Direct current motor with permanent magnet stator
AssigneeSpal Automotive S.R.L.
InventorAlessandro Spaggiari
Life of this patent
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Abstract
Described is a direct current motor (1) with permanent magnet stator, having at least four stator poles (5, 6, 7, 8) which are spaced at equal angular intervals about the rotation axis (A) of the rotor (3) and which generate a magnetic field that is asymmetrical about the rotation axis (A) of the rotor (3) and where the rotor winding (4) can be powered partially and selectively at least at two fixed, explementary angular sectors.
Claims14
A direct current motor with permanent magnet stator, comprising a rotor (3) with a respective winding (4) and at least four stator poles (5, 6, 7, 8) angularly spaced about the rotation axis (A) of the rotor (3), an outer casing (2), at least two positively polarized brushes (11, 12) and at least two negatively polarized brushes (13, 14) where the positively polarized brushes (11, 12) are radially aligned with respective stator poles (5, 7) and the two negatively polarized brushes (13, 14) are angularly spaced, each on one side opposite the other, between the positively polarized brushes (11, 12), wherein:
- the rotor winding (4) can be powered partially and selectively at least at two fixed, explementary angular sectors,
- the stator poles (5, 6, 7, 8) generate a magnetic field that is asymmetrical about the rotation axis (A) of the rotor (3), and
- the negatively polarized brushes (13, 14) are electrically connected to each other, while at least two positively polarized brushes (11, 12) are electrically isolated from each other, are radially aligned, respectively, with a first stator pole (5) and with a second stator pole (7) that have different magnetic properties and can be selectively powered so that can drive the motor (1) at a respective speed.
Dependencies are inferred from the claim text.