Title:
DEVICE FOR DRIVING ROTARY MAGNET
Document Type and Number:
Japanese Patent JPS5543948
Kind Code:
A
Abstract:
PURPOSE:To minimize the irregular collision energy and restrict the rebound thereof after the collision in a device for driving a rotary magnet by converting the induced voltage of the magnet to speed to thereby feed back it to an energizing circuit to allow the rush current to a stopping point to be set constant. CONSTITUTION:To move a magnet to a target stopping point, start signal is first supplied to a control circuit 1 to excite a rotary magnet 3. Then, the induced electro - motive force generated by this excitation is detected by a speed detector 4 to feed back its output to an energizing circuit 2. Thus, the rotary magnet is controlled at the rotating speed preset to collide with the stopping member at the speed with the target stopping point. Since the induced voltage becomes zero instantaneously by this collision, this point is detected by the detector 5 for the colliding point, and the detection signal is supplied to the control circuit 1. Thus, it generates a command signal to the energizing circuit to excite the holding winding of the magnet to thus restrict the rebound.
Inventors:
WATANABE AKIO
TAKADA MASATOSHI
TAKADA MASATOSHI
Application Number:
JP11533778A
Publication Date:
March 28, 1980
Filing Date:
September 19, 1978
Export Citation:
Assignee:
NIPPON ELECTRIC CO
International Classes:
H02P3/06; H01F7/18; H02P7/00; H02P29/00; (IPC1-7): H01F7/18; H02P7/00