Series electric motor with permanent magnet brake
AssigneeFesto AG & Co.
InventorsAxel Behrens, Walter Berwarth, Gerhard Fetzer, Hansjorg Nothdurft
Life of this patent
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Abstract
A series electric motor having at least one field winding on its stator and a rotor fed through a commutator and brushes, and a device for short circuiting the rotor. Between the stator and the rotor there is at least one permanent braking magnet attached to the stator. When the short circuiting device is put into operation, the permanent magnet field to drive the braking current is strictly predetermined so that a braking effect may cause no additional or harmful sparking at the brushes. The entire braking energy is then directly converted in the motor rotor and there is no necessity for an additional electronic regulating device for the braking current.
Claims13
A series electric motor, comprising an annular stator having two radially inwardly directed stator poles and a field winding wound around each stator pole, a rotor having a rotor winding thereon which is adapted to be fed electrical energy thereto via a commutator and brushes, a short circuiting means for short circuiting the rotor winding, and only one permanent braking magnet secured to the annular stator and located between the annular stator and the rotor and oriented in a region between the two stator poles.
A series electric motor, comprising an annular stator having two radially inwardly directed stator poles and a field winding wound around each stator pole, a rotor having a rotor winding thereon which is adapted to be fed electrical energy thereto via a commutator and brushes, a short circuiting means for short circuiting the rotor, and at least one permanent braking magnet secured to the annular stator and located between the stator and the rotor and oriented in at least one of the two stator poles.
Dependencies are inferred from the claim text.