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,
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.
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A motor comprising: a housing; a stator having inner and outer walls; the stator comprising first and second opposed poles (a) formed on opposed locations of the inner wall, (b) having cylindrical inner surfaces defining a longitudinal axis, and (c) extending axially of the inner wall; the stator co
A motor comprising: a housing; a stator having inner and outer walls; the stator comprising first and second opposed poles (a) formed on opposed locations of the inner wall, (b) having cylindrical inner surfaces defining a longitudinal axis, and (c) extending axially of the inner wall; the stator comprising first and second stator windings wound, respectively, around the first and second poles; an armature rotatably supported in the housing and extending along and rotatable about the longitudinal axis of the stator; the armature comprising a rotor and an armature winding wound on the rotor; a switch having a first position for supplying power to the stator and armature windings for operation of the motor and having a second position for short circuiting the armature windings; a first and second opposed, axially extending slots formed in the first and second poles; first and second permanent magnets located respectively in the first and second slots; first and second straps, respectively, extending along the first and second slots, extending around and retaining the first and second magnets in the first and second slots and having a width approximately equal to the width of first and second slots to thereby substantially fully enclose the first and second magnets within the first and second slots; and first and second means for retaining, respectively, the first and second straps in tight engagement with the first and second magnets.
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