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US 8,680,723 B2Granted
Linear actuator
AssigneeJohnson Electric S.A.
InventorsArunkumar Subramanian, HongTao Wang, JinHui Huang
Life of this patent
Estimating the term…
Abstract
A linear actuator includes a stationary part, a movable part moveably supported by the stationary part, and at least one elastic member disposed between the movable part and the stationary part. The stationary part includes a stator core with a pair of teeth extending inwardly there from, and a winding wound on each of the teeth. The movable part disposed between the teeth includes two pairs of permanent magnetic poles respectively facing the teeth and an output shaft projecting in a first direction. When the windings are electrified, the stationary part generates a magnetic field which interacts with the permanent magnetic poles to reciprocate the movable part relative to the stationary part in a second direction perpendicular to the first direction.
Claims13
A linear actuator comprising:
- a stationary part comprising:
- a stator comprising a ring-shaped yoke having a pair of longitudinal sides and a pair of lateral sides, and a pair of teeth each extending inwardly from one of the pair of longitudinal sides;
- and
- a winding wound on one of the teeth;
- a movable part moveably disposed between the pair of teeth and comprising two pairs of permanent magnetic poles each facing one of the pair of teeth and an output shaft projecting in a first direction;
- and
- a pair of elastic members coupling the movable part to the pair of lateral sides of the yoke and configured to generate a returning force in a second direction perpendicular to the lateral sides of the yoke and parallel to the longitudinal sides of the yoke;
- wherein when the windings are electrified, the stationary part generates a magnetic field which interacts with the permanent magnetic poles to reciprocate the movable part relative to the stationary part in the second direction.
5 more elements
A linear actuator comprising:
- a stationary part comprising a stator core with a pair of teeth extending inwardly there from, a winding wound on each of the teeth;
- a movable part moveably supported by the stationary part and disposed between the teeth, the movable part comprising two pairs of permanent magnetic poles respectively facing the teeth and an output shaft projecting in a first direction;
- and
- at least one elastic member disposed between the movable part and the stationary part;
- wherein when the windings are electrified, the stationary part generates a magnetic field which interacts with the permanent magnetic poles to reciprocate the movable part relative to the stationary part in a second direction perpendicular to the first direction,
- wherein the linear actuator further comprises a guiding member for guiding movement of the movable part relative to the stationary part;
- and
- wherein the stator comprises a pair of T-shaped stator cores and a pair of covers respectively connecting upper and lower sides of the stator cores, the covers being made of magnetic material, one of the covers defining a guiding slot extending in the second direction, the output shaft extending through and being movable along the guiding slot.
5 more elements
A linear actuator comprising:
- a stationary part comprising a stator core with a pair of teeth extending inwardly there from, a winding wound on each of the teeth;
- a movable part moveably supported by the stationary part and disposed between the teeth, the movable part comprising two pairs of permanent magnetic poles respectively facing the teeth and an output shaft projecting in a first direction;
- and
- at least one elastic member disposed between the movable part and the stationary part;
- wherein when the windings are electrified, the stationary part generates a magnetic field which interacts with the permanent magnetic poles to reciprocate the movable part relative to the stationary part in a second direction perpendicular to the first direction,
- wherein the linear actuator further comprises a guiding member for guiding movement of the movable part relative to the stationary part;
- and
- wherein the stator comprises a pair of E-shaped stator cores and a pair of covers respectively connecting upper and lower sides of the stator cores, the covers being made of non-magnetic material, one of the covers defining a guiding slot extending in the second direction, the output shaft extending through and being movable along the guiding slot.
5 more elements
A hair clipper comprising:
- a housing,
- a stationary cutter fixed relative to the housing,
- a movable cutter being movable relative to the stationary cutter, and
- a linear actuator configured for driving the movable cutter to move relative to the stationary cutter, wherein the linear actuator comprises:
- a stationary part comprising a stator core with a pair of teeth extending inwardly there from, a winding wound on each of the teeth;
- a movable part moveably supported by the stationary part and disposed between the teeth, the movable part comprising two pairs of permanent magnetic poles respectively facing the teeth and an output shaft projecting in a first direction and connected to the movable cutter;
- and
- at least one elastic member disposed between the movable part and the stationary part;
- wherein when the windings are electrified, the stationary part generates a magnetic field which interacts with the permanent magnetic poles to reciprocate the movable part relative to the stationary part in a second direction perpendicular to the first direction which results in the output shaft reciprocating the movable cutter relative to the stationary cutter;
- and
- wherein the stator core comprises a pair of spaced stator cores and a pair of covers respectively connecting upper and lower sides of the stator cores, the covers being made of non-magnetic material, one of the covers defining a guiding slot extending in the second direction, the output shaft extending through and being movable along the guiding slot.
8 more elements
Dependencies are inferred from the claim text.