Power-off electromagnetic brake

Details Power-off electromagnetic brake Power-off electromagnetic brake

2011-06-21

2011-06-21

Rodriguez, Pam (Department: 3657)

Brakes

Operators

Spring

C188S161000, C361S152000, C361S154000

Reexamination Certificate

active

07963374

ABSTRACT:
The power-off electromagnetic brake (2) attracts an armature that is pressed by a spring force to a rotating member by a magnetic attraction force that is generated by energizing an exciting coil, and brake force that is acting on the rotating member is released. A voltage control circuit (12) continuously energizes the exciting coil for a fixed length of time and generates a considerable magnetic attraction force in order to attract the armature to a yoke when a brake power source (14) is switched on during brake release. After the armature has been attracted to the yoke, the voltage control circuit (12) intermittently energizes the exciting coil at a set cycle and a set on/off duty ratio to hold the armature in an attracted state to the yoke, thereby reducing power consumption and heat generation.

REFERENCES:
patent: 4458290 (1984-07-01), Miyashita
patent: 5235303 (1993-08-01), Xiao
patent: 6650113 (2003-11-01), Sekiya
patent: 6925975 (2005-08-01), Ozawa et al.
patent: 2000-304073 (2000-10-01), None
patent: 2001-349358 (2001-12-01), None

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