Electricity: motive power systems – Linear-movement motors
Patent
1994-05-27
1996-06-25
Stephan, Steven L.
Electricity: motive power systems
Linear-movement motors
360 7806, 360 7804, 318560, H01F 713, G01R 114
Patent
active
055303242
DESCRIPTION:
BRIEF SUMMARY
This invention relates to resonance reducing arrangements and more particularly, but not exclusively, to arrangements for reducing resonance in displaceable mechanical elements and devices, hereinafter called "devices".
With all mechanically displaceable devices a force application means essentially applies a force to the device to displace the device from a first position to a desired displaced position.
When the device is such, or is so arranged, that in the displaced position the device is under a resilient load, urging the device to return to its first position, the force applied by the said force application means must be sufficient to displace the device to the desired displaced position and the force application means must be displaced to a position where it can hold the device at the said displaced position for as long as is desired.
In the prior art methods for displacing a device against a resilient loading with a relatively slow displacement of the device to the desired displaced position the force application means can maintain contact with the displaceable device, whereupon a smooth, resonance-free displacement can be obtained.
When a rapid movement of the device is required, the force application means must rapidly accelerate the device to the desired position, at which position the force application means will stop accelerating the device and adopt a position where it can retain the device in the desired displaced position.
However, as at the time the device reaches the desired position said device has momentum, the said device will travel beyond the desired position until the momentum of the device is balanced by the resilient forces urging the device to return to its first position, whereupon the device will be accelerated back towards the desired position.
At the desired position the device will strike, or will otherwise be influenced by, the force application means and the momentum of the returning device will be resisted by the force application means but when the momentum of the device at the desired position exceeds the holding force of the force applicator means the device will to pass through the desired position, causing displacement of the force application means, until the force applied by the force application means overcomes the momentum of the device, whereupon the force application means will again accelerate the device towards and beyond the desired displaced position. Thus, the device is caused to resonate or vibrate, with reducing amplitude, until it becomes relatively stable at the desired displaced location.
The problem of resonance of the device at the desired location is particularly disadvantageous with such devices as mirror displacing means, for example "Q" switches in laser constructions, and wherein the response time for the mirror to displace to and settle at a predetermined displaced position can be critical to the efficiency of the laser.
According to the present invention there is as provide a method for reducing resonance of a displaceable device comprising the steps of causing a force application means to displace to deliver a displacement force pulse to the device to initiate displacement of the device in the desired direction from its first position, terminating the displacement force pulse accelerating the device before the device reaches its predetermined position, and reactivating the force application means to cause said force application means to displace to that position where it will hold the device in the desired displaced position.
Preferably the method is characterised by the steps of arranging the said displacement force pulse to be of such magnitude and duration as to cause the displaceable device to accelerate towards its desired displaced position and, when the displacement force pulse is removed, to decelerate toward said desired displaced condition so as to approach said desired displaced position with reducing velocity.
Preferably the method includes the steps of reactivating the force application means whilst the device is decelerating to
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patent: 5243241 (1993-09-01), Wang
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Gaskell Edwin D.
Stevens William H.
Drucker William A.
Jones Judson H.
Stephan Steven L.
Technology Systems Limited
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