Electrical generator or motor structure – Dynamoelectric – Rotary
Patent
1989-11-08
1991-06-25
Stephan, Steven L.
Electrical generator or motor structure
Dynamoelectric
Rotary
310 90, 384514, 475196, H02K 5173, F16H 1306
Patent
active
050270230
DESCRIPTION:
BRIEF SUMMARY
This invention relates to a mechanical actuator and more specifically to an electric motor including a gear.
Electric motors and gears and combinations of them are frequently used as continuous drives, as well as actuators controlling the number of revolutions and the turning angle of an axis. The combination includes in this case also a number of sensors and control circuits.
The combinations known are assembled of generally available parts, such as dc- or ac-motors, various gearing and sensor units and units of control circuitry. The combinations include many bearings, shaft joints, various fitting joints and, cabling between units. Therefore using these kinds of combinations presents recurrent problems to their designers, especially because of the varying fixing means and measures. This also leads to difficulties in designing and mounting devices and machinery where these kinds of combinations are included. Moreover, the complicated design of prior art machinery leads frequently to complex implementations, when a rigid construction is desired. Therefore it is cumbersome and time consuming to use and service these kinds of devices, and in a process industry, this will lead to an essential burden on the profitability.
In the Finish patent No. 26230 a combination of a motor and a gear is described, where the gearing part may be exchanged in order to change the gear ratio. The device to be driven is connected to the shaft on the motor side. It is an object of the present invention to provide an improved and simpler construction unit including a motor and a reduction gear, the combination having a firm structure, allowing easy service and being suitable for numerous operating conditions.
According to the invention, a motor and a gear each known as such are combined in accordance with the characterizing part of claim 1.
The gear may for instance be a commercially available planet gear or friction gear, and due to the hollow input shaft it is possible to direct the output shaft through the input shaft. The output shaft is preferably carried in bearings at the ends of the box-like housing, and moreover in such a way that the other end of the shaft will form a flange-shaped cover of the gearing. Preferably the electric motor with the gear is built into a cylindrical housing concentrically with the shafts, although other shapes of the housing are possible.
The essential features of the invention are described in more detail in the claims. Preferred embodiments of the invention are described below with reference to the accompanying drawing, where:
FIG. 1 shows schematically a cross-section of a preferred embodiment of the electric motor including gear of the present invention;
FIG. 2, shows another embodiment of the invention; and
FIG. 3 is a further developed electric motor including gear, including a triple gear.
In FIG. 1 the fixed part 1 of the housing is fastened to the construction which supports the electric motor, including the gear, by retentions 17 on the periphery, which may be, e.g., screws. The fixed part of the gear is secured to the fixed part of the housing 1, and the output side of the gear is connected to the output flange 2 of the output shaft 20, the parts driven by the electric motor/gear being fastened (21) to the flange 2. The flange 2 is preferably made in one piece with the shaft 20.
The input shaft 15 is rotated by the rotor 7 of the motor, the rotor being secured to the shaft, the stator of the motor being secured to the removable part 13 of the housing. The input shaft 15 is carried in bearings of the housing 1 and of the flange-shaped cover 2 of the gearing. In order to provide the output shaft with a good stability, the output shaft is carried in bearing 3 of the end-flange near the periphery, and at the other end in bearing 4. To the removable part 13 of the housing is secured the stator 8 of the motor, sensors 9 and circuits 11 for control and operation according to the needs. Suitably the motor is a dc-motor, whose rotational direction and the amount as well as the rate of rotation
REFERENCES:
patent: 2101594 (1937-12-01), Pensbee
patent: 4617838 (1986-10-01), Anderson
patent: 4918344 (1990-04-01), Chikamori et al.
patent: 4928543 (1990-05-01), Johannesen et al.
Rebsch D. L.
Stephan Steven L.
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