Abstract
This study considers the motion and the following transient force during attraction of an electromagnetic contactor. The results obtained are as follows. (1) The dynamic load factor of the transient force Fsmax produced on a support plate to that Frmax produced in a cushion rubber shows such the tendency as the parabolic characteristic, which puts the axis with k4 into a principal axis, with the increasing of the spring constant k4 of the support plate. The dynamic load factor to k4 more than 5 k N/mm can be approximately treated as 1. (2) The transient forces Frmax and Frmax increase like a function of the second degree with respect to the attraction velocity vm of a movable core. vm fluctuates within about 7 times with making phase θ of electric source voltage. Therefore it is effective for the transient force reduction that θ is controlled to be constant within allowed attraction time.
