including their couplings.

Furthermore, nonlinear effects in the mechanical behavior of. The magnetic circuit of Fig. might be used to produce a high magnetic field intensity in the narrow air gap.

An N -turn coil is wrapped around the left leg of the highly permeable core. Provided that the length g of the air gap is not too large, the flux resulting from the current i in this winding is largely guided along the magnetizable.

The magnetic field simulation method and analytical method for calculating leakage permeance of bar type permanent magnet in open magnetic circuit are investigated based on the finite element method. An example is given and the results are validated by experiment.

ZYX Ultimate Dynamic Moving Coil Cartridge. We at ZYX have designed many cartridges in our history. However, the Ultimate DYNAMIC design is the first model which incorporates a magnetic circuit that is very different from previous models. As the coil bobbin is a non magnetic material, the signal output is only 1/6 of the required level.

Gilbert Briggs, the founder of Wharfedale loudspeakers, wrote in his book of [ref]: ‘It is fairly easy to make a moving-coil loudspeaker to cover 80 to 8, cycles [Hz] without serious loss, but to extend the range to 30 cycles in the bass cycles in the extreme top presents quite a few problems.

The current in the wire produces a magnetic field. At point 1 this external field is OUT of the page. At point 2 the external field is INTO the page.

This magnetic field passes through the loop and is the source of magnetic flux through the coil. As the loop slides by position 1, the flux through the loop is INCREASING and it is Pointing. Magnetic circuit, closed path to which a magnetic field, represented as lines of magnetic flux, is contrast to an electric circuit through which electric charge flows, nothing actually flows in a magnetic circuit.

In a ring-shaped electromagnet with a small air gap, the magnetic field or flux is almost entirely confined to the metal core and the air gap, which together form the.

Ceramic magnet circuits require a larger magnet to generate high levels of magnetic flux compared to alnico and neodymium, so the ceramic magnet is placed on the outside of the voice-coil.

There are many factors that affect the sound and feel of a speaker, and the magnetic circuit is mostly an indirect influence. There were many studies undertaken in book form that touched the subject of enclosure design but only a few that directly involved this study.

In a study by Cohen (5), entitled Hi-Fi Loudspeakers and Enclosures, an explanation of acoustics and electronics of speaker enclosure designs was presented. Blitz (2) did a study on the elements of wave. This paper investigates the design of axially magnetised moving magnet linear oscillating actuator (LOA) which operates on single phase alternating supply.

Additionally, an alternative path is proposed for the return of magnetic flux from mover to the stator. Using finite element method (FEM) tools, all the parameters of LOA are optimised. Cabinet diffraction effects. Acoustical Engineering, H.F. Olson (Republished by Professional Audio Journals, PO BoxPhiladelphia, PAUSA, publishedLibrary of Congress Catalog Card No.

) See Section Refraction and Diffraction and Section Loudspeaker. Within the audio chain, the loudspeaker could be the element that most influences a user’s auditory experience. A loudspeaker is not only the final element that converts electric input into an audible output, but it is also responsible for an increasing portion of the system’s cost, inefficiency, weight, and size, making it a crucial element for the costumer and the manufacturer.

Figs. 3 and 4, the inventors also predicted the need for using suspension elements at both ends of the dual-coil drive. In Fig. 5 Surh [8] shows an interesting twist on the design without a return circuit collar, incorporating two completely separate magnet assemblies. This design would certainly suffer with poor heat dissipation from.The Woofer also incorporates McIntosh's Patented LD/HP2 Magnetic Circuit Design.

Finite Element Analysis and testing resulted in a design concept which utilizes a pair of aluminum shorting sleeves in the magnetic circuit. The sleeves virtually eliminate the negative influence of the fluctuating voice coil field on the permanent magnet field.The mirror-actuating device generates decoupled scanning motions about two orthogonal axes by combining two electromagnetic actuators of the conventional moving-coil and the moving-magnet types.

We implement a finite element analysis to calculate magnetic flux in the electromagnetic system and experiments using a prototype with the overall size.