EP 0276009 A3 19890719 - DEVICE FOR INDICATING THE WEAR CONDITION OF THE BRUSHES OF AN ELECTRICAL MACHINE
Title (en)
DEVICE FOR INDICATING THE WEAR CONDITION OF THE BRUSHES OF AN ELECTRICAL MACHINE
Publication
Application
Priority
DE 3701643 A 19870121
Abstract (en)
[origin: EP0276009A2] An indicating device (1) with a signal transmission device for indicating the wear condition of the brushes of a DC motor (8) or DC generator, has a contact (7), built into the brushes, which closes (2, 3, 15, 11, 5, 7, 10) a signal transmission circuit when a predetermined wear condition is reached, the said circuit containing a current sensor device (3). In order to produce a wear condition indicating device which requires as few additional electrical components on the machine as possible, or none at all, and in which, as far as possible, only one line is required between the machine (8) and the indicating unit (1), it is proposed to arrange in the signal transmission circuit (2, 3, 15, 11, 5, 7, 10) a frequency generator (2) and at least one capacitor (5 or 15) whose capacitance is tuned such that the capacitor (5 or 15) is conductive for current of the frequency determined by the frequency generator (2).
IPC 1-7
IPC 8 full level
H01R 39/58 (2006.01)
CPC (source: EP)
H01R 39/58 (2013.01)
Citation (search report)
- [A] DE 3417711 A1 19851114 - LICENTIA GMBH [DE]
- [A] DE 3514686 A1 19861106 - BSG SCHALTTECHNIK [DE]
- [A] DE 3215251 A1 19831110 - VAHLE PAUL KG [DE]
Designated contracting state (EPC)
DE FR GB IT
DOCDB simple family (publication)
EP 0276009 A2 19880727; EP 0276009 A3 19890719; DE 3701643 A1 19880804
DOCDB simple family (application)
EP 88100879 A 19880121; DE 3701643 A 19870121