Electrical generator or motor structure – Dynamoelectric – Rotary
Reexamination Certificate
2000-10-18
2001-12-25
Ramirez, Nestor (Department: 2834)
Electrical generator or motor structure
Dynamoelectric
Rotary
C310S100000, C310S099000, C310S098000, C310S078000, C310S083000
Reexamination Certificate
active
06333577
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an automotive AC dynamo-electric machine capable of bidirectionally transmitting motive power to and from an engine via a power transmission device, and also capable of starting the engine by implementing a motor operation mode and of supplying electric power to a vehicle by implementing a generator operation mode.
2. Description of the Related Art
FIG. 14
is a sectional view showing a conventional automotive AC dynamo-electric machine (hereinafter referred to as a “dynamo-electric machine”). The dynamo-electric machine includes a bracket
80
, a Lundell-type rotor
200
secured to a rotor shaft
12
provided in the bracket
80
, a stator
101
secured to an inner wall surface of the bracket
80
, a slip ring
15
secured to an end of the rotor shaft
12
and which supplies current to the rotor
200
, a pair of brushes
13
that slide on the surface of the slip ring
15
, and a brush holder
102
that accommodates the brushes
13
and springs
14
pressing the brushes
13
.
The rotor
200
has a field winding
11
that generates magnetic fluxes as current flows therethrough, and a rotor iron core
10
that covers the field winding
11
. The stator
101
has a stator iron core
1
through which the magnetic fluxes from the field winding
11
pass and which is composed of a plurality of layers of steel plates, and a three-phase stator winding
2
through which three-phase alternating current passes.
An operation of the dynamo-electric machine having the aforesaid construction will now be described.
When the engine is started, the dynamo-electric machine acts as a motor to supply AC current to the stator winding
2
. This generates torque in the rotor
200
, and the torque is transmitted to a V-belt (not shown) wound on a pulley
60
, which is a component of the power transmission device, thus starting the engine.
When electric power is supplied to a vehicle, the dynamo-electric machine acts as a generator. The power from an engine rotates the rotor
200
via the pulley
60
and the rotor shaft
12
. At this time, current is being supplied from a battery (not shown) to the field winding
11
of the rotor
200
via the brushes
13
and the slip ring
15
, and therefore magnetic fluxes are being generated. The rotation of the rotor
200
causes the magnetic fluxes to interlink the three-phase stator winding
2
, and an electromotive force is generated in the three-phase stator winding
2
, supplying electric power to the vehicle.
In the dynamo-electric machine having the construction set forth above, a pulley ratio (a ratio of an engine pulley diameter to a dynamo-electric machine pulley diameter) in the belt of the power transmission device is set to about 2 at maximum in order to prevent slippage of the belt and to secure a sufficient dimension of the pulley
60
for winding the belt around it so as to securely transmit the torque to the engine when starting the engine.
In the above dynamo-electric machine, a ratio of a number of revolutions of the dynamo-electric machine to a number of revolutions of the engine in both operation modes remains unchanged. When the pulley ratio is considered, in order to obtain adequate rotational output required for starting the engine, the dynamo-electric machine must be made larger because of an expression shown below, presenting a problem in that the dynamo-electric machine becomes too large to be mounted in a vehicle:
Rotational output (W) ∝(Outside dia. of rotor)
2
×Volume of stator iron core=Volume of dynamo-electric machine
SUMMARY OF THE INVENTION
Accordingly, the present invention has been made with a view toward solving the problem described above, and it is an object thereof to provide an automotive AC dynamo-electric machine capable of providing a sufficient rotational output for starting an engine by running a rotor at high speed in a motor operation mode for starting the engine, obviating the need for increasing a size thereof.
To this end, according to the present invention, there is provided an automotive AC dynamo-electric machine, wherein in the motor operation mode, the electromagnetic clutch follower connects to the electromagnetic clutch main body and also engages the cylindrical member to brake the cylindrical member, and the internal gear portion provides a fixed element, so that torque of the rotor is transmitted to the power transmission device via the rotor shaft, the sun gear, the planetary gear, and the carrier; and in the generator operation mode, the electromagnetic clutch follower disconnects from the electromagnetic clutch main body, and torque from the power transmission device is transmitted to the rotor via the carrier, the planetary gear shaft, the carrier support shaft, the one-way clutch, and the rotor shaft so as to rotate the rotor.
According to another aspect of the present invention, there is provided an automotive AC dynamo-electric machine, wherein in the motor operation mode, the electromagnetic clutch follower connects to the electromagnetic clutch main body and also engages the cylindrical member to brake the cylindrical member, and the internal gear portion provides a fixed element, so that torque of the rotor is transmitted to the power transmission device via the rotor shaft, the sun gear, the planetary gear, and the carrier; and in the generator operation mode, the electromagnetic clutch follower disconnects from the electromagnetic clutch main body, and torque from the power transmission device causes the carrier, the one-way clutch, the cylindrical member, the planetary gear, the sun gear, and the rotor shaft to rotate at the same rotational speed so as to rotate the rotor.
According to still another aspect of the present invention, there is provided an automotive AC dynamo-electric machine, wherein in the motor operation mode, the electromagnetic clutch follower connects to the electromagnetic clutch main body and also engages the cylindrical member to brake the cylindrical member, and the internal gear portion provides a fixed element, so that torque of the rotor is transmitted to the power transmission device via the rotor shaft, the sun gear, the planetary gear, and the carrier; and in the generator operation mode, the electromagnetic clutch follower disconnects from the electromagnetic clutch main body, and torque from the power transmission device causes the carrier, the one-way clutch, the sun gear, and the rotor shaft to rotate so as to rotate the rotor.
REFERENCES:
patent: 6184603 (2001-02-01), Hamai et al.
patent: 9-172753 (1997-06-01), None
Konishi Keiichi
Kusumoto Katsuhiko
Utsumi Yoshinobu
Yamamoto Tsunenobu
Mitsubishi Denki & Kabushiki Kaisha
Perez Guillermo
Ramirez Nestor
Sughrue & Mion, PLLC
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