DC MOTOR CONTAINING A BRAKE MEANS
First Claim
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1. A brake means for a DC electric motor having a casing, an armature and field poles, said brake means comprising:
- a fan connected to said armature for cooling said motor;
a braking disc of magnetic material and mechanically biased against said fan for braking said armature;
a plurality of pins rigidly connected to said disc;
spring means disposed about said pins for exerting a force and mechanically biasing said disc against said fan;
pin holders fixed to said casing for slidably holding said pins thereby slidably securing said disc to said casing; and
said braking disc having portions disposed adjacent the inner ends of said field poles to form magnetic leakage paths therebetween for causing magnetic forces opposite to said spring force when said field poles are energized thereby sliding said disc away from said fan to permit motor operation while yet insuring braking action whenever said field poles are turned off, permitting said spring means to slide said disc against said fan.
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Abstract
A DC motor which contains a novel brake means within it, said brake means comprising a magnetic disc which is pressed against the cooling fan of the motor by means of springs when the motor is not energized, but which is automatically separated from the fan by the magnetic force produced by the field windings when the motor is energized thereby to relieve the braking force.
36 Citations
3 Claims
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1. A brake means for a DC electric motor having a casing, an armature and field poles, said brake means comprising:
- a fan connected to said armature for cooling said motor;
a braking disc of magnetic material and mechanically biased against said fan for braking said armature;
a plurality of pins rigidly connected to said disc;
spring means disposed about said pins for exerting a force and mechanically biasing said disc against said fan;
pin holders fixed to said casing for slidably holding said pins thereby slidably securing said disc to said casing; and
said braking disc having portions disposed adjacent the inner ends of said field poles to form magnetic leakage paths therebetween for causing magnetic forces opposite to said spring force when said field poles are energized thereby sliding said disc away from said fan to permit motor operation while yet insuring braking action whenever said field poles are turned off, permitting said spring means to slide said disc against said fan.
- a fan connected to said armature for cooling said motor;
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2. A brake means as in claim 1 wherein:
- said fan includes a ringlike groove opposite said disc and having a cross section with a top width less than a bottom width; and
a lining material filled and molded within said groove.
- said fan includes a ringlike groove opposite said disc and having a cross section with a top width less than a bottom width; and
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3. A brake meAns as in claim 1 wherein:
- said fan includes a ringlike groove opposite said disc and having a plurality of holes formed therethrough; and
a lining material filled and molded within said groove and at least partially extruded through said holes.
- said fan includes a ringlike groove opposite said disc and having a plurality of holes formed therethrough; and
Specification
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Current AssigneeHigashino Toshimitsu, Inagaki Sinichi
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Original AssigneeHigashino Toshimitsu, Inagaki Sinichi
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InventorsHIGASHINO TOSHIMITSU, INAGAKI SINICHI
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Application NumberUS04/856,068Time in Patent Office519 DaysField of SearchUS Class Current310/77CPC Class CodesH02K 7/1028 axially attracting the brak...
