Motor with permanent magnet actuated brake

Details Motor with permanent magnet actuated brake Motor with permanent magnet actuated brake

1994-02-22

1995-08-22

LaBalle, Clayton E.

Electrical generator or motor structure

Dynamoelectric

Rotary

310103, 310154, H02K 710, H02K 4900, H02K 2126, H02K 4910

Patent

active

054443180

ABSTRACT:
A universal motor comprises an armature 13, brushes 15, 17 and stator or run windings 19, 21. To provide a permanent magnet actuated dynamic brake circuit 22, permanent magnets 23, 25 are located, respectively, in opposed stator poles 27, 29. In the run mode, power is supplied to stator windings 19, 21 from a rectified ac power supply 33, 35. In the brake mode, brake circuit 22 is actuated by short circuiting armature 13. Due to back EMF, the current flows through armature 13 in a direction opposite to that produced by the rectified ac input in the run mode to provide dynamic braking. To precisely and durably mount magnets 23, 25 in stator poles 25, 27; straps 69, 71 extend around and completely entrap magnets 23, 25 in slots 65, 67.

REFERENCES:
patent: 2062938 (1936-12-01), Ruppe
patent: 3790830 (1974-02-01), Bonfiglio
patent: 4587449 (1986-05-01), West
patent: 4769624 (1988-09-01), Merritt et al.
patent: 4855630 (1989-08-01), Cole
patent: 4916344 (1990-04-01), Hammer et al.
patent: 5087845 (1992-02-01), Behrens et al.
patent: 5281881 (1994-01-01), Gentry et al.

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