Patent
Apparatus and method for controlling driving of linear motor
Jae-Mo Lee,Kyung-Bum Heo +1 more
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TLDR
In this paper, an apparatus and method for controlling driving of a linear motor is presented, which includes a detector that detects a current applied to a motor, a controller that outputs a control signal based on the detected current and a switch that varies the number of windings of the linear motor coil on the basis of the control signal.Abstract:
An apparatus and method for controlling driving of a linear motor, which is configured to increase efficiency of a linear compressor and stably drive the linear motor when the linear motor is overloaded. The apparatus includes a detector that detects a current applied to a motor, a controller that outputs a control signal based on the detected current and a switch that varies the number of windings of the linear motor coil on the basis of the control signal.read more
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References
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Patent
Temperature control for a bed
TL;DR: In this paper, a temperature control apparatus for a bed includes at least one heating element, mounted in a resting surface on a mattress of the bed for warming at least a first are(a) of the resting area.
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TL;DR: In this paper, a wake-up alarm is set to ring in some time interval, and one or more physical characteristics of the sleeping subject, including brain wave activity, pulse rate, REM activity, muscle tension, body temperature, hearing acuity, positional changes and the like are monitored to determine whether the subject is in a deep or shallow-sleep phase.
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Linear compressor drive device
TL;DR: In this article, a linear compressor drive device (101) comprising an inverter (2) for supplying a drive current of a specified frequency to a linear compressors (100), where an inverters controller (6) is provided to control the inverter so that the frequency of an output current therefrom is a resonance frequency based on resonance frequency information and to measure the instantaneous values of the output current Id and output voltage Vd of the inverters at a phase timing that renders zero a change in the outputcurrent Id of a inverter to thereby calculate a piston stroke from the
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Silent alarm clock
Paul Berman,Neal Marks,Brad Zieg +2 more
TL;DR: In this paper, a silent alarm clock including a portable receiver unit with a wristwatch-type configuration is presented, where the receiver unit includes a vibrator adapted to create a vibrating sensation upon the receipt of a radio signal.