Electrical generator or motor structure – Dynamoelectric – Rotary
Reexamination Certificate
2000-03-08
2002-10-01
Waks, Joseph (Department: 2834)
Electrical generator or motor structure
Dynamoelectric
Rotary
C310S105000, C118S267000, C482S002000
Reexamination Certificate
active
06459184
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to ergometer loading devices, and more particularly to an ergometer loading device with large braking force.
2. Description of the Background Art
An ergometer loading device of interest to the present invention is disclosed, for example, in Japanese Patent Publication No. 2-45905.
FIG. 6
is a block diagram which shows a main part of a bicycle ergometer disclosed in the publication. Referring to
FIG. 6
, the loading device of the bicycle ergometer includes a loading portion
50
to apply a load to a rider, and a control portion
60
to control loading portion
50
. Loading portion
50
includes a load shaft
51
rotated when the rider presses down a pedal, a wheel
52
fixed on load shaft
51
, and an annular disk
53
of a copper plate, for example, provided on the circumference of wheel
52
. In order to facilitate rotation of disc
53
, that is, wheel
52
, an annular weight ring
54
having a flywheel function is attached to a linkage portion between wheel
52
and disk
53
.
In connection with disk
53
, only one electromagnet
57
is provided and fixed to a frame
58
. Electromagnet
57
is formed of a core
55
and an exciting coil
56
which is wound around core
55
by means of a coil bobbin, not shown. Core
55
, which is a C-shaped core having one opening, is provided to sandwich, in a non-contact manner, the both main surfaces of disk
53
between the opening end surfaces.
Exciting coil
56
has its one end terminal connected to a direct voltage source V
D
and its other terminal is connected to ground via a control transistor
61
and a resistor
62
. The base of control transistor
61
is supplied with an output of a comparator
63
. Control transistor
61
, resistor
62
, comparator
63
, a CPU described below, and the like form control portion
60
and carry out a control operation so that a current, which is set, is supplied to exciting coil
56
.
The setting of the current to be supplied to exciting coil
56
is controlled through a key board
66
provided for a control panel, not shown, CPU
65
, a display
67
and a D/A conversion circuit
64
as described below. A user enters desired braking torque (a load of the ergometer according to the user's athletic ability) by using key board
66
. The entered braking torque is displayed on display
67
through CPU
65
and can be checked. When the braking torque is determined, CPU
65
calculates an exciting current which is necessary to add the braking torque.
Another example of the conventional ergometer loading device will be shown in FIG.
7
. Referring to
FIG. 7
, the example of the conventional ergometer does not employ a C-shaped core as shown in
FIG. 6
but it includes a drum shape in which a rotor rotates around a stator. Referring to
FIG. 7
, an inner circumferential rotor
72
of a structural carbon steel pipe (STK or STKM) is fit in an outer circumferential rotor
71
made of gray cast iron. On an inner stator
73
, six exciting coils
74
are provided opposite rotor
72
. Exciting coils
74
are connected in series with each other and have their both ends connected to a power supply
75
provided outside. In this case, the controlling and the like of the ergometer are the same as in FIG.
6
.
The conventional ergometer loading device is formed as described above. In the example shown in
FIG. 6
, the opening (the portion denoted by A in
FIG. 6
) of C-shaped core
55
is about 1.7 mm, and disk
53
which is formed of a copper plate with a thickness of 1 mm is inserted in the opening. Since the attachment portion of core
55
and the attachment shaft of the copper plate are different, adjustment operations are difficult to avoid contact between the copper plate and core
55
. Since the copper plate has a thickness of 1 mm, it is easily deformed by small external force, and it takes time to make an adjustment to avoid contact with core
55
.
In the structure in which the copper plate is inserted in the C-shaped core, the total gap of an air gap and a thickness of the copper plate is proportional to magnetic resistance, and thus the magnetic resistance of the gap increases as the total gap becomes larger.
Since the loading device shown in
FIG. 7
has a drum shape and coaxially includes a rotor corresponding to the disk and a stator forming the core, it does not cause the problems as in FIG.
6
. However, the loading device uses carbon steel (at most 0.12%) for outer circumferential rotor
71
and inner circumferential rotor
72
. In other words, the ferromagnetic body is also used for the conductor. Therefore, the generated braking torque is small.
SUMMARY OF THE INVENTION
Therefore, one object of the present invention is to provide an ergometer loading device which is adjusted easily and applies large braking force.
Another object of the present invention is to provide an ergometer loading device which is inexpensive, adjusted easily and applies large braking force.
Still another object of the present invention is to provide an ergometer loading device which is adjusted more easily and applies larger braking force.
An ergometer loading device according to the present invention includes a rotor which has a steel plate and a member of small electric resistance provided on the steel plate and is rotatable about a prescribed shaft, and a stator which is coaxial with the rotor and faces the rotor with a prescribed gap therebetween, the stator including a plurality of exciting coils, and a member of small electric resistance faces the stator with a prescribed gap therebetween.
According to the present invention, the stator is provided which is coaxial with the rotor and faces the rotor with a prescribed gap therebetween, and the member of small electric resistance faces the stator with a prescribed gap therebetween. Therefore, an ergometer loading device which is adjusted easily and applies large braking force can be provided.
Preferably, the member of small electric resistance is plated with copper.
More preferably, the thickness of the plated copper is from 0.01 mm to 0.8 mm.
In another aspect of the present invention, an ergometer loading device includes a rotor which has a steel plate and a member of small electric resistance provided on the steel plate, and a stator which faces the rotor with a prescribed gap therebetween. The stator includes a plurality of exciting coils, and the member of small electric resistance faces the stator with a prescribed gap therebetween.
In the aspect of the present invention, the member of small electric resistance provided on the rotor faces the stator with a prescribed gap therebetween, and thus an ergometer loading device which is adjusted easily and applies large braking force can be provided.
The foregoing and other objects, features, aspects and advantages of the present invention will become more apparent from the following detailed description of the present invention when taken in conjunction with the accompanying drawings.
REFERENCES:
patent: 4084810 (1978-04-01), Forsman
patent: 4398111 (1983-08-01), Zuch
patent: 4452445 (1984-06-01), Csekes
patent: 4517505 (1985-05-01), Cunningham
patent: 4713567 (1987-12-01), Fey et al.
patent: 4775145 (1988-10-01), Tsuyama
patent: 4800310 (1989-01-01), Nakao et al.
patent: 4853573 (1989-08-01), Wolcott et al.
patent: 5042794 (1991-08-01), Sun
patent: 5236069 (1993-08-01), Peng
patent: 5586624 (1996-12-01), Ko et al.
patent: 6084325 (2000-07-01), Hsu
patent: 6200426 (2001-03-01), Graf
patent: 673361 (1990-02-01), None
patent: 2221005 (1973-11-01), None
patent: 9210159.3 (1992-11-01), None
patent: 0193286 (1986-09-01), None
patent: 2275926 (1976-02-01), None
patent: 2242 075 (1991-09-01), None
patent: 1-25310 (1985-01-01), None
patent: 63-50952 (1985-01-01), None
patent: 2-45905 (1990-10-01), None
patent: 06-261494 (1994-09-01), None
Cateye Co. Ltd.
Olson & Hierl Ltd.
Waks Joseph
LandOfFree
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