PROCESS AND DEVICE FOR DETECTING SPEED REDUCTION OF A DC MOTOR, AND A MOTOR COMPRISING SUCH A DEVICE,申请号DE19843463205-传众专利搜索

PROCESS AND DEVICE FOR DETECTING SPEED REDUCTION OF A DC MOTOR, AND A MOTOR COMPRISING SUCH A DEVICE

申请公布号：DE3463205(D1)

申请号：DE19843463205

申请日期：1984.02.03

申请公布日期：1987.05.21

申请人：

ETUDES TECHNIQUES ET REPRESENTATIONS INDUSTRIELLES E.T.R.I SOCIETE ANONYME

发明人：GUERIN-PINAUD, JACQUES

分类号：H02P29/00;G01R31/34;H02H7/08;H02H7/093;(IPC1-7):H02H7/08

主分类号：H02P29/00

摘要：The direct-current motor comprises at least one field winding supplied intermittently with direct-current voltage in order to produce a driving torque by interaction with permanent-magnetic poles which rotate with respect to the winding. The electromotive force of induction produced in the winding by the relative rotation of the permanent-magnetic poles is detected by means of a voltage measurement during the time intervals which elapse when the winding is not energized. A low-speed signal is produced when the electromotive force is below a pre-established threshold in correlation with the desired speed-threshold value.