Multiple magnetic air gap motor
A magnetic gap and air gap technology, which is applied in the field of high-power low-frequency transducers, can solve the problems of reducing the effectiveness and reliability of transducers, physical damage to speakers, and failure to raise voice coils, etc.
Active Publication Date: 2012-10-17
BOSCH SECURITY SYST INC
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AI Technical Summary
Problems solved by technology
This high temperature has the adverse effect of reducing the effectiveness and reliability of the transducer
Existing techniques for reducing voice coil temperature include cooling the voice coil with air circulation, but these existing techniques do not provide the volume and velocity of air flow required for effective cooling
[0003] Another problem with existing high powered loudspeakers is that the extreme forces involved in axially vibrating the voice coil sometimes lead to physical damage to the loudspeaker
For example, the inertia of the moving voice coil may cause the voice coil to vibrate beyond the safe range of motion, causing bumps between speaker parts or speaker parts being pulled away from each other
[0004] The prior art neither discloses nor proposes a high-power low-frequency transducer that effectively limits the voice coil temperature so that the validity and reliability of the voice coil is guaranteed, and the range of motion of the voice coil is effectively limited to prevent damage to the transducer
Method used
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Embodiment Construction
[0025] Referring to the attached drawings, especially figure 1 , there is shown an embodiment of the loudspeaker 20 of the present invention, which includes a motor assembly 22, a frame 24 mounted to the motor assembly 22, a diaphragm 26, a lower suspension or support bracket 28 and an upper suspension or ring bracket 30. The motor assembly 22 includes a pole 40 having a stack of four steel disks 32 , a permanent magnet 36 below the lower steel disk 32 , and another steel disk 34 disposed below the magnet 36 . Each steel disc 32, magnet 36 and steel disc 34 may be bonded to each other.
[0026] The motor assembly 22 also includes a cylindrical structure 38 surrounding the pole 40 and having an annular upper steel ring 42 disposed atop an annular magnet 44 . Magnets 44 are in turn arranged on top of a stack of four further annular steel rings 46 . Top ring 42, magnetic ring 44, and steel ring 46 may be bonded to each other. Disks 32, 34 and rings 42, 46 may be made of mild s...
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A low frequency transducer arrangement includes a substantially cylindrical structure surrounding a pole piece. The pole piece and the substantially cylindrical structure define a substantially cylindrical air gap therebetween. Two opposite ends of the air gap are both open and separated from each other in an axial direction. A first magnet is disposed in either the pole piece or the substantially cylindrical structure. A second magnet is separated in the axial direction from the first magnet by a middle magnetic gap. The second magnet is disposed in either the pole piece or the substantially cylindrical structure. The first and second magnets provide flux in a same direction in the middle magnetic gap. A top magnetic gap is disposed axially adjacent the first magnet and opposite the middle magnetic gap. A bottom magnetic gap is disposed axially adjacent the second magnet and opposite the middle magnetic gap. A voice coil is at least partially disposed in the air gap and operates in the middle magnetic gap.
Description
technical field [0001] The present invention relates to high power low frequency transducers, and more particularly to high power low frequency transducers having a magnetic structure with an air gap and a voice coil located in the air gap. Background technique [0002] A high powered low frequency transducer, often referred to as a "loudspeaker", has a magnetic structure with an "air gap" and a voice coil located in the air gap. At normal operating sound pressure levels, it is not uncommon for voice coil temperatures to reach 280°C (536°F). This high temperature has the adverse effect of reducing the effectiveness and reliability of the transducer. Existing techniques for reducing the temperature of the voice coil include the use of air circulation to cool the voice coil, but these prior art techniques do not provide the sufficient volume and velocity of air flow required for effective cooling. [0003] Another problem with existing high power loudspeakers is that the ext...
Claims
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IPC IPC(8): H04R9/02H04R9/06
CPCH04R9/025H04R9/022H02K9/16
Inventor A·巴布
Owner BOSCH SECURITY SYST INC