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Disclosed is an actuator home latch design which allows for implementation of any combination of latch/unlatch forces.
English (United States)
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ADJUSTABLE MAGNETIC ATTRACTION HOMELATCH FOR VOICE COIL ACTUATORS
By utilizing a magnet 1 in the latch 2, you determine the unlatch force by the attraction forces to the pin 3. Distance and magnet size are the fundamental results for this force. The latch force (which is the hardest to control force) is determined by the pin 4 located on the pole piece 5. The pole magnets 6 are oriented as shown in order to provide a repelling force to the latch magnet 1. The pin 4 thereby provides a flux path which generates the attraction force. If pin 4 is all the way recessed, you get a repelling force; however, as you adjust pin height, you increase the attraction force until the latch magnet 1 attracts to the pin. This thereby can allow you to create any attraction force desired by specifying pin height (see the figure).
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