COMPLATE AFTER PROVISIONAL
LEFT ON 30 OCT 2006
FORM 2

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THE PATENTS ACT, 1970
(39 of 1970)
& THE PATENTS RULES, 2003
COMPLETE SPECIFICATION
[See section 10, Rule 13]
A DEVICE FOR USING HORIZONTAL TRANSDUCER IN VERTICAL POSITION;
LARSEN & TOUBRO LIMITED, A COMPANY INCORPORATED UNDER THE COMPANIES ACT, 1956, WHOSE ADDRESS IS L&T HOUSE, BALLARD ESTATE, MUMBAI - 400 001, MAHARASHTRA, INDIA.
THE FOLLOWING SPECIFICATION
PARTICULARLY DESCRIBES THE
INVENTION AND THE MANNER IN WHICH IT IS TO BE PERFORMED.
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TECHNICAL FIELD
The present invention relates to a mounting arrangement, particularly to a mounting arrangement suitable for use in mounting flange-mounted motors in vertical position..
BACKGROUND ART
Generally, motors are classified into two types as foot mounted motors and flange mounted motors. Foot mounted motors are used in horizontal position and flange mounted motors are used in horizontal as well as vertical position.
The motors are generally tested after manufacturing and/or overhauling for various characteristics such as torque-speed, bearing temperatures, noise level, current and voltage generation in windings etc. before despatching them to the end user.
Typically, a magnetically or mechanically operated torque transducer is used to check the torque-speed characteristics of such motors. Mechanically operated transducers are less accurate and have various wear parts, which in long run deteriorate further that in wear and tear. Magnetically operated transducers are fairly accurate. As they work on Magnetism, they have few wear parts.
Magnetically operated torque transducers are designed in such a way that they can't take any axial load. In case of any axial load, these transducers result in erroneous reading of torque. Therefore, to avoid any kind of axial load such as self weight, they are used in horizontal positions only. Hence, at present, torque-speed characteristics of both Foot-mounted and Flange-mounted motors are tested in horizontal position.
However, for flange-mounted motors that are used in vertical position, this testing does not comply with actual working conditions. The testing devices and the arrangements for the mounting of flange-mounted motors may cater to few types of motors.
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The Flange mounted motors generally have a projection (26) on the flange (24) as shown in figure (4) for perfect alignment of the motors axis with the actual application. This projection varies from motor to motor. Conventionally ring type spacers, also called as Fishplates are used to take care of this projection while mounting the motor on the bed. However, each variety of motor demands a particular fishplate for mounting.
Further, flange (24) of flanged mounted motors is provided with number of holes (27) for clamping. These holes are placed on a certain Pitch Circle Diameter (PCD) at angles of 30°, 45°, 60°, 90°. Thus, the angular placement and the Pitch Circle Diameter of holes in different motors are different. Even in case of motors where the Pitch circle diameter is same, the angular placement of hole can be different. This makes the use of standard fishplates more difficult. Also, the base plate, where these motors will be mounted and clamped, should have arrangement for varied angular positions.
Hence, there is a need for a mounting arrangement for testing flange mounted motors in vertical condition. Therefore, there is need of a common arrangement to take care of different sizes of projection & the mounting holes on the flange. Further, there is a need for a mounting arrangement for testing flange motors in vertical condition.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide a mounting arrangement consisting of a base and a spacer device that enables loading of various flange-mounted motors, on a common base, in vertical position.
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Another object of the present invention to provide a mounting arrangement that enables flange-mounted motors to be tested in vertical position.
Another object of the invention is to provide a mounting arrangement in which a horizontal torque transducer is positioned vertically to test the flange-mounted motors in vertical position.
A mounting arrangement for flange-mounted motors in vertical position; said arrangement including a bottom frame; a mid plate adapted to mount a load motor vertically from bottom; a clamp mounted on the mid plate for fitting the transducer in a vertical position; and a top plate provided with slots to accommodate motor.Various types of motors varying in sizes may be accommodated with help of such arrangement. A bellows coupling is provided on both the sides of transducer and a flange coupling is mounted on the load motor for connecting the load motor and the bellows coupling. A shaft is provided above the transducer and connects the transducer to the test motor. The shaft is supported on an arrangement consisting of two deep groove ball bearings assembled in a bearing housing fixed to a bracket mounted on the mid plate thereby transferring the axial load of the test motor to the mid plate and not to the transducer; circular spacers used to mount variety of test motors in vertical position.
Thus, the mounting arrangement of the present invention enables the testing of flange mounted motors in vertical position using a horizontal magnetic transducer eliminating the inaccuracies caused due to axial load.
BRIEF DESCRIPTION OF THE DRAWINGS
Figure 1 shows the front view of the mounting arrangement of the present invention.
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Figure 2 shows the transducer and coupling arrangement between the load motor and test motor in according to one embodiment of the present invention.
Figure No. 3 shows the particulars of Transducer Assembly in front view of the complete assembly as per one embodiment of the present invention.
Figure 4 shows a flange mounted motor as per one embodiment of the present invention.
Figure 5 shows the mounting of the flange mounted test motor on the bottom plate using the spacer arrangement according to one embodiment of the present invention.
Figure no. 6 shows the details of the Spacer as per one embodiment of the present invention.
Figure no.7 shows the details of Top Plate as per one embodiment of the present invention.
DETAILED DESCRIPTION OF THE INVENTION
The mounting arrangement of the present invention is designed to test a gamut of flange-mounted motors in vertical position. The mounting arrangement enables testing a wide variety of flange mounted motors in vertical position and provides accurate results.
According to an embodiment of the present invention, the mounting arrangement has q bottom frame (1), a mid plate (3) and transducer arrangement (9) and a top plate (4) with mountings.
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As shown in figure 1, the bottom frame (1) is a rigid structure fabricated primarily from rectangular pipe. This frame is designed to take the entire load of the assembly and vibrations set up during the testing.
As shown in figure 2 , the mid plate (3) is adapted to mount a load motor (5) vertically from the bottom. The transducer assembly is mounted on the mid plate. In order to minimize the load transferred to the transducer, the transducer (11) is fitted to a clamp (9) and the clamp is then mounted on the mid plate (3) via bracket (6). Bellows couplings (10A and 10B) are provided on both the sides of the transducer. Flanged couplings (7 and8) are used to connect the load motor (5) to the bellows coupling (10B) on the bottom. The other end of this bellows coupling is connected to the transducer. The bellows coupling (10A), which is connected to the transducer on top, is connected to a shaft (13) with the help of a coupling plate (12). A circlip is provided in the shaft (13) that prevents even the load of the bellows (10A) & coupling plate (12) from acting on the transducer (11). The shaft (13) is supported on two deep groove ball bearings (14) assembled in housing (28) fixed on a bracket (6) mounted on the mid plate (3). A cardon shaft (16) is connected to the shaft (13) using a flanged coupling (15) as shown in figure 3.
The load of the cardon shaft (16) and the flanged couplings (15) is now transferred to the bearings (14) via shaft (13) and then finally to the housing (28), bracket (6) and mid plate (3). Thus, there minimum to no axial load acting on the transducer (11).
Further, the effect of various loads such as dynamic loads in addition to the static loads due to weight of various components, during actual testing are minimized. The dynamic load, due to misalignment, rotations and vibrations that acts on shaft (13), Cardon Shaft (16) & Bellows Coupling (10A and 10B), is also transferred to the mid plate (3) via Bearings (14), housing (28) and bracket (6).
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This arrangement thus protects the transducer from damage due to transfer of axial load.
The top plate on which the flange mounted motors are mounted is provided with a number of T-slots' oriented at different angles with respect to the centre of the top plate. These angles may be decided based on the various types of motor sizes. As per one embodiment the T-slots' are in steps of 30°, 45°, 60°, 90° to adjust different varieties of motors. Also since the slots are oriented from the centre to the periphery of the plate, motor of any Pitch-circle-diameter P.C.D can be arranged on the plate. These sizes of the T-slots and the orientation of the slots may be designed considering the different sizes of the flanged motors available in various standards such as for example, the Indian Standards (IS) for flange motors.
To avoid the projection in the flange of the motor to interfere with the mounting bed, we need to provide some spacers which can be interchangeable as well as which can accommodate different varieties of motors. Further, a spacer is provided between the flange (26) of the flange motor and the top plate (4). The spacer provided prevents interference of the projection in the flange of the motor with the mounting bed. These spacers provided are circular in shape and are provided with number of different sized holes at various angles. The different sized holes can accommodate different sizes of bolts and also these holes are so located that they provide maximum resting area to the flange of the motor. Thus, these spacers become a standard accessory for mounting different varieties of motor thus eliminating the use of fishplates.
Thus, the mounting arrangement of the present invention enables the testing of flange motors in vertical position on a standard mounting bed with the help of the spacers that eliminate the use of individual fishplates..
7

The top frame (2) is designed to take the load of the motor and top plate and the torsional load developed during the testing as shown in figure 1. The top plate, as shown in figure 7, is designed to take the load of the testing motor. The top plate is provided with slots to accommodate all varieties or make of motors as shown in figure 5 & 7.
According to another embodiment of the present invention a spacer device (20) is provided on the top plate (4). The spacer device (20) is a substantially circular body, as shown in figure (6), with holes of different sizes to accommodate different t-bolts (21) of motors, particularly flange motors. Figure (5) shows the top plate (3) with the spacer device (20). The flange motor (5) is mounted to the spacer device with the t-bolt (21) and nut (22) and a washer (23) as shown in figure (5).
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WE CLAIM
1. A mounting arrangement for flange-mounted motors in vertical position; said
arrangement comprising:
(a) a bottom frame;
(b) a mid plate adapted to mount a load motor vertically from bottom;
(c) a clamp mounted on the mid plate for fitting the transducer in a vertical position;
(d) a top plate provided with slots to accommodate motor.

2. A mounting arrangement for flange-mounted motors in vertical position as claimed in claim 1 wherein a bellows coupling is provided on both the sides of transducers.
3. A mounting arrangement for flange-mounted motors in vertical position as claimed in claim 1 or 2 wherein a flange coupling is mounted on the mid plate for connecting the load motor and the bellows coupling.
4. A mounting arrangement for flange-mounted motors in vertical position as claimed in claims'! ,2, or 3 wherein a shaft is provided above the transducer and connects the transducer to the test motor.
5. A mounting arrangement as claimed in claim 4 wherein the shaft is supported on an axial thrust bearing mounted on a bracket mounted on the mid plate.
6. A mounting arrangement as claimed in claim 4 or 5 wherein the transducer is connected to the shaft by a flange.
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7. A mounting arrangement as claimed in claims 4,5, or 6 wherein a cardon shaft is connected to the shaft in such a way that the load of the cardon shaft is transferred to the bracket mounted on the mid plate.
8. A mounting arrangement as claimed in claim 7 wherein the cardon shaft is connected by a flange to the shaft.
9. A mounting arrangement as claimed in any one of the preceding claims wherein a top frame is provided to take the load of the motor and the top plate and the torsional load developed during testing.
10. A mounting arrangement as claimed in any one of the preceding claims wherein the top plate is provided with multiple slots to accommodate motors.
11. A mounting arrangement as claimed in any one of the preceding claims wherein the slots of the top plate are T-slots.
12. A mounting arrangement as claimed in any one of the preceding claims wherein the top plate is provided with multiple slots at various angles with respect to the centre of the top plate.
13. A mounting arrangement comprising:

(a) (a) a bottom frame;
(b) a mid plate adapted to mount a load motor vertically from bottom;
(c) a load motor mounted on the mid plate;
(d) a transducer;
(e) a clamp mounted on the mid plate for fitting the transducer in a vertical position;
(f) a test motor accommodated on the top plate.
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14. A mounting arrangement as claimed in any one of the preceding claims comprising a spacer device for accommodating flange motor.
15. A spacer device for mounting a flange motor comprising a substantially circular body with holes of different size to accommodate different flange motors.
16. A mounting arrangement as described and illustrated in accompanying figures.
Dated this 28th day of October, 2005.
FOR LARSEN & TOUBRO LIMITED By their Agent

(GIRISH VIJAYANAND SHETH) KRISHNA & SAURASTRI

11

ABSTRACT
The present invention provides a mounting arrangement for flange-mounted motors in vertical position; said arrangement including a bottom frame; a mid plate adapted to mount a load motor vertically from bottom; a clamp mounted on the mid plate for fitting the transducer in a vertical position; and a top plate provided with slots to accommodate motor. A bellows coupling is provided on both the sides of transducers and a flange coupling is mounted on the mid plate for connecting the load motor and the bellows coupling. A shaft is provided above the transducer and connects the transducer to the test motor. The shaft is supported on an axial thrust bearing mounted on a bracket mounted on the mid plate thereby transferring the axial load of the test motor to the mid plate and not on the transducer.
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