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US 6,091,171 AGranted
Electric motor having rotation detection sensor
AssigneeAsmo Co., Ltd.
InventorsMasanori Ohishi, Yasuo Gotou
Life of this patent
Estimating the term…
Abstract
In a motor having a rotation detection sensor, a Hall IC device for generating an output signal indicative of rotation of a motor rotary shaft is accommodated within a casing. The casing is formed into a longitudinal shape, and is sandwiched between a motor and housing attached to the motor. The casing extends perpendicularly to the rotary shaft in the housing.
Claims12
An electric motor comprising:
- a rotor having a rotary shaft;
- a yoke supporting one end of the rotary shaft rotatably and formed into a flat shape having a pair of parallel flat walls;
- a housing supporting another end of the rotary shaft rotatably and supporting the rotor therein with the yoke;
- position indicating means, mounted on the rotor, for indicating a position of rotation of the rotor;
- signal generating means, disposed to face the position indicating means with a spacing relative to the position indicating means, for producing an output signal varying with the rotation of the rotor;
- a commutator disposed on the rotary shaft;
- a pair of power supply brushes disposed to face each other through the commutator;
- and
- a casing accommodating the signal generating means therein and sandwiched between the housing and the yoke, the casing being disposed between the pair of power supply brushes and one of the parallel flat walls in such a manner that a longitudinal direction of the casing is in parallel with the one of the parallel flat walls and a direction in which the pair of power supply brushes face each other.
6 more elements
An electric motor comprising:
- a rotor having a rotary shaft;
- a yoke supporting one end of the rotary shaft rotatably;
- a housing supporting another end of the rotary shaft rotatably and supporting the rotor therein with the yoke;
- position indicating means, mounted on the rotor, for indicating a position of rotation of the rotor;
- signal generating means, disposed to face the position indicating means with a spacing relative to the position indicating means, for producing an output signal varying with the rotation of the rotor;
- a casing accommodating the signal generating means therein and sandwiched between the housing and the yoke;
- and
- the casing has an engagement protrusion engageable with the yoke and the housing thereby restricting disengagement of the casing from the housing and the yoke;
- wherein the engagement protrusion has an arcuate shape in correspondence with a cylindrical wall part of the yoke.
6 more elements
An electric motor comprising:
- a rotor having a rotary shaft;
- a yoke supporting one end of the rotary shaft rotatably;
- a housing supporting another end of the rotary shaft rotatably and supporting the rotor therein with the yoke;
- position indicating means, mounted on the rotor, for indicating a position of rotation of the rotor;
- signal generating means, disposed to face the position indicating means with a spacing relative to the position indicating means, for producing an output signal varying with the rotation of the rotor;
- a casing accommodating the signal generating means therein and sandwiched between the housing and the yoke, wherein the casing has a central part extending longitudinally and accommodating the signal generating means therein, a connection part provided at one end of the central part for transmitting the output signal to an outside of the casing, and an engagement part provided at another end of the central part;
- and
- the housing has a cut-out through which the casing is inserted in a radial direction of the rotor, and an engagement recess which receives the engagement part of the casing therein.
5 more elements
An electric motor comprising;
- a rotor having a rotary shaft, armature and a commutator;
- a yoke supporting one end of the rotary shaft rotatably;
- a housing disposed axially adjacently to the yoke and supporting another end of the rotary shaft rotatably;
- a sensor for producing an output signal varying with the rotation of the rotor;
- a pair of power supply brushes disposed in one of the housing and the yoke to face each other through the commutator;
- and
- a casing having a longitudinal shape and accommodating the sensor therein, the casing extending in a direction transverse to the rotary shaft at a position radially outside of the rotary shaft, the casing being disposed in a space formed adjacent to the pair of power supply brushes in the one of the housing and the yoke, in such a manner that a longitudinal direction of the casing is in parallel with a direction in which the pair of power supply brushes face each other.
4 more elements
Dependencies are inferred from the claim text.