Linear motor
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United States of America Patent
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Mar 8, 2005
Grant Date -
Nov 25, 2004
app pub date -
Jun 29, 2004
filing date -
Jun 21, 1999
priority date (Note) -
In Force
status (Latency Note)
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Abstract
The present invention provides an improved design of linear motor as well as an improved control strategy. The design allows for a shorted stator, where the armature magnets are controlled to reciprocate to a greater maximum displacement that for a equivalent conventional linear motor. The control strategy is such that a minimum of external sensors are required. The linear motor is driven at its resonant frequency ensuring optionally efficient operation. A determination of the maximum current is made based on a relationship with the resonant frequency and the evaporating temperature/pressure of the vapor entering the compressor. The current is then limited to control the maximum displacement to avoid damage.
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