Results 21 to 30 of about 28,776 (207)
Efficiency of low power audio amplifiers and loudspeakers [PDF]
, 2001 In this paper we look at the load presented to audio amplifiers by real transducers. We consider the power losses in Class-AB and Class-D amplifier topologies, and determine that in order to predict efficiency it is necessary to consider the amplifier ...
Burrow, SG, Grant, Duncan A
core +2 more sources
Advances in Mechanical Engineering, 2019 Two-stroke engines taking advantages of high power density and light weight as well as small size are widely used on aircrafts. Compared with conventional fuel injection system, gasoline direct injection technology can control the air-fuel ratio ...
Hongli Gao +5 more
doaj +1 more source
Modeling and Control of a Dual Stage Actuator Hard Disk Drive
Journal of Advanced Mechanical Design, Systems, and Manufacturing, 2010 A data-based approach is presented for modeling and controller design of a dual-stage servo actuator in a hard disk drive. The servo actuator in this hard disk drive consists of a conventional voice coil motor and a piezo-electrically actuated suspension.
Uwe BOETTCHER +2 more
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Precision automated assembly device using voice coil motors.
JSME international journal. Ser. 3, Vibration, control engineering, engineering for industry, 1990 A precision automated assembly device which can carry out precision insertion is described. The device is composed of voice coil motors and is named VCM-Hand. We have developed a two = hyphen dimensional VCM-Hand operating in a plane surface with three degrees of freedom of motion for the insertion operation.
Toshiro HIGUCHI +2 more
openaire +2 more sources
Fast Compact Laser Shutter Using a Direct Current Motor and 3D Printing [PDF]
, 2015 We present a mechanical laser shutter design that utilizes a DC electric motor to rotate a blade which blocks and unblocks a light beam. The blade and the main body of the shutter are modeled with computer aided design (CAD) and are produced by 3D ...
Braverman, Boris +3 more
core +2 more sources
Actuators, 2022 This paper presents a flexure-based displacement reduction mechanism driven by a voice coil motor to improve the motion resolution and eliminate the hysteresis nonlinearity of the traditional piezo-actuated micropositioning/nanopositioning stages.
Yunzhuang Chen, Leijie Lai
doaj +1 more source
PM fractional machines adopting bonded magnets: effect of different magnetizations on the energetic performance [PDF]
, 2012 The adoption of Permanent Magnets in small brushless machines for automotive applications is becoming frequent. Some research on bonded magnets is being carried on to substitute the ferrites.
Ferraris, Luca +3 more
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Ironless and Leakage Free Voice-Coil Motor Made of Bonded Magnets [PDF]
IEEE Transactions on Magnetics, 2008 This paper reminds the drawbacks of classical voice-coil motors and presents a way to improve them. Two ironless and leakage free structures are presented, one using traditional sintered magnets and the other one using bonded magnets, giving the pros and cons of each solution.
Remy, Mathias +3 more
openaire +2 more sources
The Research of Technologies of High Precision & Long Life Space Tracking Mechanism
MATEC Web of Conferences, 2017 In the field of space remote sensing technology, this paper researches on the technologies of high precision and long life tracking mechanism. The especial requirements in space for tracking mechanism are presented firstly, and the technologies are ...
Cao Qian, Li Ming, Xu Pengmei
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Calculation, simulation and fast estimation of thermal resistance of rotary voice coil actuators
IET Electric Power Applications, 2022 Rotary voice coil actuator (RVCA) is mainly used for reciprocating drive of small inertia loads in a limited range of angle, which is widely used in aerospace and other fields. Thermal resistance is one of the most important parameters of RVCAs, which is
Jianhui Hu +6 more
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