US 2009/0153000 A1Published application

Motor, thermistor, and manufacturing method of the same

AssigneeAsmo Co., Ltd.

InventorsKazuma SHIBATA, Yasuhiro FUKATSU, Ryousuke SAKAMAKI, Manabu KATO

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Abstract

A thermistor device configures part of an electrical path from a motor feeder section to an armature. A recess defining wall defines an accommodating recess, which accommodates the thermistor device. The thermistor device includes a plate-like thermistor element. A first conductive plate and a second conductive plate sandwich the thermistor element. A pair of first projections 22b are provided at the distal end of the first conductive plate in the insertion direction. A pair of second projections 23b are provided at the distal end of the second conductive plate in the insertion direction. The first projections and the second projections abut against the recess bottom wall in a range that corresponds to the thermistor device except the thermistor element.

Claims9

Dependent claims

A motor powered by a power source, the motor comprising:

an armature;
a feeder section electrically connectable to the power source;
a thermistor device that is electrically connected to the feeder section so as to configure part of an electrical path from the feeder section to the armature;
and
an accommodating and retaining member including a recess defining wall, the recess defining wall defining an accommodating recess for accommodating the thermistor device,
the thermistor device including:
a plate-like thermistor element including a first flat surface and a second flat surface facing each other, the thermistor device being inserted in the accommodating recess along the first flat surface;
and
a first conductive plate and a second conductive plate sandwiching the thermistor element, wherein changes in electric resistance of the thermistor element in accordance with temperature changes being greater than changes in electric resistance of each of the first conductive plate and the second conductive plate, the first conductive plate including a first sandwiching portion secured to the first flat surface by a first conductive connecting member, the second conductive plate including a second sandwiching portion secured to the second flat surface by a second conductive connecting member, the shape of the first sandwiching portion being substantially the same as the shape of the first flat surface, and the shape of the second sandwiching portion being substantially the same as the shape of the second flat surface,
wherein at least one of the first conductive plate, the second conductive plate, and the recess defining wall is provided with a projection,
wherein, when the projection is provided on at least one of the first conductive plate and the second conductive plate, the projection abuts against the recess defining wall in a range that corresponds to the thermistor device except the thermistor element when the thermistor device is viewed from a direction extended from the first flat surface in a state where the thermistor device is accommodated in the accommodating recess, and
wherein, when the projection is provided on the recess defining wall, the projection abuts against the thermistor device in a range that corresponds to the thermistor device except the thermistor element when the thermistor device is viewed from a direction extended from the first flat surface in a state where the thermistor device is accommodated in the accommodating recess.

9 more elements

A motor powered by a power source, the motor comprising:

an armature;
a feeder section electrically connectable to the power source;
a thermistor device electrically connected to the feeder section to configure part of an electrical path from the feeder section to the armature;
and
an accommodating and retaining member including a recess defining wall, the recess defining wall defining an accommodating recess for accommodating the thermistor device,
the thermistor device including:
a plate-like thermistor element including a first flat surface and a second flat surface facing each other, the thermistor device being inserted in the accommodating recess along the first flat surface;
and
a first conductive plate and a second conductive plate sandwiching the thermistor element, wherein changes in electric resistance of the thermistor element in accordance with temperature changes being greater than changes in electric resistance of each of the first conductive plate and the second conductive plate, the first conductive plate including a first sandwiching portion secured to the first flat surface by a first conductive connecting member, the second conductive plate including a second sandwiching portion secured to the second flat surface by a second conductive connecting member, the shape of the first sandwiching portion being substantially the same as the shape of the first flat surface, and the shape of the second sandwiching portion being substantially the same as the shape of the second flat surface,
wherein at least one of the first conductive plate, the second conductive plate, and the recess defining wall is provided with a projection,
wherein, when the projection is provided on at least one of the first conductive plate and the second conductive plate, the projection abuts against the recess defining wall so that the thermistor element, the first conductive plate, and the second conductive plate are separated from the recess defining wall when the thermistor device is viewed from a direction perpendicular to the first flat surface in a state where the thermistor device is accommodated in the accommodating recess, and
wherein, when the projection is provided on the recess defining wall, the projection abuts against at least one of the first conductive plate and the second conductive plate so that the thermistor element, the first conductive plate, and the second conductive plate are separated from the recess defining wall when the thermistor device is viewed from a direction perpendicular to the first flat surface in a state where the thermistor device is accommodated in the accommodating recess.

9 more elements

A method for manufacturing a thermistor device, comprising:

preparing a plate-like thermistor element including a first flat surface and a second flat surface facing each other;
preparing a first conductive plate and a second conductive plate, wherein changes in electric resistance of the thermistor element in accordance with temperature changes being greater than changes in electric resistance of each of the first conductive plate and the second conductive plate, the first conductive plate including a first sandwiching portion, the second conductive plate including a second sandwiching portion, the shape of the first sandwiching portion being substantially the same as the shape of the first flat surface, and the shape of the second sandwiching portion being substantially the same as the shape of the second flat surface, wherein at least one of the first conductive plate and the second conductive plate is provided with a projection, wherein the periphery of each of the first sandwiching portion and the second sandwiching portion is provided with an abutment end, which abuts against a mount portion when the thermistor device is mounted on the mount portion, and wherein the projection projects from part of the abutment end when the first sandwiching portion and the second sandwiching portion are viewed from a flat surface perpendicular direction, which is a direction perpendicular to the first flat surface;
laminating the first conductive plate, the first conductive connecting member, the thermistor element, the second conductive connecting member, and the second conductive plate in a mold in this order, the mold including a mold protrusion, the mold protrusion protruding toward the abutment end, while avoiding the projection;
and
heating the first conductive connecting member and the second conductive connecting member in the mold so as to secure the first sandwiching portion to the first flat surface by the first conductive connecting member and the second sandwiching portion to the second flat surface by the second conductive connecting member.

2 more elements

Dependencies are inferred from the claim text.