Systems and methods for an improved linear motor

Details Systems and methods for an improved linear motor Systems and methods for an improved linear motor

2011-08-30

2011-08-30

Leung, Quyen (Department: 2834)

Electrical generator or motor structure

Dynamoelectric

Linear

C381S412000, C381S422000, C381S419000

Reexamination Certificate

active

08008813

ABSTRACT:
An improved linear motor is provided useful in conjunction with audio equipment for reduced distortion audio output at high voice coil displacements. The improved linear motor may include a yoke, a gap plate which forms an air gap with the yoke, magnets coupled to the yoke and the gap plate, a former, and a voice coil coupled to the former. The magnets generate a magnetic field across the air gap, which is relatively narrow. The former and coil fit in the air gap and may move in a vertical direction. The voice coil includes more than one segment, each having differing electrical resistance. The differing resistances cause the force on the voice coil to be uniform regardless of displacement of the voice coil vertically within the air gap. Resistance differences between the segments may be caused by differing the wire lengths making up each segment of the coil. Likewise, each segment may be made of differing material to vary resistance.

REFERENCES:
patent: 5594805 (1997-01-01), Sakamoto et al.
patent: 7492918 (2009-02-01), Stiles et al.
Adire Audio, Technical Paper, 2006, http://www.adireaudio.com, Lynnwood, WA, U.S., 4 pages.
ECLIPSE, Technical Paper, SW8000 Series, 2008, http://eclipse-web.com/sw/linear.html, 1 page.
Keating, K.L., “Linear Force Conductor” whitepaper and linear transducer design practice and theory, University of California San Diego, Jul. 2008, 26 pages.
Mowry, S., Steallus, Part 1, Voice Coil, 2007, pp. 1-4.
Mowry, S., Steallus, Part 2, Voice Coil, 2007, pp. 1-8.

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