FORM 2
THE PATENTS ACT, 1970
(39 of 1970)
&
THE PATENT RULES, 2003
COMPLETE SPECIFICATION
(See section 10 and rule 13)
TITLE OF THE INVENTION
A CMG SYSTEM INCLUDING ACCELERATION USING DRIVE MECHANISM
Applicant Name: Liger Mobility Private Limited
Applicant Address: A9 PEARL HEAVEN, CHAPEL ROAD BANDRA WEST,
MUMBAI MAHARASHTRA India 400050
Applicant Nationality: Indian
Inventor Name: ASHUTOSH UPADHYAY
Inventor Address: A1902 SHIMMERING HEIGHTS, NEAR POWAI VIHAR
COMPLEX, OPPOSITE CUSTOM'S COLONY POWAI, MUMBAI MAHARASHTRA
India 400076
Applicant Nationality: Indian
Inventor Name: VIKAS PODDAR
Inventor Address: A9 PEARL HEAVEN, CHAPEL ROAD BANDRA WEST, MUMBAI
MAHARASHTRA India 400050
Applicant Nationality: Indian
PREAMBLE OF THE DESCRIPTION
The following specification describes the invention and the manner in which it is to be
performed:

FIELD OF INVENTION [001] The present subject matter, in general, relates to control moment gyroscope(CMG) and more specifically, to spinning mechanism of the flywheel of the control moment gyroscope(CMG).
BACKGROUND OF INVENTION [002] Control Moment Gyroscopes can be used for Balancing and stabilization. Some
applications include roll stabilization of Yachts, Ships and Automobiles. [003] The control moment gyroscope (CMG) works as a spinning rotor at a constant speed.
It spins on the axis which is perpendicular to the spin axis. It consists of the motor-driven
rotor and one or more gimbals. The rate of change of angular momentum between the
CMG and the body is dependent on the spin velocity (gimbal velocity). When the motor
driven rotor tilts then the changing angular momentum causes a gyroscopic torque that
rotates the Yachts, Ships and Automobiles. [004] The CMG cannot be used for Balancing unless the Gyroscopes achieve a threshold
RPM (Revolutions per minute). The user needs to wait for the Spin up fast before the
CMG is usable. [005] For real life usage in consumer products, the spin time cannot be too long. In order to
reduce the Spin a time, the gyroscopes must use big motors and draw a surge of power.
The requirement for power generation makes the solution heavier, more complex and
more expensive. [006] There is therefore a need for a solution that helps overcome above problems at the
least.
OBJECTIVES OF THE INVENTION [007] The principal object of the embodiments herein is to provide a system which spins the
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control moment gyroscope (CMG) up at a faster rate without requiring a dedicated high-power mechanism of the size required to build up the initial threshold revolutions per minute.
[008] In one embodiment, the CMG may use a drive motor or drive engine to attain a required threshold. The gyroscopes or CMGs can be started spinning up at a faster rate by using a drive motor or drive engine without requiring a dedicated big motor for CMG specifically. CMGs are connected to the drive shaft through a clip. One end of the drive shaft is connected to the drive motor or drive engine.
[009] When the engine starts, the mechanical spin can be used to spin the flywheel of the CMG. In case there is more than one CMG, then the attached CMG/s start rotating in a clockwise direction and the counter CMG starts rotating in an anticlockwise direction unless the gyroscopes attain the required threshold velocity; after that the shaft that links the flywheel and the drive motor can be disengaged. In the disengaged position, small dedicated motors which are present in the CMG are used for maintaining the RPM (Revolution per minute) of CMG’s flywheel/s.
SUMMARY OF THE INVENTION [0010] Accordingly, the present invention provides a system for spinning control moment gyroscope (CMG) comprising:
a. at least one CMG;
b. a drive shaft connected with the at least one CMG;
c. a drive motor or drive engine connected to the drive shaft; and
d. a flywheel spin motor attached with the CMG.
[0011] In an embodiment, the present invention provides that the CMG ranges from one or two CMGs. In another embodiment, the present invention provides that the CMGs

comprises a motor for maintaining RPMs of the flywheel. In yet another embodiment, the present invention provides that the CMGs are connected to the drive shaft with a clip.
[0012] In further another embodiment, the present invention provides that each of a flywheel shaft of the CMG is engaged with the drive shaft with a mechanical means. In still another embodiment, the present invention provides that the mechanical means to engage each of the flywheel shaft of the CMG with the drive shaft comprises at least one gear, mounted on the drive shaft. In still another embodiment, the present invention provides that the drive motor or drive engine is connected to the one end of the drive shaft. Further, a control unit may be provided, configured to detect presence of a threshold spin velocity of the flywheel, and signal mechanical power disengagement of the drive actuator with the flywheel; and configured to detect presence of a spin velocity of the flywheel below threshold spin velocity, and signal mechanical power engagement of the drive actuator with the flywheel.
[0013] In one another embodiment, the present invention provides that the assembly of CMG with drive shaft is in an engaged position until the CMG attains a predefined velocity, else the drive is disengaged. In further another embodiment, the present invention provides that after the disengagement of the driven shaft with the CMGs, a flywheel spin motor attached with the CMG rotates maintains spin RPM of the CMG.
[0014] In still another embodiment, the present invention provides that the positioning of gears and shaft position is done via sensor.
[0015] Further, the present invention provides a method of CMG flywheel using mechanical power from the drive motor or drive engine, wherein the process comprises the steps of:
a. receiving instruction for the CMG to start;
b. starting of the drive engine or the drive motor;

c. engaging a drive shaft with a flywheel shaft of the CMG with at least a
mechanical means;
d. receiving mechanical energy from the drive engine or the drive motor for
rotating a flywheel;
e. achieving a threshold spin velocity for the flywheel;
f. disengaging of the drive motor or drive engine shaft from the flywheel shaft;
and
g. spinning the flywheel of the CMG with a flywheel spin motor.
[0016] In an embodiment, the present invention provides that upon engaging the drive shaft with the flywheel shaft of the CMG at least one CMG starts rotating in a clockwise direction and the other CMG starts rotating in an anticlockwise direction, unless the Gyroscopes achieve a threshold spin velocity. In yet another embodiment, the present invention provides that the method further comprises the steps of sensing of a threshold spin velocity of the flywheel sensing a point at which the threshold spin velocity has been achieved.
[0017] In still another embodiment, the present invention provides that the flywheel spin motor rotates in the disengaged position to maintain the spin velocity or spin RPM (Revolutions per minute) of CMGs. In further another embodiment, the present invention provides that the method comprises the steps of assessing if the CMG is switched on and assessing if the CMG is running above threshold value.
[0018] In one another embodiment, the present invention provides that if the CMG is running below a threshold, then engine drive is connected to CMG. In still another embodiment, the present invention provides that if the CMG is running above the threshold or including the threshold value, then disengaging the engine drive and starting

the flywheel spin motor.
BRIEF DESCRIPTION OF FIGURES
[0019] A clear understanding of the key features of the invention summarized below may be had by reference to the appended drawings, which illustrate the development of a CMG system with drive mechanism to spin up fast, although it will be understood that such drawings depict preferred embodiments herein and, therefore, are not to be considered as limiting its scope with regard to other embodiments which the invention is capable of contemplating. Accordingly:
[0020] Figure 1 illustrates an assembly of CMG with drive motor or drive engine in an engaged position, as per an embodiment herein.
[0021] Figure 2 illustrates an assembly of CMG with drive motor or drive engine in a disengaged position, as per an embodiment herein.
[0022] Figure 3 illustrates a method of CMG flywheel using mechanical power from the drive motor or drive engine, as per an embodiment herein.
DETAILED DESCRIPTION OF INVENTION [0023] The embodiments herein and the various features and advantageous details thereof are explained more fully with reference to the non-limiting embodiments that are illustrated in the accompanying drawings and detailed in the following description. Descriptions of well-known components and processing techniques are omitted so as to not unnecessarily obscure the embodiments herein. Also, the various embodiments described herein are not necessarily mutually exclusive, as some embodiments can be combined with one or more other embodiments to form new embodiments. The term “or” as used herein, refers to a non-exclusive or, unless otherwise indicated. As used herein, the term "and/or" includes any and all combinations of one or more of the associated

listed items. Expressions such as "at least one of," when preceding a list of elements, modify the entire list of elements and do not modify the individual elements of the list. The examples used herein are intended merely to facilitate an understanding of ways in which the embodiments herein can be practiced and to further enable those skilled in the art to practice the embodiments herein. Accordingly, the examples should not be construed as limiting the scope of the embodiments herein.
[0024] Further, embodiments may be described and illustrated in terms of blocks which carry out a described function or functions. These blocks, which may be referred to herein as units or modules or the like, are physically implemented by electronic devices such as mobile, laptop, mini-tablets, or the like, and may optionally be driven by firmware and software. The modules may, for example, be embodied in one or more electronic devices, or on any other communication devices and the like. The modules constituting a block may be implemented by dedicated hardware, or by a processor (e.g., one or more programmed microprocessors and associated circuitry), or by a combination of dedicated hardware to perform some functions of the block and a processor to perform other functions of the block. Each block of the embodiments may be physically separated into two or more interacting and discrete blocks without departing from the scope of the invention. Likewise, the blocks of the embodiments may be physically combined into more complex blocks without departing from the scope of the invention.
[0025] The accompanying drawings are used to help easily understand various technical features and it should be understood that the embodiments presented herein are not limited by the accompanying drawings. As such, the present disclosure should be construed to extend to any alterations, equivalents and substitutes in addition to those which are particularly set out in the accompanying drawings. Like numbers refer to like

elements throughout. Thus, the same or similar numbers may be described with reference to other drawings even if they are neither mentioned nor described in the corresponding drawing. Also, elements that are not denoted by reference numbers may be described with reference to other drawings. Although the terms first, second, etc. may be used herein to describe various elements, these elements should not be limited by these terms. These terms are generally only used to distinguish one element from another.
[0026] In describing the invention, it will be understood that a number of techniques and steps are disclosed. Each of these has individual benefits and each can also be used in conjunction with one or more, or in some cases all, of the other disclosed techniques. Accordingly, for the sake of clarity, this description will refrain from repeating every possible combination of the individual steps in an unnecessary fashion.
[0027] Various embodiments herein disclose a system which spins the control moment gyroscope’s (CMG) flywheel at a faster rate without requiring a dedicated high-power mechanism of the size required to build up the initial threshold revolutions per minute. Also, reference to the spinning of the CMG is used synonymously with spinning of the flywheel of the CMG, as may be understood by a person skilled in the art or otherwise as described herein.
[0028] The present invention includes; a. CMGs (Control Moment Gyroscope), that may be one or more in number, b. Shaft, c. A drive actuator, for example, Drive motor or Drive engine, d. Small dedicated motor which is attached with CMG. The CMG consists of a spinning rotor with a large, constant angular momentum, whose angular momentum vector direction can be changed by rotating the spinning rotor and one or more gimbals. The spinning rotor, which is on a gimbal, applies a torque to the gimbal to produce a precessional, gyroscopic reaction torque orthogonal to both the rotor spin and gimbal

axes. A CMG amplifies torque because a small gimbal torque input produces a large control torque to the two-wheeler.
[0029] The shaft is also called a drive shaft. Here two gears are mounted on a drive shaft. One gear is bigger in size and the other gear is smaller in size. Now two CMGs (Control Moment Gyroscope) are connected to a drive shaft with the help of a clip. Here the drive motor or drive engine is connected to the one end of a drive shaft. The drive engine/drive motor is used to compensate for the use of dedicated big motors for CMG specifically. Near to the engine, one CMG is connected with the drive shaft through a smaller gear. Another CMG is connected with the drive shaft through a bigger gear. Both of the CMGs consist of small motors which are used for maintaining the RPM (Revolutions per minute). After connecting with the drive engine or drive motor, CMG starts rotating in a clockwise direction and the drive shaft comes in the state of driven shaft; now another CMG which is on the opposite end starts rotating in an anticlockwise direction, unless the Gyroscopes achieve a threshold RPM. Here the Drive mechanism of Engine or Drive Motor, which is providing high torque Power for at least the duration of Spinning up of CMG in an engaged position. This assembly of CMG with drive shaft is called engaged position. Once the gyroscopes attain the required velocity, the drive can be disengaged. After the detachment of the driven shaft with the CMGs, the small motor keeps rotating and maintains the spin RPM of CMG.
[0030] Figure 1 of the present embodiment explains the assembly of CMG with the drive motor or engine in an engaged position. Here Drive shaft 101 is mounted with two gears. One is a bigger gear 102, and the other is a smaller gear 103. A drive motor or engine 104, which is connected to the one end of drive shaft 101. Two CMGs (Control moment gyroscope) are present, one is CMG 105 and the other one is CMG 106. CMG 105 is

connected to the drive shaft with the help of gear 103 and CMG 106 is connected to the drive shaft 101 through clip. Two gears are attached with the CMG 105 and one bigger gear is attached with the CMG 106. Here checking of proper positioning of gears and shaft position is done via sensor. A small motor 107 is present in the CMG 106 and motor 108 is present in the CMG 105 for maintaining the spin RPM of CMG. When the drive motor or engine 104 starts then the attached CMG 105 starts rotating in a clockwise direction and the other CMG 106 starts rotating in an anticlockwise direction unless the Gyroscopes achieve a threshold RPM in an engaged position.
[0031] A person skilled in the art will appreciate that the figure 1, represents the arrangement with two CMGs while the aspects of the invention may be practiced with one or more CMGs with related modifications. For example, in case of a single CMG the requirement of the gears set 103 that is directly driving the CMG 105 wouldn’t arise since CMG 105 wouldn’t be present.
[0032] Further, in one embodiment, the rotational power of spin motors maybe configured to be added to the rotational power provided by the drive actuator while the threshold spin velocity is still being pursued. Alternatively, in another embodiment, the rotational power of spin motors maybe configured to be used only when the threshold spin velocity is no longer being pursued.
[0033] Figure 2 of the present embodiment explains detachment of the CMG with the drive motor or engine. Here two CMGs 105 and 106 are disconnected from the drive shaft 101 which is connected to a drive motor or drive engine 104 at one end and through the clip at the other end. This position of CMG with the drive shaft is called disengaged position. In the disengaged position, the small motors which are present in the CMGs, are still rotating to maintain the spin RPM (Revolutions per minute) of CMGs.

[0034] An important aspect of this invention is the Drive mechanism such as Drive Engine or Drive Motor, which is capable of giving high torque/Power for at least the duration of Spinning up of CMG, mechanical clutches and electronic mechanism for engaging / disengaging the dedicated big motors for CMG at appropriate times, and the use of small motors for maintaining Spin RPM after the dedicated big motors for CMG is disengaged.
[0035] Figure 3 illustrates a method of CMG flywheel using mechanical power from the drive motor or drive engine, as per an embodiment herein. The method comprises receiving initiating instruction for the CMG to start. This might happen based on an initiation done by the user by switching on the vehicle. Alternatively, an automated/ computer operated instruction based on a preprogramming can cause the CMG to start. Steps also include starting of the drive engine/drive motor. Engaging of the drive shaft with the flywheel shaft using various mechanical means may be achieved. In one embodiment, these may be gears. Alternatively, other mechanical engagements may be used. Receiving mechanical energy from the drive engine/ drive motor for rotating the flywheel takes place. In one embodiment, a dedicated motor for flywheel may supplement the process by providing mechanical spin to supplement the drive motor/drive engine energy/spin. Sensing of a threshold spin velocity for the flywheel may repeatedly take place to sense a point at which the threshold spin velocity has been achieved. Disengaging of the drive motor/drive engine shaft from the flywheel shaft may then take place. The dedicated flywheel spin motor may then be used to support the continuance of spin for the flywheel.
[0036] In one embodiment, the method may comprise the steps of: checking if the CMG is switched on. Further step includes checking if the CMG is running above threshold value. If the CMG is running below the threshold, then connecting engine drive to CMG

may take place. If the CMG is running above the threshold (or including the threshold value) then disconnecting or not engaging of the engine drive, and starting of the spin motor (dedicated spin motor) may take place since the threshold has been achieved already.
[0037] This invention helps to solve the overhead cost of using big motors, and also provide suitable solutions for any application of CMG in roll stabilization of Yachts, Ships and Automobiles.
[0038] The foregoing description of the specific embodiments will so fully reveal the general nature of the embodiments herein that others can, by applying current knowledge, readily modify and/or adapt for various applications such specific embodiments without departing from the generic concept, and, therefore, such adaptations and modifications should and are intended to be comprehended within the meaning and range of equivalents of the disclosed embodiments. It is to be understood that the phraseology or terminology employed herein is for the purpose of description and not of limitation. Therefore, while the embodiments herein have been described in terms of preferred embodiments, those skilled in the art will recognize that the embodiments herein can be practiced with modification within the spirit and scope of the entire disclosure herein
[0039] The foregoing description of the specific embodiments will so fully reveal the general nature of the embodiments herein that others can, by applying current knowledge, readily modify and/or adapt for various applications such specific embodiments without departing from the generic concept, and, therefore, such adaptations and modifications should and are intended to be comprehended within the meaning and range of equivalents of the disclosed embodiments. It is to be understood that the phraseology or terminology employed herein is for the purpose of description and not of limitation. Therefore, while

the embodiments herein have been described in terms of preferred embodiments, those skilled in the art will recognize that the embodiments herein can be practiced with modification within the spirit and scope of the embodiments as described herein.

We Claim:
1. A system for spinning control moment gyroscope (CMG) comprising:
a. at least one CMG;
b.a mechanical means, connecting a drive shaft with the at least one CMG;
c. a drive actuator connected to the drive shaft; and
d. a flywheel spin motor attached with the CMG.
2. The system as claimed in claim 1, further comprising a control unit, configured to detect presence of a threshold spin velocity of the flywheel, and signal mechanical power disengagement of the drive actuator with the flywheel; and configured to detect presence of a spin velocity of the flywheel below threshold spin velocity, and signal mechanical power engagement of the drive actuator with the flywheel.
3. The system as claimed in claim 1, wherein the CMGs comprises a motor for maintaining RPMs of the flywheel.
4. The system as claimed in claim 1, wherein the CMGs are connected to the drive shaft with a clip.
5. The system as claimed in claim 1, wherein each of a flywheel shaft of the CMG is engaged with the drive shaft with a mechanical means.
6. The system as claimed in claim 1, wherein the mechanical means to engage each of the flywheel shaft of the CMG with the drive shaft comprises at least one gear, mounted on the drive shaft.
7. The system as claimed in claim 1, wherein the drive motor or drive engine is connected to the one end of the drive shaft.
8. The system as claimed in claim 1, wherein the assembly of CMG with drive shaft is in an engaged position until the CMG attains a predefined velocity, else the drive is disengaged.
9. The system as claimed in claim 1, wherein after the disengagement of the drive shaft with the CMGs, a flywheel spin motor attached with the CMG rotates maintaining spin RPM of the CMG.
10. The system as claimed in claim 1, wherein positioning of gears and shaft position is done via sensor.

11. A method of CMG flywheel using mechanical power from a drive actuator of a vehicle,
wherein the process comprises the steps of:
a. receiving instruction for the CMG to start;
b. starting of the drive engine or the drive motor;
c. engaging a drive shaft with a flywheel shaft of the CMG with at least a
mechanical means;
d. receiving mechanical energy from the drive engine or the drive motor for rotating
a flywheel;
e. achieving a threshold spin velocity for the flywheel;
f. disengaging of the drive motor or drive engine shaft from the flywheel shaft; and
g. spinning the flywheel of the CMG with a flywheel spin motor.
12. The method as claimed in claim 10, wherein upon engaging the drive shaft with the flywheel shaft of the CMG at least one CMG starts rotating in a clockwise direction and the other CMG starts rotating in an anticlockwise direction, unless the Gyroscopes achieve a threshold spin velocity.
13. The method as claimed in claim 11, wherein the method further comprises the steps of sensing of a threshold spin velocity of the flywheel sensing a point at which the threshold spin velocity has been achieved.
14. The method as claimed in claim 11, wherein the flywheel spin motor rotates in the disengaged position to maintain the spin velocity or spin RPM (Revolutions per minute) of CMGs.
15. The method as claimed in claim 11, wherein the method comprises the steps of assessing if the CMG is switched on and assessing if the CMG is running above threshold value.
16. The method as claimed in claim 14, wherein if the CMG is running below a threshold, then engine drive is connected to CMG.
17. The method as claimed in claim 14, further comprising the step of disengaging the engine drive and starting the flywheel spin motor, if the CMG is running above the threshold or including the threshold value.