Electrical generator or motor structure – Dynamoelectric – Rotary
Reexamination Certificate
1996-07-18
2001-10-16
Tamai, Karl (Department: 2834)
Electrical generator or motor structure
Dynamoelectric
Rotary
C310S266000
Reexamination Certificate
active
06304010
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a hybrid-type stepping motor, and more specifically, to new improvements in the hybrid-type stepping motor in which the winding and placement of coils are facilitated by employing a solenoid-on-bobbin winding method and the density of coils is increased to provide a high efficiency and low cost design.
2. Description of the Related Art
In the hybrid-type stepping motor conventionally used, as shown in
FIG. 1
, a rotor yoke
9
as an outer rotor is rotatably supported by a stator yoke
6
, and a coil is wound around each tooth
7
of the stator yoke.
FIG. 2
shows the structure, disclosed by Nikkei Mechanical published Aug. 13, 1984, in which a rotor yoke
9
is rotatably supported between an inner stator yoke
6
A and an outer stator
6
B and an unshown coil is directly wound around each of the teeth
7
of the stator
6
A,
6
B. As shown in
FIG. 3
, a rotary shaft
1
is rotatably supported at a pair of bearings
2
,
3
secured on both ends of a casing
4
. A generally ring-shaped stator yoke
6
having a stator coil
5
is mounted on the inner surface
4
a
of the stator casing
4
. A plurality of stator teeth
7
are spaced regular intervals apart circumferentially around the inner circumference of the stator yoke
6
. Disposed between the bearings
2
,
3
are ring-shaped first and second rotor yokes
9
,
10
which are arranged in a unitary body on the rotary shaft with a magnet
8
therebetween, and the rotor yokes
9
,
10
have on their circumferences, a plurality of rotor teeth
9
a
,
10
a
, and the rotor yokes
9
,
10
alternate with each other in polarity. By supplying a driving pulse from an unshown driving circuit to the stator coil
5
, the rotor yokes
9
,
10
rotate stepwise.
The prior art hybrid-type stepping motor thus constructed has the following problems.
In the hybrid-type stepping motor having the rotor yokes having each magnet interposed therebetween as shown in
FIG. 3
, the stator coil wound around each tooth of the stator yoke is positioned inside the casing, and thus coil winding to each tooth is difficult and increasing the density of coil is difficult, too. In the structures shown in FIG.
1
and
FIG. 2
, the coil should be directly wound around each tooth, and thus the same above problems arise.
SUMMARY OF THE INVENTION
The present invention has been developed to solve the above problems, and it is an object of the present invention to provide a high-efficiency and low-cost stepping motor in which the winding and placement of coils are facilitated and the density of coils is increased.
The hybrid-type stepping motor of the present invention comprises a bearing mounted on a fixed shaft, a barrel rotor rotatably supported by the bearing, a plurality of rotor teeth provided on the outer circumference and inner circumference of the barrel rotor, first and second inner stator yokes arranged side by side in the direction of the fixed shaft with a magnet set therebetween and first and second outer stator yokes arranged side by side in the direction of the fixed shaft with the magnet set therebetween, a plurality of stator yoke teeth, first through fourth axially centered circular coil slots facing the barrel rotor and formed around the outer circumferences of the inner first and second stator yokes and the inner circumferences of the outer first and second stator yokes, and first through fourth coils wound in a solenoid-on-bobbin fashion and seated in the respective coil slots, whereby the stator yokes alternate in polarity and the barrel rotor is interposed between the coils.
More specifically, the magnet set comprises a first magnet interposed between the inner stator yokes and a second magnet interposed between the outer stator yokes.
More specifically, the magnet set comprises a first magnet interposed between the fixed shaft and the inner stator yokes and a second magnet interposed between the outer stator yokes and the outer wall of the fixed shaft, whereby the magnets face to each other via the barrel rotor.
REFERENCES:
patent: 4286180 (1981-08-01), Langley
patent: 4501980 (1985-02-01), Welburn
patent: 4672247 (1987-06-01), Madsen et al.
patent: 4857786 (1989-08-01), Nihei et al.
patent: 4920292 (1990-04-01), Albrecht et al.
patent: 4922145 (1990-05-01), Shtipelman
patent: 4945268 (1990-07-01), Nihei et al.
patent: 4970421 (1990-11-01), Kritzinger
patent: 3821660 (1989-08-01), None
patent: 240204 (1987-10-01), None
patent: 0544200 (1993-06-01), None
patent: 2052176 (1979-06-01), None
patent: 58-207856 (1983-12-01), None
patent: 02237456 (1990-09-01), None
patent: 6-303756 (1994-10-01), None
Sughrue Mion Zinn Macpeak & Seas, PLLC
Tamagawa Seiki Kabushiki Kaisha
Tamai Karl
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