In an electromagnetic actuator (5), which comprises a stator (6), a translator (7) movable along a guiding element (10), and an excitation coil (9) for generating an electromagnetic force (Fem) which moves the translator (7), the coil (9) is supplied with an electric current (I) obtained according to the sum of a first electric signal (SC), the time pattern of which defines a desired motion of the translator (7), with a second electric signal (SR), which is generated only at each of given level variations ( VSC) of the first electric signal (SC) by modulating an oscillating function (FO) with a decreasing, time limited function (FD), so that the second signal (SR) has an amplitude envelope (E) having a certain maximum width (VM) such that the electromagnetic force (Fem) is subjected to a higher increase of the static friction force (Fa) between the translator (7) and the guiding element (10).
Method and device for controlling the power supply of an electromagnetic actuator
MARIGNETTI, Fabrizio;
2011-01-01
Abstract
In an electromagnetic actuator (5), which comprises a stator (6), a translator (7) movable along a guiding element (10), and an excitation coil (9) for generating an electromagnetic force (Fem) which moves the translator (7), the coil (9) is supplied with an electric current (I) obtained according to the sum of a first electric signal (SC), the time pattern of which defines a desired motion of the translator (7), with a second electric signal (SR), which is generated only at each of given level variations ( VSC) of the first electric signal (SC) by modulating an oscillating function (FO) with a decreasing, time limited function (FD), so that the second signal (SR) has an amplitude envelope (E) having a certain maximum width (VM) such that the electromagnetic force (Fem) is subjected to a higher increase of the static friction force (Fa) between the translator (7) and the guiding element (10).I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
