WO2001099264A1

WO2001099264A1 - Electrical drive line

Info

Publication number: WO2001099264A1
Application number: PCT/GB2001/002731
Authority: WO
Inventors: Nour Eddin Ajan Alhadid
Original assignee: Rees, Alexander, Ellison
Priority date: 2000-06-20
Filing date: 2001-06-20
Publication date: 2001-12-27
Also published as: EP1293029A1; AU2001274287A1

Abstract

An electrical machine comprises an electric generator (6) having a mechanical power input shaft and an electric power output means and an electric motor (1) having an electric power input means and a mechanical power output shaft. The output shaft of the electric motor (1) is connected to drive the input shaft of the electric generator (6) through a gear assembly (5) comprising a first externally toothed gearwheel (5b) connected to the motor output shaft, a second internally toothed gearwheel (5c) coaxial with and surrounding the first gearwheel (5b) and connected to the generator input shaft and a number of third externally toothed gearwheels (5d) mounted for rotation between the first and second gearwheels (5b, 5c) so that rotation of the first gearwheel (5b) is transmitted to the third gearwheels and then transmitted to the second gearwheel (5c). The torque transmitted to the generator input shaft is greater than the torque on the motor output shaft and the electrical power output means of the electric generator (6) is arranged to supply electrical power to the electric power input means of the electric motor (1).

Description

ELECTRICAL DRIVE LINE

INVENTION IMPORTANCE

The main purpose of the invention is to save electric consumption and reduce the environmental pollution which became very important to find a solution for.

INVENTION AIM AND IDEA

Electrical generator is normally rotated by combustion engine to produce electrical power, so if we replace this engine by another one working by electricity, the result will be that the quantity of electricity used is greater than the one produced by the generator by the difference of loss and gain of both engines (generator and engine), but if we used the mechanical principle of the crane with a gear, torque of limited power on one side to produce relatively larger torque or power on the other side, in other words, to reduce the speed from high to low and what is known by the following mechanical formula:- 1

R = -- > 1 (1) n ^l2.

{R = Reduction ratio} {n, = Input speed } {n_a= Output speed }

When n_i is on the_.axle of the electric motor and n₂ on the axle of the generator, we have the power and mechanical torque as in the following formula: -

P (kw) = M (NM) n (R.P.MJ (2) 9550 ^• Υ

M (NM) = 9550 P (KW) (3)

N (R.P.M.)

{P = Rated Power} {M = Input Torque} n must equal the rotation of the generator. Practically, if we have electric motor (A.C.) with three phase with the following technique qualities:-

P = 5.5 (KW)

F = 50 Hz

Cos 0 = 0.88

Mechanical torque on the motor axle will be:-

M = P_ . 9550 -

N

M = 5,5_. . 9550 . 0.85 3000 = 14.9 (N.M.)

If we connect on the motor axle a gear box with R=2, the mechanical torque on the other side will be :-

= 29.7 (N.M.)

It is clear from this, we have greater output torque than input torque, and the increase ratio is as follows:-

29.7 - 14.9 . 100 = 99% 14.9

A preferred embodiment of the machine according to the invention will now be described by way of example only with reference to the accompanying Figure 1.

The machine provides the following parts:

1 A.C. Motor

2. Coupling

3 Flywheel

4 Rolling Bearing 5. Gear Box Assembly

6. Generator

7. First Shaft

8. Second Shaft

The motor 1 has an output shaft connected through a coupling 2 to a first shaft 7. A Flywheel 3 is mounted on the shaft 7. The shaft 7 is connected to drive a step down gearing assembly 5 and is mounted for rotation on bearings 4.

The step down gearing assembly 5 comprises a fixed member 5 a through which the shaft 7 passes. Preferably the fixed member 5a is a vertical plate. An externally toothed gearwheel 5b is mounted on the shaft 7 coaxial to the shaft 7. An internally toothed gearwheel 5c is mounted in the end of a second shaft 8 coaxial with the first shaft 7. The internally toothed gearwheel 5c is coaxial with the externally toothed gearwheel 5b and the two gearwheels 5b and 5c are sized to leave an annulus between them.

Four externally toothed geared rollers 5d are arranged equally spaced around the annulus between the externally toothed gearwheel 5b and the internally toothed gearwheel 5c. Each of the toothed rollers 5d is secured to the fixed plate 5a through a bearing for rotation about a fixed axis.

The teeth of the externally toothed gearwheel 5b, internally toothed gearwheel 5c and toothed rollers 5d intermesh so that rotation of the externally toothed gearwheel 5b drives the toothed rollers 5d which in turn drive the internally toothed gearwheel 5c.

The toothed surface of the internally toothed gearwheel 5c has more teeth than the toothed surface of the externally toothed gearwheel 5b so that the gearing arrangement 5 acts as a step down arrangement in which the first shaft 7 and second shaft 8 rotate in the same direction.

The second shaft 8 is connected to the input shaft of an electrical generator 6 through a coupling 2 and is mounted for rotation on a bearing 4. The relative sizes of the internally and externally toothed gearwheels 5c and 5b are arranged so that the output shaft to the motor 1 and first shaft 7 rotate at 1.42 times the speed of the second shaft 8 and input shaft of the generator 6. However, other reduction ratios are possible, such as the reduction ratio of 2 used in the calculated examples above.

Some of the electrical power output of the generator 6 can be supplied to the motor 1.

EXPLAINING THE FLY WHEEL:-

By installing the Flywheel in the machine, it will reduce the power in the motor machine that needs, and it is all according to the ability to the increase in the capacity of the motor. That is because it's mass absorbs movement power when rotating. When the machine has sudden power loading, the speed will slow down and at the same time, a quantity of moving power will be released and in turn, it changes to mechanical work that supports the original moving power. This power is calculated as follows where the machine incorporating the Flywheel has the following properties:-

{D = 0 4m, G = 37 Kg} {P A V A }

{n = 1500 (R P ) } (E = 220 - 380 }

{f = 50 Hz }

(Cos 0 = 0 8 }

W = Jn 1 82 {W = Moving power } {J = Moment of inertia}

J = G.D 4 {G = Flywheel mass } {D = Flywheel diameter}

= 40 . (0.37)

4 = 1.37 Kg.m

W = 1.37 . ( 150_0}² 182 = 16.9 KW. We can see that the stored movement power during the rotation of the Flywheel with a speed of 1500 R.P.M. is large and it is able to resist any sudden loading with the limitation of produce capacity and more, and we possible call the Flywheel as a Mechanical Power Factor Consumption.

It is preferred to place the Flywheel on the motor side of the gearing assembly in order to maximise the speed of rotation and amount of movement power stored in the Flywheel.

NOTE:-

To increase the ability of the machine we can use generators with low speeds or larger n and consequently the Reduction Ratio becomes larger, but to start the machine becomes more difficult because the volume of the generators, but we can solve this problem by technological additions e.g. adding an (inverter) which controls the frequency.

PRACTICAL APPLICATIONS :-

This machine would be used in all aspects and especially in areas where electrical power is consumed in a constant manner, for example in factories.

There is a great possibility to expand in the areas where savings are made with the use of several machines, graduated with the ability where the first one has small input and so on, until we reach our desired power we need, and in some cases it is possible to do this without the need to use mains power and replace it with batteries to work the machine.

Claims

Claims:

1. An electrical machine comprising an electric generator having a mechanical power input shaft and an electric power output means and an electric motor having an electric power input means and a mechanical power output shaft, in which the output shaft of the electric motor is connected to drive the input shaft of the electric generator through a gear assembly comprising a first externally toothed gearwheel connected to the motor output shaft, a second internally toothed gearwheel coaxial with and surrounding the first gearwheel and connected to the generator input shaft and a number of third externally toothed gearwheels mounted for rotation between the first and second gearwheels so that rotation of the first gearwheel is transmitted to the third gearwheels and then transmitted to the second gearwheel, and arranged such that the torque transmitted to the generator input shaft is greater than the torque on the motor output shaft and the electrical power output means of the electric generator is arranged to supply electrical power to the electric power input means of the electric motor.

2. An electrical machine according to claim 1, in which there are four third gearwheels spaced equidistantly around the first gearwheel.

3. An electrical machine according to claim 1 or claim 2, in which the torque transmitted to the generator input shaft is 1.5 times greater than the torque on the motor output shaft.

4. An electrical machine according to claim 3, in which the torque is 1.42 times greater.

5. An electrical machine according to any preceding claim, in which the machine is supplied with electric power through the electric power input means of the electric motor.

6. An electrical machine according to any preceding claim, further comprising a flywheel.

7. An electrical machine according to claim 6, in which the flywheel is mounted on the output shaft of the electric motor.